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Departments of 1Exercise and Sport Science, 2Physiology, and 3Surgery, East Carolina University, Greenville, North Carolina 27858
Submitted 18 July 2003 ; accepted in final form 28 August 2003
We investigated whether acute systemic exercise increases vascular endothelial growth factor (VEGF), VEGF receptor (KDR and Flt-1) mRNA, and VEGF protein in sedentary humans. Twelve sedentary subjects were recruited and performed 1 h of acute, cycle ergometer exercise at 50% of maximal oxygen consumption. Muscle biopsies were obtained from the vastus lateralis before exercise and at 0, 2, and 4 h postexercise. Acute exercise significantly increased VEGF mRNA at 2 and 4 h and increased KDR and Flt-1 mRNA at 4 h postexercise. The sustained increase in VEGF mRNA through 4 h and the increases in KDR and Flt-1 at 4 h are different from their respective time course responses in rats. In contrast to the increase in VEGF mRNA postexercise, VEGF protein levels were decreased at 0 h postexercise. These results provide evidence in humans that 1) VEGF, KDR, and Flt-1 mRNA are increased by acute systemic exercise; 2) the time course of the VEGF, KDR, and Flt-1 mRNA responses are different from those previously reported in rats (Gavin TP and Wagner PD. Acta Physiol Scand 175: 201209, 2002); and 3) VEGF protein is decreased immediately after exercise.
KDR; Flt-1; skeletal muscle capillary supply; time course; vascular endothelial growth factor
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