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The Journal of Immunology, Vol 156, Issue 9 3493-3500, Copyright © 1996 by American Association of Immunologists

ARTICLES

Restricted V beta usage by T cells infiltrating rejecting human lung allografts

LA DeBruyne, JP Lynch 3rd, LA Baker, R Florn, GM Deeb, RI Whyte and DK Bishop
Transport Immunology Research Laboratory, Department of Surgery, University of Michigan School of Medicine, Ann Arbor 48109, USA.

TCR expression was evaluated in lung transplant patients to determine whether T cells infiltrating rejecting lung allografts employed restricted V beta elements. Serial bronchoalveolar lavage (BAL) specimens were obtained from six lung transplant recipients at approximately 3 wk, 6 wk, and 3 mo post-transplant. T cell lines were established by culturing lavage cells with irradiated donor splenocytes in the presence of low dose IL-2 for 3 wk, and TCR V beta usage was determined by quantitative reverse transcriptase-PCR. Patients were grouped into three categories based on TCR V beta profiles and the clinical status of the allograft. 1) In one patient, BAL-derived T cells expressed heterogeneous V beta repertoires at all time points evaluated. This patient did not experience graft rejection during the 16-mo period of observation, though respiratory infections were diagnosed. 2) In three patients, V beta usage by BAL-derived T cells was restricted during allograft rejection episodes, but was heterogeneous in the absence of rejection and during respiratory infections. In one of these patients, similar V beta repertoires were employed by BAL cells during multiple rejection episodes. 3) In two patients, restricted V beta usage by BAL-derived T cells was observed before and during rejection episodes. Collectively, these data illustrate that human lung allograft rejection, but not pulmonary infection, is associated with T cells expressing a limited number of V beta families. Restricted V beta usage by graft-reactive T cells may allow for the selective elimination of these cells using TCR-specific reagents, thereby promoting allograft-specific tolerance.


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