Nezulcitinib

**Semantic type:** Pharmacologic Substance

**Definition:** A lung-selective inhibitor of the Janus associated-kinases (JAKs), with potential immunomodulatory and anti-inflammatory activities. Upon administration via nebulized inhalation, nezulcitinib inhibits the activity of the JAKs, thereby disrupting cytokine-induced activation of JAK-STAT signaling pathways in the airways. This may inhibit the release of pro-inflammatory cytokines and chemokines, reducing inflammatory responses and preventing inflammation-induced damage. The Janus kinase family of non-receptor tyrosine kinases, which includes tyrosine-protein kinase JAK1 (Janus kinase 1; JAK1), tyrosine-protein kinase JAK2 (Janus kinase 2; JAK2), tyrosine-protein kinase JAK3 (Janus kinase 3; JAK3) and non-receptor tyrosine-protein kinase TYK2 (tyrosine kinase 2), plays a key role in cytokine signaling.

**Synonyms:** - JAK1/JAK2/JAK3/TYK2 Inhibitor TD-0903 - NEZULCITINIB - TD 0903 - TD-0903 - TD0903