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

Christin Wünsche, Alexander Koch, Roel Goldschmeding, Stephanie Schwalm, Dagmar Meyer Zu Heringdorf, Andrea Huwiler, Josef Pfeilschifter

Research output: Contribution to journalArticleAcademicpeer-review

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 languageEnglish
Pages (from-to)519-526
Number of pages8
JournalBiochimica et Biophysica Acta
Volume1851
Issue number5
DOIs
Publication statusPublished - 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

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