Abstract
Transforming growth factor β2 (TGF-β2) is well known to stimulate the expression of pro-fibrotic connective tissue growth factor (CTGF) in several cell types including human mesangial cells. The present study demonstrates that TGF-β2 enhances sphingosine 1-phosphate receptor 5 (S1P5) mRNA and protein expression in a time and concentration dependent manner. Pharmacological and siRNA approaches reveal that this upregulation is mediated via activation of classical TGF-β downstream effectors, Smad and mitogen-activated protein kinases. Most notably, inhibition of Gi with pertussis toxin and downregulation of S1P5 by siRNA block TGF-β2-stimulated upregulation of CTGF, demonstrating that Gi coupled S1P5 is necessary for TGF-β2-triggered expression of CTGF in human mesangial cells. Overall, these findings indicate that TGF-β2 dependent upregulation of S1P5 is required for the induction of pro-fibrotic CTGF by TGF-β. Targeting S1P5 might be an attractive novel approach to treat renal fibrotic diseases.
Original language | English |
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Pages (from-to) | 519-526 |
Number of pages | 8 |
Journal | Biochimica et Biophysica Acta |
Volume | 1851 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Cells, Cultured
- Connective Tissue Growth Factor
- Dose-Response Relationship, Drug
- GTP-Binding Protein alpha Subunits, Gi-Go
- Humans
- Mesangial Cells
- Mitogen-Activated Protein Kinases
- Protein Kinase Inhibitors
- RNA Interference
- RNA, Messenger
- Receptors, Lysosphingolipid
- Smad4 Protein
- Time Factors
- Transfection
- Transforming Growth Factor beta2
- Up-Regulation
- Sphingosine 1-phosphate
- S1P receptor
- Transforming growth factor β2
- Connective tissue growth factor
- Human mesangial cell
- Kidney