"Hidden" cytotoxic antibodies that react with allogeneic cultured fetal and tumor cells contained in soluble immune complexes from normal human sera.

Abstract

Hidden complement-dependent cytotoxins were demonstrated in normal donor sera after removing anti-immunoglobulins that normally block the ability of these immunoglobulin Gs to react with surface antigens on tumor cells. The blocking antibodies had certain properties of anti-idiotypes. Immunoglobulin G from Cohn Fraction II, after removing these anti-immunoglobulins, was cytotoxic for cultured fetal cells and for malignant melanoma, breast, lung, colon, and other tumor cells maintained either in tissue culture or by serial passage in nude mice. The cytotoxins were not adsorbed by extracts from normal lymphoid, liver, skin, or red blood cells. These results suggest that a heterogeneous group of natural antibodies reactive with antigens expressed on a variety of neoplastic and fetal cells circulate in normal donor sera as part of a soluble immune complex, together with a blocking anti-immunoglobulin.

• Authors: A C Morgan, R D Rossen, K J McCormick, J S Stehlin Jr, B C Giovanella
• Journal: Cancer research (Cancer Res) Vol. 42 Issue 3 Pg. 881-7 (Mar 1982) ISSN: 0008-5472 [Print] United States
• PMID: 7059986 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Antibodies, Neoplasm
• Cytotoxins
• Immunoglobulin G

Topics

• Animals
• Antibodies, Neoplasm (immunology)
• Breast Neoplasms (immunology)
• Cattle
• Cell Line
• Cross Reactions
• Cytotoxicity Tests, Immunologic
• Cytotoxins (immunology)
• Fetus (immunology)
• Humans
• Immunoglobulin G (immunology)
• Lung Neoplasms (immunology)
• Melanoma (immunology)