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High molecular weight antigens present on human T cells
Summary
Researchers identified unique high molecular weight glycoproteins on human T cells. These T cell surface antigens, potentially products of a multigenic system, change upon stimulation and may be equivalent to murine Ly 5 antigens.
Area of Science:
- Immunology
- Cell Biology
- Glycoprotein Research
Background:
- Human peripheral T cells express a complex array of high molecular weight glycoproteins.
- Previous studies have not fully characterized the diversity and relationships of these T cell surface antigens.
Purpose of the Study:
- To characterize the high molecular weight glycoproteins on human peripheral T cells.
- To investigate the antigenicity and potential relationships among these glycoproteins.
- To explore their potential equivalence to murine Ly 5 antigens.
Main Methods:
- Radioimmunoprecipitation using rabbit antiserum to identify glycoproteins.
- Analysis of T cell lines and peripheral T cells.
- Adsorption/elution experiments to assess antigenic relationships.
- Lectins (ricin and lentil) used to differentiate protein groups.
Main Results:
- Eight distinct high molecular weight (140,000-220,000) glycoproteins were identified on human peripheral T cells.
- Each T cell line exhibited a unique antigen pattern, differing from peripheral T cells.
- Stimulation altered the antigen profile on peripheral T cells.
- Antigenic relationships revealed at least three protein groups, partially distinguished by lectin binding and antiserum reactivity.
- Lentil lectin-bound proteins appeared to be precursors to ricin-bound glycoproteins.
Conclusions:
- The identified glycoproteins likely represent products of a multigenic or multiallelic system.
- These human T cell glycoproteins show similarities to murine Ly 5 antigens.
- The findings provide insights into T cell surface antigen complexity and regulation.