Abstract
Osteosarcoma (OS) is the most common primary malignant bone tumor in children and adolescents, and is characterized by high heterogeneity, high malignancy, easy metastasis, and poor prognosis. Recurrence, metastasis, and multidrug resistance are the main problems that limit the therapeutic effect and prognosis of OS. PI3K/AKT/mTOR signaling pathway is often abnormally activated in OS tissues and cells, which promotes the rapid development, metastasis, and drug sensitivity of OS. Emerging evidence has revealed new insights into tumorigenesis through the interaction between the PI3K/AKT/mTOR pathway and non-coding RNAs (ncRNAs). Therefore, we reviewed the interactions between the PI3K/AKT/mTOR pathway and ncRNAs and their implication in OS. These interactions have the potential to serve as cancer biomarkers and therapeutic targets in clinical applications.
1 Introduction
In pediatric and adolescent populations, osteosarcoma (OS) is a primary malignant bone tumor that often arises in the metaphysis of the long bone [1]. The incidence of OS varies according to sex, age, and race. The annual incidence of OS is approximately three per million [2]. Clinically, adolescents aged 10–20 years are at high risk of OS. Studies have shown that people above the age of 50 years have the second highest OS-associated morbidity [3]. Approximately 15–20% of patients with OS are diagnosed with clinically detectable distant metastases, with over 85% of these metastases occurring in the lungs [4]. With the clinical application of neoadjuvant chemotherapy, the 5-year survival rate of patients with OS has increased to 70% [5]. However, the 5-year survival rate of OS patients with metastasis remains below 20% [6]. Currently, standard treatments for patients with OS are preoperative neoadjuvant chemotherapy, surgery, and postoperative adjuvant therapy [7]. However, the lack of targeted drugs is the clinical bottleneck of the treatment for the patients with OS [8]. The unknown etiology, recurrence, metastasis, multidrug resistance, and extensive histological specificity of OS obstructs the treatment procedure of patients with OS. Thus, it is urgent to study the pathogenesis and metastasis of OS.
Substantial evidence suggests that the imbalance of multiple signaling pathways is closely related to the progression of OS; while, PI3K/AKT/mTOR pathway plays a unique role in the progression and clinical treatment of OS [9]. The PI3K/AKT/mTOR signaling pathway plays a crucial role in promoting tumor cell proliferation, migration, epithelial–mesenchymal transition (EMT), inhibiting cell apoptosis, and increasing sensitivity to chemotherapy drugs [10]. Interestingly, the PI3K/AKT/mTOR signaling pathway is widely activated in the tissues and cells of OS. Overactivation of this pathway has oncogenic effects. Thus, PI3K/AKT/mTOR signaling inhibitors to block the activation of effector molecules and promote apoptosis have become a new idea for the clinical treatment of OS [11]. However, the biological functions and specific regulatory mechanisms of the PI3K/AKT/mTOR signaling pathway are poorly understood, and many problems still need to be further studied.
Some non-coding RNAs (ncRNAs) can act on certain steps of this pathway, regulating its activity and thereby affecting the progression of tumors [12,13]. These ncRNAs can generally be divided into two categories based on their effects on tumor cells. Those that are overexpressed in OS tissues, enhance tumor progression or drug resistance by promoting PI3K/Akt/mTOR pathway signaling; while, those that are downregulated in tumor tissues, inhibit tumor progression by inhibiting the PI3K/Akt/mTOR pathway. By studying the molecular mechanisms of various ncRNAs, we can explore the mechanisms of OS development, metastasis, or drug sensitivity. Based on this theoretical foundation, we reviewed the interactions between the PI3K/AKT/mTOR pathway and ncRNAs and their implication in OS. We hope these potential targets can be applied to clinical practice in the future.
2 PI3K/Akt/mTOR signaling pathway in oncology
2.1 Phosphatidylinositol 3 kinase (PI3K)
PI3K is categorized as a group of lipid kinases responsible for phosphorylating the 3ʹ-hydroxyl groups of phosphatidylinositol and phosphoinositide [14]. The primary product of this reaction is phosphatidylinositol-3,4,5-triphosphate (PIP3), which is a crucial secondary messenger. PIP3 helps Akt initiate signaling pathways associated with growth, proliferation, and cell survival [15]. According to its different structural features and substrate preference, PI3K is classified into three categories (Ⅰ–Ⅲ) [14]. Different types of PI3K serve various purposes in cell signal transduction, and their subtypes perform different tasks in cell signal transduction. Among all PI3Ks, class I PI3K molecules have been the most frequently studied because they are most closely related to cancer. Class I PI3K consists of a catalytic subunit (p110) weighing 110 kDa and a regulatory subunit (p85) that forms heterodimers [16]. Mammals produce four variants of the p110 isoform (the α, β, γ, and δ isoform) through different genes. Class I PI3K molecules can be found in all types of cells, with high concentrations of p110δ and p110γ in leukocytes [17]. Under basal conditions, the regulatory subunits interact with the p110 catalytic subunits, thereby securing PI3K protein heterodimers. This interaction not only inhibits kinase activity but also guides PI3K toward upstream regulators for activation [18]. Under physiological conditions, extracellular signals typically activate PI3K. Various stimuli can trigger PI3K activation. For example, growth factors such as epidermal growth factor (EGF), platelet-derived growth factor, and insulin-like growth factor (IGF-1) [19] adhere to the N-terminal extracellular region of their specific transmembrane receptor tyrosine kinases (RTKs). This binding leads to the autophosphorylation of tyrosine residues within the cytoplasmic regions of RTKs and associated linker molecules. Subsequently, PI3K is recruited to RTKs via the interface of p85 SH2 territories with phosphorylated tyrosine residues present in the components of the RTK complex. This interaction triggers the allosteric activation of PI3K [20]. In addition to RTKs, G protein-coupled receptors constitute another important class of traditional upstream regulators of PI3K activation. Additionally, small GTPases such as Ras and RAB5 can stimulate PI3K activation both directly and indirectly [19].
2.2 Protein kinase B (AKT)
Serine/threonine kinase AKT encompasses a family that includes AKT1, AKT2, and AKT3 in mammals and serves as a crucial mediator of PI3K signaling. To activate PI3K/AKT pathway, AKT and its upstream kinase, 3-phosphoinositide-dependent protein kinase-1 (PDK1) is required for inner cell membrane. This recruitment facilitates the phosphorylation of AKT at Thr308 in the provocation T-loop by PDK1 [21]. The regulatory hydrophobic domain of AKT contains a Ser473 site that can be phosphorylated by mTOR complex 2 (mTORC2) to achieve optimal activation [22]. Activated phosphorylated AKT subsequently moves out from the cellular membrane and phosphorylates numerous downstream substrates, thereby executing AKT functions [23].
2.3 Mammalian target of rapamycin (mTOR)
mTOR is a paramount protein found in various organisms, occupying a key position in the growth and metabolism of cells [24]. mTOR is a protein kinase belonging to the PI3K-related kinase (PIKK) family and is primarily associated with regulatory processes such as cell growth, division, metabolism, and survival [25]. mTOR functions are primarily mediated by mTORC1 and mTORC2, each of which exert different effects on cell physiology and metabolism [26]. mTORC1 predominantly regulates cell growth and metabolism by sensing nutritional and energy states and controlling protein synthesis, cell growth, autophagy, and lipid metabolism [27]. mTORC1 is also involved in responses to changes in oxygen and energy levels [28]. In contrast, mTORC2 is associated with cell survival and the organization of cellular cytoskeletal structures. mTORC2 is vital in insulin signal transduction, influencing lipid metabolism [29]. Disordered activation of the mTOR pathway has been implicated in various diseases, particularly cancers, metabolic disorders, and neurodegenerative diseases [30–32]. Consequently, inhibitors targeting the mTOR pathway, such as rapamycin and its derivatives, are used clinically as anticancer agents and immunomodulators [33]. In summary, mTOR is a fundamental element of cellular physiology and diseases that safeguards human health. Owing to its diverse roles in various diseases, the mTOR pathway has become a hotspot in drug development.
