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- W1984751552 abstract "In response to humoral and mechanical stimuli, the myocardium adapts to increased work load through hypertrophy of individual muscle cells. Myocardial hypertrophy is characterized by an increase in cell size in the absence of cell division and is accompanied by changes in gene expression. Angiotensin II (Ang II), the effector peptide of the renin-angiotensin system (RAS), regulates volume and electrolyte homeostasis and is involved in cardiac and vascular growth in rats. In this review, the role of RAS in myocyte protein synthesis (myocyte hypertrophy) and in induction of gene expression will be discussed in rat cardiomyocytes in culture. Traditional RAS can be considered as a system in which circulating Ang II is delivered to target tissues or cells. However, a local RAS has also been described in cardiac cells and evidence has been accumulated for autocrine and/or paracrine pathways by which biological actions of Ang II can be mediated. These actions of Ang II are primarily mediated through Ang II receptors subtype I (AT1-R). When evaluating the effects of Ang II in situ, both changes in circulating levels and local production have to be taken into account. Contrasting results have been found concerning the in vitro effect of Ang II on the protein synthesis in cardiac myocytes and can be at least partly be attributed to methodological problems such as assay of de novo protein synthesis and isolation and separation procedure of cardiac myocytes. The Ang II-induced hypertrophic effect also depends on the existence of nonmyocytes in a cardiocyte culture. In rat cardiocytes, AngII also causes induction of many immediately-early genes (c-fos, c-jun, jun-B, Egr-1 and c-myc) and induces also late markers of cardiac hypertrophy (skeletal alpha-actin and atrial natriuretic peptide expression) and growth factors (TGF-beta 1 gene expression). In vivo AngII via AT1-R, causes not only ventricular hypertrophy but also a shift to the fetal phenotype of the myocardium. Angiotensin-converting enzyme inhibitors and AngII receptor antagonists of the subtype I not only induce the regression but also prevent the development of cardiac hypertrophy in experimental rat models." @default.
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- W1984751552 date "1999-01-01" @default.
- W1984751552 modified "2023-09-25" @default.
- W1984751552 title "Antagonism of the renin-angiotensin system, hypertrophy and gene expression in cardiac myocytes" @default.
- W1984751552 doi "https://doi.org/10.1358/mf.1999.21.5.541915" @default.
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