Abstract
It is eminently clear from numerous chapters in this volume that the orexin (hypocretin) neuropeptides are necessary for the normal expression of waking and sleep. However, it remains fundamentally unclear how the absence of signaling by these peptides results in the symptoms of narcolepsy. Which of the many neurons bearing orexin receptors are necessary to sustain normal waking and sleep, and which of the numerous orexin actions are required for these processes? Does the simple loss of orexin’s excitatory actions produce narcolepsy, or are there more subtle aspects to the loss of orexin signaling that result in plastic or trophic changes that give rise to the symptoms of narcolepsy and cataplexy?
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Acknowledgments
This study was supported by National Institutes of Health Grants HL64150 and NS27881. We would like to thank Drs. John Edwards, Iryna Gumenchuk, Masaru Ishibashi, Morten Kristensen, and Christopher Tyler along with Ms. Emily Hsu for their contributions to the experiments described in this chapter. We would also like to thank Dr. Masashi Yanagisawa and his colleagues for their contributions to this work, including engineering the knockout mouse lines.
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Leonard, C.S., Kalogiannis, M., Kohlmeier, K.A. (2011). Hypocretin/Orexin Receptor Functions in Mesopontine Systems Regulating Sleep, Arousal, and Cataplexy. In: Baumann, C., Bassetti, C., Scammell, T. (eds) Narcolepsy. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8390-9_13
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