With the deepening of scientific research, the mechanisms of the PI3K/Akt/mTOR signaling pathway are gradually being understood. In human cells, activation of the PI3K pathway starts with RTKs, which are activated upon ligand binding and subsequently activate PI3K, initiating its activation. Activated-PI3K promotes the phosphorylation of phosphatidylinositol-4,5-bisphosphate (PIP2) to generate phosphatidylinositol-3,4,5-trisphosphate (PIP3). PIP3 attracts proteins with PH domains, including Akt. Upon recruitment to the cell membrane, Akt undergoes phosphorylation by PDK1 and mTORC1, becoming p-Akt. p-Akt can inhibit tuberous sclerosis complex 2 (TSC2), which in turn hydrolyzes Rheb-GTP to Rheb-GDP. Rheb-GTP, a GTPase, directly activates mTORC1. Through a series of actions, p-Akt promotes the activation of mTORC1, which then influences cellular activities directly through its own actions [23]. In patients with tumor, the PI3K/Akt/mTOR signaling pathway often exhibits overactivation [34], primarily due to dysregulation in the expression of PIK3CA and phosphatase and tensin homolog (PTEN). PIK3CA encodes p110α, and its increased expression can lead to overactivation of the PI3K pathway [35]. PTEN is a tumor suppressor gene that encodes a phosphatase capable of dephosphorylating PIP3 to PIP2, thereby inhibiting the PI3K pathway. In patients with OS, loss of the PTEN gene is common, which is an important mechanism leading to overactivation of the PI3K pathway [36].
3 Interaction of ncRNAs and the PI3K/AKT/mTOR pathway in oncology
ncRNAs do not possess the ability to directly translate into proteins. However, they serve as essential transcripts for regulating the expression of functional genes [37,38]. Based on their nucleotide length, ncRNAs are categorized into various species, mainly including miRNAs, lncRNAs, circRNAs, snRNAs, rRNAs, and tRNAs [39]. With the advancing research in epigenetics, the importance of ncRNAs has gradually been recognized. Experiments by Yu et al. demonstrated that miR-4524b-5p attenuates the progression of glioblastoma (GBM) by targeting aldehyde dehydrogenase ALDH1A3, thereby inhibiting proliferation and radio-resistance through the PI3K/AKT/mTOR signaling pathway [40]. MiR-4524b-5p acts as a targeted inhibitor of ALDH1A3, reducing tumor cell glycolysis and lowering the activation of the PI3K pathway, thus inhibiting GBM progression. Research by Gao et al. indicated that circ-NIRP1, overexpressed in biliary tract cancer (BTC), promotes carcinogenesis by competitively inhibiting miR-515-5p. This inhibition indirectly upregulates Akt2 and activates the PI3K/Akt/mTOR pathway, promoting BTC proliferation, EMT, and stemness [41]. Overall, the interactions between ncRNAs and signaling pathways are increasingly recognized. However, due to their diversity and complex connections, deciphering their associations presents challenges. Consequently, we summarized some common interactions between ncRNAs and the PI3K/AKT/mTOR pathway in OS. Multiple critical regulators originating from the PI3K/AKT/mTOR pathway inter-regulate and activate with ncRNA, resulting in their involvement in cancer progression. Alternatively, ncRNAs can mediate downstream targets to reciprocally affect the expression of key proteins through the PI3K/AKT/mTOR pathway. Therefore, additional discussions regarding the interaction between PI3K/AKT/mTOR and ncRNAs offer insights into the mechanism of malignant behavior in OS.
3.1 Long non-coding RNAs (lncRNAs) in oncology
The length of lncRNAs exceeds 200 base pairs, and studies have shown that they participate in the regulation of tumor growth and metastasis [42]. The expression of lncRNAs in the human body plays a crucial role in regulating cell replication cycles, apoptosis, and impacting cell proliferation and migration [37,43,44]. Aberrant expression of lncRNAs can disrupt these cellular processes, contributing to uncontrolled cell proliferation and migration, which are foundational to cancer development. Furthermore, lncRNAs are implicated in chemotherapy resistance; dysregulated expression is linked to reduced efficacy of chemotherapeutic drugs such as doxorubicin [45], and in another context, lncRNAs are associated with resistance in triple-negative breast cancer [46]. As research on lncRNAs advances, they are widely recognized as functional competitors of miRNAs, influencing cellular processes [47]. Researchers believe that developing clinical applications targeting lncRNA mechanisms is feasible. LncRNAs are considered potential targets for prostate cancer therapy [48], and similar studies are also emerging in OS research. LncRNA H19 is overexpressed in OS cells and shows substantial differences compared to its expression in normal cells. Knockdown experiments established that the expression grade of lncRNA H19 is positively correlated with distant metastasis in OS. LncRNA H19 further worsens the condition in patients with OS. LncRNA H19 promotes the phosphorylation of PI3K and Akt and affects the escalation of OS by activating the NF-κB pathway [49]. LncRNA00968 levels are higher in OS cells than in normal and can promote tumor cell survival and colony formation. Knockdown experiments have shown that lncRNA00968 can target and promote the PI3K/AKT/mTOR pathway by acting as an oncogene [50]. The level of lncRNA RUSC1-AS1 in OS cells was higher than that in human osteoblast cell lines. Gene knockout experiments confirmed that lncRNA RUSC1-AS1 enhanced the amplification and extension of OS cells and stimulated EMT. This effect may be achieved through direct targeting of miR-340-5p and indirect activation of the PI3K/Akt pathway [51]. In OS cells, lncRNA-p21 levels are lower. According to the cell growth curve and colony formation experiments, lncRNA-p21 had an inhibitory effect on tumor cells. Overexpression experiments demonstrated that lncRNA-p21 upregulated PTEN by targeting the oncogene miR-130b. Upregulation of PTEN inhibits Akt phosphorylation and suppresses Akt pathway signaling [52]. However, some lncRNAs have the opposite mechanism. In OS cells, LncRNA UCA1 shows upregulation. Luciferase and chromatin immunoprecipitation have shown that the upregulation of UCA1 may be related to hypoxia inducible factor-1 (HIF-1α). HIF-1α interlocks with the responded elements in the UCA1 promoter region, inducing UCA1 expression and downregulating PTEN, activating the Akt pathway, and inducing tumor cell growth [53]. Furthermore, there may be a carcinogenic pathway for UCA1. Through CREB1-mediated PI3K/Akt/mTOR signaling, UCA1 upregulates the expression of CREB1, competitively binds miR-582, and accelerates EMT pathway, thereby boosting tumor metastasis [54]. A positive feedback loop can be formed in OS cells when lncRNA TUG1 is elevated by FOXM1, which competitively absorbs miR-219a-5p. This triggers the Akt pathway, which in turn upregulate the expression of FOXM1, hence boosting the expression of TUG1 [55]. The lncRNA FER1L4 is downregulated in OS and constrains tumor occurrence. In FER1L4 overexpression experiments, a decrease in the expression of the amino acids Ser 470 and Thr 308 constituting p-Akt was detected, indicating that FER1L4 inhibits the phosphorylation of Akt. MiRNA-18a-5p is thought to be the target of lncRNA FER1L4, which suppresses miRNA-18a-5p to prevent the activation of the PI3K/AKT signaling pathway [56]. According to the research of Li et al., the lncRNA NNT-AS 1 is upregulated in OS tissues. Overexpression experiments have demonstrated that the lncRNA NNT-AS 1 can improve the capacity for invasion, proliferation, and lifespan of U2 OS cells, and the expression level of NNT-AS 1 is negatively correlated with miR-320a, suggesting that NNT-AS 1 may target miR-320a and downregulate its expression, thereby activating Akt and promoting progression of OS [57]. LncRNAs can also affect the prognosis of OS, and certain lncRNAs can be utilized as tumor markers in clinical applications. Compared with normal cell types, OS cell lines exhibit much greater expression of the recently identified oncogenic RNA lncRNA LOXL1-AS1. Functional studies have shown that LOXL1-AS1 knockout inhibits the PI3K/AKT pathway, which in turn prevents OS proliferation and invasion. Therefore, in the tissues of patients with OS, the high expression of LOXL1-AS1 plays the role of an oncogene and indicates a poor prognosis [58]. Jiang et al. [59] revealed a strong correlation between tumor size and metastasis in patients with OS and overexpression of lncRNA DANCR. The reason for this correlation is that DANCR binds to miR-33a-5p in a competitive manner, thereby increasing the expression of RTK AXL. This interaction influences the expression of downstream proteins in the PI3K/Akt pathway and affects various aspects of tumor cells, such as the self-renewal of CSC and EMT. Consequently, DANCR was deemed a self-sufficient prognostic element, indicating an unfavorable prognosis for patients with OS.
