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Biochemical studies on a cell surface determinant involved in T-cell proliferation
Cellular Immunology
|August 1, 1987
Summary
A monoclonal antibody, TH5.2, identifies a T-cell surface glycoprotein (55-60 kDa) crucial for T-cell proliferation. This antigen is distinct from known T-cell receptors and markers like T3, T4, T8, and Leu-5.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Monoclonal antibody TH5.2 targets a determinant involved in T-cell proliferation.
- Characterizing cell-surface antigens is crucial for understanding T-cell function.
Purpose of the Study:
- To identify and characterize the T-cell surface antigen recognized by the TH5.2 antibody.
- To determine if the TH5.2 antigen is distinct from other known T-cell surface molecules.
Main Methods:
- Biochemical analysis of the TH5.2 antigen, including molecular weight determination.
- Sequential immunoprecipitation to compare TH5.2 with other T-cell receptors.
- Antigenic modulation experiments to assess co-expression with other T-cell markers.
Main Results:
- The TH5.2 antigen is a glycoprotein with a molecular weight of 55,000-60,000.
- It contains minimal tunicamycin-sensitive carbohydrate structures.
- The TH5.2 antigen is molecularly distinct from the interleukin-2 receptor (Tac) and T4 molecule.
- It does not comodulate with T3, T4, T8, or Leu-5 antigens, confirming its unique identity.
Conclusions:
- The TH5.2 antibody recognizes a novel T-cell surface glycoprotein.
- This glycoprotein plays a role in T-cell proliferation and is distinct from established T-cell markers.