Widespread natural variation in murine natural killer T-cell number and function

Area of Science:

• Immunology
• T-cell subsets

Background:

• Natural killer T (NKT) cells are crucial immune regulators.
• NKT cell variation is studied in autoimmune models, but less in normal strains.
• Understanding natural variation is key to interpreting NKT cell roles in immunity.

Purpose of the Study:

• To investigate natural variation in NKT cell number and function among inbred mouse strains.
• To determine if NKT cell differences correlate with susceptibility to NKT-mediated airway hyperreactivity.
• To explore the implications of this variability for immune response and disease pathogenesis studies.

Main Methods:

• Compared NKT cell responses in C57BL/6J and BALB/cJ mice after alpha-galactosylceramide stimulation.
• Assessed serum cytokine levels (IL-4, IL-13) and NKT cell cytokine production.
• Examined NKT cell frequency in livers across multiple inbred mouse strains.

Main Results:

• Demonstrated strain-dependent variation in NKT-mediated airway hyperreactivity.
• Observed significant differences in NKT cell cytokine production (frequency and kinetics) between C57BL/6J and BALB/cJ mice.
• Found widespread variability in NKT cell cytokine production and liver NKT cell numbers across various inbred strains, with a >100-fold range in liver NKT cell counts.

Conclusions:

• Widespread natural variation in NKT cell number and function exists among common inbred mouse strains.
• This variability has significant implications for studying NKT cell influence on immune responses and disease.
• Genetic background must be considered when examining NKT cell roles in different mouse models.