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Identification of a Unique Tumor-specific Antigen As a Novel Class I Major Histocompatibility Molecule

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Specialty Science
Date 1985 Aug 1
PMID 3860848
Citations 20
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Abstract

Cancers induced by physical or chemical carcinogens express tumor-specific antigens that are uniquely specific for any given tumor; therefore, there is a seemingly endless variety of these unique antigens. We have studied a UV-induced fibrosarcoma, designated 1591, to elucidate the obscure molecular nature and genetic origins of unique tumor-specific antigens. A monoclonal antibody raised against syngeneic 1591 tumor cells has unique tumor specificity. This tumor-specific monoclonal antibody precipitated from the tumor a 45-kDa molecule associated with a 12-kDa molecule having the pI of beta2-microglobulin. This and other evidence indicated that the 1591 tumor expresses a novel class I molecule. A 1591 variant selected for the absence of binding to the monoclonal antibody lacked the novel class I MHC molecule as well as reactivity with cytotoxic T lymphocytes specific for the 1591 tumor. Furthermore, tumor cells bearing the antigen are rejected while variants that have lost the antigen grow progressively. Fourteen of 14 host-selected progressor tumor variants lost reactivity with the monoclonal antibody and provided further evidence that this novel class I molecule is a transplantation antigen on the parental 1591 tumor required for immune rejection. The identification of a unique tumor-specific antigen as a novel class I major histocompatibility complex gene product allows us to search for the possible genetic mechanisms involved and to explore further the role such molecules play in tumor immunity and malignancy.

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