Abstract
Orexin-containing cells are located in the posterior lateral hypothalamus and send axonal projections to all brain and spinal cord locations important for the control of sleep-wake states, breathing, blood pressure, heart rate and motor activity, as well as mood, attention and motivation. While their strategic location and widespread efferent connections suggest that orexin neurons have major and multifaceted roles, elimination of orexins or their receptors results in a relatively discrete and focused deficiency—narcolepsy/cataplexy. Orexin-deficient rodents have been relatively extensively used to assess the role of endogenous orexins in cardiorespiratory regulation. Orexin receptor antagonists have been developed with a delay after the discovery of orexins and their use for focal probing of the endogenous role of orexins in different brain regions has been limited. Despite intense research, it is still unclear under which conditions orexins are physiologically important for the many different roles ascribed to them based on their anatomical connectivity and effects of focal administration of synthetic orexins. Here, we review recent studies which aimed to elucidate the endogenous role of orexins in the control of breathing and blood pressure under different physiologic and pathophysiologic conditions.
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Acknowledgments
Our studies summarized in this review were supported by the following grants from the National Institutes of Health: HL-47600, HL-60287, HL-74385 and HL-116508.
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Kubin, L. (2015). Orexinergic Tone in Cardiorespiratory Regulation. In: Sakurai, T., Pandi-Perumal, S., Monti, J. (eds) Orexin and Sleep. Springer, Cham. https://doi.org/10.1007/978-3-319-23078-8_22
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DOI: https://doi.org/10.1007/978-3-319-23078-8_22
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