Similarly, the expression of the lncRNA ANRIL performs an essential function in the prognostic prediction of OS sufferers [60]. Experimental evidence has demonstrated that ANRIL expression in OS tissues is notably higher than that in adjoining non-cancerous tissues. ANRIL enhances the proliferation and invasion of OS cells, and its knockdown appreciably induces mobile apoptosis, confirming its association with a negative prognosis for OS. Specifically, this could also be due to a decrease in the phosphorylation tiers of PI3K and Akt after ANRIL knockdown, leading to subsequent signaling cascade reactions.
In addition to influencing the occurrence and prognosis of OS, lncRNAs affect the resistance of OS to chemotherapeutic drugs. The lncRNA OPI5-AS1 is upregulated in OS MG-63 and Sao-S 2 cells and regulates tumor cellphone resistance to cisplatin. Dual-luciferase reporter gene assays have located that lncRNA OPI5-AS1 can absorb miR-340-5p and regulate the goal lysophosphatidic acid acyltransferase β (LPAATβ) of miR-340-5p. LPAATβ can deactivate the PI3K/AKT pathway. In summary, lncRNA OPI5-AS1 may activate the PI3K/AKT pathway via focused on miR-340-5p to upregulate LPAATβ, improving tumor resistance to cisplatin [61].
In addition to cisplatin resistance, OS’s resistance in OS remains a serious issue. These results suggest that lncRNA PVT1 contributes to chemotherapy resistance in OS cells [62]. Comparative studies of cells overexpressing lncRNA PVT1 after gemcitabine treatment and lncRNA PVT1-depleted cells revealed that lncRNA PVT1 promoted proliferation and anti-apoptotic capabilities, whereas lncRNA PVT1 depletion intensified apoptotic tendencies. Subsequent experiments indicated that lncRNA PVT1 downregulates the levels of miR-152. Notably, lncRNA PVT1 induces the activation of the PI3K/Akt, an effect that can be counteracted by miR-152 and its mimic. This series of experimental results demonstrated that lncRNA PVT1 can activate the PI3K/Akt pathway by downregulating miR-152, thereby increasing OS resistance to gemcitabine.
In summary, the roles of lncRNAs in OS vary depending on their different mechanisms.
3.2 MicroRNAs (miRNAs) in oncology
miRNAs are a type of ncRNAs that are approximately 22 nucleotides long and are transcribed from endogenous genes. Their structure is single-stranded, and their primary role in organisms is to engage in post-transcriptional management of gene expression [63]. In recent years, as science and technology have progressed, there has been a growing recognition that the expression of miRNAs is associated with the occurrence of many cancers. miRNAs have the potential to feature either as tumor suppressors or promoters through the inhibition of oncogenes’ or tumor suppressor genes’ mRNA [64], respectively, and are also related to tumor metastasis and drug resistance [65]. Many studies have shown that miRNAs contribute to the pathogenesis of breast cancer [66], renal cancer [67], gastric cancer [68], thus attracting attention and OS. Qi et al. [69] employed a co-culture system comprising human bone marrow stem cells and OS cells to examine the effect of mesenchymal stem cells (MSC)-derived exosomes on OS cells. They found that these exosomes considerably promoted OS proliferation and invasion. Subsequent investigations unveiled an overexpression of miR-21-5p in MSC, targeting PIK3R1, which encodes the p85α subunit that regulates PI3K by binding to its p110 subunit. miR-21-5p initiates PI3K/Akt/mTOR signaling by inhibiting PIK3R1. Wang et al. [70] discovered that miR-384 was reduced in OS cell lines and functioned as a tumor suppressor gene. Overexpression of miR-384 significantly reduced the phosphorylation of PI3K and Akt, inhibited proliferation and invasion of MG63 cells, and accelerated apoptosis. Stem-loop binding protein (SLBP) is a target of miR-384, which regulates its expression. SLBP knockout undermined the tumor-promoting effect of miR-384 silencing in OS cell lines, indicating that downregulation of miR-384 promotes tumor growth by upregulating SLBP and activating the PI3K/Akt pathway. Qi et al. [71] found that miR-29a-3p was downregulated in OS cell lines. Overexpression of miR-29a-3p hinders the proliferation and invasion of OS cells and supports apoptosis and autophagy. Thus, it is considered a tumor suppressor. IGF1 activates the IGF1R/PI3K/Akt pathway to promote the occurrence and progression of OS. miR-29a-3p inhibits this phenomenon, thus exerting a tumor-suppressive effect. Liu et al. [72] discovered that overexpression of miR-342-5p substantially inhibited the proliferation and invasion of OS cells, enhanced apoptosis, and increased sensitivity to doxorubicin. Wnt7b is upregulated in OS cell lines and assists in tumor cell proliferation, possibly by activating mTOR C1 via PI3K/Akt. MiR-342-5p targets Wnt7b and inhibits its expression, thus serving as a tumor suppressor. Wang et al. [73] discovered that miR-485-3p was downregulated in OS cell lines. Dual-luciferase assays verified that miR-485-3p may want to directly bind to Akt3 mRNA, inhibiting the Akt/mTOR pathway in tumor cells, thus inhibiting cellular glycolysis, proliferation, and invasion, and acting as a tumor suppressor. Jin et al. [74] found that miR-1224-5p is downregulated in OS tissues. Overexpression of miR-1224-5p targets PLK1, reduces the phosphorylation of PI3K, Akt, and mTOR, and negatively regulates the PI3K/Akt/mTOR pathway, and inhibits tumor growth and EMT. Ru et al. [75] demonstrated that miR-564 was downregulated in patients with OS. Overexpression of miR-564 directly targets Akt, inhibits its transcription and translation, and suppresses tumor cell glycolysis, thereby inhibiting cell proliferation by reducing cellular activity. Xu et al. [76] demonstrated that the expression level of miR-149-5p was remarkably downregulated in OS. TNFRSF12A, also known as FN14, is a member of the tumor necrosis factor (TNF) receptor superfamily and a direct target of miR-149-5p. MiR-149-5p inhibited TNFRSF12A. TNFRSF12A, when bound to its ligand TNF-like weak inducer of apoptosis (TWEAK), can activate multiple signaling pathways, thereby affecting the tumor microenvironment and promoting tumor cell survival and migration. MiR-149-5p inhibits the PI3K/Akt pathway by suppressing TNFRSF12A. Liu et al. [77] showed that heat shock protein 90 (HSP90) can stabilize the phosphorylation state of Akt, and miR-485-5p can target both HSP90 and Akt, inhibiting Akt’s translation and phosphorylation, thereby inhibiting the pathway and OS progression.
Some miRNAs also possess a function similar to that of lncRNAs, affecting chemotherapy resistance in OS. Meng et al. [78] indicate the engagement of miRNA-22 in the evolution of cisplatin resistance. miR-22 was shown to inhibit the proliferation of MG63/CDDP cells both in vitro and in vivo, thereby enhancing their resistance to cisplatin-induced proliferation. miR-22 can reduce the translation and phosphorylation of PI3K, Akt, and mTOR, thereby decreasing cisplatin-induced autophagy. However, miR-22 also promotes apoptosis in tumor cells and enhances their sensitivity to cisplatin.
