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Abnormal polyclonal B cell activation in NZB/NZW F1 mice
Journal of Immunology (Baltimore, Md. : 1950)
|October 1, 1977
Summary
Old autoimmune mice show impaired antibody production due to B cell activation issues. This age-related defect in spleen cells affects antibody-forming cell generation, impacting immune responses.
Area of Science:
- Immunology
- Autoimmunity
- Cellular immunology
Background:
- NZB/NZW (B/W) mice are a model for autoimmune diseases.
- Age-related immune dysregulation is common in autoimmune conditions.
- B cell activation is crucial for antibody production.
Purpose of the Study:
- To investigate the impaired antibody production in aged autoimmune mice.
- To determine the cause of the B cell defect in response to polyclonal activators.
- To explore the role of B cell activation in autoantibody formation.
Main Methods:
- Spleen cells from young and old NZB/NZW mice were isolated.
- Cells were stimulated with polyclonal B cell activators (LPS, PPD) and TNP-Ficoll.
- Antibody-forming cell (AFC) generation and DNA synthesis were measured.
- T suppressor cell activity was assessed using anti-brain-associated-theta treatment.
Main Results:
- Old B/W mice spleen cells showed reduced AFC generation to LPS and PPD, but normal response to TNP-Ficoll.
- DNA synthesis responses to LPS and PPD were normal in old B/W mice.
- The defect was age-dependent, as young B/W mice showed vigorous AFC responses.
- Suppressor T cells were not responsible for the observed B cell defect.
Conclusions:
- Aged B/W mice exhibit an intrinsic defect in B cell activation.
- This defect is linked to in vitro polyclonal B cell activation during autoantibody formation.
- The findings suggest a specific impairment in B cell response rather than general immune suppression.