Signaling pathways mediating chemokine induction in keratinocytes by cathelicidin LL-37 and flagellin.

ABSTRACT: Cathelicidin LL-37 is a multifunctional immunomodulatory and antimicrobial host defense peptide that has an important role in the immune defenses of the skin and other epithelial barriers. We have previously demonstrated that at physiological concentrations LL-37 synergistically augments the production of immune mediators in response to microbial compounds in human primary keratinocytes. Here we define the signaling mechanisms responsible for this activity. We demonstrate that inhibition of Src family kinases (SFKs) strongly inhibited the synergistic chemokine production in response to LL-37 and flagellin in keratinocytes. SFK activation was induced by LL-37 stimulation and was required for the downstream activation of Akt (protein kinase B) and the transcription factors CREB and ATF1. In

SUBMITTER: Nijnik A 

PROVIDER: S-EPMC6741628 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature