JAK1 binds IL4R in IL4-bound IL4R1

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Reaction [BlackBoxEvent]
Homo sapiens
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In human blood monocytes, where the type I interleukin-4 (IL4) receptor (IL4R1) is the predominant IL4 receptor type, IL4 leads to tyrosine phosphorylation of Janus kinase 1 (JAK1), rather than constitutively bound JAK2, JAK3 or Non-receptor associated tyrosine kinase 2 (TYK2). JAK1 was found to be essential for IL4-mediated expression of 15-lipoxygenase while JAK2 and TYK2 antisense inhibition had no effect (Bhattacharjee et al. 2013). As JAK1 binds IL4RA in response to IL13 binding (Roy et al. 2002), it is believed that IL4 similarly triggers binding of JAK1 to IL4 receptor complexes. The molecular trigger for JAK1 binding is not clear.

Literature References
PubMed ID Title Journal Year
12223527 IL-13 signal transduction in human monocytes: phosphorylation of receptor components, association with Jaks, and phosphorylation/activation of Stats

Roy, B, Ford, D, Maizel, AL, Cathcart, MK, Bhattacharjee, A, Xu, B

J. Leukoc. Biol. 2002
23124025 IL-4 and IL-13 employ discrete signaling pathways for target gene expression in alternatively activated monocytes/macrophages

Yakubenko, VP, Mulya, A, Cathcart, MK, Kundu, S, Bhattacharjee, A, Shukla, M

Free Radic. Biol. Med. 2013
Orthologous Events
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