FVB/N mouse strain regulatory T cells differ in phenotype and function from the C57BL/6 and BALB/C strains

Area of Science:

• Immunology
• Cell Biology
• Genetics

Background:

• Regulatory T cells (Tregs) are crucial for maintaining immune homeostasis.
• Inbred mouse strain genetic background profoundly influences immune responses, including Treg function.
• Existing Treg research predominantly utilizes C57BL/6 and BALB/c mouse strains.

Purpose of the Study:

• To investigate and compare the functional capabilities of FVB/N Tregs against C57BL/6 and BALB/c Tregs.
• To elucidate the impact of genetic background on Treg phenotype, suppressive mechanisms, and cytokine production.

Main Methods:

• Comparative analysis of Treg function across FVB/N, C57BL/6, and BALB/c mouse strains.
• Assessment of Treg suppressive capacity in cell contact-dependent and soluble factor-dependent systems.
• Quantification of cytokine production (IL-10, TGF-β) and cell surface protein expression (GARP, LAP) and mRNA levels (Ctse).

Main Results:

• FVB/N Tregs exhibit normal suppression in cell contact-dependent systems but are less effective when soluble factors mediate regulation.
• FVB/N Tregs produce IL-10, while TGF-β was undetectable in C57BL/6 and FVB/N cultures.
• Significant differences in GARP, LAP, and Ctse expression were observed between strains, alongside varying thymic Treg (tTreg) stability and induced Treg (iTreg) generation.

Conclusions:

• Mouse strain genetic background dictates distinct Treg phenotypes and dominant suppressive mechanisms.
• These strain-specific Treg characteristics must be considered in future Treg research and therapeutic applications.
• Understanding genetic diversity in Treg function is vital for developing effective immunotherapies in varied populations.