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• W1622563312 abstract "Abstract The question as to whether or not cancer patients have tumor antigen-induced suppressor T cells is of considerable interest and importance. As an approach to that question, the effect of addition of autologous irradiated tumor-derived cells (TDC) on the mixed lymphocyte response (MLR) of patients' lymphocytes (Ly) and of healthy donor Ly was tested. The rationale for these experiments was based on the fact that circulating antigen-responsive blood lymphocytes can be reactivated in vitro by exposure to the appropriate antigen. Thus, if there are circulating tumor antigen-reactive suppressor Ly, exposure to TDC as a source of the antigen should reactivate those cells. Reactivation of suppressor cells might result in diminished responsiveness to other stimuli such as alloantigens in the mixed leukocyte culture. We found that the addition of TDC to Ly cultures produced four distinct patterns of reaction. In 26 of the 74 different patient-tumor assays, the addition of autologous TDC to the patient cultures inhibited MLR, but the addition of the same TDC to cultures of Ly from healthy donors had no effect or increased their responsiveness (Specific Suppression). In 21 cases, the addition of autologous TDC to the patient cultures suppressed the MLR and the addition of the same TDC to control cultures suppressed the response of some but not all the healthy donors (Selective Suppression). In four cases, the addition of TDC to the cultures suppressed the MLR of the patients and all of the control donors (Nonspecific Suppression). In 23 cases, the addition of autologous TDC resulted in no suppression of the patient MLR or of any of the simultaneously tested normal donors (No Suppression). When TDC of patients with noninvasive bladder cancer were added to their own Ly cultures, only four of 11 produced specific or selective suppression compared to 11 of 12 when TDC came from patients with superficially invasive cancer. These data provide indirect evidence to support the hypothesis that human tumors induce circulating suppressor cells that may be reactivated in vitro by co-culture with TDC." @default.
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• W1622563312 date "1983-12-01" @default.
• W1622563312 modified "2023-09-25" @default.
• W1622563312 title "Suppression of the responsiveness of lymphocytes from cancer patients triggered by co-culture with autologous tumor-derived cells." @default.
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• W1622563312 doi "https://doi.org/10.4049/jimmunol.131.6.3085" @default.
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