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Regulation of cell-mediated immunologic reactivity to Moloney Murine sarcoma virus-induced tumors. III. Further characterization of tumor-specific serum blocking factors.

Blocking factors in the sera of inbred CBA mice bearing either Moloney murine sarcoma virus-induced tumors or transplanted 3-methylcholanthrene-induced tumors specifically blocked in the leukocyte adherence inhibition reaction between tumor-sensitized peritoneal cells and tumor antigens. These factors were absorbed from serum by treatment with anti-Ia antibodies and could be eluted in a partially purified form. Chromatography on Sephacryl S-200 columns demonstrated blocking activity in fractions of high and low molecular weight (greater than 100,000 and 40,000--50,000, respectively) derived from whole sera or eluates. Active fractions from serum appeared to retain the tumor specificity of the original material.