AS1842856 is a selective inhibitor of the inducible T-cell kinase (ITK), which plays a key role in T-cell signaling and immune response regulation. It is primarily used in research settings to study T-cell activation and signaling pathways, especially in the context of autoimmune diseases and inflammatory conditions. By modulating ITK activity, AS1842856 helps investigate the suppression of pro-inflammatory cytokine production and T-helper cell differentiation. It has also been explored for its potential in reducing allergic responses and controlling immune-mediated tissue damage in experimental models. Due to its specificity, it serves as a valuable tool compound in immunology and drug discovery for developing targeted immunomodulatory therapies.