Differential Effects of Transforming Growth Factor-Beta on the Synthesis of Connective Tissue Growth Factor and Vascular Endothelial Growth Factor by Peritoneal Mesothelial Cell (original) (raw)
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Research Articles| February 10 2005
Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
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Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Search for other works by this author on:
Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Search for other works by this author on:
Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Search for other works by this author on:
Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Search for other works by this author on:
Departments of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, China
Search for other works by this author on:
Nephron Experimental Nephrology (2005) 99 (4): e95–e104.
Received:
September 03 2004
Accepted:
September 29 2004
Published Online:
February 10 2005
Abstract
Background: Previous studies found that transforming growth factor-β (TGF-β) plays a conflicting role in peritoneal fibrosis. We hypothesise that TGF-β acts on peritoneal mesothelial cells (PMC) via VEGF and CTGF as downstream mediators. Methods: The effect of TGF-β in primary culture of rat PMC was studied. VEGF and CTGF mRNA expression was examined by real time quantitative polymerase chain reaction (RT-QPCR), and VEGF antigen level in cell supernatant by ELISA. Results: Incubation of rat PMC with TGF-β resulted in a time- (3–72 h) and concentration- (0–50 pg/ml) dependent increase in VEGF mRNA expression, and VEGF protein level in the cell supernatant. When stimulated with TGF-β 100 pg/ml, there was a 20-fold up-regulation of VEGF mRNA expression (p < 0.001). The CTGF mRNA expression and protein level of PMC was slightly increased at low concentration of TGF-β (50 pg/ml) but decreased at a higher concentration (100 pg/ml or above). The effect of TGF-β on PMC CTGF, but not VEGF, gene expression was inhibited by Smad decoy oligodeoxynucleotide. The effect of TGF-β on PMC VEGF gene expression and protein synthesis was inhibited by PD98059 (a specific MAP kinase inhibitor) and chelerythrine (a specific protein kinase C inhibitor), but not cholera toxin (activator of cyclic AMP) or herbimycin A (inhibitor of protein tyrosine kinase). The up-regulation of CTGF mRNA expression was inhibited by PD98059, but not chelerythrine, cholera toxin or herbimycin A. Furthermore, CTGF gene expression in TGF-β-stimulated PMC was inhibited by co-administration of recombinant VEGF. Conclusions: Our data demonstrate that TGF-β induces PMC production of VEGF and CTGF via different signalling pathways. At high concentration of TGF-β, VEGF production predominates and CTGF production was inhibited. Since CTGF and VEGF have different biologic effects, our results may explain the complex activity of TGF-β in peritoneal physiology.
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