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Beneficial effect of proteases on allograft arteriosclerosis in a rat aortic model

 Gaciong Z.1, Paczek L.1, Bojakowski K.1, Socha K.1, Wisniewski M.2 and Heidland A.3

1Transplantation Institute and 2Department of Dental Surgery, Warsaw School of Medicine, Warsaw, Poland, and 3Department of Internal Medicine, University of Wurzburg, Wurzburg, Germany

Nephrol Dial Transplant 1996, Vol. 11, No. 6, pp. 987-989.

SO 108 (17-09-2)

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Abstract

Recently it has been shown that protease therapy ameliorates certain immune-mediated diseases. Thus we studied the effect of administration of a protease mixture on aortic transplant arteriosclerosis in rats. Segments of abdominal aorta from SHR strain were transplanted orthotopically into WKY recipients. Two groups of allografted rats were used. One group (n=8) was treated with daily intraperitoneal injections of 12 mg of a protease formulation containing trypsin, bromelain and rutosid, and another group (n=8) with placebo. Eight WKY rats were transplanted with syngenic aortas and treated with placebo. After 8 weeks, structural changes of the grafted segment were evaluated by morphometric analysis of formalin-fixed sections with specific stains. In untreated allografts there was a marked intimal thickening, medial necrosis with disruption of elastic fibres, and inflammatory infiltrates in the adventitia. Administration of proteases inhibited formation of neointima by 59.0% when cross-sectional areas were compared (80±11 versus 195±11 mm2, P<0.01; protease-versus placebo-treated allograft recipients respectively) and decreased medial injury as estimated by the integrity of elastic fibres and smooth-muscle cell density. Thus, in an experimental model of rat aortic allograft, protease administration ameliorates rejection-induced arterial wall remodelling.

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