ASSOCIATION OF TUMOR NECROSIS FACTOR α, INTERLEUKIN 6, AND INTERLEUKIN 10 PROMOTER POLYMORPHISM WITH PROLIFERATIVE DIABETIC RETINOPATHY IN TYPE 2 DIABETIC SUBJECTS

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Background— Class A macrophage scavenger receptor (SR-A) is a macrophage-restricted multifunctional molecule that optimizes the inflammatory response by modulation of the activity of inflammatory cytokines. This study was conducted with SR-A–deficient (SR-A −/− ) mice to evaluate the relationship between SR-A and cardiac remodeling after myocardial infarction. Methods and Results— Experimental myocardial infarction (MI) was produced by ligation of the left coronary artery in SR-A −/− and wild-type (WT) male mice. The number of mice that died within 4 weeks after MI was significantly greater in SR-A −/− mice than in WT mice ( P =0.03). Importantly, death caused by cardiac rupture within 1 week after MI was 31% (17 of 54 mice) in SR-A −/− mice and 12% (6 of 51 mice) in WT mice ( P =0.01). In situ zymography demonstrated augmented gelatinolytic activity in the infarcted myocardium in SR-A −/− mice compared with WT mice. Real-time reverse transcription–polymerase chain reaction at day 3 after MI showed that the expression of matrix metalloproteinase-9 mRNA increased significantly in the infarcted myocardium in SR-A −/− mice compared with WT mice. Furthermore, SR-A −/− mice showed augmented expression of tumor necrosis factor-α and reduction of interleukin-10 in the infarcted myocardium at day 3 after MI. In vitro experiments also demonstrated increased tumor necrosis factor-α and decreased interleukin-10 expression in activated SR-A −/− macrophages. Conclusions— The present findings suggest that SR-A deficiency might cause impairment of infarct remodeling that results in cardiac rupture via insufficient production of interleukin-10 and enhanced expression of tumor necrosis factor-α and of matrix metalloproteinase-9. SR-A might contribute to the prevention of cardiac rupture after MI.


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