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• W2085461145 startingPage "2153" @default.
• W2085461145 abstract "'Cardiosomes' (exosomes from cardiomyocytes) have recently emerged as nanovesicles (30-100 nm) released in the cardiosphere by myocytes and cardiac progenitor cells, though their role in diabetes remains elusive. Diabetic cardiovascular complications are unequivocally benefitted from exercise; however, the molecular mechanisms need exploration. This novel study is based on our observation that exercise brings down the levels of activated (Matrix Metalloprotease 9) in db/db mice in a model of type 2 diabetes. We hypothesize that exosomes that are released during exercise contain microRNAs (mir455, mir29b, mir323-5p and mir466) that bind to the 3' region of MMP9 and downregulate its expression, hence mitigating the deleterious downstream effects of MMP9, which causes extracellular matrix remodeling. First, we confirmed the presence of exosomes in the heart tissue and serum by electron microscopy and flow cytometry, respectively, in the four treatment groups: (i) db/control, (ii) db/control+exercise, (iii) db/db and (iv) db/db+exercise. Use of exosomal markers CD81, Flottilin 1, and acetylcholinesterase activity in the isolated exosomes confirmed enhanced exosomal release in the exercise group. The microRNAs isolated from the exosomes contained mir455, mir29b, mir323-5p and mir466 as quantified by qRTPCR, however, mir29b and mir455 showed highest upregulation. We performed 2D zymography which revealed significantly lowered activity of MMP9 in the db/db exercise group as compared to non-exercise group. The immunohistochemical analysis further confirmed the downregulated expression of MMP9 after exercise. Since MMP9 is involved in matrix degradation and leads to fibrosis and myocyte uncoupling, the present study provides a strong evidence how exercise can mitigate these conditions in diabetic patients." @default.
• W2085461145 created "2016-06-24" @default.
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• W2085461145 date "2015-03-30" @default.
• W2085461145 modified "2023-10-17" @default.
• W2085461145 title "Cardiosome mediated regulation of MMP9 in diabetic heart: role of mir29b and mir455 in exercise" @default.
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• W2085461145 doi "https://doi.org/10.1111/jcmm.12589" @default.
• W2085461145 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4568920" @default.
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