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1Division of Cardiology, Salt Lake City Veterans Affairs Medical Center, Salt Lake City 84148; and 2Division of Cardiology, 3Division of Endocrinology, Metabolism, and Diabetes, and 4Program in Human Molecular Biology and Genetics, The University of Utah, Salt Lake City, Utah 84132
Submitted 4 February 2003 ; accepted in final form 21 May 2003
We developed a minimally invasive method for producing left ventricular
(LV) pressure overload in mice. With the use of this technique, we quickly and
reproducibly banded the transverse aorta with low surgical morbidity and
mortality. Minimally invasive transverse aortic banding (MTAB) acutely and
chronically increased LV systolic pressure, increased heart weight-to-body
weight ratio, and induced myocardial fibrosis. We used this technique to
determine whether reduced insulin signaling in the heart altered the cardiac
response to pressure overload. Mice with cardiac myocyte-restricted knockout
of the insulin receptor (CIRKO) have smaller hearts than wild-type (WT)
controls. Four weeks after MTAB, WT and CIRKO mice had comparably increased LV
systolic pressure, increased cardiac mass, and induction of mRNA for
-myosin heavy chain and atrial natriuretic factor. However, CIRKO hearts
were more dilated, had depressed LV systolic function by echocardiography, and
had greater interstitial fibrosis than WT mice. Expression of connective
tissue growth factor was increased in banded CIRKO hearts compared with WT
hearts. Thus lack of insulin signaling in the heart accelerates the transition
to a more decompensated state during cardiac pressure overload. The use of the
MTAB approach should facilitate the study of the pathophysiology and treatment
of pressure-overload hypertrophy.
hypertrophy; contractility; fibrosis
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