NFAT pulls the strings during CD4+ T helper cell effector functions.

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• Nuclear Factor of Activated T cells (NFAT) is a calcium-dependent transcription factor family vital for T-cell immune responses.
• NFAT proteins exhibit weak DNA-binding, necessitating cooperation with other transcription factors at composite gene promoter sites.

Purpose of the Study:

• To review the critical role of NFAT interactions in CD4(+) T helper cell differentiation and effector functions.
• To elucidate the established transcriptional partners and functional outcomes of NFAT signaling in T helper cell subsets.

Main Methods:

• Literature review focusing on NFAT's role in T-cell activation and differentiation.
• Analysis of NFAT's transcriptional regulation of lineage-specific transcription factors (T-bet, Gata3, RORgammat, Foxp3).
• Examination of NFAT's control over signature cytokines and their receptors.

Main Results:

• NFAT is essential for inducing genetic programs that guide CD4(+) T helper subset differentiation (Th1, Th2, Th17, iTregs).
• NFAT regulates key transcription factors like T-bet, Gata3, RORgammat, and Foxp3.
• NFAT controls the expression of critical cytokines and cytokine receptors involved in T helper cell function.

Conclusions:

• NFAT integrates T-cell receptor signaling with other immune receptor pathways to determine T helper cell differentiation and function.
• Understanding NFAT interactions is crucial for comprehending effector responses in clinically relevant CD4(+) T helper subsets.