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• W2028305671 abstract "Changes in the synthesis and activity of matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) are associated with myocardial remodeling. Here we measured the expression and activity of MMPs and TIMPs, and tested the hypothesis that increased MMP activity plays a proapoptotic role in β-adrenergic receptor (β-AR)-stimulated apoptosis of adult rat ventricular myocytes (ARVMs). β-AR stimulation (isoproterenol, 24 h) increased mRNA levels of MMP-2 and TIMP-1 while it decreased TIMP-2 mRNA levels as analyzed by real-time PCR. Western blot analysis, immunocytochemical analysis, in-gel zymography, and MMP-2 activity assay confirmed β-AR-stimulated increases in MMP-2 protein levels and activity. Inhibition of MMPs using GM-6001 (a broad-spectrum inhibitor of MMPs), SB3CT (inhibitor of MMP-2), and purified TIMP-2 inhibited β-AR-stimulated apoptosis as determined by TdT-mediated dUTP nick end labeling staining. Treatment with active MMP-2 alone increased the number of apoptotic cells. This increase in MMP-2-mediated apoptosis was inhibited by GM-6001 and SB3CT pretreatment. Coimmunoprecipitation studies indicated increased physical association of MMP-2 with β 1 -integrins after β-AR stimulation. Inhibition of MMP-2 using SB3CT or stimulation of β 1 -integrin signaling using laminin inhibited the increased association of MMP-2 with β 1 -integrins. β-AR stimulation increased poly-ADP-ribose-polymerase cleavage, which was inhibited by inhibition of MMP-2. These data suggest the following: 1) β-AR stimulation increases MMP-2 expression and activity and inhibits TIMP-2 expression; 2) inhibition of MMPs, most likely MMP-2, inhibits β-AR-stimulated apoptosis; and 3) the apoptotic effects of MMP-2 may be mediated, at least in part, via its interaction with β 1 integrins and poly-ADP-ribose-polymerase cleavage." @default.
• W2028305671 created "2016-06-24" @default.
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• W2028305671 date "2005-07-01" @default.
• W2028305671 modified "2023-10-15" @default.
• W2028305671 title "Matrix metalloproteinases mediate β-adrenergic receptor-stimulated apoptosis in adult rat ventricular myocytes" @default.
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• W2028305671 doi "https://doi.org/10.1152/ajpcell.00606.2004" @default.
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