Abstract | OBJECTIVES: MATERIALS: Forty New Zealand white rabbits underwent jugular vein interposition grafting of the common carotid artery. DESIGN: Ten animals were controls, 10 animals had the outer surface of the vein graft coated with 30% pluronic gel (2.5 ml), and 10 each were immersed for 15 min prior to insertion in Ringer lactate containing 10(-3) M of SNAP or L-NAME and then had their vein grafts coated with 2.5 ml of gel containing either SNAP (10(-3) M) or L-NAME (10(-3) M), which allows for sustained delivery for up to 6 h. On the 28th post operative day, the animals were sacrificed and vein grafts were harvested for morphology by electron microscopy (SEM and TEM) and dimensional analysis by videomorphometry. RESULTS: All vein grafts developed intimal hyperplasia. On SEM the vein grafts had a confluent layer of endothelial cells with multiple layers of smooth muscle cells representing intimal hyperplasia in TEM. There were no demonstrable morphological differences between the four groups. Local treatment with SNAP produced a significant 36% decrease in mean intimal thickness (72 +/- 4 microns vs. 45 +/- 4 microns; mean +/- S.E.M.; p < 0.01) without a change in medial thickness compared to gel-only treated groups (58 +/- 6 microns vs. 61 +/- 7 microns; p = ns). Inhibition of NO synthase by L-NAME had no effect on the development of intimal hyperplasia (72 +/- 4 microns vs. 79 +/- 10 microns; p = ns); medial thickness was also unchanged. CONCLUSION: These data confirm the protective effect of NO in vascular injury and suggest that NO synthase activity is either absent or reduced to such a level that further inhibition in this short time course is not relevant to the pathophysiology of vein graft intimal hyperplasia.
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Authors | G J Fulton, M G Davies, L Barber, J L Gray, E Svendsen, P O Hagen |
Journal | European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery
(Eur J Vasc Endovasc Surg)
Vol. 15
Issue 4
Pg. 279-89
(Apr 1998)
ISSN: 1078-5884 [Print] England |
PMID | 9610339
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
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Chemical References |
- S-nitro-N-acetylpenicillamine
- Collagen
- Penicillamine
- NG-Nitroarginine Methyl Ester
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Topics |
- Animals
- Carotid Artery, Common
(surgery)
- Cell Division
(drug effects)
- Cells, Cultured
(drug effects)
- Collagen
(biosynthesis, drug effects, ultrastructure)
- Cytoplasm
(drug effects, ultrastructure)
- Endothelium, Vascular
(drug effects, ultrastructure)
- Female
- Hyperplasia
(chemically induced)
- Microscopy, Electron, Scanning
- Muscle, Smooth, Vascular
(drug effects, ultrastructure)
- NG-Nitroarginine Methyl Ester
(administration & dosage)
- Penicillamine
(administration & dosage, analogs & derivatives)
- Rabbits
- Vascular Patency
- Veins
(pathology, transplantation)
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