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• W2078781641 endingPage "1041" @default.
• W2078781641 startingPage "1034" @default.
• W2078781641 abstract "It is well-documented that norepinephrine (NE) induces the expression of immediate-early genes (IEGs), such as c-fos, c-jun, and jun-B, in cultured neonatal heart cells and leads to cell growth without cell division (ie, hypertrophy). Although purinergic receptors activated by ATP are present on cardiac myocytes and ATP is coreleased with NE from sympathetic nerve endings within the heart, the potential role of the purinergic system in the cascade of events that leads to cardiac hypertrophy is unknown. We report in the present study that stimulation of purinergic receptors by micromolar concentrations of extracellular ATP increased the levels of c-fos and jun-B mRNA as well as FOS and JUN-B proteins in neonatal cardiac myocytes. The magnitude of response to micromolar ATP was comparable to that elicited by NE. The increase in IEG expression induced by ATP was preceded by a rapid transient increase in cytosolic Ca2+. Pretreatment of myocytes with the intracellular Ca2+ chelator BAPTA-AM prevented the ATP-stimulated increase in cytosolic Ca2+ and attenuated the ATP-stimulated increase in c-fos expression. In contrast, NE did not increase cytosolic Ca2+ in quiescent myocytes, and pretreatment with BAPTA-AM did not inhibit the NE-stimulated increase in c-fos gene expression. Furthermore, although NE markedly increased [14C]phenylalanine incorporation into protein and myocyte hypertrophy measured by cell size, ATP did not. These results demonstrate that stimulation of purinergic receptors by ATP activates IEGs via a Ca(2+)-dependent pathway in cardiac myocytes that differs from the NE stimulated activation of these genes.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W2078781641 created "2016-06-24" @default.
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• W2078781641 date "1994-06-01" @default.
• W2078781641 modified "2023-10-07" @default.
• W2078781641 title "Extracellular ATP induces immediate-early gene expression but not cellular hypertrophy in neonatal cardiac myocytes." @default.
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• W2078781641 doi "https://doi.org/10.1161/01.res.74.6.1034" @default.
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