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Clin Transplant. 2001 Aug;15(4):228-35.

Intragraft cytokine expression in heart transplants with mild or no histological rejection.

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  • 1Grupo de Inmunología Celular e Inmunogenética, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia.

Abstract

The study of pro-inflammatory cytokines produced in situ in heart allografts may help to understand the mechanisms of rejection and open new possibilities to control graft rejection.

METHODS:

A total of 23 endomyocardial biopsies obtained from 16 transplanted patients treated with triple-drug therapy (azathioprine, prednisone, and cyclosporine) were studied. mRNA expression for tumor necrosis factor (TNF)-alpha, interleukin (IL)-1 beta, IL-6, IL-10, IL-12, IL-15, transforming growth factor (TGF)-beta, and beta-actin was determined by reverse transcription polymerase chain reaction (RT-PCR) and Southern blotting. Semiquantitative analysis was done by establishing the ratio between densitometric integrated value of each cytokine with the beta-actin and correlated with the histopathologic findings.

RESULTS:

Three groups of biopsies were determined according to the International Society for Heart and Lung Transplantation criteria: grade 0 (control group, n=12), grade 1A (sub-clinical rejection, n=6) and 'quilty effect' (n=5). An increased expression of mRNA for TNF-alpha and IL-6 (p=0.0091 and 0.0075, respectively) was found associated with rejection grade 1A episodes, mRNA for IL-1 beta was nonspecifically expressed in all the study groups, while IL-10 mRNA was not detected in any of the biopsies studied. mRNA for IL-12 and IL-15 was not associated with rejection. Interestingly, TGF-beta was not detected in any of the biopsies with the 'quilty pattern'.

CONCLUSION:

The association of TNF-alpha and IL-6 mRNA in situ expression with mild histologically probed rejection episodes may be used in the monitoring of heart transplants.

PMID:
11683815
[PubMed - indexed for MEDLINE]
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