title: Ly 1+2- suppressor T cells down-regulate the generation of Ly 1-2+ effector T cells during progressive growth of the P815 mastocytoma.
abstract: It has been shown that progressive growth of the P815 mastocytoma in its semisyngeneic B6D2 host results, between days 6 and 9 of tumour growth, in the generation of Ly 1-2+ T cells which are capable, on passive transfer, of causing the regression of an established tumour in gamma-irradiated recipients, and of T cells which are capable of lysing P815 tumour cells in vitro. After 9 days of tumour growth, these effector T cells are progressively lost; this is associated with the progressive acquisition of Ly 1+2- suppressor T cells which are capable of inhibiting the expression of passively transferred immunity against an established tumour in T-cell deficient recipients. The results are consistent with the hypothesis that this P815 mastocytoma grows progressively, in spite of its immunogenicity, because it evokes the generation of suppressor T cells before enough effector T cells are generated to reject it.
authors.forename: R J
authors.initials: RJ
authors.lastname: North
authors.forename: E S
authors.initials: ES
authors.lastname: Dye
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000276:immunology*; D002455:Cell Division; D007116:Immunization, Passive; D012515:Mast-Cell Sarcoma / Q000276:immunology* / Q000473:pathology; D051379:Mice; D012878:Skin Neoplasms / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000950:Antigens, Ly