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

Nuclear factor of activated T-cells (NFAT) is a family of five transcription factors (NFATc1, NFATc2, NFATc3, NFATc4, and NFAT5) that serve as master regulators of the immune response and various developmental processes [1, 12]. In the canonical signaling pathway, an increase in intracellular calcium levels activates the phosphatase calcineurin, which dephosphorylates NFAT proteins, triggering their translocation from the cytoplasm to the nucleus where they initiate the transcription of target genes such as interleukin-2 (IL-2) and TNF-alpha [1, 9]. Beyond its role in T-cell activation, NFAT signaling is involved in the development of the cardiac, skeletal, and nervous systems, as well as in the regulation of cell cycle progression and apoptosis [2, 7]. Dysregulation of NFAT-dependent transcription is implicated in a wide range of pathologies, including autoimmune diseases, organ transplant rejection, and various cancers where it promotes angiogenesis and metastasis [3, 5]. Pharmacologically, the NFAT pathway is the primary target of calcineurin inhibitors like cyclosporine A and tacrolimus, which are cornerstone therapies for immunosuppression [4, 19]. However, the broad expression of NFAT across different tissues leads to significant therapeutic challenges, including nephrotoxicity and neurotoxicity, prompting research into more selective isoform-specific inhibitors [20, 21].

Other names

NF-ATNuclear factor of activated T-lymphocytesNFATcNFATp

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