CIP4 is required for the hypertrophic growth of neonatal cardiac myocytes.

Abstract:

BACKGROUND:CIP4 is a scaffold protein that regulates membrane deformation and tubulation, organization of the actin cytoskeleton, endocytosis of growth factor receptors, and vesicle trafficking. Although expressed in the heart, CIP4 has not been studied with regards to its potential function in cardiac myocytes. RESULTS:We now show using RNA interference that CIP4 expression in neonatal rat ventricular myocytes is required for the induction of non-mitotic, hypertrophic growth by the α-adrenergic agonist phenylephrine, the IL-6 cytokine leukemia inhibitor factor, and fetal bovine serum, as assayed using morphometry, immunocytochemistry for the hypertrophic marker atrial natriuretic factor and [3H]leucine incorporation for de novo protein synthesis. This requirement was consistent with the induction of CIP4 expression by hypertrophic stimulation. The inhibition of myocyte hypertrophy by CIP4 small interfering oligonucleotides (siRNA) was rescued by expression of a recombinant CIP4 protein, but not by a mutant lacking the N-terminal FCH domain responsible for CIP4 intracellular localization. CONCLUSIONS:These results imply that CIP4 plays a significant role in the intracellular hypertrophic signal transduction network that controls the growth of cardiac myocytes in heart disease.

journal_name

J Biomed Sci

authors

Rusconi F,Thakur H,Li J,Kapiloff MS

doi

10.1186/1423-0127-20-56

subject

Has Abstract

pub_date

2013-08-03 00:00:00

pages

56

eissn

1021-7770

issn

1423-0127

pii

1423-0127-20-56

journal_volume

20

pub_type

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