Sphingosine kinase 2 deficiency increases proliferation and migration of renal mouse mesangial cells and fibroblasts
-
Stephanie Schwalm
, Tankica Maneva Timcheva
Abstract
Both of the sphingosine kinase (SK) subtypes SK-1 and SK-2 catalyze the production of the bioactive lipid molecule sphingosine 1-phosphate (S1P). However, the subtype-specific cellular functions are largely unknown. In this study, we investigated the cellular function of SK-2 in primary mouse renal mesangial cells (mMC) and embryonic fibroblasts (MEF) from wild-type C57BL/6 or SK-2 knockout (SK2ko) mice. We found that SK2ko cells displayed a significantly higher proliferative and migratory activity when compared to wild-type cells, with concomitant increased cellular activities of the classical extracellular signal regulated kinase (ERK) and PI3K/Akt cascades, and of the small G protein RhoA. Furthermore, we detected an upregulation of SK-1 protein and S1P3 receptor mRNA expression in SK-2ko cells. The MEK inhibitor U0126 and the S1P1/3 receptor antagonist VPC23019 blocked the increased migration of SK-2ko cells. Additionally, S1P3ko mesangial cells showed a reduced proliferative behavior and reduced migration rate upon S1P stimulation, suggesting a crucial involvement of the S1P3 receptor. In summary, our data demonstrate that SK-2 exerts suppressive effects on cell growth and migration in renal mesangial cells and fibroblasts, and that therapeutic targeting of SKs for treating proliferative diseases requires subtype-selective inhibitors.
Acknowledgments
This work was supported by the Swiss National Science Foundation (3100A0–111806), and the German Research Foundation (SFB1039/TP02). We thank Isolde Römer and Simone Albert for technical assistance.
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©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Guest Editorial
- Highlight: Molecular Medicine of Sphingolipids
- HIGHLIGHT: MOLECULAR MEDICINE OF SPHINGOLIPIDS
- The role of serum amyloid A and sphingosine-1-phosphate on high-density lipoprotein functionality
- Sphingolipids in viral infection
- Tackling the biophysical properties of sphingolipids to decipher their biological roles
- Ceramide and sphingosine in pulmonary infections
- Molecular mechanisms of erythrocyte aging
- Sphingolipids in liver injury, repair and regeneration
- Ultrasound-stimulated microbubble enhancement of radiation response
- Innate immune responses in the brain of sphingolipid lysosomal storage diseases
- Novel mechanisms of action of classical chemotherapeutic agents on sphingolipid pathways
- The role of sphingolipids in endothelial barrier function
- The effect of altered sphingolipid acyl chain length on various disease models
- Secretory sphingomyelinase in health and disease
- Preclinical development of a C6-ceramide NanoLiposome, a novel sphingolipid therapeutic
- Sphingomyelin breakdown in T cells: role in activation, effector functions and immunoregulation
- The molecular medicine of acid ceramidase
- Caenorhabditis elegans as a model to study sphingolipid signaling
- S1PR4 is required for plasmacytoid dendritic cell differentiation
- Antinociceptive effects of FTY720 during trauma-induced neuropathic pain are mediated by spinal S1P receptors
- Subcellular distribution of FTY720 and FTY720-phosphate in immune cells – another aspect of Fingolimod action relevant for therapeutic application
- Downregulation of sphingosine 1-phosphate (S1P) receptor 1 by dexamethasone inhibits S1P-induced mesangial cell migration
- Sphingosine kinase 2 deficiency increases proliferation and migration of renal mouse mesangial cells and fibroblasts
- Obituary
- The life and work of Dr. Robert Bittman (1942–2014)
Articles in the same Issue
- Frontmatter
- Guest Editorial
- Highlight: Molecular Medicine of Sphingolipids
- HIGHLIGHT: MOLECULAR MEDICINE OF SPHINGOLIPIDS
- The role of serum amyloid A and sphingosine-1-phosphate on high-density lipoprotein functionality
- Sphingolipids in viral infection
- Tackling the biophysical properties of sphingolipids to decipher their biological roles
- Ceramide and sphingosine in pulmonary infections
- Molecular mechanisms of erythrocyte aging
- Sphingolipids in liver injury, repair and regeneration
- Ultrasound-stimulated microbubble enhancement of radiation response
- Innate immune responses in the brain of sphingolipid lysosomal storage diseases
- Novel mechanisms of action of classical chemotherapeutic agents on sphingolipid pathways
- The role of sphingolipids in endothelial barrier function
- The effect of altered sphingolipid acyl chain length on various disease models
- Secretory sphingomyelinase in health and disease
- Preclinical development of a C6-ceramide NanoLiposome, a novel sphingolipid therapeutic
- Sphingomyelin breakdown in T cells: role in activation, effector functions and immunoregulation
- The molecular medicine of acid ceramidase
- Caenorhabditis elegans as a model to study sphingolipid signaling
- S1PR4 is required for plasmacytoid dendritic cell differentiation
- Antinociceptive effects of FTY720 during trauma-induced neuropathic pain are mediated by spinal S1P receptors
- Subcellular distribution of FTY720 and FTY720-phosphate in immune cells – another aspect of Fingolimod action relevant for therapeutic application
- Downregulation of sphingosine 1-phosphate (S1P) receptor 1 by dexamethasone inhibits S1P-induced mesangial cell migration
- Sphingosine kinase 2 deficiency increases proliferation and migration of renal mouse mesangial cells and fibroblasts
- Obituary
- The life and work of Dr. Robert Bittman (1942–2014)