In summary, current research on the relationship between miRNAs and tumors continues to deepen.
3.3 Circular RNAs (circRNAs) in oncology
circRNAs were discovered in 1976, formed by precursor mRNA by means of back-splicing, connecting the 3ʹ splice web page to the 5ʹ splice site [79]. With recent advances in research, circRNAs have been recognized to possess unique effects on malignant tumors. circRNAs exhibit varied expression patterns across diseases and contribute to the pathogenesis of these conditions [80]. Li et al. [81] indicated that hsa-circ-0006101 (commonly recognized as circ-ORC2) is upregulated in the cytoplasm of OS cells and orchestrates miR-19a expression through direct binding. miR-19a negatively regulates its downstream target PTEN. PTEN downregulation weakens the inhibition of Akt phosphorylation, activates PI3K/Akt, and promotes the proliferation and invasion of OS. Similarly, Liu et al. [82] illustrated that circROCK1 expression is lower in OS and sponges miR-532-5P, causing its expression to decrease. Conversely, downregulation of miR-532-5P promotes PTEN expression, playing a cancer-suppressive role through a similar mechanism. Li et al. [83] demonstrated that silencing circ-0001785 leads to the downregulation of the phosphorylated forms of the three proteins PI3K, Akt, and mTOR, with little change in their total expression, suggesting that circ-0001785 can directly inhibit the phosphorylation of PI3K, Akt, and mTOR, thus suppressing the activity of the PI3K/Akt/mTOR pathway and affecting apoptosis. In accordance with a study by Yang et al. [84], circ-001422 was found to be increased in OS cells and directly sponge miR-195-5p, leading to the upregulation of its downstream target fibroblast growth factor 2 (FGF2), activation of the PI3K/Akt pathway, and promotion of cancer progression while inhibiting apoptosis. Zhang et al. [85] showed that silencing circRNA-CIRH1A significantly increased the level of miR-1276, damaging the activation of the PI3K/Akt pathway and limiting the proliferation of U20 and MG63 cells. Liu et al. indicated that circRNA-103801 is increased in OS cell lines and is involved in the PI3K/Akt pathway, thereby affecting the growth abilities of OS [86]. Li and Li showed that hsa-circ-0007534 in OS can enhance the phosphorylation of Akt and the subsequent activation of cell signaling pathways [87]. Shi et al. reported that circRNA-NIRP1 is upregulated in OS and competitively binds to miR-532-3p to upregulate Akt3, thus enhancing the activity of the PI3K/Akt pathway and strengthening the malignancy of OS [88]. Hao et al. reported that the overexpression of circRNA-0088214 could inhibit the phosphorylation of Akt to suppress the PI3K/Akt pathway, thereby to cisplatin resistance and promoting apoptosis [89]. Zhang et al. confirmed that hsa-circ-0005909 is upregulated in tumor cells and acts as a molecular sponge for miR-338-3p, reducing its expression compared to that in adjacent cancer tissues. HGMA1, an oncogene that encodes a protein that recognizes and binds continuous A–T base pairs, is involved in gene expression regulation, and is a target of miR-338-3p. The downregulation of miR-338-3p inversely affects the expression of HGMA1. Upregulation of HGMA1 activates the PI3K/Akt pathway, which affects tumor progression [90]. In summary, circRNAs mainly affect tumor cells by sponging miRNAs and sometimes directly influence the phosphorylation of signaling molecules. Further research on this mechanism may provide new insights into the pathogenesis and therapeutic concepts of OS.
3.4 Small interfering RNA (siRNAs) in oncology
siRNAs are nucleic acids whose primary role in the body is to degrade target genes via RNA interference. As our understanding of siRNAs deepens, the mechanism of siRNA is thought to be applicable to the treatment of tumors. Hu et al. [91] suggested that siRNAs can silence related oncogenes or cancer-promoting regulatory genes in a sequence-specific manner, thereby reducing the probability of tumor occurrence. Furthermore, studies by Kara et al. [92] proposed that siRNAs can also be used to treat existing cancers or serve as delivery vehicles for certain targeted anti-tumor drugs. Nanotherapy has a vast potential for development. However, surgery combined with adjuvant radiotherapy and chemotherapy remains the primary approach for treating OS. siRNA is a hot field today, and as our understanding deepens, researchers will have updated insights into tumor treatment.
To provide a more visual representation of the role of the PI3K/Akt/mTOR pathway and ncRNAs in OS, the relationship is summarized. Figure 1 summarizes the impact of the PI3K/Akt/mTOR pathway and ncRNAs on the progression of OS. Three types of ncRNAs exert varying effects on tumor proliferation, metastasis, and other biological behaviors by interacting with the PI3K/Akt/mTOR pathway, ultimately impacting patients with OS on a macroscopic scale. Figure 2 summarizes the roles of various RNAs discussed in this study. Tables 1 and 2 further show the target mechanisms and action proteins of different ncRNAs, compiled from respective referenced literature sources. Figures 1 and 2 were made by the authors using the Biorender (https://app.biorender.com/).

Mechanism of PI3K/Akt/mTOR pathway in OS.

Interactions between the PI3K/AKT/mTOR pathway and ncRNAs in OS.
ncRNAs acted as oncogenes in OS
ncRNAs | Targets | Biological function | Ref. |
---|---|---|---|
lncRNA H19 | NF-κB pathway | Promotes migration and invasion | [49] |
lncRNA MIAT | miR-141-3p/SIX1 | Promotes tumor development | [93] |
lncRNA HOTAIR | miR-6888-3p/SYK | Promotes the proliferation and migration | [94] |
lncRNA 00968 | / | Promotes cell survival and colony formation | [50] |
lncRNA RUSC1-AS1 | miR-340-5p | Promotes the progression and EMT both in vitro and in vivo | [51] |
lncRNA MSC-AS1 | miR-142/CDK6 | Promotes OS progression and sensitivity to cisplatin | [95] |
lncRNA UCA1 | HIF-1α/PTEN | Promotes cell growth | [53] |
miR-582/CREB1 | Promotes EMT and metastasis | [54] | |
lncRNA TUG1 | miR-219a-5p/FOXM1 | Accelerated OS proliferation, migration, and invasion | [55] |
lncRNA NNT-AS1 | miR-320a | Enhance the continuation of U2 OS and prolong the life span of tumor cells | [57] |
lncRNA OPI5-AS1 | miR-340-5p/LPAATβ | Causes cisplatin resistance in OS | [61] |
lncRNA LOXL1-AS1 | / | Promotes cell proliferation, migration, and invasion | [58] |
lncRNA DNACR | miR-33a-5p/AXL | Promotes tumor progression and cancer stemness features | [59] |
lncRNA ANRIL | / | Accelerates the tumor development | [60] |
lncRNA PVT1 | miR-152/c-MET | Enhance chemoresistance of OS to gemcitabine | [62] |
LncRNA DBH-AS1 | Promotes cell proliferation, migration and invasion, and inhibits apoptosis in OS | [96] | |
LncRNA01060 | / | Promotes OS cell malignant behaviors, hyperproliferation, invasion, migration, and EMT | [97] |
miR-17 | SASH1 | Promotes OS cells proliferation, migration, and inhibits apoptosis | [98] |
miR-21 | PTEN | Promotes proliferation and inhibits apoptosis | [99] |
miR-22 | PI3K/Akt/mTOR | Enhanced the anti‑proliferative ability of CDDP in vivo and in vitro | [78] |
miR-21-5p | PIK3R1 | Promote OS cell proliferation and invasion | [69] |
miR-23b-3p | VEPH1 | Accelerated the tumor development | [100] |
miR-106b | Promote proliferation and invasion | [101] | |
miR-373 | p53 | Promotes growth and cellular invasion in OS cells | [102] |
miR-802 | p27 | Promoted the progress of EMT, migration, and invasion | [103] |
miR-221 | PTEN | Induces cell survival and cisplatin resistance | [104] |
