Document Detail

The combined use of prostaglandin I2 analogue (OP-2507) and thromboxane A2 synthetase inhibitor (OKY-046) strongly inhibits atherosclerosis of aortic allografts in rats.
MedLine Citation:
PMID:  11331452     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Atherosclerosis is the main lesion in allografts undergoing chronic rejection. We investigated the effect of OP-2507 (prostaglandin I2 analogue) and OKY-046 (thromboxane A2 synthetase inhibitor) on graft atherosclerosis morphologically and the production of eicosanoids in grafts in a rat aortic allograft model. METHODS: Abdominal aortic allografts of Lewis (RT-1(l)) rats were transplanted orthotopically into fully major histocompatibility complex mismatched Wistar King A/Qdj (RT-1(u)) rats that were subcutaneously administered OP-2507 (0.1 mg/kg/d) or OKY-046 (125 mg/kg/d), or both, with an osmotic pump. Four, 8, or 12 weeks later, the grafts were harvested and examined histologically, and the concentration of eicosanoids in the grafts were analyzed. RESULTS: Lewis aortic allografts in Wistar King A recipients with no treatment displayed atherosclerosis, which involved gradual intimal thickening and medial thinning with continuous inflammation in adventitia. Neither OP-2507 nor OKY-046 treatment affected the intensity of adventitial inflammation. Although inhibition of medial thinning or a decrease in medial nuclear density was not observed, OKY-046 administration alone significantly inhibited an increase in intimal thickness. OP-2507 administration alone significantly inhibited a decrease in medial nuclear density and intimal thickening. Combined treatment with OP-2507 and OKY-046 further decreased the alteration of media and intima. The ratio of thromboxane B2 and 6-keto-prostaglandin F(1alpha) in the grafts was significantly reduced by OKY-046 but not by OP-2507 alone. CONCLUSIONS: We have demonstrated that atherosclerosis in aortic allografts is inhibited by the continuous administration of either OP-2507 or OKY-046, and a combination of both agents strongly increases this inhibitory effect. Amelioration of balance in eicosanoid production in the grafts by the use of thromboxane A2 synthetase inhibitor and the simultaneous usage of stable prostaglandin I2 analogue may be a strategy for preventing atherosclerosis that results from chronic rejection.
T Hirano; Y Nakafusa; R Kawano; K Motoyama; T Arima; A Sugitani; M Tanaka
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Surgery     Volume:  129     ISSN:  0039-6060     ISO Abbreviation:  Surgery     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-05-01     Completed Date:  2001-05-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417347     Medline TA:  Surgery     Country:  United States    
Other Details:
Languages:  eng     Pagination:  595-605     Citation Subset:  AIM; IM    
Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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MeSH Terms
6-Ketoprostaglandin F1 alpha / metabolism
Aorta / pathology,  transplantation*
Arteriosclerosis / drug therapy*,  enzymology,  prevention & control
Cell Nucleus / pathology
Drug Therapy, Combination
Enzyme Inhibitors / pharmacology*
Epoprostenol / analogs & derivatives,  pharmacology*
Methacrylates / pharmacology*
Rats, Inbred Lew
Rats, Wistar
Superoxides / metabolism
Thromboxane A2 / metabolism
Thromboxane-A Synthase / antagonists & inhibitors*
Transplantation, Homologous
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Methacrylates; 11062-77-4/Superoxides; 35121-78-9/Epoprostenol; 57576-52-0/Thromboxane A2; 58962-34-8/6-Ketoprostaglandin F1 alpha; 72520-05-9/OP 2507; 82571-53-7/ozagrel; EC Synthase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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