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    The monoclonal antibody CZ-1 identifies a mouse CD45-associated epitope expressed on interleukin-2-responsive cells

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    Authors
    Brutkiewicz, Randy R.
    O'Donnell, Carey L.
    Maciaszek, Joseph Walter
    Welsh, Raymond M.
    Vargas-Cortes, Mauricio
    UMass Chan Affiliations
    Department of Molecular Genetics and Microbiology
    Department of Pathology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    1993-10-01
    Keywords
    Animals; *Antibodies, Monoclonal; Antigens, CD45; Binding, Competitive; Cell Division; Epitopes; Interleukin-2; Killer Cells, Lymphokine-Activated; Leukocytes; Lymphocyte Activation; Mice; Mice, Inbred C57BL; N-Acetylneuraminic Acid; Protein Processing, Post-Translational; Sialic Acids; Transfection
    Immunopathology
    Life Sciences
    Medicine and Health Sciences
    
    Metadata
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    Link to Full Text
    https://doi.org/10.1002/eji.1830231008
    Abstract
    We have previously described a monoclonal antibody (mAb), CZ-1, which reacts with an epitope expressed on most peripheral basophils, natural killer cells, B cells, and CD8+ T cells, but not with most thymocytes or peripheral CD4+ T cells. Here we show that mAb CZ-1 defines a sialic acid-dependent epitope associated with a subpopulation of CD45 molecules. This conclusion is based on the ability to block binding of mAb CZ-1 by sialic acid, neuramin-lactose, neuraminidase, and mAb to CD45RB, and by expression of the epitope on transfected psi 2 cells expressing exon B of CD45. The results suggest that the CZ-1 epitope is a post-translational modification expressed on a subpopulation of the CD45 molecules also expressing the B exon. Expression of the CZ-1 epitope was required for freshly isolated lymphocytes to respond to interleukin-2 (IL-2). Depletion of CZ-1+ cells by C' or by cell sorting of thymocytes or splenocytes eliminated the IL-2 responsive cells. The subpopulations of thymocytes and CD4+ splenocytes responding to IL-2 were exclusively within the small CZ-1+ subpopulation. mAb CZ-1 was also used to subdivide CD45+ and CD45RB+ splenocytes into IL-2-responsive and -nonresponsive subpopulations. The CZ-1 epitope was also expressed on virtually all lymphokine-activated killer cell precursors. These data, thus, indicate that cells responsive to IL-2 express this sialated modification of CD45.
    Source

    Eur J Immunol. 1993 Oct;23(10):2427-33.

    DOI
    10.1002/eji.1830231008
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/32834
    PubMed ID
    7691607
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    Link to article in PubMed

    ae974a485f413a2113503eed53cd6c53
    10.1002/eji.1830231008
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