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The Journal of Immunology, Vol 150, Issue 3 1093-1104, Copyright © 1993 by American Association of Immunologists
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PJ O'Connell, A Pacheco-Silva, PW Nickerson, RA Muggia, M Bastos, VR Kelley and TB Strom
Harvard Medical School, Department of Medicine, Beth Israel Hospital, Boston, MA 02215.
Polymerase chain reaction-assisted reverse transcription was used to study the temporal course of rejection in unmodified recipients of murine pancreatic islet cell allografts (DBA/2-->B6AF1) by using syngeneic tissues as controls. The histologic appearance of the grafts was analyzed in parallel. Preproinsulin and constant region of the TCR- beta chain transcripts were studied as markers of graft integrity and infiltrating T cell mass, respectively. The participation of certain cytokines and CTL were analyzed by the detection of IL-2, IFN-gamma, IL- 4, and CTL-specific serine protease (granzyme B) transcripts. The time- related disappearance of intragraft preproinsulin transcripts correlated with graft destruction, whereas the intensity of intragraft TCR-beta chain transcript levels correlated with the magnitude of mononuclear leukocyte infiltration in allografts. In unmodified allografts, the magnitude of IL-2 and IFN-gamma intragraft mRNA levels correlated with the intense mononuclear leukocyte infiltrate found on histologic examination at day 8. Only after stable IL-2 gene transcription on day 8 does evidence of graft destruction become apparent, indicating that IL-2 gene activation is closely related to and probably required for expression of alloimmune cytopathic processes. In contrast, IL-4 transcripts were absent or detected in low copy number throughout this time course. Intragraft expression of granzyme B mRNA, a CTL-specific transcript, peaked from day 8 to day 12 in allografts compared with syngeneic grafts or normal tissue. In syngeneic grafts IL-2 and/or IL-4 mRNA was essentially not detected. Although IFN-gamma and granzyme B transcripts were detected in syngeneic grafts, after 4 days the levels of detected transcripts were far less than those noted in allografts. In vivo detection of intragraft IL-2 transcripts in the relative absence of detectable IL-4 transcripts strongly suggests IL-2-dependent immune effector mechanisms are associated with, and perhaps responsible, for allograft rejection. Apparently IL-4-dependent effector mechanisms are not necessary for allograft rejection.
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