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Renin gene transfer restores angiogenesis and vascular endothelial growth factor expression in Dahl S rats. Hypertension 2001 Feb;37(2 Pt 2):386-90 PMID: 11230305

Abstract

In a previous study, we demonstrated that Dahl S rats (SS group) have low plasma renin activity, whereas transfer of a region of chromosome 13 containing the renin gene from Dahl R onto a congenic strain of Dahl SS/Jr/Hsd/MCW rats (S/ren(RR) group) restores renin secretory responses. In the present study, we compared the angiogenic responses to electrical stimulation in the SS and S/ren(RR) groups to explore the hypotheses that the renin-angiotensin system is involved in vascular endothelial growth factor (VEGF) expression and angiogenesis in skeletal muscle. Congenic SS and S/ren(RR) rats fed a 0.4% or 4% salt diet were surgically prepared by chronic implantation of an electrical stimulator. Another group of S/ren(RR) rats was treated with lisinopril 2 days before the surgery and throughout the stimulation protocol. The right tibialis anterior (TA) and extensor digitorum longus (EDL) were stimulated for 8 hours per day for 7 days. The contralateral muscles served as controls. Western blot analysis was performed to identify VEGF protein expression in these muscles. Electrical stimulation produced no change in vessel density of the SS group fed a 0.4% salt diet (change 5.50% and 8.14% for EDL and TA, respectively). Transfer of a region containing the renin gene restored the angiogenic response (change 16% and 30% for EDL and TA, respectively) despite a significantly higher blood pressure. Blockade of the renin-angiotensin system by lisinopril or high salt restored the responses observed in the SS group fed a low salt diet. In addition, increases in VEGF expression to electrical stimulation were observed only in the S/ren(RR) group fed a low salt diet. These results suggest that renin gene transfer restores angiogenesis and VEGF expression in the skeletal muscle of Dahl S rats.

Author List

Amaral SL, Roman RJ, Greene AS

Author

Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angiotensin-Converting Enzyme Inhibitors
Animals
Blood Pressure
Blotting, Western
Body Weight
Electric Stimulation
Endothelial Growth Factors
Gene Transfer Techniques
Lisinopril
Lymphokines
Muscle, Skeletal
Neovascularization, Physiologic
Organ Size
Rats
Rats, Inbred Dahl
Renin
Renin-Angiotensin System
Sodium, Dietary
Tibia
Vascular Endothelial Growth Factor A
Vascular Endothelial Growth Factors



View this publication's entry at the Pubmed website PMID: 11230305
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