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Published in: Sleep and Breathing 4/2019

Open Access 01-12-2019 | Sleep Apnea | Sleep Breathing Physiology and Disorders • Original Article

Monocytic C-C chemokine receptor 5 expression increases in in vitro intermittent hypoxia condition and in severe obstructive sleep apnea patients

Authors: Li-Pang Chuang, Ning-Hung Chen, Shih-Wei Lin, Han-Chung Hu, Kuo-Chin Kao, Li-Fu Li, Cheng-Ta Yang, Chung-Chi Huang, Jong-Hwei S. Pang

Published in: Sleep and Breathing | Issue 4/2019

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Abstract

Purpose

Obstructive sleep apnea (OSA) patients have higher risk of cardiovascular disease. C-C chemokine receptor 5 (CCR5), as an important receptor for monocyte recruitment and the initiation of atherosclerosis, was studied under intermittent hypoxia and in OSA patients.

Methods

The expression and function of CCR5 regulated by intermittent hypoxia in monocytic THP-1 cells were investigated in an in vitro intermittent hypoxia culture system. The expression levels of protein and mRNA were analyzed by western blot and RT/real-time PCR analysis. Cell adhesion assay and transwell filter migration assay were carried out to investigate the adhesion and chemotaxis of monocytes. In addition, the mRNA expression of CCR5 in monocytes isolated from peripheral blood of 72 adults was analyzed.

Results

Intermittent hypoxia upregulated the expression of CCR5 in THP-1 cells and enhanced the adhesion and chemotaxis of monocytes to vascular endothelial cells mediated by RANTES. The CCR5 expression induced by intermittent hypoxia was inhibited by inhibitor for p42/44 MAPK. Besides, the expression of CCR5 in monocytes increased along the AHI value especially in severe OSA patients that was statistically significant compared with mild and moderate OSA groups.

Conclusions

This study demonstrated the increased monocytic CCR5 gene expression in patients with severe OSA. Intermittent hypoxia, the characteristic of OSA, induced monocytic CCR5 gene expression and the enhanced RANTES-mediated chemotaxis and adhesion through p42/44 MAPK signal pathways.
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Metadata
Title
Monocytic C-C chemokine receptor 5 expression increases in in vitro intermittent hypoxia condition and in severe obstructive sleep apnea patients
Authors
Li-Pang Chuang
Ning-Hung Chen
Shih-Wei Lin
Han-Chung Hu
Kuo-Chin Kao
Li-Fu Li
Cheng-Ta Yang
Chung-Chi Huang
Jong-Hwei S. Pang
Publication date
01-12-2019
Publisher
Springer International Publishing
Published in
Sleep and Breathing / Issue 4/2019
Print ISSN: 1520-9512
Electronic ISSN: 1522-1709
DOI
https://doi.org/10.1007/s11325-019-01797-4

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