Transforming growth factor β2 (TGF-β2)-induced connective tissue growth factor (CTGF) expression requires sphingosine 1-phosphate receptor 5 (S1P5) in human mesangial cells.

Transforming growth factor β2 (TGF-β2)-induced connective tissue growth factor (CTGF) expression requires sphingosine 1-phosphate receptor 5 (S1P5) in human mesangial cells.
Biochim Biophys Acta. 2015 Jan 17;
Authors: Wünsche C, Koch A, Goldschmeding R, Schwalm S, Meyer Zu Heringdorf D, Huwiler A, Pfeilschifter J
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.
PMID: 25601519 [PubMed - as supplied by publisher]

Source: Biochimica et Biophysica Acta - January 17, 2015 Category: Biochemistry Authors: Wünsche C, Koch A, Goldschmeding R, Schwalm S, Meyer Zu Heringdorf D, Huwiler A, Pfeilschifter J Tags: Biochim Biophys Acta Source Type: research