Dexamethasone induces alterations of slow wave oscillation, rapid eye movement sleep and high‑voltage spindle in rats

• Autorzy: Issuriya A. , Kumarnsit E. , Reakkamnuan C. , Samerphob N. , Sathirapanya P. , Cheaha D.
• Języki publikacji: EN

Abstrakty

EN

Glucocorticoids arising from chronic stress and long‑term inflammatory treatment with corticosteroids are both associated with neuropathology and cognitive impairments. Many previous studies have focused on changes in brain morphology and deficits in learning behavior. However, effects of long‑term exposure to stress hormones on electrical brain signaling and sleep‑wake patterns have remained largely unexplored. This study aimed to monitor electroencephalographic (EEG) patterns induced by prolonged dexamethasone exposure. Adult male Wistar rats implanted with electrodes on the skull over the frontal and parietal cortices were intraperitoneally injected with either saline or dexamethasone (0.5 mg/kg) once daily for 21 consecutive days. Longitudinal EEG recording was performed on day 6, 11, 16 and 21. Fast Fourier transform was used for frequency power analysis. One‑way ANOVA revealed significant increases in parietal EEG power of slow frequencies (delta, theta and alpha) particularly, with the dominant theta activity seen as early as day 11 of dexamethasone treatment. Sleep‑wake analysis on day 21 confirmed a significant reduction of rapid‑eye movement (REM) sleep and increased slow frequency oscillations mainly in the parietal cortex during the awake period. The number of high‑voltage spindles (HVSs) (6‑10 Hz EEG oscillation) was significantly increased during awake and slow wave sleep (SWS) periods following dexamethasone treatment. These findings demonstrated that distinct frequency oscillations, sleep‑wakefulness and sleep spindles may be parameters of neuropathology produced by long‑term dexamethasone exposure. Early detection of these parameters might be predictive of neuropathology in long‑term corticosteroid users.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2019
• Tom: 79
• Numer: 3
• Opis fizyczny: p.251-260,fig.,ref.

Twórcy

autor

Issuriya A.

• Department of Physiology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
• Research Unit for EEG Biomarkers of Neuronal Diseases, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

autor

Kumarnsit E.

• Department of Physiology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
• Research Unit for EEG Biomarkers of Neuronal Diseases, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

autor

Reakkamnuan C.

• Department of Physiology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

autor

Samerphob N.

• Department of Physiology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
• Research Unit for EEG Biomarkers of Neuronal Diseases, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

autor

Sathirapanya P.

• Division of Neurology, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
• Research Unit for EEG Biomarkers of Neuronal Diseases, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

autor

Cheaha D.

• Department of Biology, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
• Research Unit for EEG Biomarkers of Neuronal Diseases, Faculty of Science, Prince of Songkla University, Songkhla, Thailand

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Identyfikatory

DOI

10.21307/ane‑2019‑023