Inhibition of JAK2/STAT3 signaling suppresses bone marrow stromal cells proliferation and osteogenic differentiation, and impairs bone defect healing
Abstract
Mesenchymal stem cells (MSCs) undergo osteogenic differentiation during bone defect healing. However, the role of JAK2/STAT3 in the osteogenic differentiation of MSCs and bone defect healing is still not fully understood. In this study, we aimed to analyze the effect of AG490, a JAK2-specific inhibitor, on MSCs proliferation and osteogenic differentiation as well as in bone defect healing. We used AG490 to inhibit the JAK2/STAT3 signaling in a mice bone marrow stromal cells (BMSCs) culture. AG490 inhibited BMSCs proliferation and osteogenic differentiation markers, i.e. Col1α, Alp and Ocn expression in mRNA and protein levels. Inhibition of JAK2 reduced ALP activity and matrix mineralization in BMSCs culture. Inhibition of JAK2 reduced phosphorylation of STAT3, AKT, P38, and JNK phosphorylation. Immunohistochemistry showed high numbers of pJAK2, pSTAT3 and ALP positive cells and AG490 reduced this effect in vivo. Histology and μ-computed tomography (CT) data showed that AG490 treatment inhibits bone regeneration and bone defect healing. Our results clearly showed the inhibitory effect of AG490 on proliferation and osteogenic differentiation of BMSCs, bone regeneration and bone defect healing. Moreover, AG490 inhibited phosphorylation of STAT3, P38, JNK and AKT. This suggests the possible role of JAK2/STAT3 signaling in hypoxia-induced osteogenic differentiation of MSCs and bone defect healing.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 81470718
Award Identifier / Grant number: 81470724
Award Identifier / Grant number: 81100736
Award Identifier / Grant number: 81771051
Funding statement: This study was supported by the funds of National Natural Science Foundation of China (grant Nos: 81470718, 81470724, 81100736 and 81771051), Guangzhou Education Bureau (grant No: 1201610458), Guangzhou Science Technology and Innovation Commission (grant No: 201704030024), Department of Science and Technology of Guangdong Province (grant No: 2015B09092002), The National Key Research and Development Program of China (grant Nos: 2016YFC1102900, 2016YFC1102902), and Zhejiang Provincial Natural Science Foundation of China (grant No: Y17H140023).
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Supplementary Material:
The online version of this article offers supplementary material (https://doi.org/10.1515/hsz-2018-0253).
©2018 Walter de Gruyter GmbH, Berlin/Boston
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Artikel in diesem Heft
- Frontmatter
- Reviews
- Interaction of volatile organic compounds and underlying liver disease: a new paradigm for risk
- Five decades of research on mitochondrial NADH-quinone oxidoreductase (complex I)
- Modifications in small nuclear RNAs and their roles in spliceosome assembly and function
- Minireview
- Transcriptional regulation of human defense peptides: a new direction in infection control
- Research Articles/Short Communications
- Cell Biology and Signaling
- Down-regulated paxillin suppresses cell proliferation and invasion by inhibiting M2 macrophage polarization in colon cancer
- p21Waf1 deficiency does not decrease DNA repair in E1A+cHa-Ras transformed cells by HDI sodium butyrate
- MAC30 knockdown involved in the activation of the Hippo signaling pathway in breast cancer cells
- Inhibition of JAK2/STAT3 signaling suppresses bone marrow stromal cells proliferation and osteogenic differentiation, and impairs bone defect healing
- IL-37 affects the occurrence and development of endometriosis by regulating the biological behavior of endometrial stromal cells through multiple signaling pathways
- Resveratrol alleviates early brain injury following subarachnoid hemorrhage: possible involvement of the AMPK/SIRT1/autophagy signaling pathway