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Characterization of a monoclonal antibody that defines an immunoregulatory T cell subset for immunoglobulin synthesis in humans.
- Source :
-
Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 1980 May; Vol. 77 (5), pp. 2914-8. - Publication Year :
- 1980
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 0027-8424
- Volume :
- 77
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Type :
- Academic Journal
- Accession number :
- 6156457
- Full Text :
- https://doi.org/10.1073/pnas.77.5.2914