Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 25, Issue 21, Pages 9491-9502Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.25.21.9491-9502.2005
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Funding
- NCI NIH HHS [P01 CA089021, CA 089021] Funding Source: Medline
- NHLBI NIH HHS [R01 HL065742, R01 HL 65742] Funding Source: Medline
- NIGMS NIH HHS [GM 41890, R37 GM041890, R01 GM041890] Funding Source: Medline
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Class I-A phosphoinositide 3-kinases (PI3Ks) are activated by growth factor receptors, and they regulate, among other processes, cell growth and organ size. Studies using transgenic mice overexpressing constitutively active and dominant negative forms of the p110 alpha catalytic subunit of class I-A PI3K have implicated the role of this enzyme in regulating heart size and physiological cardiac hypertrophy. To further understand the role of class I-A PI3K in controlling heart growth and to circumvent potential complications from the overexpression of dominant negative and constitutively active proteins, we generated mice with muscle-specific deletion of the p85 alpha regulatory subunit and germ line deletion of the p85 beta regulatory subunit of class I-A PI3K. Here we show that mice with cardiac deletion of both p85 subunits exhibit attenuated Akt signaling in the heart, reduced heart size, and altered cardiac gene expression. Furthermore, exercise-induced cardiac hypertrophy is also attenuated in the p85 knockout hearts. Despite such defects in postnatal developmental growth and physiological hypertrophy, the p85 knockout hearts exhibit normal contractility and myocardial histology. Our results therefore provide strong genetic evidence that class I-A PI3Ks are critical regulators for the developmental growth and physiological hypertrophy of the heart.
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