Mitochondrial replication, transcription, and function in obstructive sleep apnea

Area of Science:

• Mitochondrial Biology
• Sleep Medicine
• Otolaryngology

Background:

• Obstructive sleep apnea (OSA) is linked to systemic inflammation and cellular dysfunction.
• Mitochondrial dynamics are increasingly recognized as critical in various pathologies.

Purpose of the Study:

• To investigate mitochondrial replication, transcription, and function in the upper airways of OSA patients.
• To evaluate the impact of uvulopalatopharyngoplasty on these mitochondrial parameters.

Main Methods:

• Assessed TFAM and PGC-1α expression via immunohistochemistry, RT-PCR, and Western blotting in uvula specimens.
• Measured mitochondrial to nuclear DNA (Mt/N) ratio in blood, EBC, and uvula using qPCR.
• Quantified plasma and EBC TFAM and PGC-1α concentrations using ELISA.

Main Results:

• OSA patients exhibited higher levels of TFAM, PGC-1α, and Mt/N ratio compared to controls.
• Successful uvulopalatopharyngoplasty correlated with decreased TFAM, PGC-1α, and EBC Mt/N ratio.
• Unresponsive patients maintained elevated levels of these mitochondrial markers.

Conclusions:

• OSA is associated with increased mitochondrial replication, transcription signaling, and dysfunction in the upper airway.
• Uvulopalatopharyngoplasty can restore mitochondrial homeostasis in OSA patients who respond to treatment.
• Mitochondrial markers serve as indicators of OSA severity and treatment efficacy.