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The role of co-neurotransmitters in sleep and wake regulation

Abstract

Sleep and wakefulness control in the mammalian brain requires the coordination of various discrete interconnected neurons. According to the most conventional sleep model, wake-promoting neurons (WPNs) and sleep-promoting neurons (SPNs) compete for network dominance, creating a systematic “switch” that results in either the sleep or awake state. WPNs and SPNs are ubiquitous in the brainstem and diencephalon, areas that together contain <1% of the neurons in the human brain. Interestingly, many of these WPNs and SPNs co-express and co-release various types of the neurotransmitters that often have opposing modulatory effects on the network. Co-transmission is often beneficial to structures with limited numbers of neurons because it provides increasing computational capability and flexibility. Moreover, co-transmission allows subcortical structures to bi-directionally control postsynaptic neurons, thus helping to orchestrate several complex physiological functions such as sleep. Here, we present an in-depth review of co-transmission in hypothalamic WPNs and SPNs and discuss its functional significance in the sleep–wake network.

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Acknowledgements

We gratefully acknowledge support from the Tau Consortium/Rainwater Charitable Foundation and NIH grants: K24AG053435 (LTG), R56MH107042 (TCN). The Grants that support JCB came from the Fundação de Amparo à Pesquisa do Estado de São Paulo [São Paulo Research Foundation - FAPESP] grant #2016/02224-1 [JCB], the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior [Agency for the Advancement of Higher Education – CAPES grant #848/15], and the Conselho Nacional de Desenvolvimento Científico e Tecnológico [National Council for Scientific and Technological Development - CNPq] with grant #426378/2016-4. JCB is an investigator with the CNPq. JYO is a Tau Consortium Fellow. We also thank Dulce Morales for histology and Evan T. Keum and Brian Hitchin for manuscript editing.

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Oh, J., Petersen, C., Walsh, C.M. et al. The role of co-neurotransmitters in sleep and wake regulation. Mol Psychiatry 24, 1284–1295 (2019). https://doi.org/10.1038/s41380-018-0291-2

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