例如:"lncRNA", "apoptosis", "WRKY"

Interleukin-4 up-regulation of epidermal interleukin-19 expression in keratinocytes involves the binding of signal transducer and activator of transcription 6 (Stat6) to the imperfect Stat6 sites.

Immunology. 2014 Dec;143(4):601-8. doi:10.1111/imm.12339
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摘要


Interleukin-19 (IL-19) plays an important role in asthma by stimulating T helper type 2 (Th2) cytokine production. Interestingly, IL-4, a key Th2 cytokine, in turn up-regulates IL-19 expression in bronchial epithelial cells, so forming a positive feedback loop. In atopic dermatitis (AD), another Th2 disease closely related to asthma, IL-19 is up-regulated in the skin. We propose to use IL-4 transgenic (Tg) mice and human keratinocyte culture to delineate the molecular mechanisms involved in the up-regulation of IL-19 in AD. IL-19 is similarly up-regulated in the skin of IL-4 Tg mice as in human AD. Next we show that IL-4 up-regulates IL-19 expression in keratinocytes. Interestingly, the up-regulation was suppressed by a pan-Janus kinase (Jak) inhibitor, suggesting that the Jak-signal transducer and activator of transcription pathway may be involved. Dominant negative studies further indicate that but not other mediates the up-regulation. Serial 5' deletion of the IL-19 promoter and mutagenesis studies demonstrate that IL-4 up-regulation of IL-19 in keratinocytes involves two imperfect response elements. Finally, chromatin immunoprecipitation assay studies indicate that IL-4 increases the binding of duanyu18136 to its response elements in the IL-19 promoter. Taken together, we delineate the detailed molecular pathway for IL-4 up-regulation of IL-19 in keratinocytes, which may play an important role in AD pathogenesis.

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