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- W226109780 abstract "Phorbol 12-myristate 13-acetate (PMA), norepinephrine (NE), angiotensin II (AII) and contraction stimulate cardiomyocyte growth. Differences exist in the time course and extent of protein and RNA accumulation. Cells plated at 4 {times} 10{sup 6} cells/60mm dish and arrested with 50 mM KCl demonstrated no significant growth. Treatment with PMA stimulated growth to a maximum of 17% at 48 h. In contrast, maximal stimulation of growth was 36% at 48 h and 31% at 72 h for contracting and NE treated cells, respectively. Maximal stimulation of the capacity for protein synthesis was 32% for PMA treated cells at 24 h as compared to 59% and 77% for NE treated and contracting cells respectively at 72 h. In support of a primary role for altered capacity in the regulation of protein synthesis, there was a significant correlation between RNA and protein content independent of the stimulus used. AII increased RNA content by 28% at 48h, but had no effect on growth up to 72h. Treatment with staurosporine blocked the stimulation of growth, suggestive of a role for protein kinase C (PKC). However, the inhibition of contraction-induced growth was due in part to a reduction in the rate of contraction. It was concludedmore » that: significant differences existed in the time course of growth stimulation and RNA accumulation, depending on the stimulus; and growth inhibition by staurosporine is suggestive of an important role of PKC in hypertrophic growth induced by these stimuli.« less" @default.
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- W226109780 date "1991-02-04" @default.
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- W226109780 title "Comparison of the hypertrophic effect of phorbol ester norepinephrine angiotensin ii and contraction on cultured cardiomyocytes" @default.
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