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.

Abstract:

: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 (Jak-STAT) pathway may be involved. Dominant negative studies further indicate that STAT6, but not other STATs, 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 STAT6 response elements. Finally, chromatin immunoprecipitation assay studies indicate that IL-4 increases the binding of STAT6 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.

journal_name

Immunology

journal_title

Immunology

authors

Bao L,Alexander JB,Shi VY,Mohan GC,Chan LS

doi

10.1111/imm.12339

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

601-8

issue

4

eissn

0019-2805

issn

1365-2567

journal_volume

143

pub_type

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