Related Experiment Videos
Expression and function of Fas antigen on activated murine B cells
J Wang1, I Taniuchi, Y Maekawa
1Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
European Journal of Immunology
|January 1, 1996
Summary
T cell-derived CD40 ligand (CD40L) strongly up-regulates Fas antigen expression on B lymphocytes, influencing their sensitivity to Fas-mediated apoptosis based on activation duration and co-stimulation. This reveals dual regulation of B cell responses.
Area of Science:
- Immunology
- Cell Biology
Background:
- Fas antigen plays a critical role in regulating lymphocyte homeostasis and apoptosis.
- B cell activation and survival are tightly controlled processes involving various signaling pathways.
Purpose of the Study:
- To investigate the expression and function of Fas antigen on murine B lymphocytes.
- To determine the factors influencing Fas-mediated apoptosis in activated B cells.
Main Methods:
- Murine B lymphocytes were stimulated with soluble CD40 ligand (CD40L), anti-IgM, and interleukin-4 (IL-4).
- Fas expression levels were assessed using flow cytometry.
- Sensitivity to Fas-mediated apoptosis was evaluated following different durations and conditions of B cell activation.
Main Results:
- Soluble CD40L potently up-regulated Fas expression on B lymphocytes, an effect enhanced by anti-IgM and IL-4.
- B cell sensitivity to Fas-mediated apoptosis was dependent on the duration of activation, with 3-day activated cells being more sensitive than 1-day activated cells.
- B cells stimulated with CD40L alone exhibited greater sensitivity to Fas-mediated apoptosis compared to those receiving additional co-stimulation.
Conclusions:
- T cell-derived CD40 signaling is a key regulator of Fas expression in B lymphocytes.
- B cell activation status and co-stimulatory signals modulate sensitivity to Fas-mediated cell death.
- Signaling through CD40 and Fas antigens provides both positive and negative regulatory control over B cell responses.