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Am J Physiol Heart Circ Physiol 279: H932-H938, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 3, H932-H938, September 2000

Fiber type-specific differential expression of angiogenic factors in response to chronic hindlimb ischemia

D. Hunter Cherwek1, M. Benjamin Hopkins1, Michael J. Thompson2, Brian H. Annex2,3, and Doris A. Taylor1,2,4

Departments of 2 Medicine, 1 Surgery, and 4 Biomedical Engineering, Duke University Medical Center; and 3 Division of Cardiology, Durham Veterans Affairs Medical Center, Durham, North Carolina 27710

Alterations in endogenous levels of the angiogenic proteins basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) were assessed in rabbit hindlimb muscles subjected to 1, 5, or 21 days of ischemia. In the glycolytic [tibialis anterior (TA)] and the oxidative [soleus (SOL)] muscles from the ischemic and contralateral (control) hindlimb, bFGF and VEGF protein expression was determined by ELISA and immunoblot analysis. Total VEGF protein expression was greater in oxidative than in glycolytic muscles after 5 days of hindlimb ischemia. In SOL muscle, total VEGF detected by ELISA in ischemic limbs was increased to 137, 300, and 220% of control at 1, 5, and 21 days, respectively. However, in TA, total VEGF expression by ELISA was increased only at 1 and 5 days of ischemia to 140 and 134% of control, respectively. By immunoblotting, the expression of the 165-amino acid isoform (VEGF165) was initially decreased to 55% of control in ischemic SOL at 1 day but was increased to 250% of control at day 5 and remained at 155% at day 21. In TA, VEGF165 was increased to 260% of control at 1 day of ischemia but only to 150% of control by day 5. The only significant change in bFGF expression in either the oxidative or glycolytic muscles was a small increase (129% of control) at 21 days in SOL. This study demonstrates that the magnitude and direction of change in VEGF protein expression depend on VEGF subtype, muscle fiber type, and duration of ischemia. These findings suggest that strategies in therapeutic angiogenesis may need to differ depending on muscle fiber type.

vascular endothelial growth factor; basic fibroblast growth factor; angiogenesis; skeletal muscle


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