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[Connective tissue growth factor synergistically with transforming growth factor beta 1 to promote renal fibrosis]

Min Yang1, Hai-chang Huang, Jing-zi Li

  • 1Institute of Nephrology & Renal Division, Peking University First Hospital, Beijing 100034, China.

Zhonghua Yi Xue Za Zhi
|May 18, 2004
PubMed
Abstract

Insights

Connective tissue growth factor (CTGF) and transforming growth factor-beta(1) (TGF-β1) synergistically promote myofibroblast activation and suppress matrix metalloproteinase-2 (MMP-2) production in renal fibroblasts.

Area of Science:

  • Nephrology
  • Cell Biology
  • Biochemistry

Background:

  • Renal fibrosis involves complex cellular signaling pathways.
  • Myofibroblast activation and extracellular matrix deposition are key pathological features.
  • Matrix metalloproteinase-2 (MMP-2) plays a role in matrix remodeling.

Purpose of the Study:

  • To investigate the combined effects of CTGF and TGF-β1 on renal fibroblast activation.
  • To determine the influence of CTGF and TGF-β1 on MMP-2 synthesis and secretion.
  • To elucidate the role of these factors in myofibroblast differentiation.

Main Methods:

  • Primary rat renal fibroblasts (NRK-49F) were cultured and treated with CTGF, TGF-β1, or both.
  • MMP-2 activity and protein levels were assessed using gelatin zymography and Western blot.
  • MMP-2 mRNA expression was quantified by real-time PCR.
  • Myofibroblast marker alpha-smooth muscle actin (α-SMA) and fibronectin (FN) levels were measured via Western blot and in supernatant, respectively.

Main Results:

  • CTGF and TGF-β1 individually increased MMP-2 activity, protein, and mRNA levels at 48 and 12 hours, respectively.
  • Combined CTGF and TGF-β1 treatment suppressed MMP-2 activity and protein levels compared to individual treatments.
  • TGF-β1 significantly induced α-SMA and fibronectin expression, indicative of myofibroblast activation.
  • CTGF potentiated TGF-β1-induced α-SMA and fibronectin expression.

Conclusions:

  • CTGF synergizes with TGF-β1 to promote myofibroblast differentiation in renal fibroblasts.
  • The combination of CTGF and TGF-β1 down-regulates MMP-2 production.
  • These findings highlight a complex interplay between growth factors in renal fibrogenesis.

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