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- W2134996862 abstract "Infarct scar, a requisite to the rebuilding of necrotic myocardium following myocardial infarction (MI), has long been considered inert. Earlier morphologic studies suggested healing at the infarct site was complete within 6-8 weeks following MI and resultant scar tissue, albeit necessary, was acellular and simply fibrillar collagen. Utilizing molecular and cellular biologic technologies, recent studies indicate otherwise. Infarct scar is composed of phenotypically transformed fibroblast-like cells, termed myofibroblasts (myoFb) because they express alpha-smooth muscle actin (alpha-SMA) and these microfilaments confer contractile behavior in response to various peptides and amines. These cells are nourished by a neovasculature and are persistent at the MI site, where they are metabolically active expressing components requisite to angiotensin (Ang) peptide generation, including converting enzyme, receptors for AngII and transforming growth factor (TGF)-beta1. They continue to elaborate fibrillar type I collagen. Their generation of these peptides contribute to ongoing scar tissue collagen turnover and to fibrous tissue formation of noninfarcted myocardium. Infarct scar contraction accounts for its thinning and its tonus may contribute to abnormal ventricular chamber stiffness with diastolic dysfunction. Infarct scar is a dynamic tissue: cellular, vascularized, metabolically active and contractile. Pharmacologic interventions with angiotensin converting enzyme inhibitor or AT1 receptor antagonist has proven effective in attenuating scar tissue metabolic activity and minimizing adverse accumulation of fibrous tissue in noninfarcted myocardium." @default.
- W2134996862 created "2016-06-24" @default.
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- W2134996862 date "2000-05-01" @default.
- W2134996862 modified "2023-10-18" @default.
- W2134996862 title "Infarct scar: a dynamic tissue" @default.
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- W2134996862 doi "https://doi.org/10.1016/s0008-6363(00)00032-8" @default.
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