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A Janus kinase inhibitor, also known as JAK inhibitor or jakinib, [1] is a type of immune modulating medication, which inhibits the activity of one or more of the Janus kinase family of enzymes (JAK1, JAK2, JAK3, TYK2), thereby interfering with the JAK-STAT signaling pathway in lymphocytes.
Janus kinase 3 inhibitors, also called JAK3 inhibitors, are a new class of immunomodulatory agents that inhibit Janus kinase 3. They are used for the treatment of autoimmune diseases . The Janus kinases are a family of four nonreceptor tyrosine-protein kinases, JAK1 , JAK2 , JAK3 , and TYK2 .
Janus kinase (JAK) is a family of intracellular, non-receptor tyrosine kinases that transduce cytokine-mediated signals via the JAK-STAT pathway. They were initially named " just another kinase " 1 and 2 (since they were just two of many discoveries in a PCR -based screen of kinases), [ 1 ] but were ultimately published as "Janus kinase".
Ritlecitinib is a kinase inhibitor which inhibits Janus kinase 3 and tyrosine kinase. [6] [9] [10] The most common side effects include headache, diarrhea, acne, rashes, eczema, fever, mouth ulcers, dizziness, shingles rash, and abnormal findings in some laboratory test results. [11]
Baricitinib is a Janus kinase (JAK) inhibitor that reversibly inhibits Janus kinase 1 with a half maximal inhibitory concentration (IC 50) of 5.9 nM and Janus kinase 2 with an IC 50 of 5.7 nM. Tyrosine kinase 2 , which belongs to the same enzyme family, is affected less (IC 50 = 53 nM), and Janus kinase 3 far less (IC 50 > 400 nM).
If JAK inhibitors can show similarly impressive results, gain approval, and make a splash, then these blockbuster biologics could have some real competition. While the future is promising that "if ...
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