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Updated: May 29, 2026
13:27
Generation of Human CD40-activated B cells
Published on: October 16, 2009
CD40L-null NKT cells provide B cell help for specific antibody responses
Hemangi B Shah1, Sunil K Joshi, Mark L Lang
1Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, United States.
Vaccine
|October 1, 2011
Summary
Natural killer T (NKT) cells influence antibody production. CD40 ligand-deficient NKT cells enhance antibody titers, but require T helper cells to provide help for B cell activation.
Area of Science:
- Immunology
- Cellular and Molecular Immunology
- Vaccinology
Background:
- CD1d-binding glycolipids enhance T-dependent antibody (Ab) responses through interactions between CD1d-expressing B cells and T cell receptor (TCR)-expressing Type I CD1d-restricted natural killer T cells (NKTs).
- The specific NKT-derived factors that stimulate B cells remain largely unknown, hindering a complete understanding of their role in humoral immunity.
Purpose of the Study:
- To investigate the role of CD40 ligand (CD40L) expressed by NKT cells in modulating humoral immunity.
- To test the hypothesis that CD40L expression on NKT cells influences T-dependent Ab production.
Main Methods:
- Utilized bone marrow chimeras with NKT cells expressing either wild-type (CD40L+/+) or deficient (CD40L-/-) CD40L.
- Immunized chimeric mice with antigen plus a CD1d ligand.
- Measured Ab responses, including endpoint Ab titers, and assessed B cell help provided by NKT and T helper (Th) cells.
Main Results:
- NKT cells deficient in CD40L (CD40L-/-) stimulated significantly higher endpoint Ab titers compared to controls expressing CD40L.
- However, CD40L-/- NKT cells were unable to provide B cell help in mice lacking CD40L on their T helper cells, indicating a cooperative mechanism.
- CD40L-/- NKT cells can provide help for Ab production, but this help is cooperative with CD40L(+/+) Th cells.
Conclusions:
- NKT cells provide B cell help through mechanisms distinct from those of conventional T helper cells.
- CD40L expression on NKT cells plays a complex role in humoral immunity, with CD40L deficiency on NKT cells leading to enhanced Ab production under specific conditions.
- The findings suggest a cooperative interaction between NKT cells and Th cells, mediated by CD40L, in regulating Ab responses.
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