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- W1966880010 abstract "BALB/c mice were rendered immune to syngeneic SV40-induced sarcoma by subcutaneous injection of mKSA-TU5 tissue-culture adapted cells. Spleen cells from immune mice were examined for tumor-cell neutralization in the Winn assay as well as in in vitro lymphocyte stimulation assays. A microculture (200 mul) lymphocyte stimulation (LS) assay utilizing immune spleen cells was employed with mixed lymphocyte/tumor-cell cultures (MLTC) and the papain crude soluble (CS) extracts from mKSA-TU5 cells. Specificity in the LS assay was determined using spleen cells from mice immune to other syngeneic tumors and by soluble antigenic preparation of normal BALB/c spleen cells. The Winn assay studies demonstrated that spleen cells from mKSA-sensitized mice neutralized mKSA tumor cells and this was corroborated by their resistance to direct tumor challenge. Positive lymphocyte transformation responses in MLTC were observed when mKSA-TU5-sensitized spleen cells were mixed with mitocycin-C-treated intact tumor cells or when papain-solubilized antigens of mKSA cells were employed, but not with non-immune spleen cells or with a soluble antigen from normal cells. Papain-solubilized antigen preparations employed in in vitro assays also immunized against challenge with mKSA tumor cells. Specificity of these lymphocyte transformation reactions was demonstrated with non-sensitized lymphoid cells or lymphoid cells from mice sensitized with a syngeneic Kirsten virus-induced respond. Thus, mKSA tumor surface antigens were recognized on intact tumor cells or with microgram quantities of papain-solubilized extracts from these tumor cells. We believe the lymphocyte stimulation assay affords a method for demonstrating the presence of tumor-specific antigen and for monitoring further purification procedures." @default.
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- W1966880010 date "1975-09-15" @default.
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- W1966880010 title "Studies of lymphocyte stimulation by intact tumor-cell and solubilized tumor antigen" @default.
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- W1966880010 doi "https://doi.org/10.1002/ijc.2910160314" @default.
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