CD40 and CD40 ligand (CD154) are coexpressed on microvessels in vivo in human cardiac allograft rejection

Transplantation
R M ReulD M Briscoe

Abstract

CD40 is expressed by a wide variety of cells in the immune system, including endothelial cells. It binds to CD40 ligand ([CD40L] CD154), which was originally reported to be restricted in its expression to early-activated T cells. We report here the expression of CD40 and CD40L in human cardiac allografts. A total of 123 consecutive biopsies from 11 human cardiac allograft recipients were analyzed by immunohistochemistry for the expression of CD40 and CD40L. The expression of CD40L was also examined in vitro in homogeneous cultures of umbilical vein endothelial cells by reverse transcriptase-polymerase chain reaction and by flow cytometry. CD40 was expressed at low levels, and CD40L was minimal or absent in histologically normal biopsies in the absence of CD3+ T-cell infiltrates. In rejection, the expression of CD40 increased on vascular endothelial cells and on graft-infiltrating leukocytes throughout biopsy specimens. Induced expression of CD40 was strongly associated with the presence of CD3+ T-cell infiltrates, acute rejection, and ischemic injury (P<0.05). CD40L was expressed in biopsies with rejection and was prominent on a subset of infiltrating leukocytes as well as on microvascular endothelial cells. In contrast to CD40...Continue Reading

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