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Published in: Respiratory Research 1/2021

01-12-2021 | Mites | Research

PGC-1α regulates airway epithelial barrier dysfunction induced by house dust mite

Authors: Tsutomu Saito, Tomohiro Ichikawa, Tadahisa Numakura, Mitsuhiro Yamada, Akira Koarai, Naoya Fujino, Koji Murakami, Shun Yamanaka, Yusaku Sasaki, Yorihiko Kyogoku, Koji Itakura, Hirohito Sano, Katsuya Takita, Rie Tanaka, Tsutomu Tamada, Masakazu Ichinose, Hisatoshi Sugiura

Published in: Respiratory Research | Issue 1/2021

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Abstract

Background

The airway epithelial barrier function is disrupted in the airways of asthmatic patients. Abnormal mitochondrial biogenesis is reportedly involved in the pathogenesis of asthma. However, the role of mitochondrial biogenesis in the airway barrier dysfunction has not been elucidated yet. This study aimed to clarify whether the peroxisome proliferator-activated receptor γ coactivator-1alpha (PGC-1α), a central regulator of mitochondrial biogenesis, is involved in the disruption of the airway barrier function induced by aeroallergens.

Methods

BEAS-2B cells were exposed to house dust mite (HDM) and the expressions of PGC-1α and E-cadherin, a junctional protein, were examined by immunoblotting. The effect of SRT1720, a PGC-1α activator, was investigated by immunoblotting, immunocytochemistry, and measuring the transepithelial electrical resistance (TEER) on the HDM-induced reduction in mitochondrial biogenesis markers and junctional proteins in airway bronchial epithelial cells. Furthermore,the effects of protease activated receptor 2 (PAR2) inhibitor, GB83, Toll-like receptor 4 (TLR4) inhibitor, lipopolysaccharide from Rhodobacter sphaeroides (LPS-RS), protease inhibitors including E64 and 4-(2-Aminoethyl) benzenesulfonyl fluoride hydrochloride (AEBSF) on the HDM-induced barrier dysfunction were investigated.

Results

The amounts of PGC-1α and E-cadherin in the HDM-treated cells were significantly decreased compared to the vehicle-treated cells. SRT1720 restored the expressions of PGC-1α and E-cadherin reduced by HDM in BEAS-2B cells. Treatment with SRT1720 also significantly ameliorated the HDM-induced reduction in TEER. In addition, GB83, LPS-RS, E64 and AEBSF prevented the HDM-induced reduction in the expression of PGC1α and E-cadherin.

Conclusions

The current study demonstrated that HDM disrupted the airway barrier function through the PAR2/TLR4/PGC-1α-dependent pathway. The modulation of this pathway could be a new approach for the treatment of asthma.
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Literature
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Metadata
Title
PGC-1α regulates airway epithelial barrier dysfunction induced by house dust mite
Authors
Tsutomu Saito
Tomohiro Ichikawa
Tadahisa Numakura
Mitsuhiro Yamada
Akira Koarai
Naoya Fujino
Koji Murakami
Shun Yamanaka
Yusaku Sasaki
Yorihiko Kyogoku
Koji Itakura
Hirohito Sano
Katsuya Takita
Rie Tanaka
Tsutomu Tamada
Masakazu Ichinose
Hisatoshi Sugiura
Publication date
01-12-2021
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2021
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/s12931-021-01663-6

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