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- W2019594311 abstract "Cardiac gene expression of atrial natriuretic peptide (ANP) and that of brain natriuretic peptide (BNP) are markedly elevated after myocardial infarction. The cellular distribution and temporal responses of ANP and BNP messenger RNA (mRNA) expression were compared by in situ hybridization for 5 weeks after left coronary artery ligation in sheep. Ligation resulted in highly reproducible, transmural, left ventricular infarcts. Within the infarct, ANP mRNA appeared from 7 days after ligation, whereas BNP expression was undetectable in the infarct at any time. The cells synthesizing ANP were shown by in situ hybridization and immunocytochemistry to be fibroblasts invading the infarct. The appearance of ANP expression coincided with the transition of these cells to the myofibroblast phenotype. Treatment of cultured cardiac fibroblasts with transforming growth factor-beta (10 ng/ml) induced the expression of alpha-smooth muscle actin, characteristic of the transformation to myofibroblasts, and raised ANP concentrations in the medium. In the surviving myocardium of the left ventricle, ANP and BNP expression increased in response to ligation, BNP mRNA was particularly strong at the lateral margins of the infarct. In both left and right atria, levels of BNP mRNA increased markedly over the first 18 h, whereas levels of atrial ANP mRNA decreased over 3 days after infarction. This is the first report of ANP expression and synthesis by cardiac fibroblasts invading the fibrotic scar, suggesting that ANP may be involved in regulating fibroblast proliferation during reparative fibrosis." @default.
- W2019594311 created "2016-06-24" @default.
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- W2019594311 date "2000-12-01" @default.
- W2019594311 modified "2023-10-18" @default.
- W2019594311 title "Atrial (ANP) and Brain Natriuretic Peptide (BNP) Expression after Myocardial Infarction in Sheep: ANP Is Synthesized by Fibroblasts Infiltrating the Infarct<sup>1</sup>" @default.
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- W2019594311 doi "https://doi.org/10.1210/endo.141.12.7847" @default.
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