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Previous Volume 292:1257-1263 June 12, 1975 Number 24 Next

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Abstract

To determine the identity and cytotoxic capacity of lymphoid cells involved in allograft rejection, we studied viable, monodispersed cells recovered from 10 rejected human renal allografts. A heterogeneous population of cells including macrophages and both bone-marrow (B) and thymus-derived (T) lymphocytes accumulate in rejected grafts. Infiltrating lymphocytes exerted a specific cytolytic effect on 51Cr-labeled peripheral blood lymphocytes bearing donor antigens, ranging from 7 to 44 per cent specific lysis in nine of 10 cases. Cytolysis was closely correlated (r equal 0.91, p less than 0.05) with the histologica grade of cellular rejection but not with humoral rejection, suggesting that cytotoxic lymphocytes are an important element in cellular rejection. Limited fractionation studies showed that both T cells (in early rejection) and non-T cells (in late rejection) may produce cytotoxicity. Since as many as 50 per cent of cells recovered bore Fc receptors, the rejection process may also involve antibody-dependent target-cell lysis.

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