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ZM 39923 is a selective inhibitor of JAK1 and JAK3 with pIC50 value of 4.4 and 7.1, respectively [1] [2].

JAK (Janus kinase) is a member of intracellular, non-receptor tyrosine kinases family and plays a pivotal role in transducing cytokine-mediated signals via the JAK-STAT pathway. It has been shown that type I and type II cytokine receptor families rely on the JAK family to phosphorylate and activate downstream proteins involved in their signal transduction pathways. Considering the biological function of JAK, a veraity of JAK inhibitors have been developed and mainly used for screening blood system disease, tumor, rheumatoid arthritis and psoriasis treatment [2] [3].

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