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• W2022759861 abstract "Platelet-derived-growth-factor-BB (PDGF-BB) can protect various cell types from apoptotic cell death, and induce hypertrophic growth and proliferation, but little is known about its direct or indirect effects on cardiomyocytes. Cardiac muscle engineering is compromised by a particularly high rate of cardiomyocyte death. Here we hypothesized that PDGF-BB stimulation can (1) protect cardiomyocytes from apoptosis, (2) enhance myocyte content in and (3) consequently optimize contractile performance of engineered heart tissue (EHT). We investigated the effects of PDGF-receptor activation in neonatal rat heart monolayer- and EHT-cultures by isometric contraction experiments, cytomorphometry, 3H-thymidine and 3H-phenylalanine incorporation assays, quantitative PCR (calsequestrin 2, α-cardiac and skeletal actin, atrial natriuretic factor, α- and β-myosin heavy chain), immunoblotting (activated caspase 3, Akt-phosphorylation), and ELISA (cell death detection). PDGF-BB did not induce hypertrophy or proliferation in cardiomyocytes, but enhanced contractile performance of EHT. This effect was concentration-dependent (Emax 10 ng/ml) and maximal only after transient PDGF-BB stimulation (culture days 0–7; total culture duration: 12 days). Improvement of contractile function was associated with higher cardiomyocyte content, as a consequence of PDGF-BB mediated protection from apoptosis (lower caspase-3 activity particularly in cardiomyocytes in PDGF-BB treated vs. untreated EHTs). We confirmed the anti-apoptotic effect of PDGF-BB in monolayer cultures and observed that PI3-kinase inhibition with LY294002 attenuated PDGF-BB-mediated cardiomyocyte protection. We conclude that PDGF-BB does not induce hypertrophy or proliferation, but confers an anti-apoptotic effect on cardiomyocytes. Our findings suggest a further exploitation of PDGF-BB in cardiomyocyte protection in vivo and in vitro." @default.
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• W2022759861 date "2010-06-01" @default.
• W2022759861 modified "2023-09-25" @default.
• W2022759861 title "PDGF-BB protects cardiomyocytes from apoptosis and improves contractile function of engineered heart tissue" @default.
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• W2022759861 doi "https://doi.org/10.1016/j.yjmcc.2010.03.008" @default.
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