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Department of Medicine, University of California San Diego, La Jolla, California 92093-0623
Acute exercise increases vascular
endothelial growth factor (VEGF), transforming growth
factor-
1 (TGF-
1), and basic fibroblast growth factor (bFGF) mRNA levels in skeletal muscle, with the greatest
increase in VEGF mRNA. VEGF functions via binding to the VEGF receptors
Flk-1 and Flt-1. Captopril, an angiotensin-converting enzyme inhibitor,
has been suggested to reduce the microvasculature in resting and
exercising skeletal muscle. However, the molecular mechanisms
responsible for this reduction have not been investigated. We
hypothesized that this might occur via reduced VEGF,
TGF-
1, bFGF, Flk-1, and Flt-1 gene expression at rest
and after exercise. To investigate this, 10-wk-old female Wistar rats
were placed into four groups (n = 6 each): 1) saline + rest; 2) saline + exercise; 3) 100 mg/kg ip
captopril + rest; and 4) 100 mg/kg ip captopril + exercise. Exercise consisted of 1 h of running at 20 m/min on a 10°
incline. VEGF, TGF-
1, bFGF, Flk-1, and Flt-1 mRNA were analyzed from the left gastrocnemius by quantitative Northern blot.
Exercise increased VEGF mRNA 4.8-fold, TGF-
1 mRNA
1.6-fold, and Flt-1 mRNA 1.7-fold but did not alter bFGF or Flk-1 mRNA
measured 1 h after exercise. Captopril did not affect the rest or
exercise levels of VEGF, TGF-
1, bFGF, and Flt-1 mRNA.
Captopril did reduce Flk-1 mRNA 30-40%, independently of
exercise. This is partially consistent with the suggestion that
captopril may inhibit capillary growth.
vascular endothelial growth factor; basic fibroblast growth factor; transforming growth factor-
1; Flk-1; Flt-1
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