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J Appl Physiol 90: 1219-1226, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 4, 1219-1226, April 2001

Effect of short-term exercise training on angiogenic growth factor gene responses in rats

Timothy P. Gavin and Peter D. Wagner

Department of Medicine, University of California San Diego, La Jolla, California 92093-0623

We investigated whether 1) 5 days of exercise training would reduce the acute exercise-induced increase in skeletal muscle growth factor gene expression; and 2) reductions in the increase in growth factor gene expression in response to short-term exercise training would be coincident with increases in skeletal muscle oxidative potential. Female Wistar rats were used. Six groups (rest; exercise for 1-5 consecutive days) were used to measure the growth factor response through the early phases of an exercise training program. Vascular endothelial growth factor (VEGF), transforming growth factor-beta 1 (TGF-beta 1), and basic fibroblast growth factor (bFGF) mRNA were analyzed from the left gastrocnemius by quantitative Northern blot. Citrate synthase activity was analyzed from the right gastrocnemius. VEGF and TGF-beta 1 mRNA increased after each of 5 days of exercise training, whereas exercise on any day did not increase bFGF mRNA. On day 1, the VEGF mRNA response was significantly greater than on days 2-5. However, the reduced increase in VEGF mRNA observed on days 2-5 was not coincident with increases in citrate synthase activity. These findings suggest that, in skeletal muscle, 1) VEGF and TGF-beta 1 mRNA are increased through 5 days of exercise training and 2) the reduced exercise-induced increase in VEGF mRNA responses on days 2-5 does not result from increases in oxidative potential.

vascular endothelial growth factor; transforming growth factor-beta 1; basic fibroblast growth factor; Northern analysis; citrate synthase activity


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