Summary
We have examined the expression of two nuclear-acting oncogenes, c-fos and c-myc in the rat heart following administration of hormones implicated in the development of cardiac hypertrophy. A single injection of norepinephrine (2.5 μg/kg to 2.5 mg/kg) led to transient increases in the levels of both c-fos and c-myc mRNA. The response was sequential: elevated levels of c-fos mRNA were first observed 15 min after treatment and peaked at 1 h whilst c-myc mRNA levels increased 30 min after treatment and peaked at 2h. The response of both cellular oncogenes to norepinephrine was reduced significantly by a blockade but (3 blockade was less effective. Administration of triiodo-L-thyronine (0.25 mg/kg), a level known to promote cardiac hypertrophy, did not produce elevated levels of c-fos or c-myc mRNA. In an initial study, it was possible to demonstrate induction of c-fos and c-myc in rat hearts perfused in vitro with medium containing 2x10−7 M norepinephrine. These results provide support for the notion that c-fos and c-myc expression may play a transducing role in the development of adrenergic-mediated, but not thyroid hormone-mediated cardiac hypertrophy.
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Hannan, R.D., West, A.K. Adrenergic agents, but not triiodo-L-thyronine induce c-fos and c-myc expression in the rat heart. Basic Res Cardiol 86, 154–164 (1991). https://doi.org/10.1007/BF02190548
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DOI: https://doi.org/10.1007/BF02190548