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- W2120873170 abstract "A potential link between tissue-type transglutaminase (tTG) and cardiac hypertrophy was suggested recently. However, whether tTG is implicated in hypertrophic agonist-induced cardiac hypertrophy is not yet known. The purpose of this study was to investigate the effects of tTG on cardiomyocyte hypertrophy induced by endothelin (ET) 1. Real-time quantitative RT-PCR and Western blot analysis demonstrated that ET-1 increased the expression of tTG mRNA and protein in cardiomyocytes by activating ET(A) receptors. ET-1 failed to cause increases in cell size and [(3)H]leucine uptake, sarcomere reorganization, and gene induction of the atrial natriuretic factor when cardiomyocytes were treated with monodansylcadaverine, a competitive inhibitor of tTG. Furthermore, the effects of ET-1 on multifunctional activities of tTG were determined by evaluating the incorporation of [(3)H]putrescine into N,N'-dimethylated casein and charcoal absorption, respectively. The results showed that ET-1 did not influence the basal transglutaminase activity of cardiomyocytes but significantly inhibited the 0.1-mmol/L Ca(2+)-stimulated transglutaminase activity. Otherwise, ET-1 elevated the activity of GTPase in a concentration- and time-dependent manner. In vivo, right ventricular hypertrophy induced by 2 weeks of chronic hypoxia was depressed by the tTG inhibitor cystamine (10 to 30 mg/kg, 2 times per day, IP) in a dose-dependent manner. Taken together, our data strongly supported the notion that tTG may act as a positive regulator of the hypertrophic program in response to ET-1. This is probably attributable to the signaling activity of tTG rather than transglutaminase activity." @default.
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- W2120873170 date "2009-10-01" @default.
- W2120873170 modified "2023-10-18" @default.
- W2120873170 title "Involvement of Tissue Transglutaminase in Endothelin 1–Induced Hypertrophy in Cultured Neonatal Rat Cardiomyocytes" @default.
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- W2120873170 doi "https://doi.org/10.1161/hypertensionaha.109.130161" @default.
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