Tofacitinib

**Semantic type:** Pharmacologic Substance

**Definition:** An orally available inhibitor of Janus kinases (JAK), with immunomodulatory and anti-inflammatory activities. Upon administration, tofacitinib binds to JAK and prevents the activation of the JAK-signal transducers and activators of transcription (STAT) signaling pathway. This may decrease the production of pro-inflammatory cytokines, such as interleukin (IL)-6, -7, -15, -21, interferon-alpha and -beta, and may prevent both an inflammatory response and the inflammation-induced damage caused by certain immunological diseases. JAK kinases are intracellular enzymes involved in signaling pathways affecting hematopoiesis, immunity and inflammation.

**Synonyms:** - 3-((3R,4R)-4-Methyl-3-(Methyl(7H-Pyrrolo(2,3-D)Pyrimidin-4-yl)Amino)Piperidin-1-yl)-3-Oxopropanenitrile - CP 690550 - CP-690,550 Free Base - CP-690550 - CP690550 - JAK inhibitors: tofacitinib - TOFACITINIB - Tasocitinib