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BAFF is a survival and maturation factor for mouse B cells
Antonius G Rolink1, Jürg Tschopp, Pascal Schneider
1Department of Immunology, University of Basel, Basel, Switzerland. Antonius.Rolink@unibas.ch
European Journal of Immunology
|July 13, 2002
Summary
Human B cell-activating factor (BAFF) promotes the survival and maturation of mouse B cells in culture. It induces phenotypic changes and alters reactivity, but does not prevent negative selection during B cell development.
Area of Science:
- Immunology
- Cell Biology
Background:
- B cell development is a complex process involving survival and maturation signals.
- B cell-activating factor (BAFF) is a key cytokine in regulating B cell homeostasis.
Purpose of the Study:
- To investigate the effects of human BAFF on mouse B cell subpopulations in vitro.
- To determine BAFF's role in B cell survival, maturation, and reactivity.
Main Methods:
- Culture of mouse bone marrow and spleen B cells.
- Treatment with human BAFF.
- Analysis of cell surface markers (IgM, IgD, CD21, CD23, C1qRp/AA4.1).
- Assessment of apoptosis and proliferation in response to BAFF and anti-Ig antibodies.
Main Results:
- BAFF increased the longevity of immature and mature mouse B cells in culture.
- BAFF induced phenotypic maturation, including loss of C1qRp and upregulation of IgD, CD21, and CD23 on immature B cells.
- BAFF-treated immature B cells (types 1 and 2) proliferated upon stimulation with anti-Ig antibodies, unlike untreated cells.
- BAFF did not prevent negative selection of developing immature B cells in vitro.
Conclusions:
- BAFF promotes survival and functional maturation of mouse B cells.
- BAFF alters B cell responses to stimuli, enhancing proliferation potential.
- BAFF's effects are primarily on mature and immature B cell subsets, without overriding critical developmental checkpoints like negative selection.