Abstract
The immune response to an allograft is regulated by cytokines produced by cells infiltrating the allograft. However, the immunopathogenesis of allograft rejection is not completely understood. To investigate the role of cytokines after clinical heart transplantation, we analysed the expression of cytokine genes in sequentially taken endomyocardial biopsies (EMB) by using the reverse transcriptase-polymerase chain reaction (RT-PCR). We analysed 44 EMB from 11 recipients: 21 EMB before or during rejection, and 23 EMB without histological evidence of acute rejection. A strong correlation was found between IL-2 gene expression and histologically proved rejection (16/21 versus 1/23 without rejection, P < 0.001; chi 2 test). Also, expression of IL-4 and IL-6 genes was more often found in EMB during rejection than in EMB without signs of rejection (IL-4, 62% versus 35%; and IL-6, 81% versus 39%, respectively). No relation with rejection or with immunological quiescence was observed for the presence of IL-10 gene transcripts. IL-10, but also IL-6 mRNA were detectable in donor heart tissue before transplantation (9/10). In contrast, IL-2 and IL-4 gene transcripts were absent in these samples. These differences could not be explained by the presence or absence of T cells, since the gene for the constant region of the beta-chain (C beta) of the T cell receptor (TCR) not only was expressed in post-transplant EMB but also in pre-transplant donor heart tissue. Our results provide strong evidence that the immunoregulatory cytokines IL-2, IL-4 and IL-6 are important local regulators in the graft during acute rejection. The role of IL-10 in the immunologic response to the transplanted organ needs further investigation.
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