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. 1982 Nov;14(1):46–53. doi: 10.1007/BF00199432

Mechanisms of BCG action

I. The induction of nonspecific helper cells during the potentiation of alloimmune cell-mediated cytotoxic responses

Martin Davies 1, Edris Sabbadini 1
PMCID: PMC11039046  PMID: 6218872

Abstract

Donor mice were treated IV with BCG and after various time intervals the spleens from these animals were injected into syngeneic recipients which were simultaneously challenged with an allogeneic tumour. The spleen cells from the BCG-treated donors, but not untreated donors, conferred on the recipients an ability to induce a potentiated CMC reaction against the tumour. The transference of BCG-induced potentiating activity could not be explained by the transference of viable BCG organisms, but was mediated by a cell that was anti-Thy.1-sensitive, silica-resistant, plastic-nonadherent, and nylon wool-adherent, and was sensitive in vivo to anti-thymocyte serum but resistant to hydrocortisone. By the use of congenic strains of mice that differed at the Thy.1 allele, it was shown that the cells responsible were not precursors of the cytotoxic lymphocytes but were cells that produced an amplification of the response of the recipient host's precursor cytotoxic T cells.

Keywords: Hydrocortisone, Cancer Research, Nylon, Spleen Cell, Congenic Strain

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