Please use this identifier to cite or link to this item: https://doi.org/10.1074/jbc.M200347200
Title: Phenotypic spectrum caused by transgenic overexpression of activated Akt in the heart
Authors: Matsui T.
Li N.
Wu J.C.
Cook S.A. 
Nagoshi T.
Picard M.H.
Liao R.
Rosenzweig A.
Issue Date: 2002
Publisher: ASBMB
Citation: Matsui T., Li N., Wu J.C., Cook S.A., Nagoshi T., Picard M.H., Liao R., Rosenzweig A. (2002). Phenotypic spectrum caused by transgenic overexpression of activated Akt in the heart. Journal of Biological Chemistry 277 (25) : 22896-22901. ScholarBank@NUS Repository. https://doi.org/10.1074/jbc.M200347200
Abstract: The serine-threonine kinase, Akt, inhibits cardiomyocyte apoptosis acutely both in vitro and in vivo. However, the effects of chronic Akt activation in the heart are unknown. To address this issue, we generated transgenic mice (TG+) with cardiac-specific expression of a constitutively active mutant of Akt (myr-Akt) driven by the myosin heavy chain-? promoter. Three TG+ founders (9-19 weeks) died suddenly with massive cardiac dilatation. Two viable TG+ lines (TG564 and TG20) derived from independent founders demonstrated cardiac-specific transgene expression as well as activation of Akt and p70S6 kinase. TG564 (n = 19) showed cardiac hypertrophy with a heart/body weight ratio 2.3-fold greater than littermates (n = 17, p < 0.005). TG20 (n = 18) had less marked cardiac hypertrophy with a heart/body weight ratio 1.6-fold greater than littermates (n = 17, p < 0.005). Isolated TG564 myocytes were also hypertrophic with surface areas 1.7-fold greater than littermates (p < 0.000001). Echocardiograms in both lines demonstrated concentric hypertrophy and preserved systolic function. After ischemia-reperfusion, TG+ had a 50% reduction in infarct size versus TG- (17 � 3% versus 34 � 4%, p < 0.001). Thus, chronic Akt activation is sufficient to cause a spectrum of phenotypes from moderate cardiac hypertrophy with preserved systolic function and cardioprotection to massive cardiac dilatation and sudden death.
Source Title: Journal of Biological Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/149288
ISSN: 219258
DOI: 10.1074/jbc.M200347200
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