Nuclear factor of activated T-cells (NFAT) signaling pathway (NFAT pathway)

The Nuclear factor of activated T-cells (NFAT) signaling pathway is a critical mediator of the immune response, primarily regulating the activation and proliferation of T-cells through the induction of cytokines like interleukin-2 (IL-2) [1, 2]. The pathway is initiated by an increase in intracellular calcium, which activates the phosphatase calcineurin; calcineurin then dephosphorylates NFAT proteins (NFATc1-c4), enabling their translocation from the cytoplasm to the nucleus to drive gene expression [2, 5]. Beyond its role in immunity, the NFAT pathway is essential for the development and function of the cardiovascular, musculoskeletal, and nervous systems [1, 3]. Clinically, this pathway is the primary target for calcineurin inhibitors such as cyclosporine A and tacrolimus, which are standard-of-care treatments for preventing organ transplant rejection and managing autoimmune conditions like rheumatoid arthritis and psoriasis [5, 11]. However, the broad expression of pathway components leads to significant safety concerns, most notably nephrotoxicity and neurotoxicity [5, 11]. Emerging research also implicates dysregulated NFAT signaling in cancer progression, where it promotes tumor angiogenesis, metastasis, and chemoresistance [4, 13].

Other names

NF-AT signalingCalcineurin-NFAT pathwayCa2+/calcineurin/NFAT pathwayNuclear factor of activated T-lymphocytes pathway

Inhibition of calcineurin phosphatase activity, which prevents the dephosphorylation and nuclear translocation of NFAT transcription factors, thereby blocking the expression of pro-inflammatory cytokines such as interleukin-2 (IL-2).