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Updated: Jul 4, 2026
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Interview: Glycolipid Antigen Presentation by CD1d and the Therapeutic Potential of NKT cell Activation
Published on: December 31, 2007
NK T cells provide lipid antigen-specific cognate help for B cells
Elizabeth A Leadbetter1, Manfred Brigl, Petr Illarionov
1Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital, Harvard Medical School, 1 Jimmy Fund Way, Boston, MA 02115, USA.
Summary
Invariant natural killer T (iNKT) cells and B cells collaborate to generate antilipid antibody responses. This cooperation is crucial for understanding infections, autoimmune diseases, and vaccine development.
Area of Science:
- Immunology
- Cellular Biology
- Glycobiology
Background:
- Mechanisms of T cell help for antilipid antibody production remain largely unknown.
- Invariant natural killer T (iNKT) cells are crucial immune regulators.
- B cell responses are central to antibody-mediated immunity.
Purpose of the Study:
- To investigate the role of iNKT cells in providing help for antilipid antibody production.
- To elucidate the cooperative mechanisms between iNKT cells and B cells in response to lipid antigens.
- To establish a model for studying iNKT cell-B cell interactions in antibody responses.
Main Methods:
- Utilized a haptenated lipid molecule (NP-alphaGalCer) as a model antigen.
- Employed in vivo immunization and in vitro coculture systems.
- Used gene-deficient mice (CD1d-/-, Jalpha18-/-, CD4-/-) to assess the roles of specific molecules and cell types.
- Analyzed B cell proliferation and antibody isotype production (IgM, IgG3, IgG2c).
- Investigated the involvement of marginal zone and follicular B cells.
Main Results:
- iNKT cells provide cognate help to B cells presenting lipid antigens, leading to B cell proliferation and IgG anti-NP production.
- The response is dependent on CD1d and Jalpha18, but not CD4.
- Antibody response is dominated by IgM, IgG3, and IgG2c isotypes.
- Marginal zone B cells show enhanced proliferation compared to follicular B cells.
- iNKT cell help involves CD40L, B7-1/B7-2, and IFN-gamma, but not IL-4.
Conclusions:
- iNKT cells and B cells cooperate in antilipid antibody production.
- This interaction is mediated by CD1d-restricted iNKT cells and involves specific molecular signals.
- The findings provide a model for understanding antibody responses to lipid antigens, with implications for infectious diseases, autoimmunity, and vaccine design.
- Identified key molecular pathways (CD40L, B7-1/B7-2, IFN-gamma) involved in iNKT cell-mediated B cell help.
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