T helper 17 cell differentiation pathway (Th17 differentiation pathway)

The T helper 17 cell differentiation pathway is a cytokine-driven sequence of signaling events and gene regulation, converting naïve CD4+ T lymphocytes into Th17 effector cells. Key signals include TGF-β combined with IL-6, leading to the activation of pivotal transcription factors such as RORγt, STAT3, BATF, and IRF4. This pathway is tightly regulated by additional cytokines and transcription factors, with positive signals (IL-1, IL-23, IL-21) and multiple negative feedback loops (IL-4, IFN-γ, IL-27, retinoic acid). Th17 cells play important roles in host defense against fungi and extracellular bacteria, but their aberrant activation is central to autoimmune diseases like multiple sclerosis, rheumatoid arthritis, and psoriasis. Drug development efforts mainly target central molecules within this pathway (e.g., RORγt, IL-17A, IL-23), not the pathway as a whole.

Other names

Th17 cell polarization pathwayTh17 lineage commitment pathwayTh17 differentiation cascadeCD4+ T cell IL-17 differentiation pathway

Inhibition of cytokine signaling (e.g., targeting IL-17A, IL-23, or JAK/STAT pathway prevents Th17 cell differentiation and function); Direct inhibition of lineage-defining transcription factors (e.g., RORγt)