Reduction of experimental vein graft intimal hyperplasia and preservation of nitric oxide-mediated relaxation by the nitric oxide precursor L-arginine

M. G. Davies, J. H. Kim, H. Dalen, R. G. Makhoul, E. Svendsen, P. O. Hagen

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

Background. Previous studies in animals and human beings have shown that vein bypass grafts exhibit diminished endothelium-dependent relaxation and the development of intimal hyperplasia. This study examines the effect of L- arginine on experimental vein graft endothelial cell function and the development of intimal hyperplasia. Methods. Common carotid vein bypass grafts were performed in 24 New Zealand White rabbits: 12 were controls and 12 received L-arginine (2.25%) orally 7 days before operation and thereafter until harvest, 28 days after operation. Intimal and medial dimensions were determined by planimetry on pressure-fixed vessels. Relaxation to acetylcholine, serotonin, calcium ionophore (A23187), and sodium nitroprusside was performed on precontracted vessel rings. Results. Arginine- treated vein grafts showed a 47% reduction in mean intimal thickness (p < 0.001) compared with controls. By scanning and transmission electron microscopy, all vein grafts showed a confluent endothelium. In contrast to control grafts, which do not relax to acetylcholine and serotonin, arginine- treated vein grafts relaxed in response to both agonists. There was a significant increase (p < 0.05) in the maximal relaxation to calcium ionophore (A23187) in arginine-treated vein grafts compared with control grafts. Non-endothelium-dependent responses to sodium nitroprusside were equivalent in all vein grafts. Conclusions. This study shows that oral L- arginine supplementation significantly reduces intimal hyperplasia and preserves nitric oxide-mediated relaxation in experimental vein grafts, suggesting a role for nitric oxide in the regulation of the cellular events that lead to intimal hyperplasia.

Original languageEnglish (US)
Pages (from-to)557-568
Number of pages12
JournalSurgery
Volume116
Issue number3
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Surgery

Fingerprint Dive into the research topics of 'Reduction of experimental vein graft intimal hyperplasia and preservation of nitric oxide-mediated relaxation by the nitric oxide precursor L-arginine'. Together they form a unique fingerprint.

  • Cite this