The impact of chronic intermittent hypoxia on enzymatic activity in memory-associated brain regions of male and female rats
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View abstract on PubMed
Summary
This summary is machine-generated.Chronic intermittent hypoxia (CIH), a model for obstructive sleep apnea (OSA), impairs learning and memory by altering protease activity and neuronal function. These effects are sex-specific and brain region-dependent, highlighting distinct vulnerabilities in males and females.
Area Of Science
- Neuroscience
- Physiology
- Pathology
Background
- Obstructive sleep apnea (OSA) is linked to cognitive deficits, including memory impairment.
- Mechanisms underlying OSA-induced cognitive dysfunction are not fully understood.
- Sex and brain region specificity may influence protease activity and neuronal activation in OSA.
Purpose Of The Study
- To investigate the impact of chronic intermittent hypoxia (CIH), a rat model of OSA, on protease activity and neuronal activation.
- To examine these changes in brain regions critical for learning and memory.
- To determine if these alterations are sex- and region-specific.
Main Methods
- Male and female rats were exposed to CIH or normoxia for 14 days.
- Protease activity (calpain, caspase-3) and EGR-1 expression were measured in hippocampus, cortex, and subcortical regions.
- Correlational analyses examined relationships between protease activity, EGR-1, and brain regions, with sex differences analyzed.
Main Results
- CIH altered calpain and caspase-3 activity in specific brain regions, with sex-dependent effects.
- Cleavage products of calpain and caspase-3 showed region- and sex-specific changes.
- EGR-1 expression decreased in the raphe nucleus in both sexes.
- Correlations indicated CIH induced sex-specific changes in neuronal connectivity.
Conclusions
- CIH dysregulates protease activity and neuronal function in a sex- and brain region-specific manner.
- Males and females exhibit distinct vulnerabilities to CIH-induced neurological changes.
- These findings support previous behavioral studies showing memory impairment in CIH-exposed rats.
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