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Journal of Inflammation
Published in: Journal of Inflammation 1/2019

Open Access 01-12-2019 | Bronchial Asthma | Research

Extracellular acidification-induced CXCL8 production through a proton-sensing receptor OGR1 in human airway smooth muscle cells: a response inhibited by dexamethasone

Authors: Maiko Kadowaki, Hidenori Yamada, Koichi Sato, Hiroko Shigemi, Yukihiro Umeda, Miwa Morikawa, Yuko Waseda, Masaki Anzai, Yosuke Kamide, Haruka Aoki-Saito, Takeshi Hisada, Fumikazu Okajima, Tamotsu Ishizuka

Published in: Journal of Inflammation | Issue 1/2019

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Abstract

Background

Human airway smooth muscle cells (ASMCs) contribute to bronchial contraction and airway hyperresponsiveness in patients with bronchial asthma. They also generate cytokines, chemokines, and matricellular proteins. Ovarian cancer G protein-coupled receptor 1 (OGR1) senses extracellular protons and mediates the production of interleukin-6 (IL-6) and connective tissue growth factor (CTGF) in ASMCs.

Methods

ASMCs were stimulated for the indicated time by pH 6.3 or pH 7.4-adjusted Dulbecco’s Modified Eagle Medium (DMEM) containing 0.1% bovine serum albumin (BSA) (0.1% BSA-DMEM). As a control stimulant, pH 7.4-adjusted 0.1% BSA-DMEM containing 10 ng/mL tumor necrosis factor-α (TNF-α) was used. Interleukin-8/C-X-C motif chemokine ligand 8 (CXCL8) mRNA expression in ASMCs was quantified by RT-PCR using real-time TaqMan technology. CXCL8 secreted from ASMCs was measured by enzyme-linked immunosorbent assay (ELISA). Phosphorylation at serine 536 of NF-κB p65 and binding of p65 to oligonucleotide containing an NF-κB consensus binding site were analyzed by Western blotting and an ELISA-based kit.

Results

Acidic pH induced a significant increase of CXCL8 mRNA expression and CXCL8 protein secretion in ASMCs. ASMCs transfected with small interfering RNA (siRNA) targeted for OGR1 produced less CXCL8 compared with those transfected with non-targeting siRNA. Protein kinase C (PKC) inhibitor, MEK1/2 inhibitor, and the inhibitor of IκB phosphorylation reduced acidic pH-stimulated CXCL8 production in ASMCs. Dexamethasone also inhibited acidic pH-stimulated CXCL8 production of ASMCs in a dose-dependent manner. Dexamethasone did not affect either phosphorylation or binding to the consensus DNA site of NF-κB p65.

Conclusions

CXCL8 released from ASMCs by extracellular acidification may play a pivotal role in airway accumulation of neutrophils. Glucocorticoids inhibit acidic pH-stimulated CXCL8 production independent of serine 536 phosphorylation and the binding to DNA of NF-κB p65, although NF-κB activity is essential for CXCL8 production in ASMCs.
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Metadata
Title
Extracellular acidification-induced CXCL8 production through a proton-sensing receptor OGR1 in human airway smooth muscle cells: a response inhibited by dexamethasone
Authors
Maiko Kadowaki
Hidenori Yamada
Koichi Sato
Hiroko Shigemi
Yukihiro Umeda
Miwa Morikawa
Yuko Waseda
Masaki Anzai
Yosuke Kamide
Haruka Aoki-Saito
Takeshi Hisada
Fumikazu Okajima
Tamotsu Ishizuka
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Journal of Inflammation / Issue 1/2019
Electronic ISSN: 1476-9255
DOI
https://doi.org/10.1186/s12950-019-0207-1

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