Store-operated Ca2+ release-activated Ca2+ channels regulate PAR2-activated Ca2+ signaling and cytokine production in airway epithelial cells

Amit Jairaman, Megumi Yamashita, Robert P. Schleimer, Murali Prakriya*

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

The G-protein-coupled protease-activated receptor 2 (PAR2) plays an important role in the pathogenesis of various inflammatory and auto-immune disorders. In airway epithelial cells (AECs), stimulation of PAR2 by allergens and proteases triggers the release of a host of inflammatory mediators to regulate bronchomotor tone and immune cell recruitment. Activation of PAR2 turns on several cell signaling pathways of which the mobilization of cytosolic Ca2+ is likely a critical but poorly understood event. In this study, we show that Ca2+ release-activated Ca2+ (CRAC) channels encoded by stromal interaction molecule 1 and Orai1 are a major route of Ca2+ entry in primary human AECs and drive the Ca2+ elevations seen in response to PAR2 activation. Activation of CRAC channels induces the production of several key inflammatory mediators from AECs including thymic stromal lymphopoietin, IL-6, and PGE2, in part through stimulation of gene expression via nuclear factor of activated T cells (NFAT). Furthermore, PAR2 stimulation induces the production of many key inflammatory mediators including PGE2, IL-6, IL-8, and GM-CSF in a CRAC channel-dependent manner. These findings indicate that CRAC channels are the primary mechanism for Ca2+ influx in AECs and a vital checkpoint for the induction of PAR2-induced proinflammatory cytokines.

Original languageEnglish (US)
Pages (from-to)2122-2133
Number of pages12
JournalJournal of Immunology
Volume195
Issue number5
DOIs
StatePublished - Sep 1 2015

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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