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Abstract:
BALB/c and C57BL/6 mice were infected with murine cytomegalovirus (MCMV). On day 4 or 12 of the infection, the animals were immunized with SRBC (T-dependent), TNP-Ficoll (T-independent) and standard poliovirus. The adverse effect of the virus infection on humoral immune responses was limited to animals immunized on day 4; while anti-SRBC antibody formation was severely depressed in both mouse strains, reduced plaque forming cells to TNP-Ficoll were registered only in BALB/c mice. Antibodies to poliovirus were depressed in both strains, although to a lesser degree in C57Bl/6 than in BALB/c mice. Anti-SRBC B cell memory was found to be affected by MCMV infection. These results are interpreted to mean that T-dependent and -independent antigens may be handled differently by the two mouse strains tested.
Insights
Murine cytomegalovirus (MCMV) infection impairs humoral immunity, particularly T-dependent responses, with varying effects on antibody production and B cell memory in BALB/c and C57BL/6 mice.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
Background:
- Murine cytomegalovirus (MCMV) is a significant pathogen impacting host immune responses.
- Understanding how viral infections affect adaptive immunity, specifically humoral responses, is crucial for managing disease.
- Different mouse strains exhibit distinct immune susceptibilities and responses to pathogens.
Purpose of the Study:
- To investigate the impact of MCMV infection on humoral immune responses in BALB/c and C57BL/6 mice.
- To compare the effects of MCMV on T-dependent and T-independent antibody production.
- To assess the influence of MCMV on B cell memory formation.
Main Methods:
- BALB/c and C57BL/6 mice were infected with MCMV.
- Animals were immunized with T-dependent (SRBC), T-independent (TNP-Ficoll), and poliovirus antigens at different time points post-infection (day 4 or 12).
- Humoral immune responses, including antibody production and plaque-forming cells, were measured.
Main Results:
- Adverse effects on humoral immunity were observed primarily in mice infected on day 4.
- Anti-SRBC antibody formation was significantly reduced in both mouse strains.
- Reduced plaque-forming cells for TNP-Ficoll were noted only in BALB/c mice, while poliovirus antibody levels were depressed in both strains, with BALB/c showing a greater reduction.
- MCMV infection affected anti-SRBC B cell memory.
Conclusions:
- MCMV infection differentially impacts T-dependent and T-independent humoral immune responses.
- Mouse strain background (BALB/c vs. C57BL/6) influences the susceptibility to MCMV-induced immunomodulation.
- The timing of antigen exposure relative to MCMV infection is critical in determining the severity of immune impairment.