miR-196a | Promotes cell proliferation and inhibits cell apoptosis | [105] | |
miR-200c | CDH1 | Promotes the progression and metastasis | [106] |
circRNA-ORC2 | miR-19a/PTEN | Promotes OS cell growth and invasion | [81] |
circRNA-0001785 | miR-1200/HOXB2 | Promotes proliferative ability, inhibits the apoptosis of OS cells | [83] |
circRNA-001422 | miR-195-5p/FGF2 | Promotes tumor proliferation and metastasis, and inhibits apoptosis | [84] |
circRNA-CIRH1A | miR-1276 | Promotes the proliferation, invasion, migration | [85] |
circRNA-103801 | / | Accelerates the development of OS | [86] |
miR-338-3p, HIF-1/Rap1 | Accelerates proliferation | [107] | |
circRNA-0007534 | AKT/GSK-3β | Promotes cell growth and inhibits apoptosis | [87] |
circRNA-NIRP1 | miR-532-3p/PI3K/AKT | Promotes the malignant degree of OS | [88] |
circRNA-0005909 | miR-338-3p/HGMA1 | Promotes the OS progression | [90] |
ncRNAs acted as tumor suppressors in OS
ncRNAs | Targets | Biological function | Ref. |
---|---|---|---|
lncRNA p21 | miR-130b/PTEN | Inhibits OS cell growth and colony formation | [52] |
lncRNA FER1L4 | miR-18a-5p | Promotes apoptosis and inhibited the EMT | [56] |
/ | Promotes apoptosis and suppresses EMT and stemness markers | [108] | |
lncRNA GASL1 | Inhibits proliferation and invasion of OS cells | [109] | |
lncRNA GAS5 | miR-23a-3p | Suppresses the proliferation and invasion | [110] |
lncRNA 00619 | HGF | Inhibits proliferation, migration, and invasion and improves apoptosis of OS cells | [111] |
lncRNA 00628 | Inhibited the proliferation, invasion, and migration and promoted cell apoptosis | [112] | |
miR-384 | SLBP | Inhibits the growth and metastasis | [70] |
miR-340-5p | NRF2 | Inhibits the malignant phenotypes of OS | [113] |
miR-29a-3p | IGF1 | Repressed the OS evolvement through inducing autophagy | [71] |
miR-29b | Spin 1 | Represses OS cell self-renewal, differentiation, and drug resistance | [114] |
miR-342-5p | Wnt7b | Inhibits OS cell growth, migration, invasion, and sensitivity to doxorubicin | [72] |
miR-485-3p | c-MET, AKT3/mTOR | Inhibits OS glycolysis and metastasis | [73] |
HSP90/AKT1 | Suppress OS cell proliferation and migration | [77] | |
miR-1224-5p | PLK1 | Inhibits the proliferation, invasion, and EMT | [74] |
miR-564 | Akt | Inhibits the proliferation | [75] |
miR-149-5p | TWEAK/Fn14 | Inhibit the survival and migration of tumor cells | [76] |
miR-122-5p | TP53 | Inhibits the proliferation and promote the apoptosis of OS cells | [115] |
miR-497 | Inhibits cell survival and enhanced the sensitivity to cisplatin | [116] | |
miR-449a | EZH2 | Inhibits cell proliferation, invasion, and migration | [117] |
miR-520d-3p | MIG-7 | Inhibits vasculogenic mimicry formation and metastasis | [118] |
miR-100 | IGFIR | Inhibits OS cell proliferation, migration, and invasion and enhances chemosensitivity | [119] |
miR-206 | PAX3/MET | Reduces OS cell malignancy in vitro | [120] |
miR-375 | PIK3CA | Inhibits the tumorigenesis | [121] |
miR-146b-5p | TRAF6 | Inhibits the proliferation | [122] |
miR-223 | Hsp90B1 | Inhibits the cell growth | [114] |
miR-16-5p | TSPAN15 | Inhibits the proliferation, migration, and invasion | [123] |
circRNA-ROCK1 | miR-532-5p/PTEN | Suppresses OS proliferation and migration | [82] |
circRNA-0088214 | AKT | Suppresses tumor progression | [89] |
4 Discussion and perspectives
OS is the most common primary malignant tumor of the bone and soft tissue, garnering considerable attention due to its high tumor heterogeneity, poor prognosis, and lung metastasis. Currently, surgery and chemotherapy are the main treatment strategy for patients with OS. However, the lack of targeted drugs is the clinical bottleneck of the treatment for the patients with OS. Thus, there is a need urgent to study the pathogenesis and metastasis of OS. As one of the important signal transduction pathways in tumor cells, PI3K/AKT/mTOR signaling pathway plays an important role in the development and drug sensitivity of OS, with functions such as accelerating cell cycle, promoting cell proliferation, invasion and metastasis, and enhancing drug sensitivity.
Increasing evidence suggests that ncRNAs can regulate the PI3K/Akt/mTOR signaling pathway in OS. This pathway influences tumor progression and may exacerbate chemotherapy resistance. Numerous ncRNAs in OS tissues have the capability of promoting or inhibiting the activation of the PI3K/Akt/mTOR pathway. This study reviews the interactions between various ncRNAs and the PI3K/Akt/mTOR pathway and discovers new applications of ncRNAs based on their effects on this pathway. We categorize ncRNAs that regulate signaling pathways into two types. Some RNAs are upregulated in OS tissues, indicating their oncogenic potential. These ncRNAs activate the PI3K/Akt/mTOR pathway, promoting cancer cell proliferation, invasion, inhibiting apoptosis, and enhancing drug resistance. Conversely, other ncRNAs are downregulated in OS tissues, exerting opposite effects to inhibit tumor progression. Therefore, we can utilize these molecular mechanisms to predict the prognosis of OS by measuring the expression levels and trends of RNA or PI3K/Akt pathway molecules in vivo. As described, taking lncRNA LOXL1-AS1 as an example, its upregulation in OS tissues has oncogenic effects. Thus, clinically measuring the expression level of lncRNA LOXL1-AS1, if found to be elevated above normal levels, indicates a potentially poorer prognosis for the patient. With further research, more ncRNAs with similar functions will likely be discovered, expanding our options for diagnosing diseases and predicting prognosis more accurately.
Many key proteins in the PI3K/AKT/mTOR signaling pathway are also important targets for drug design, and the study of small molecule inhibitors has also made great progress. Many drug candidates have entered clinical studies, including PI3K inhibitors, AKT inhibitors, and dual PI3K/mTOR inhibitors. Researchers have proposed a nanocarrier for targeted delivery of ncRNAs for gene therapy. This nanocarrier exhibits low cytotoxicity and effective intracellular transmission in tumor cells. For example, the results of some researchers suggest that delivery of miR-22 targeting the PI3K/Akt pathway has good anti-tumor activity [124]. However, applying theoretical concepts to clinical practice faces several challenges. First, RNA expression involves complex mechanisms and whether clinical interventions can adjust RNA expression to affect pathway activation remains unclear. Second, each patient with OS may have different genes with abnormal expression genes, posing difficulties in whether such carriers can deliver other types of RNAs and how therapeutic nucleic acids can be obtained. Third, the cost-effectiveness of this treatment method is a concern. Whether costs can be controlled and reduced determines its feasibility for widespread implementation globally, which needs careful consideration.
Therefore, further understanding of the function and molecular mechanism of the interaction of PI3K/AKT/mTOR signaling pathway and ncRNAs is of great significance for finding new therapeutic approaches and potential targets for OS, and ultimately improving the prognosis of patients with OS.
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Funding information: This work was financially funded by the National Science Foundation of China (No. 81960488), The Science Foundation of Yunnan Province (No. 202201AT070012), and The Science and Technology Innovation Team Training Project of Kunming Medical University (No. CXTD202212).
