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Erschienen in: Sleep and Breathing 3/2022

11.10.2021 | Sleep Breathing Physiology and Disorders • Original Article

Polymorphonuclear neutrophils promote endothelial apoptosis by enhancing adhesion upon stimulation by intermittent hypoxia

verfasst von: Jinna Li, Le Wang, Jie Hu, Xing Chen, Wei Zhou, Shuo Li, Hengjuan Guo, Yan Wang, Baoyuan Chen, Jing Zhang, Jie Cao

Erschienen in: Sleep and Breathing | Ausgabe 3/2022

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Abstract

Purpose

This study explored the interactive effects between polymorphonuclear neutrophils (PMNs) and vascular endothelial cells under intermittent hypoxia (IH) and investigated the mechanisms underlying these effects.

Methods

Endothelial cells were co-cultured with PMNs isolated from rats exposed to normoxia or IH. The PMN apoptotic rate was determined using flow cytometry. Expression of apoptosis-related proteins in the endothelial cells were evaluated using Western blotting, and the levels of intercellular adhesion molecules in the co-culture supernatants were measured using enzyme-linked immunosorbent assay.

Results

The PMN apoptotic rate in the IH-exposed rat group was significantly lower than that of the normoxia control group. There was a positive relationship between the PMN apoptotic rate and IH exposure time. In endothelial cells co-cultured with PMNs isolated from IH-exposed rats, a significant increase in the protein expression levels of Bax, Bcl-2, and caspase-3 and a significant decrease in the Bcl-2/Bax ratio were observed. Furthermore, the intercellular cell adhesion molecule-1(ICAM-1) and E-select element (E-S) levels were elevated significantly in the co-cultured supernatants of endothelial cells and PMNs from IH-exposed rats compared to that from controls. The above IH-induced alterations were partially restored by tempol pretreatment.

Conclusions

The apoptotic rate was low in PMNs from IH-exposed rats, which consequently increased the apoptotic signals in endothelial cells in vitro. This may be associated with the increased levels of intercellular adhesion molecules. Further, tempol partially attenuates the PMN-mediated pro-apoptotic effects on endothelial cells under IH.
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Metadaten
Titel
Polymorphonuclear neutrophils promote endothelial apoptosis by enhancing adhesion upon stimulation by intermittent hypoxia
verfasst von
Jinna Li
Le Wang
Jie Hu
Xing Chen
Wei Zhou
Shuo Li
Hengjuan Guo
Yan Wang
Baoyuan Chen
Jing Zhang
Jie Cao
Publikationsdatum
11.10.2021
Verlag
Springer International Publishing
Erschienen in
Sleep and Breathing / Ausgabe 3/2022
Print ISSN: 1520-9512
Elektronische ISSN: 1522-1709
DOI
https://doi.org/10.1007/s11325-021-02503-z

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