Abnormal Mitochondria Organization and Oxidative Activity in the Palate Muscles of Long-Term Snorers with Obstructive Sleep Apnea
2012 (English)In: Respiration, ISSN 0025-7931, E-ISSN 1423-0356, Vol. 83, no 5, 407-417 p.Article in journal (Refereed) Published
Background: Histopathological alterations and a reduced number of capillaries have been observed in the palate muscles of snorers with obstructive sleep apnea syndrome (OSAS). These changes may create a substrate for decreased microcirculation, impaired aerobic metabolism and muscle dysfunction and contribute to upper airway obstruction during sleep. Objectives: The aim was to analyze mitochondria distribution and oxidative enzyme activity in relation to capillary supply in the palate muscles of patients with a history of long-term snoring and OSAS. Methods: Palatopharyngeus (PP) and uvula (UV) muscle samples were obtained from 8 patients undergoing uvulopalatopharyngoplasty due to habitual snoring and OSAS. The muscles were analyzed with enzyme- and immunohistochemistry and morphometry. Results: Abnormalities in the internal organization of mitochondria and oxidative activity were observed in 39 ± 15% of the fibers in the PP and 4 ± 3% in the UV, but not in control samples. The majority of these fibers had a lobulated contour and trabecular internal organization of mitochondria. The number of capillaries around abnormal fibers (PP 0.9 ± 0.3, UV 0.4 ± 0.1) was lower than in fibers of a normal appearance in both patients (PP 1.4 ± 0.6, UV 1.2 ± 0.3) and references (PP 2.7 ± 0.7, UV 1.9 ± 0.9) (p < 0.05). Conclusions: Abnormal mitochondrial distribution, a low capillary supply and signs of impaired oxidative activity suggest that muscle dysfunction of the palate muscles in long-term snorers may contribute to the upper airway obstruction during sleep. The cause of these abnormalities remains unclear, but local muscle and nerve trauma due to vibration and stretch is a possible etiology.
Place, publisher, year, edition, pages
S. Karger, 2012. Vol. 83, no 5, 407-417 p.
Palate muscle, Mitochondria, Capillaries, Snoring, Sleep apnea, Obstructive sleep apnea syndrome
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:umu:diva-53901DOI: 10.1159/000336040PubMedID: 22378021OAI: oai:DiVA.org:umu-53901DiVA: diva2:514011