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An analysis of the defective response of CBA/N mice to T-dependent antigens
Abstract:
CBA/N mice fail to respond to T-independent antigens, and give a diminished response to T-dependent antigens. The cellular basis of the diminished response to T-dependent antigens in this strain was analyzed by means of adoptive transfers of various primed cell populations along with cells from the immunologically normal, histocompatible strain CBA/CaJ. CBA/N mice behaved normally as recipients and had normal levels of spleen helper cell activity. However, CBA/N spleen cells, used as a B cell source, produced only 56% as much antibody as CBA/CaJ cells. Since CBA/N mice have a relative frequency of immunoglobulin-bearing lymphocytes roughly half that of normal mice, these results suggest that CBA/N mice have a quantitative defect in spleen B cells responsive to T-dependent antigens.
Insights
CBA/N mice exhibit a reduced immune response to T-dependent antigens due to a quantitative defect in spleen B cells. This impacts antibody production, highlighting a specific B cell deficiency in this mouse model.
Area of Science:
- Immunology
- Immunogenetics
Background:
- CBA/N mice demonstrate impaired responses to T-independent antigens and reduced responses to T-dependent antigens.
- Understanding the cellular basis of this diminished T-dependent antigen response is crucial for B cell immunology.
Purpose of the Study:
- To analyze the cellular mechanisms underlying the reduced T-dependent antigen response in CBA/N mice.
- To investigate the role of B cells and helper cell activity in CBA/N mice's immune deficiency.
Main Methods:
- Adoptive transfer experiments using primed cell populations from CBA/N and normal CBA/CaJ mice.
- Assessment of spleen helper cell activity and antibody production using B cells from both mouse strains.
Main Results:
- CBA/N mice function as normal recipients and possess normal spleen helper cell activity.
- B cells from CBA/N mice produced significantly less antibody (56%) compared to CBA/CaJ B cells when responding to T-dependent antigens.
- CBA/N mice have approximately half the frequency of immunoglobulin-bearing lymphocytes compared to normal mice.
Conclusions:
- The findings suggest a quantitative defect in CBA/N spleen B cells specific for T-dependent antigen responses.
- This defect contributes to the overall diminished immune reactivity observed in CBA/N mice.
- The results underscore the importance of B cell numbers in effective T-dependent immune responses.