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The adjuvant effect of Corynebacterium parvum: T-cell dependence of macrophage activation
Abstract:
Splenic and peritoneal macrophages from mice treated with Corynebacterium parvum enhanced the antibody response in vitro of normal nonadherent spleen cells to SRBC, but not to DNP-POL. This enhancement was dependent on the dose and time of administration of C. parvum and could be abrogated by pretreatment with carrageenan. Macrophages from T-cell-depleted mice failed to enhance the response, but this ability was restored if the mice had been reconstituted with purified T lymphocytes. Macrophages that are activated by C. parvum are a resident nondividing population. It is postulated that activated macrophages, capable of enhancing antibody responses to T-cell-dependent antigens, arise through a cell-mediated reaction to C. parvum.
Insights
Corynebacterium parvum (C. parvum) activates macrophages, enhancing antibody production in mice. This immune response requires T lymphocytes and is dependent on C. parvum dosage and timing.
Area of Science:
- Immunology
- Microbiology
Background:
- Corynebacterium parvum (C. parvum) is known to modulate immune responses.
- Macrophages play a crucial role in orchestrating adaptive immunity.
Purpose of the Study:
- To investigate the effect of C. parvum-activated macrophages on antibody production.
- To elucidate the cellular mechanisms underlying C. parvum-induced immune enhancement.
Main Methods:
- Mice were treated with C. parvum, and splenic and peritoneal macrophages were isolated.
- In vitro antibody responses of normal spleen cells to sheep red blood cells (SRBC) and DNP-POL were assessed.
- T-cell depletion and reconstitution experiments were performed.
- Carrageenan pretreatment was used to assess the role of macrophages.
Main Results:
- C. parvum-activated macrophages enhanced antibody response to SRBC but not DNP-POL.
- Enhancement was dose- and time-dependent and abrogated by carrageenan.
- T-cell depletion abolished enhancement, which was restored by T lymphocyte reconstitution.
- Activated macrophages were identified as a resident, nondividing population.
Conclusions:
- C. parvum-activated macrophages enhance T-cell-dependent antibody responses.
- T lymphocytes are essential for this macrophage-mediated enhancement.
- A cell-mediated reaction to C. parvum likely generates these activated macrophages.