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Differences in sleep-induced hypoxia between A/J and DBA/2J mouse strains.
Arnon E Rubin1, Vsevolod Y Polotsky, Alexander Balbir
1Division of Pulmonary and Critical Care Medicine, Department of Medicine, The Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21224, USA.
American Journal of Respiratory and Critical Care Medicine
|September 27, 2003
Summary
Genetic background influences sleep apnea outcomes. Mice with low hypoxic sensitivity experienced more severe hypoxia and sleep disruption, suggesting increased risk for related complications in humans.
Area of Science:
- Sleep Medicine
- Respiratory Physiology
- Genetics
Background:
- Obstructive sleep apnea (OSA) involves upper airway obstruction leading to hypoxia and sleep disruption.
- Hypoxic ventilatory sensitivity (HVS) may modulate the severity of these events.
- Genetic factors can influence HVS and subsequent OSA pathology.
Purpose of the Study:
- To investigate the impact of genetic background on respiratory events and sleep architecture during sleep-induced hypoxia (SIH) and sleep fragmentation (SF).
- To determine if differences in HVS between mouse strains affect the severity of hypoxic stress and sleep disruption.
- To assess the influence of circadian rhythms on arousal thresholds during SIH and SF.
Main Methods:
- Two inbred mouse strains with differing HVS (low: A/J, high: DBA/2J) were subjected to SIH or SF for 5 days.
- Respiratory events, hypoxic exposure severity, and sleep time were monitored.
- Arousal thresholds were measured during light/dark cycles.
Main Results:
- Mice with low HVS (A/J) exhibited greater hypoxic stress and sleep disruption during SIH compared to high HVS mice (DBA/2J).
- A/J mice showed a higher frequency of hypoxic events and increased total sleep time during SIH.
- SF did not reveal strain-dependent differences in event characteristics or sleep time.
- Arousal thresholds were longer during the light phase compared to the dark phase for both SIH and SF.
Conclusions:
- Genetic background significantly influences respiratory and sleep patterns during SIH.
- Arousal threshold demonstrates circadian variation, being higher during the light phase.
- Individuals with low HVS may face a heightened risk of hypoxia-related complications in OSA.