R. Foncea et al., Extracellular regulated kinase, but not protein kinase C, is an antiapoptotic signal of insulin-like growth factor-1 on cultured cardiac myocytes, BIOC BIOP R, 273(2), 2000, pp. 736-744
Citations number
58
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
This study aims to elucidate the signaling pathway for insulin-like growth
factor-1 (IGF-1) in cultured neonatal rat cardiomyocytes and particularly t
he role of IGF-1 in cardiac apoptosis, IGF-1 stimulated polyphosphoinositid
e turnover, translocation of protein kinase C (PKC) isoforms (alpha, epsilo
n, and delta) from the soluble to the particulate fraction, activation of p
hospholipid-dependent and Ca2+-, phospholipid-dependent PKC, and activation
of the extracellular-regulated kinase (ERK), IGF-1 attenuated sorbitol-ind
uced cardiomyocyte viability and nuclear DNA fragmentation, These antiapopt
otic effects of IGF-1 were blocked by PD098059 (an MEK inhibitor) but not b
y bisindolylmaleimide I (BIM, a specific PKC inhibitor), The ERK pathway ma
y therefore be an important component in the mechanism whereby IGF-1 exerts
its antiapoptotic effect on the cardiomyocyte, (C) 2000 Academic Press.