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Author contributions: Y.Z. and Y.Z. designed the framework of the manuscript; S.W., F.Y., L.T., and G.S. wrote the manuscript and participated in the revision. H.J., Y.Y., and L.D. checked the related literature. All authors reviewed the final version and agreed to its submission. All authors have read and agreed to the published version of the manuscript.
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Conflict of interest: Authors state no conflict of interest.
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Data availability statement: Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.
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- Retraction to “MiR-223-3p regulates cell viability, migration, invasion, and apoptosis of non-small cell lung cancer cells by targeting RHOB”
- Retraction to “A data mining technique for detecting malignant mesothelioma cancer using multiple regression analysis”
- Special Issue on Advances in Neurodegenerative Disease Research and Treatment
- Transplantation of human neural stem cell prevents symptomatic motor behavior disability in a rat model of Parkinson’s disease
- Special Issue on Multi-omics
- Inflammasome complex genes with clinical relevance suggest potential as therapeutic targets for anti-tumor drugs in clear cell renal cell carcinoma
- Gastroesophageal varices in primary biliary cholangitis with anti-centromere antibody positivity: Early onset?
Articles in the same Issue
- Biomedical Sciences
- Constitutive and evoked release of ATP in adult mouse olfactory epithelium
- LARP1 knockdown inhibits cultured gastric carcinoma cell cycle progression and metastatic behavior
- PEGylated porcine–human recombinant uricase: A novel fusion protein with improved efficacy and safety for the treatment of hyperuricemia and renal complications
- Research progress on ocular complications caused by type 2 diabetes mellitus and the function of tears and blepharons
- The role and mechanism of esketamine in preventing and treating remifentanil-induced hyperalgesia based on the NMDA receptor–CaMKII pathway
- Brucella infection combined with Nocardia infection: A case report and literature review
- Detection of serum interleukin-18 level and neutrophil/lymphocyte ratio in patients with antineutrophil cytoplasmic antibody-associated vasculitis and its clinical significance
- Ang-1, Ang-2, and Tie2 are diagnostic biomarkers for Henoch-Schönlein purpura and pediatric-onset systemic lupus erythematous
- PTTG1 induces pancreatic cancer cell proliferation and promotes aerobic glycolysis by regulating c-myc
- Role of serum B-cell-activating factor and interleukin-17 as biomarkers in the classification of interstitial pneumonia with autoimmune features
- Effectiveness and safety of a mumps containing vaccine in preventing laboratory-confirmed mumps cases from 2002 to 2017: A meta-analysis
- Low levels of sex hormone-binding globulin predict an increased breast cancer risk and its underlying molecular mechanisms
- A case of Trousseau syndrome: Screening, detection and complication
- Application of the integrated airway humidification device enhances the humidification effect of the rabbit tracheotomy model
- Preparation of Cu2+/TA/HAP composite coating with anti-bacterial and osteogenic potential on 3D-printed porous Ti alloy scaffolds for orthopedic applications
- Aquaporin-8 promotes human dermal fibroblasts to counteract hydrogen peroxide-induced oxidative damage: A novel target for management of skin aging
- Current research and evidence gaps on placental development in iron deficiency anemia
- Single-nucleotide polymorphism rs2910829 in PDE4D is related to stroke susceptibility in Chinese populations: The results of a meta-analysis
- Pheochromocytoma-induced myocardial infarction: A case report
- Kaempferol regulates apoptosis and migration of neural stem cells to attenuate cerebral infarction by O‐GlcNAcylation of β-catenin
- Sirtuin 5 regulates acute myeloid leukemia cell viability and apoptosis by succinylation modification of glycine decarboxylase
- Apigenin 7-glucoside impedes hypoxia-induced malignant phenotypes of cervical cancer cells in a p16-dependent manner
- KAT2A changes the function of endometrial stromal cells via regulating the succinylation of ENO1
- Current state of research on copper complexes in the treatment of breast cancer
- Exploring antioxidant strategies in the pathogenesis of ALS
- Helicobacter pylori causes gastric dysbacteriosis in chronic gastritis patients
- IL-33/soluble ST2 axis is associated with radiation-induced cardiac injury
- The predictive value of serum NLR, SII, and OPNI for lymph node metastasis in breast cancer patients with internal mammary lymph nodes after thoracoscopic surgery
- Carrying SNP rs17506395 (T > G) in TP63 gene and CCR5Δ32 mutation associated with the occurrence of breast cancer in Burkina Faso
- P2X7 receptor: A receptor closely linked with sepsis-associated encephalopathy
- Probiotics for inflammatory bowel disease: Is there sufficient evidence?
- Identification of KDM4C as a gene conferring drug resistance in multiple myeloma
- Microbial perspective on the skin–gut axis and atopic dermatitis
- Thymosin α1 combined with XELOX improves immune function and reduces serum tumor markers in colorectal cancer patients after radical surgery
- Highly specific vaginal microbiome signature for gynecological cancers
- Sample size estimation for AQP4-IgG seropositive optic neuritis: Retinal damage detection by optical coherence tomography
- The effects of SDF-1 combined application with VEGF on femoral distraction osteogenesis in rats
- Fabrication and characterization of gold nanoparticles using alginate: In vitro and in vivo assessment of its administration effects with swimming exercise on diabetic rats
- Mitigating digestive disorders: Action mechanisms of Mediterranean herbal active compounds
- Distribution of CYP2D6 and CYP2C19 gene polymorphisms in Han and Uygur populations with breast cancer in Xinjiang, China
- VSP-2 attenuates secretion of inflammatory cytokines induced by LPS in BV2 cells by mediating the PPARγ/NF-κB signaling pathway
- Factors influencing spontaneous hypothermia after emergency trauma and the construction of a predictive model
- Long-term administration of morphine specifically alters the level of protein expression in different brain regions and affects the redox state
- Application of metagenomic next-generation sequencing technology in the etiological diagnosis of peritoneal dialysis-associated peritonitis
- Clinical diagnosis, prevention, and treatment of neurodyspepsia syndrome using intelligent medicine
- Case report: Successful bronchoscopic interventional treatment of endobronchial leiomyomas
- Preliminary investigation into the genetic etiology of short stature in children through whole exon sequencing of the core family
- Cystic adenomyoma of the uterus: Case report and literature review
- Mesoporous silica nanoparticles as a drug delivery mechanism
- Dynamic changes in autophagy activity in different degrees of pulmonary fibrosis in mice
- Vitamin D deficiency and inflammatory markers in type 2 diabetes: Big data insights
- Lactate-induced IGF1R protein lactylation promotes proliferation and metabolic reprogramming of lung cancer cells
- Meta-analysis on the efficacy of allogeneic hematopoietic stem cell transplantation to treat malignant lymphoma
- Mitochondrial DNA drives neuroinflammation through the cGAS-IFN signaling pathway in the spinal cord of neuropathic pain mice
- Application value of artificial intelligence algorithm-based magnetic resonance multi-sequence imaging in staging diagnosis of cervical cancer
- Embedded monitoring system and teaching of artificial intelligence online drug component recognition
- Investigation into the association of FNDC1 and ADAMTS12 gene expression with plumage coloration in Muscovy ducks
- Yak meat content in feed and its impact on the growth of rats
- A rare case of Richter transformation with breast involvement: A case report and literature review
- First report of Nocardia wallacei infection in an immunocompetent patient in Zhejiang province
- Rhodococcus equi and Brucella pulmonary mass in immunocompetent: A case report and literature review
