Propranolol promotes Egr1 gene expression in cardiomyocytes via beta-adrenoceptors (Articolo in rivista)

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  • Propranolol promotes Egr1 gene expression in cardiomyocytes via beta-adrenoceptors (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Patrizio M.a,1, Musumeci M.a,1, Stati T.a, Fecchi K.a, Mattei E.c, Catalano L.b, Marano G.a (2008)
    Propranolol promotes Egr1 gene expression in cardiomyocytes via beta-adrenoceptors
    in European journal of pharmacology
    (literal)
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  • Patrizio M.a,1, Musumeci M.a,1, Stati T.a, Fecchi K.a, Mattei E.c, Catalano L.b, Marano G.a (literal)
Pagina inizio
  • 85 (literal)
Pagina fine
  • 89 (literal)
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  • Impact factor = 2.522 (literal)
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  • 587/1 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
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  • a) Dipartimento del Farmaco, Istituto Superiore di Sanità, Rome, Italy; b) Centro Nazionale Sangue, Rome, Italy; c) Istituto di Neurobiologia e Medicina Molecolare, INMM; Consiglio Nazionale delle Ricerche, Rome, Italy. 1 = These authors contributed equally to the work. (literal)
Titolo
  • Propranolol promotes Egr1 gene expression in cardiomyocytes via beta-adrenoceptors (literal)
Abstract
  • Recent research has revealed that propranolol, a ²-adrenoceptor antagonist, causes extracellular signal-regulated kinase (ERK) cascade activation, nuclear translocation of phospho-ERK and increased transcriptional activity in cultured cell lines. Given the importance of ²-adrenoceptor antagonists in the treatment of heart failure, we evaluated the capability of propranolol of promoting the ERK-dependent gene expression at the cardiomyocyte level. To this end, the gene expression of the early growth response factor 1 (Egr1), a well-recognized indicator of nuclear extracellular signal-regulated kinase 1/2 (ERK1/2) activation, was assessed by quantitative real-time RT-PCR in vivo as well as in vitro experiments. Propranolol, administered at the dose of 10 mg/kg/day in C57BL/6 mice, caused a H 19-fold increase of Egr1 mRNA expression in left ventricular myocardium along with a H 2.1-fold increase of Egr1 protein expression. Isoproterenol, a nonselective ²-adrenoceptor agonist, also increased Egr1 mRNA and protein expression but to a lesser degree. Remarkably, isoproterenol administration was associated with the development of cardiac hypertrophy, whereas propranolol-treated mice showed a completely normal cardiac morphology. The effect of propranolol on Egr1 mRNA expression was abrogated in mice lacking ²1- and ²2-adrenoceptors indicating that propranolol increases Egr1 mRNA expression in a ²-adrenoceptor-dependent manner. The role of ²-adrenoceptors was further confirmed by showing that propranolol was able to increase Egr1 mRNA and protein levels in cultured neonatal cardiomyocytes. Collectively, these results indicate that propranolol promotes Egr1 gene expression in cardiomyocytes via ²-adrenoceptors with a mechanism which is independent of its ability to antagonize the effects of catecholamines. It is also suggested that cardiomyocyte growth and Egr1 gene overexpression are not obligate processes. (literal)
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