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1 Department of Physiology, University of Manitoba, Winnipeg, Manitoba, R3E 3J7; and 2 Department of Human Anatomy and Cell Science, Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre, Winnipeg, Manitoba, Canada R2H 2A6
We generated transgenic (TG)
mice overexpressing fibroblast growth factor (FGF)-2 protein (22- to
34-fold) in the heart. Chronic FGF-2 overexpression revealed no
significant effect on heart weight-to-body weight ratio or expression
of cardiac differentiation markers. There was, however, a significant
20% increase in capillary density. Although there was no change in FGF
receptor-1 expression, relative levels of phosphorylated c-Jun
NH2-terminal kinase and p38 kinase as well as of
membrane-associated protein kinase C (PKC)-
and total PKC-
were
increased in FGF-2-TG mouse hearts. An isolated mouse heart model of
ischemia-reperfusion injury was used to assess the potential of
increased endogenous FGF-2 for cardioprotection. A significant
34-45% increase in myocyte viability, reflected in a decrease in
lactate dehydrogenase released into the perfusate, was observed in
FGF-2 overexpressing mice and non-TG mice treated exogenously with
FGF-2. In conclusion, FGF-2 overexpression causes augmentation of
signal transduction pathways and increased resistance to ischemic
injury. Thus, stimulation of endogenous FGF-2 expression offers a
potential mechanism to enhance cardioprotection.
fibroblast growth factor; transgenic mice; cardioprotection; Langendorff preparation
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