- Downregulation of RIP3 ameliorates the left ventricular mechanics and function after myocardial infarction via modulating NF-κB/NLRP3 pathway
- Evaluation of the role of some non-enzymatic antioxidants among Iraqi patients with non-alcoholic fatty liver disease
- The role of Phafin proteins in cell signaling pathways and diseases
- Ten-year anemia as initial manifestation of Castleman disease in the abdominal cavity: A case report
- Coexistence of hereditary spherocytosis with SPTB P.Trp1150 gene variant and Gilbert syndrome: A case report and literature review
- Utilization of convolutional neural networks to analyze microscopic images for high-throughput screening of mesenchymal stem cells
- Exploratory evaluation supported by experimental and modeling approaches of Inula viscosa root extract as a potent corrosion inhibitor for mild steel in a 1 M HCl solution
- Imaging manifestations of ductal adenoma of the breast: A case report
- Gut microbiota and sleep: Interaction mechanisms and therapeutic prospects
- Isomangiferin promotes the migration and osteogenic differentiation of rat bone marrow mesenchymal stem cells
- Prognostic value and microenvironmental crosstalk of exosome-related signatures in human epidermal growth factor receptor 2 positive breast cancer
- Circular RNAs as potential biomarkers for male severe sepsis
- Knockdown of Stanniocalcin-1 inhibits growth and glycolysis in oral squamous cell carcinoma cells
- The expression and biological role of complement C1s in esophageal squamous cell carcinoma
- A novel GNAS mutation in pseudohypoparathyroidism type 1a with articular flexion deformity: A case report
- Predictive value of serum magnesium levels for prognosis in patients with non-small cell lung cancer undergoing EGFR-TKI therapy
- HSPB1 alleviates acute-on-chronic liver failure via the P53/Bax pathway
- IgG4-related disease complicated by PLA2R-associated membranous nephropathy: A case report
- Baculovirus-mediated endostatin and angiostatin activation of autophagy through the AMPK/AKT/mTOR pathway inhibits angiogenesis in hepatocellular carcinoma
- Metformin mitigates osteoarthritis progression by modulating the PI3K/AKT/mTOR signaling pathway and enhancing chondrocyte autophagy
- Evaluation of the activity of antimicrobial peptides against bacterial vaginosis
- Atypical presentation of γ/δ mycosis fungoides with an unusual phenotype and SOCS1 mutation
- Analysis of the microecological mechanism of diabetic kidney disease based on the theory of “gut–kidney axis”: A systematic review
- Omega-3 fatty acids prevent gestational diabetes mellitus via modulation of lipid metabolism
- Refractory hypertension complicated with Turner syndrome: A case report
- Interaction of ncRNAs and the PI3K/AKT/mTOR pathway: Implications for osteosarcoma
- Association of low attenuation area scores with pulmonary function and clinical prognosis in patients with chronic obstructive pulmonary disease
- Long non-coding RNAs in bone formation: Key regulators and therapeutic prospects
- The deubiquitinating enzyme USP35 regulates the stability of NRF2 protein
- Neutrophil-to-lymphocyte ratio and platelet-to-lymphocyte ratio as potential diagnostic markers for rebleeding in patients with esophagogastric variceal bleeding
- G protein-coupled receptor 1 participating in the mechanism of mediating gestational diabetes mellitus by phosphorylating the AKT pathway
- LL37-mtDNA regulates viability, apoptosis, inflammation, and autophagy in lipopolysaccharide-treated RLE-6TN cells by targeting Hsp90aa1
- The analgesic effect of paeoniflorin: A focused review
- Chemical composition’s effect on Solanum nigrum Linn.’s antioxidant capacity and erythrocyte protection: Bioactive components and molecular docking analysis
- Knockdown of HCK promotes HREC cell viability and inner blood–retinal barrier integrity by regulating the AMPK signaling pathway
- The role of rapamycin in the PINK1/Parkin signaling pathway in mitophagy in podocytes
- Laryngeal non-Hodgkin lymphoma: Report of four cases and review of the literature
- Clinical value of macrogenome next-generation sequencing on infections
- Overview of dendritic cells and related pathways in autoimmune uveitis
- TAK-242 alleviates diabetic cardiomyopathy via inhibiting pyroptosis and TLR4/CaMKII/NLRP3 pathway
- Hypomethylation in promoters of PGC-1α involved in exercise-driven skeletal muscular alterations in old age
- Profile and antimicrobial susceptibility patterns of bacteria isolated from effluents of Kolladiba and Debark hospitals
- The expression and clinical significance of syncytin-1 in serum exosomes of hepatocellular carcinoma patients
- A histomorphometric study to evaluate the therapeutic effects of biosynthesized silver nanoparticles on the kidneys infected with Plasmodium chabaudi
- PGRMC1 and PAQR4 are promising molecular targets for a rare subtype of ovarian cancer
- Analysis of MDA, SOD, TAOC, MNCV, SNCV, and TSS scores in patients with diabetes peripheral neuropathy
- SLIT3 deficiency promotes non-small cell lung cancer progression by modulating UBE2C/WNT signaling
- The relationship between TMCO1 and CALR in the pathological characteristics of prostate cancer and its effect on the metastasis of prostate cancer cells
- Heterogeneous nuclear ribonucleoprotein K is a potential target for enhancing the chemosensitivity of nasopharyngeal carcinoma
- PHB2 alleviates retinal pigment epithelium cell fibrosis by suppressing the AGE–RAGE pathway
- Anti-γ-aminobutyric acid-B receptor autoimmune encephalitis with syncope as the initial symptom: Case report and literature review
- Comparative analysis of chloroplast genome of Lonicera japonica cv. Damaohua
- Human umbilical cord mesenchymal stem cells regulate glutathione metabolism depending on the ERK–Nrf2–HO-1 signal pathway to repair phosphoramide mustard-induced ovarian cancer cells
- Electroacupuncture on GB acupoints improves osteoporosis via the estradiol–PI3K–Akt signaling pathway
- Renalase protects against podocyte injury by inhibiting oxidative stress and apoptosis in diabetic nephropathy
- Review: Dicranostigma leptopodum: A peculiar plant of Papaveraceae
- Combination effect of flavonoids attenuates lung cancer cell proliferation by inhibiting the STAT3 and FAK signaling pathway
- Renal microangiopathy and immune complex glomerulonephritis induced by anti-tumour agents: A case report
- Correlation analysis of AVPR1a and AVPR2 with abnormal water and sodium and potassium metabolism in rats
- Gastrointestinal health anti-diarrheal mixture relieves spleen deficiency-induced diarrhea through regulating gut microbiota
- Myriad factors and pathways influencing tumor radiotherapy resistance
- Exploring the effects of culture conditions on Yapsin (YPS) gene expression in Nakaseomyces glabratus
- Screening of prognostic core genes based on cell–cell interaction in the peripheral blood of patients with sepsis
- Coagulation factor II thrombin receptor as a promising biomarker in breast cancer management
- Ileocecal mucinous carcinoma misdiagnosed as incarcerated hernia: A case report
- Methyltransferase like 13 promotes malignant behaviors of bladder cancer cells through targeting PI3K/ATK signaling pathway
- The debate between electricity and heat, efficacy and safety of irreversible electroporation and radiofrequency ablation in the treatment of liver cancer: A meta-analysis
- ZAG promotes colorectal cancer cell proliferation and epithelial–mesenchymal transition by promoting lipid synthesis
- Baicalein inhibits NLRP3 inflammasome activation and mitigates placental inflammation and oxidative stress in gestational diabetes mellitus
- Impact of SWCNT-conjugated senna leaf extract on breast cancer cells: A potential apoptotic therapeutic strategy
- MFAP5 inhibits the malignant progression of endometrial cancer cells in vitro
- Major ozonated autohemotherapy promoted functional recovery following spinal cord injury in adult rats via the inhibition of oxidative stress and inflammation
- Axodendritic targeting of TAU and MAP2 and microtubule polarization in iPSC-derived versus SH-SY5Y-derived human neurons
- Differential expression of phosphoinositide 3-kinase/protein kinase B and Toll-like receptor/nuclear factor kappa B signaling pathways in experimental obesity Wistar rat model
- The therapeutic potential of targeting Oncostatin M and the interleukin-6 family in retinal diseases: A comprehensive review
