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Department of Physiology and Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
Vascular endothelial growth factor (VEGF) has been implicated in angiogenesis induced by electrical stimulation in skeletal muscle. Less is known about the role of arachidonic acid metabolites in the control of growth of blood vessels in vivo. The present study examined the role of 20-hydroxyeicosatetraenoic acid (20-HETE) on the angiogenesis induced by electrical stimulation in skeletal muscle. The tibialis anterior and extensor digitorum longus muscles of rats were stimulated for 7 days. Electrical stimulation significantly increased the 20-HETE formation and angiogenesis in the muscles, which was blocked by chronic treatment with N-hydroxy-N'-(4-butyl-2-methylphenol)formamidine (HET0016) or 1-aminobenzotriazole (ABT). Chronic treatment with either HET0016 or ABT did not block the increases in VEGF protein expression in both muscles. To analyze the role of VEGF on 20-HETE formation, additional rats were treated with VEGF-neutralizing antibody (VEGF Ab). VEGF Ab blocked the increases of 20-HETE formation induced by stimulation. These results place 20-HETE in the downstream signaling pathway for angiogenesis and show that both VEGF and 20-HETE are involved in the angiogenesis induced by electrical stimulation in skeletal muscle.
vessel growth; vascular endothelial growth factor; electrical stimulation
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