Section 10
Chapter 9,837

Endothelin is a potent inhibitor of matrix metalloproteinase-2 secretion and activation in rat mesangial cells

Yao, J.; Morioka, T.; Li, B.; Oite, T.

American Journal of Physiology. Renal Physiology 280(4): F628-F635


ISSN/ISBN: 1931-857X
PMID: 11249854
DOI: 10.1152/ajprenal.2001.280.4.f628
Accession: 009836398

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We examined the effects of endothelin (ET) on the activity of matrix metalloproteinase-2 (MMP-2) in cultured MCs. Addition of the ETA receptor antagonists or neutralizing anti-endothelin antibody into MC cultures markedly augmented the secretion and activation of MMP-2. On the contrary, addition of the exogenous ET-1 into MC culture significantly inhibited the synthesis of MMP-2 in both basal and cytokines (tumor necrosis factor-a and interferon-c) plus lipopolysaccharide-stimulated conditions. Furthermore, pretreatment of cells with exogenous ET-1 obviously prevented cytochalasin D-elicited activation of MMP-2, an effect that was completely abolished by ETA receptor antagonist, FR139317. In addition, ET-1 was found to be able to suppress the expression of membrane type-1 MMP (MT1-MMP) and promote the conversion of tissue inhibitor of matrix metalloproteinase-2 (TIMP-2) from cell associated form to secreted form. The addition of recombinant TIMP-2 into the culture abrogated dose-dependently the cytochalasin D-elicited activation of MMP-2. These results suggest that ET is a potent inhibitor of MMP-2 secretion and activation in MCs. These novel findings may help us understand the subtle regulation of the synthesis and activation of MMP-2 in MCs. It also provides us with further insight into the pathophysiological mechanisms involving ET in the regulation of matrix turnover in glomerulus. Reprinted by permission of the publisher.

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