Retinoic acid receptor-related orphan receptor gamma t (RORγt) (RORγt)

Retinoic acid receptor-related orphan receptor gamma t (RORγt) is a key transcription factor and a member of the nuclear receptor superfamily, specifically the NR1F3 isoform of the RORC gene [Journal of Medicinal Chemistry, Wikipedia]. It is primarily expressed in specialized immune cells, including T helper 17 (Th17) cells, γδ T cells, and type 3 innate lymphoid cells (ILC3), where it acts as the master regulator for the production of pro-inflammatory cytokines such as IL-17 and IL-22 [NIH/PMC]. RORγt is also essential for the development of secondary lymphoid organs and the survival of thymocytes during T-cell maturation [NIH/PMC, ResearchGate]. Due to its central role in driving Th17-mediated inflammation, RORγt is a major therapeutic target for autoimmune conditions such as psoriasis, rheumatoid arthritis, and multiple sclerosis, with several inverse agonists in clinical development [Wikipedia, NIH/PMC]. Conversely, RORγt agonists are being explored in immuno-oncology to enhance anti-tumor immune responses by stimulating Th17 and Tc17 cell activity [Wikidoc, NIH/PMC]. However, therapeutic modulation of RORγt carries potential safety concerns, including impacts on thymic health and a theoretical risk of lymphomagenesis observed in preclinical models [MDPI, NIH/PMC].

Other names

RORCNR1F3RORGRZR-GAMMARZRGTORRAR-related orphan receptor gammaIMD42RAR related orphan receptor CRORγ2

RORγt is a ligand-dependent transcription factor that regulates gene expression by binding to ROR response elements (ROREs) as a monomer [Wikipedia, NIH/PMC]. Upon activation by endogenous oxysterol ligands or synthetic agonists, the receptor recruits coactivators such as steroid receptor coactivator-1 (SRC-1), which promotes the transcription of pro-inflammatory cytokines like IL-17A, IL-17F, and IL-22 [Journal of Medicinal Chemistry, NIH/PMC]. Inverse agonists function by binding to the ligand-binding domain (LBD) and inducing a conformational change that either prevents coactivator recruitment or promotes the recruitment of corepressors (e.g., NCoR), thereby suppressing Th17 cell differentiation and inflammatory cytokine production [Journal of Medicinal Chemistry, NIH/PMC].