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EMBO J. 2000 Jun 1;19(11):2537-48.

The conserved phosphoinositide 3-kinase pathway determines heart size in mice.

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  • 1Cardiovascular Division, Beth Israel Deaconess Medical Center and Departments of Medicine and Cell Biology, Harvard Medical School, Boston, MA 02215, USA.

Abstract

Phosphoinositide 3-kinase (PI3K) has been shown to regulate cell and organ size in Drosophila, but the role of PI3K in vertebrates in vivo is not well understood. To examine the role of PI3K in intact mammalian tissue, we have created and characterized transgenic mice expressing constitutively active or dominant-negative mutants of PI3K in the heart. Cardiac- specific expression of constitutively active PI3K resulted in mice with larger hearts, while dominant-negative PI3K resulted in mice with smaller hearts. The increase or decrease in heart size was associated with comparable increase or decrease in myocyte size. Cardiomyopathic changes, such as myocyte necrosis, apoptosis, interstitial fibrosis or contractile dysfunction, were not observed in either of the transgenic mice. Thus, the PI3K pathway is necessary and sufficient to promote organ growth in mammals.

PMID:
10835352
PMCID:
PMC212739
DOI:
10.1093/emboj/19.11.2537
[PubMed - indexed for MEDLINE]
Free PMC Article
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