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Identification of several cell surface proteins of non-T, non-B acute lymphoblastic leukemia by using monoclonal antibodies.

E J Quackenbush and M Letarte
J Immunol February 1, 1985, 134 (2) 1276-1285;
E J Quackenbush
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M Letarte
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Abstract

Monoclonal antibodies (MAb) were produced by immunization of BALB/c mice with cells from a non-T, non-B acute lymphoblastic leukemia (ALL) cell line. Nine distinct antigens (groups I to IX) were defined by these monoclonal antibodies, some of which appear to be associated with specific stages of cellular differentiation. The number of molecules of each MAb reactive with the ALL cell line, measured in a quantitative cellular radioimmunoassay, varied from 0.6 X 10(5) to 11 X 10(5) molecules/cell, indicating that the antigens identified represent major constituents of the cell surface. The biochemical nature of the antigens was examined on the ALL cell line by antibody affinity chromatography and/or immunoprecipitation and SDS-polyacrylamide gel electrophoresis. Groups I through III are composed of previously described antigens: HLA class I, HLA class II molecules, and CALLA, the common ALL antigen. The other MAb define antigens previously undescribed on non-T, non-B ALL cells. Group IV antigen is a polypeptide of apparent m.w. 95,000 distinct from CALLA. It is expressed on some ALL samples and on the vascular endothelial cells of several tissues. Group V antigen is a single polypeptide chain of m.w. 94,000, also distinct from CALLA and expressed by lymphocytes, thymocytes, acute myelogenous leukemia (AML) cells, and ALL cells. Group VI is a molecular complex composed of two noncovalently associated polypeptides of apparent m.w. 125,000 and 87,000 and appears to be restricted to ALL, AML, macrophages, and hematopoietic precursor cells. Group VII is a glycoprotein of apparent m.w. 85,000, which, within the thymus, is primarily restricted to the medullary area. It is also present on AML, bone marrow cells, and mature T and B lymphocytes. Group VIII is a disulfide-linked complex of apparent m.w. greater than 120,000 under nonreducing conditions. It is resolved into three major polypeptides of apparent m.w. 57,000, 47,000, and 41,000 under reducing conditions. This complex is found in greatest amounts on the non-T, non-B ALL cell line but is also present on AML, ALL, and on subpopulations of normal bone marrow and tonsil cells. Group IX antigen is a single polypeptide chain of apparent m.w. 51,000 on the ALL cell line. This antigen is expressed strongly on ALL and AML samples and on normal bone marrow; much lower antigenic density is found on thymus and tonsil cells. The antigens described here with a series of MAb produced in a single fusion represent a unique array of cell surface molecules of non-T, non-B ALL cells.(ABSTRACT TRUNCATED AT 400 WORDS)

  • Copyright © 1985 by American Association of Immunologists
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The Journal of Immunology
Vol. 134, Issue 2
1 Feb 1985
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Identification of several cell surface proteins of non-T, non-B acute lymphoblastic leukemia by using monoclonal antibodies.
E J Quackenbush, M Letarte
The Journal of Immunology February 1, 1985, 134 (2) 1276-1285;

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Identification of several cell surface proteins of non-T, non-B acute lymphoblastic leukemia by using monoclonal antibodies.
E J Quackenbush, M Letarte
The Journal of Immunology February 1, 1985, 134 (2) 1276-1285;
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Print ISSN 0022-1767        Online ISSN 1550-6606