J.Jpn. Surg. Soc.. 92(4): 367-373, 1991

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Original article

INDUCTION OF SUPPRESSOR T CELLS BY DONOR-SPECIFIC BLOOD LTRANSFUSION (DST): ESTABLISHMENT OF A HUMAN T CELL HYBRIDOMA PRODUCING AN MLR SUPPRESSING FACTOR

We established a human T cell hybridoma producing a mixed lymphocyte reaction (MLR) suppressing factor. Three weeks after DST, peripheral blood lymphocytes (PBL) were obtained from a recipient and were cultured for 3 days with mitomycin C (MMC)-treated donor PBL These lymphocytes were fused with an azaguanine-resistant mutant of a human T cell leukemic cell line (CCRF-CEM^AG). Four weeks after fusion, approximately 30% of the wells showed hybridoma cell growth. To select hybridoma clones with suppressive activity, irradiated hybridoma clohes were added as regulator cells to the mixed lymphocyte culture. After the cloning, one clone causing suppression of the donor-specific MLR was established(termed HK40: %MLR suppression=38.9%). Unstimulated supernatant of HK40 showed no suppressive effect on the specific MLR. In contrast, supernatant of HK40 cultured with donor PBL for 24 hrs, suppressed the donor-specific MLR dose- dependently. This primed supernatant of HK40 markedly suppressed the specific MLR when added at the culture initiation.
These findings indicate that functional clones causing suppression of the alloantigen-specific MLR can be generated in patients receiving DST, and suggest that these clones may be essential to the prolongation of kidney allograft survival.

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