title: Restricted V beta usage by T cells infiltrating rejecting human lung allografts.
abstract: 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.
authors.affiliation: Transport Immunology Research Laboratory, Department of Surgery, University of Michigan School of Medicine, Ann Arbor 48109, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: DeBruyne
authors.forename: J P
authors.initials: JP
authors.lastname: Lynch
authors.forename: L A
authors.initials: LA
authors.lastname: Baker
authors.forename: R
authors.initials: R
authors.lastname: Florn
authors.forename: G M
authors.initials: GM
authors.lastname: Deeb
authors.forename: R I
authors.initials: RI
authors.lastname: Whyte
authors.forename: D K
authors.initials: DK
authors.lastname: Bishop
mesh_terms: D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry / Q000276:immunology; D015704:CD4 Antigens / Q000378:metabolism; D016827:CD8 Antigens / Q000378:metabolism; D002465:Cell Movement / Q000235:genetics / Q000276:immunology*; D006084:Graft Rejection / Q000235:genetics / Q000276:immunology*; D006085:Graft Survival / Q000235:genetics / Q000276:immunology; D006801:Humans; D016040:Lung Transplantation / Q000276:immunology*; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics* / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000737:chemistry / Q000276:immunology*; D014184:Transplantation, Homologous
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D016693:Receptors, Antigen, T-Cell, alpha-beta