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. 1971 Oct 31;134(5):1238–1252. doi: 10.1084/jem.134.5.1238

LYMPHOCYTE-MEDIATED CYTOTOXICITY IN VITRO

EFFECT OF ENHANCING ANTISERA

William J Klein Jr 1
PMCID: PMC2139019  PMID: 5112204

Abstract

The ability of antisera to suppress immune responses either in vivo or in vitro is well known. A variety of lymphocyte-target cell systems have been employed to demonstrate inhibition of cell-mediated immunity by antisera in vitro, and skin, tumor, and kidney graft survival have been prolonged by passively administered antiserum in vivo. An in vitro lymphocyte-tumor cell assay system was developed for the purpose of studying the effects of enhancing antisera (in vivo) on lymphocyte-mediated cytotoxicity in vitro. The characteristics of this system with respect to route of immunization, time of harvest of immune cells, lymphocyte:tumor cell ratio, and effect of nonimmune or nonspecifically immune lymphoid cells are presented. Sera capable of enhancement in vivo were tested in this system and shown to inhibit cell-mediated immunity in vitro. Further, in both instances the immunosuppressive effect is mediated by antigen-antibody complexes and not by free antibody alone. Experiments were also carried out to determine the site of action of these suppressive antigen-antibody complexes. Presensitized lymphocytes were exposed to antigen-antibody complexes, washed, and then allowed to interact with fresh tumor cells (not antibody treated). Lymphocytes treated in this manner are incapable of exhibiting cell-mediated immunity in vitro. This evidence supports the concept that the antigen-antibody complexes have a direct immunosuppressive effect on the lymphocyte.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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