The conserved phosphoinositide 3-kinase pathway determines heart size in mice.
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.
Duke Scholars
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- Ventricular Function, Left
- Signal Transduction
- Ribosomal Protein S6 Kinases
- Recombinant Fusion Proteins
- Protein Processing, Post-Translational
- Phosphorylation
- Phosphatidylinositol 3-Kinases
- Organ Size
- Myosin Heavy Chains
- Myocardium
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Ventricular Function, Left
- Signal Transduction
- Ribosomal Protein S6 Kinases
- Recombinant Fusion Proteins
- Protein Processing, Post-Translational
- Phosphorylation
- Phosphatidylinositol 3-Kinases
- Organ Size
- Myosin Heavy Chains
- Myocardium