کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9425708 | 1614909 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Modafinil more effectively induces wakefulness in orexin-null mice than in wild-type littermates
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کلمات کلیدی
Fos-immunoreactiveREMFFTDATPBSAmphetamine - آمفتامین هاElectroencephalogram - الکتروانسفالوگرافیEMG - الکترومیوگرافیelectromyogram - الکترومیوگرافیDopamine transporter - انتقال دهنده دوپامینarousal - انگیختگیFast Fourier transform - تبدیل سریع فوریهrapid eye movement - حرکت سریع چشمSleep attacks - حملات خوابDopamine - دوپامینFos-ir - فوزیStimulants - محرک ها یا انگیزنده هاPhosphate-buffered saline - محلول نمک فسفات با خاصیت بافریEEG - نوار مغزی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Narcolepsy-cataplexy, a disorder of excessive sleepiness and abnormalities of rapid eye movement (REM) sleep, results from deficiency of the hypothalamic orexin (hypocretin) neuropeptides. Modafinil, an atypical wakefulness-promoting agent with an unknown mechanism of action, is used to treat hypersomnolence in these patients. Fos protein immunohistochemistry has previously demonstrated that orexin neurons are activated after modafinil administration, and it has been hypothesized that the wakefulness-promoting properties of modafinil might therefore be mediated by the neuropeptide. Here we tested this hypothesis by immunohistochemical, electroencephalographic, and behavioral methods using modafinil at doses of 0, 10, 30 and 100 mg/kg i.p. in orexinâ/â mice and their wild-type littermates. We found that modafinil produced similar patterns of neuronal activation, as indicated by Fos immunohistochemistry, in both genotypes. Surprisingly, modafinil more effectively increased wakefulness time in orexinâ/â mice than in the wild-type mice. This may reflect compensatory facilitation of components of central arousal in the absence of orexin in the null mice. In contrast, the compound did not suppress direct transitions from wakefulness to REM sleep, a sign of narcolepsy-cataplexy in mice. Spectral analysis of the electroencephalogram in awake orexinâ/â mice under baseline conditions revealed reduced power in the θ band frequencies (8-9 Hz), an index of alertness or attention during wakefulness in the rodent. Modafinil administration only partly compensated for this attention deficit in the orexin null mice. We conclude that the presence of orexin is not required for the wakefulness-prolonging action of modafinil, but orexin may mediate some of the alerting effects of the compound.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 130, Issue 4, 2005, Pages 983-995
Journal: Neuroscience - Volume 130, Issue 4, 2005, Pages 983-995
نویسندگان
J.T. Willie, W. Renthal, R.M. Chemelli, M.S. Miller, T.E. Scammell, M. Yanagisawa, C.M. Sinton,