- BA inhibits LPS-stimulated inflammatory response and apoptosis in human middle ear epithelial cells by regulating the Nf-Kb/Iκbα axis
- Role of circRMRP and circRPL27 in chronic obstructive pulmonary disease
- Investigating the role of hyperexpressed HCN1 in inducing myocardial infarction through activation of the NF-κB signaling pathway
- Characterization of phenolic compounds and evaluation of anti-diabetic potential in Cannabis sativa L. seeds: In vivo, in vitro, and in silico studies
- Quantitative immunohistochemistry analysis of breast Ki67 based on artificial intelligence
- Ecology and Environmental Science
- Screening of different growth conditions of Bacillus subtilis isolated from membrane-less microbial fuel cell toward antimicrobial activity profiling
- Degradation of a mixture of 13 polycyclic aromatic hydrocarbons by commercial effective microorganisms
- Evaluation of the impact of two citrus plants on the variation of Panonychus citri (Acari: Tetranychidae) and beneficial phytoseiid mites
- Prediction of present and future distribution areas of Juniperus drupacea Labill and determination of ethnobotany properties in Antalya Province, Türkiye
- Population genetics of Todarodes pacificus (Cephalopoda: Ommastrephidae) in the northwest Pacific Ocean via GBS sequencing
- A comparative analysis of dendrometric, macromorphological, and micromorphological characteristics of Pistacia atlantica subsp. atlantica and Pistacia terebinthus in the middle Atlas region of Morocco
- Macrofungal sporocarp community in the lichen Scots pine forests
- Assessing the proximate compositions of indigenous forage species in Yemen’s pastoral rangelands
- Food Science
- Gut microbiota changes associated with low-carbohydrate diet intervention for obesity
- Reexamination of Aspergillus cristatus phylogeny in dark tea: Characteristics of the mitochondrial genome
- Differences in the flavonoid composition of the leaves, fruits, and branches of mulberry are distinguished based on a plant metabolomics approach
- Investigating the impact of wet rendering (solventless method) on PUFA-rich oil from catfish (Clarias magur) viscera
- Non-linear associations between cardiovascular metabolic indices and metabolic-associated fatty liver disease: A cross-sectional study in the US population (2017–2020)
- Knockdown of USP7 alleviates atherosclerosis in ApoE-deficient mice by regulating EZH2 expression
- Utility of dairy microbiome as a tool for authentication and traceability
- Agriculture
- Enhancing faba bean (Vicia faba L.) productivity through establishing the area-specific fertilizer rate recommendation in southwest Ethiopia
- Impact of novel herbicide based on synthetic auxins and ALS inhibitor on weed control
- Perspectives of pteridophytes microbiome for bioremediation in agricultural applications
- Fertilizer application parameters for drip-irrigated peanut based on the fertilizer effect function established from a “3414” field trial
- Improving the productivity and profitability of maize (Zea mays L.) using optimum blended inorganic fertilization
- Application of leaf multispectral analyzer in comparison to hyperspectral device to assess the diversity of spectral reflectance indices in wheat genotypes
- Animal Sciences
- Knockdown of ANP32E inhibits colorectal cancer cell growth and glycolysis by regulating the AKT/mTOR pathway
- Development of a detection chip for major pathogenic drug-resistant genes and drug targets in bovine respiratory system diseases
- Exploration of the genetic influence of MYOT and MB genes on the plumage coloration of Muscovy ducks
- Transcriptome analysis of adipose tissue in grazing cattle: Identifying key regulators of fat metabolism
- Comparison of nutritional value of the wild and cultivated spiny loaches at three growth stages
- Transcriptomic analysis of liver immune response in Chinese spiny frog (Quasipaa spinosa) infected with Proteus mirabilis
- Disruption of BCAA degradation is a critical characteristic of diabetic cardiomyopathy revealed by integrated transcriptome and metabolome analysis
- Plant Sciences
- Effect of long-term in-row branch covering on soil microorganisms in pear orchards
- Photosynthetic physiological characteristics, growth performance, and element concentrations reveal the calcicole–calcifuge behaviors of three Camellia species
- Transcriptome analysis reveals the mechanism of NaHCO3 promoting tobacco leaf maturation
- Bioinformatics, expression analysis, and functional verification of allene oxide synthase gene HvnAOS1 and HvnAOS2 in qingke
- Water, nitrogen, and phosphorus coupling improves gray jujube fruit quality and yield
- Improving grape fruit quality through soil conditioner: Insights from RNA-seq analysis of Cabernet Sauvignon roots
- Role of Embinin in the reabsorption of nucleus pulposus in lumbar disc herniation: Promotion of nucleus pulposus neovascularization and apoptosis of nucleus pulposus cells
- Revealing the effects of amino acid, organic acid, and phytohormones on the germination of tomato seeds under salinity stress
- Combined effects of nitrogen fertilizer and biochar on the growth, yield, and quality of pepper
- Comprehensive phytochemical and toxicological analysis of Chenopodium ambrosioides (L.) fractions
- Impact of “3414” fertilization on the yield and quality of greenhouse tomatoes
- Exploring the coupling mode of water and fertilizer for improving growth, fruit quality, and yield of the pear in the arid region
- Metagenomic analysis of endophytic bacteria in seed potato (Solanum tuberosum)
- Antibacterial, antifungal, and phytochemical properties of Salsola kali ethanolic extract
- Exploring the hepatoprotective properties of citronellol: In vitro and in silico studies on ethanol-induced damage in HepG2 cells
- Enhanced osmotic dehydration of watermelon rind using honey–sucrose solutions: A study on pre-treatment efficacy and mass transfer kinetics
- Effects of exogenous 2,4-epibrassinolide on photosynthetic traits of 53 cowpea varieties under NaCl stress
- Comparative transcriptome analysis of maize (Zea mays L.) seedlings in response to copper stress
- An optimization method for measuring the stomata in cassava (Manihot esculenta Crantz) under multiple abiotic stresses
- Fosinopril inhibits Ang II-induced VSMC proliferation, phenotype transformation, migration, and oxidative stress through the TGF-β1/Smad signaling pathway
- Antioxidant and antimicrobial activities of Salsola imbricata methanolic extract and its phytochemical characterization
- Bioengineering and Biotechnology
- Absorbable calcium and phosphorus bioactive membranes promote bone marrow mesenchymal stem cells osteogenic differentiation for bone regeneration
- New advances in protein engineering for industrial applications: Key takeaways
- An overview of the production and use of Bacillus thuringiensis toxin
- Research progress of nanoparticles in diagnosis and treatment of hepatocellular carcinoma
- Bioelectrochemical biosensors for water quality assessment and wastewater monitoring
- PEI/MMNs@LNA-542 nanoparticles alleviate ICU-acquired weakness through targeted autophagy inhibition and mitochondrial protection
- Unleashing of cytotoxic effects of thymoquinone-bovine serum albumin nanoparticles on A549 lung cancer cells
- Erratum
- Erratum to “Investigating the association between dietary patterns and glycemic control among children and adolescents with T1DM”
- Erratum to “Activation of hypermethylated P2RY1 mitigates gastric cancer by promoting apoptosis and inhibiting proliferation”
- Retraction
- Retraction to “MiR-223-3p regulates cell viability, migration, invasion, and apoptosis of non-small cell lung cancer cells by targeting RHOB”
- Retraction to “A data mining technique for detecting malignant mesothelioma cancer using multiple regression analysis”
- Special Issue on Advances in Neurodegenerative Disease Research and Treatment
- Transplantation of human neural stem cell prevents symptomatic motor behavior disability in a rat model of Parkinson’s disease
- Special Issue on Multi-omics
- Inflammasome complex genes with clinical relevance suggest potential as therapeutic targets for anti-tumor drugs in clear cell renal cell carcinoma
- Gastroesophageal varices in primary biliary cholangitis with anti-centromere antibody positivity: Early onset?