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Developmental sequence of T200 antigen modifications in murine T cells
1Department of Cell Biology, Upjohn Company, Kalamazoo, MI 49001.
Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1987
Summary
T cell development involves molecular switches in T200 glycoprotein expression. These T200 proteins undergo lineage-specific modifications in peripheral T cells and further alterations during in vitro activation.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- T200 glycoproteins are crucial cell surface molecules involved in T cell differentiation.
- Understanding T200 expression patterns provides insights into T cell development and function.
Purpose of the Study:
- To analyze T200 glycoprotein expression during T cell development in the thymus and peripheral lymphoid organs.
- To investigate developmental and lineage-specific modifications of T200 proteins.
Main Methods:
- Immunoprecipitation and SDS-PAGE to analyze T200 protein expression.
- Use of monoclonal antibodies (14.8 and RA3) to detect antigenic differences.
- Analysis of T200 proteins in thymocytes, peripheral T cell subsets, and T cell clones.
Main Results:
- Distinct T200 protein profiles were observed in different thymocyte subsets (Lyt-2-L3T4-, Lyt-2+L3T4+, Lyt-2+L3T4-, Lyt-2-L3T4+).
- Peripheral L3T4+ and Lyt-2+ T cells exhibited unique T200 protein profiles and antigenic modifications.
- Lyt-2+ T cells showed lineage-specific T200 modifications, including a higher molecular weight form, after thymic exit.
- In vitro activation led to further T200 antigen alterations, with cytotoxic T cell clones displaying a T200 form similar to B cells.
Conclusions:
- T200 glycoprotein expression is developmentally regulated during T cell differentiation.
- Lineage-specific modifications of T200 proteins occur in peripheral T cell subsets.
- These findings highlight the dynamic nature of T200 expression in response to T cell maturation and activation.