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. 1997 Oct 15;100(8):1991–1999. doi: 10.1172/JCI119730

Overexpression of insulin-like growth factor-1 in mice protects from myocyte death after infarction, attenuating ventricular dilation, wall stress, and cardiac hypertrophy.

Q Li 1, B Li 1, X Wang 1, A Leri 1, K P Jana 1, Y Liu 1, J Kajstura 1, R Baserga 1, P Anversa 1
PMCID: PMC508388  PMID: 9329962

Abstract

To determine whether IGF-1 opposes the stimulation of myocyte death in the surviving myocardium after infarction, transgenic mice overexpressing human IGF-1B in myocytes (FVB.Igf+/-) and wild-type littermates at 1.5 and 2.5 mo of age were subjected to coronary ligation and killed 7 d later. Myocardial infarction involved an average 50% of the left ventricle, and produced cardiac failure. In the region proximate to infarction, myocyte apoptosis increased 4. 2-fold and 2.1-fold in nontransgenics at 1.5 and 2.5 mo, respectively. Corresponding increases in myocyte necrosis were 1. 8-fold and 1.6-fold. In contrast, apoptotic and necrotic myocyte death did not increase in FVB.Igf+/- mice at either age after infarction. In 2.5-mo-old infarcted nontransgenics, functional impairment was associated with a 29% decrease in wall thickness, 43% increase in chamber diameter, and a 131% expansion in chamber volume. Conversely, the changes in wall thickness, chamber diameter, and cavitary volume were 41, 58, and 48% smaller in infarcted FVB.Igf+/- than in nontransgenics. The differential response to infarction of FVB.Igf+/- mice resulted in an attenuated increase in diastolic wall stress, cardiac weight, and left and right ventricular weight-to-body wt ratios. In conclusion, constitutive overexpression of IGF-1 prevented activation of cell death in the viable myocardium after infarction, limiting ventricular dilation, myocardial loading, and cardiac hypertrophy.

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Selected References

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