Characterization of a monoclonal antibody that defines an immunoregulatory T cell subset for immunoglobulin synthesis in humans.

Journal Article (Journal Article)

This study characterizes a monoclonal antibody (3A1), and partially characterizes the cell surface antigen and the functional peripheral blood T cell subset that it defines. The 3A1 antigen is present on the surface of several human T cell lines (HSB-2, CEM, MOLT-4, and others) in various amounts but is absent from the T cell line YT4E and all human B cell lines tested. Immunoprecipitation of an HSB-2 extract with 3A1 yielded one specific band with a molecular weight of approximately 40,000 in the presence of reducing agent. With directly fluoresceinated 3A1 antibody, fluorescence-activated cell sorter analysis showed that 85% of peripheral blood E-rosette-positive T cells were positive for the 3A1 antigen. After E-rosette-positive cells had been separated into 3A1+ and 3A1- cell suspensions, the 3A1+ cells helped autologous peripheral blood B cell suspensions toward pokeweed mitogen-driven proliferation and intracytoplasmic Ig production, whereas 3A1-T cells did not. Further, addition of 3A1- cells from some but not all normal subjects to cocultures of 3A1+ cells and B cells actively suppressed intracytoplasmic Ig production. However, the 3A1+T cell subset could be activated by concanavalin A to maximally suppress B cell Ig synthesis in vitro. Thus, the 3A1 antibody defines a major functional subject of peripheral blood T cells and should provide a useful marker for the study of human T cell function.

Full Text

Duke Authors

Cited Authors

  • Haynes, BF; Mann, DL; Hemler, ME; Schroer, JA; Shelhamer, JH; Eisenbarth, GS; Strominger, JL; Thomas, CA; Mostowski, HS; Fauci, AS

Published Date

  • May 1980

Published In

Volume / Issue

  • 77 / 5

Start / End Page

  • 2914 - 2918

PubMed ID

  • 6156457

Pubmed Central ID

  • PMC349516

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.77.5.2914


  • eng

Conference Location

  • United States