4.7 Review

Experimental Models to Study End-Organ Morbidity in Sleep Apnea: Lessons Learned and Future Directions

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MDPI
DOI: 10.3390/ijms232214430

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intermittent hypoxia; airway obstruction; sleep fragmentation; cell model; animal model; human model; oxygen supplementation; CPAP withdrawal; sleep apnea pathophysiology

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This review focuses on the experimental models used to study the consequences of sleep apnea (SA), including cell culture systems, animal models, and human SA models. The advantages, limitations, and relevant findings of these models are discussed.
Sleep apnea (SA) is a very prevalent sleep breathing disorder mainly characterized by intermittent hypoxemia and sleep fragmentation, with ensuing systemic inflammation, oxidative stress, and immune deregulation. These perturbations promote the risk of end-organ morbidity, such that SA patients are at increased risk of cardiovascular, neurocognitive, metabolic and malignant disorders. Investigating the potential mechanisms underlying SA-induced end-organ dysfunction requires the use of comprehensive experimental models at the cell, animal and human levels. This review is primarily focused on the experimental models employed to date in the study of the consequences of SA and tackles 3 different approaches. First, cell culture systems whereby controlled patterns of intermittent hypoxia cycling fast enough to mimic the rates of episodic hypoxemia experienced by patients with SA. Second, animal models consisting of implementing realistic upper airway obstruction patterns, intermittent hypoxia, or sleep fragmentation such as to reproduce the noxious events characterizing SA. Finally, human SA models, which consist either in subjecting healthy volunteers to intermittent hypoxia or sleep fragmentation, or alternatively applying oxygen supplementation or temporary nasal pressure therapy withdrawal to SA patients. The advantages, limitations, and potential improvements of these models along with some of their pertinent findings are reviewed.

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