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Enhancement of antigen-specific immunoglobulin G responses by anti-CD48
Dorothy Yuan1, Yuhong Guo, Suwannee Thet
1Department of Pathology, UT Southwestern Medical Center, Dallas, TX 75230, USA. dorothy.yuan @ utsouthwestern.edu
Insights
Activating CD48 with antibodies enhances antibody responses to pathogens like Streptococcus pneumoniae. This enhancement involves natural killer (NK) cells in some mice, but not others, highlighting innate immune cell roles.
Area of Science:
- Immunology
- Cell Biology
- Infectious Disease
Background:
- CD48 is a cell surface protein that modulates immune cell interactions.
- CD48 influences cell activation through its ligands, CD2 and CD244.
- Understanding CD48's role is crucial for developing strategies against pathogens.
Purpose of the Study:
- To investigate the effect of anti-CD48 antibodies on antibody responses.
- To determine the cellular mechanisms underlying CD48-mediated immune modulation.
- To explore CD48's role in T-independent antigen responses.
Main Methods:
- Administration of anti-CD48 antibodies to mice.
- Assessment of antibody responses to NP-Ficoll antigen.
- Analysis of immune cell involvement (NK cells, T cells) in C57BL/6 and BALB/C mice.
Main Results:
- Anti-CD48 antibodies augmented antibody responses to NP-Ficoll.
- Enhancement in C57BL/6 mice required natural killer (NK) cells and CD48 ligands.
- In BALB/C mice, the augmentation was independent of NK or T cells, suggesting alternative innate cell involvement.
Conclusions:
- CD48 activation can significantly influence antigen-specific antibody production.
- The mechanism involves innate immune cells, with variations between mouse strains.
- CD48 represents a potential target for modulating immune responses against pathogens.
Abstract:
CD48 is a glycosylphosphatidylinositol-anchored protein expressed ubiquitously on many cell types. Despite the poor ability to signal on its own, CD48 can activate cells via interaction with its counter receptors CD2 and CD244 as well as influence the function of other cell surface molecules by costimulatory activities. We show, herein, that injection of anti-CD48 antibodies into mice can augment the antibody response to a T-independent antigen, NP-Ficoll, that is representative of antigenic determinants expressed on the surface of various pathogens, such as Streptococcus pneumoniae. In C57BL/6 mice, enhancement of the response is dependent on natural killer (NK) cells as well as on the presence of CD2 and CD244, ligands for CD48, suggesting a requirement for direct interaction between NK and B cells. Interestingly, in this case, despite a similar augmentation by anti-CD48 in BALB/C mice, the response is independent of NK or T cells, suggesting that help for this response can be derived from other innate cell types. These results provide a pathway by which CD48, when appropriately activated, can influence the course of an antigen-specific antibody response via the innate system.
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