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A positive signal is transduced via surface CD4 molecules
1Ludwig Institute for Cancer Research, Lausanne Branch, 1066 Epalinges, Switzerland.
Research in Immunology
|June 1, 1989
Summary
A novel monoclonal antibody (mAb) B66 activates T cells by targeting the CD4 antigen. This antibody induces interleukin-2 production and affects CD4 and CD3 molecular complex expression on T cells.
Area of Science:
- Immunology
- Molecular Biology
- Cellular Biology
Background:
- The CD4 antigen is a critical co-receptor in T-cell activation.
- Previous research identified a monoclonal antibody (mAb) capable of activating CD4+ T cells independently.
Purpose of the Study:
- To investigate the T-cell activating capabilities of the novel anti-CD4 mAb, B66.
- To explore the effects of mAb B66 on interleukin-2 production and cell surface molecule expression.
Main Methods:
- Utilized murine T-cell hybridoma transfectants expressing human CD4.
- Incubated Jurkat cells and transfectants with mAb B66 and a non-stimulatory anti-CD4 mAb.
- Analyzed cell surface expression of CD4 and CD3 molecules.
Main Results:
- mAb B66 induced interleukin-2 production in CD4-expressing transfectants.
- Incubation with mAb B66 led to significant downregulation of both CD4 and CD3 on Jurkat cells.
- Modulation of CD4, but not CD3, was observed with a non-stimulatory anti-CD4 antibody.
Conclusions:
- The stimulatory activity of anti-CD4 mAb B66 may involve the CD3 molecular complex.
- Cross-linking of CD4 alone can trigger T-cell activation.
- The CD4 glycoprotein can transduce independent positive signals upon binding to MHC class II molecules.
