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Human T cell responses to beta-galactosidase
J D Oxley1, R H Brookes, L S Rayfield
1Department of Immunology, United Medical School, Guy's Hospital, London, England.
Clinical and Experimental Immunology
|March 1, 1991
Summary
Peripheral blood T cells naturally respond to beta-galactosidase (beta-Gal). Leucine methyl ester (LeuOMe) treatment enhanced B cell presentation of beta-Gal, suggesting its utility in human immunoregulation studies.
Area of Science:
- Immunology
- Cell Biology
Background:
- T cells in peripheral blood often exhibit natural responses to beta-galactosidase (beta-Gal).
- This natural priming suggests beta-Gal as a relevant antigen for immunological studies.
Purpose of the Study:
- To isolate and characterize T cell clones specific for beta-Gal.
- To investigate the effect of leucine methyl ester (LeuOMe) treatment on antigen-presenting cells for beta-Gal.
Main Methods:
- Isolation of T cell clones from peripheral blood mononuclear cells (PBMC), with and without LeuOMe pretreatment.
- Characterization of T cell clones (CD4+, CD8-, alpha beta TcR+, cytotoxic potential).
- Generation of Epstein-Barr virus (EBV) transformed B cell lines for antigen presentation assays.
Main Results:
- Four T cell clones specific for beta-Gal were successfully isolated.
- LeuOMe-treated B cells demonstrated enhanced presentation of beta-Gal at lower antigen concentrations compared to untreated cells.
- All isolated T cell clones expressed CD4, CD8-, and alpha beta TcR markers.
Conclusions:
- Beta-galactosidase serves as a valuable model antigen for studying human immunoregulation.
- LeuOMe pretreatment can enhance the efficiency of antigen presentation by B cells.
- The findings support the role of natural T cell priming in immune responses.