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. 1991 Apr;138(4):791–798.

Human coronary transplantation-associated arteriosclerosis. Evidence for a chronic immune reaction to activated graft endothelial cells.

R N Salomon 1, C C Hughes 1, F J Schoen 1, D D Payne 1, J S Pober 1, P Libby 1
PMCID: PMC1886118  PMID: 2012171

Abstract

Occlusive disease of coronary arteries of engrafted hearts is the major obstacle to long-term survival of human cardiac allografts. The pathogenesis of this process remains uncertain. The identity and localization of cells found in transplantation-associated arteriosclerosis lesions from human cardiac allografts were evaluated, and their expression of class II major histocompatibility complex (human leukocyte antigen-DR [HLA-DR]), surface molecules required for recognition of foreign cells by CD4+ T lymphocytes, was noted. Expanded intimas of transplanted coronary arteries contain T lymphocytes (both CD4+ and CD8+ in approximately equal number) and HLA-DR+ macrophages, both localized primarily in a ring immediately below the luminal endothelium, a distribution strikingly different from that in typical atherosclerosis. Coronary arterial endothelium from six of six transplanted hearts studied bore high levels of HLA-DR. Normal human arteries or usual atherosclerotic lesions have few if any HLA-DR+ endothelial cells. The significance of these findings was tested by evaluating the ability of HLA-DR+ arterial cells to interact with allogeneic T cells in vitro. Endothelial cells (but not smooth muscle cells) cultured from human arteries stimulated foreign CD4+ T cells to proliferate and augmented their secretion of interleukin-2. These findings suggest that ongoing stimulation of recipient T lymphocytes by HLA-DR+ endothelium of donor coronary arteries contributes to a sustained regional immune response. Consequent local release of cytokines may regulate smooth muscle cell proliferation and matrix accumulation within the coronary arteries of allografted hearts.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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