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Inhibition of protein kinase C reduces left ventricular fibrosis and dysfunction following myocardial infarction. | LitMetric

AI Article Synopsis

Article Abstract

Despite current therapies, chronic heart failure (CHF) remains a major complication of myocardial infarction (MI). The pathological changes that follow MI extend to regions remote from the site of infarction (non-infarct zone, NIZ) where fibrosis is a prominent finding. Although the mechanisms underlying this adverse remodeling are incompletely understood, activation of protein kinase C has recently been implicated in its pathogenesis. MI was induced in Sprague-Dawley rats by ligation of the left anterior descending coronary artery. One week post-MI, animals were randomized to receive the PKC-inhibitor, ruboxistaurin (LY333531) for 4 weeks, or no treatment. When compared with sham-operated animals, post-MI rats showed a 33+/-7% reduction in fractional shortening over a 4 weeks period, that was attenuated by treatment with ruboxistaurin (6+/-11%, P<0.05). Increased matrix deposition was noted in the NIZ, particularly in the subendocardial region of post-MI rats, in association with elevated expression of the profibrotic growth factor, transforming growth factor-beta. These findings were also significantly reduced by ruboxistaurin. PKC-inhibition with ruboxistaurin led to attenuation in both the pathological fibrosis and impaired cardiac function that follow experimental MI, suggesting a possible role for this agent in preventing post-infarction heart failure.

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http://dx.doi.org/10.1016/j.yjmcc.2005.03.008DOI Listing

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