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J Thorac Cardiovasc Surg 1996;111:1230-1239
© 1996 Mosby, Inc.

CARDIAC AND PULMONARY REPLACEMENT

CARDIAC ALLOGRAFT VASCULOPATHY IN PARTIALLY INBRED MINIATURE SWINE. I. TIME COURSE, PATHOLOGY, AND DEPENDENCE ON IMMUNE MECHANISMS

From the Cardiac Surgical Unit and Transplantation Biology Research Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Mass.

Received for publication May 18, 1995; Accepted for publication July 26, 1995. Address for reprints: Joren C. Madsen, MD, DPhil, Department of Surgery, Massachusetts General Hospital, 55 Fruit St., Boston, MA 02114.

Abstract

To assess the role of the immune system in cardiac allograft vasculopathy in large animals, heterotopic heart transplantation was done between partially inbred miniature swine, animals in which transplantation can be done across defined major histocompatibility barriers in a reproducible fashion. Porcine hearts transplanted into untreated recipients across a class I, class II, or full major histocompatibility mismatch were acutely rejected in 6 to 8 days (n= 4). Hearts transplanted into untreated recipients across minor histocompatibility barriers survived for 21 to 44 days (n= 5) and showed no evidence of cardiac allograft vasculopathy. When recipients were treated with a 12-day course of cyclosporine, hearts transplanted across minor histocompatibility barriers survived 42, 64, and 56 days and did not develop vascular lesions. However, hearts transplanted into cyclosporine-treated recipients across a full major histocompatibility disparity survived 20, 22, and 23 days and all three developed biopsy-proven vasculopathy. In one animal, the progression of intimal proliferation was followed in vivo by intracoronary ultrasonography. The degree of intimal thickening documented by ultrasonography correlated well with the intimal proliferation found on tissue histologic samples. These results are the first to show that in large animals, an immune response stimulated by donor major histocompatibility antigens is involved in the induction of cardiac allograft vasculopathy. In addition, these studies point out the utility of a large-animal model of cardiac allograft vasculopathy in which transplantation across defined major histocompatibility barriers can be done reproducibly and in which accurate determinations of the progression or regression of coronary vascular lesions in individual animals can be accurately assessed in vivo. (J THORACCARDIOVASCSURG1996;111:1230-9)

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