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GABAergic neurons in the rostromedial tegmental nucleus are essential for rapid eye movement sleep suppression
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GABAergic neurons in the rostromedial tegmental nucleus are essential for rapid eye movement sleep suppression
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Journal Article
GABAergic neurons in the rostromedial tegmental nucleus are essential for rapid eye movement sleep suppression
2022
Overview
Rapid eye movement (REM) sleep disturbances are prevalent in various psychiatric disorders. However, the neural circuits that regulate REM sleep remain poorly understood. Here, we found that in male mice, optogenetic activation of rostromedial tegmental nucleus (RMTg) GABAergic neurons immediately converted REM sleep to arousal and then initiated non-REM (NREM) sleep. Conversely, laser-mediated inactivation completely converted NREM to REM sleep and prolonged REM sleep duration. The activity of RMTg GABAergic neurons increased to a high discharge level at the termination of REM sleep. RMTg GABAergic neurons directly converted REM sleep to wakefulness and NREM sleep via inhibitory projections to the laterodorsal tegmentum (LDT) and lateral hypothalamus (LH), respectively. Furthermore, LDT glutamatergic neurons were responsible for the REM sleep-wake transitions following photostimulation of the RMTg
GABA
-LDT circuit. Thus, RMTg GABAergic neurons are essential for suppressing the induction and maintenance of REM sleep.
The neural circuits regulating REM sleep are poorly understood. The authors reveal that GABAergic neurons in the rostromedial tegmental nucleus suppress the onset and maintenance of REM sleep, and that projections of these neurons to the LDT and LH mediate distinct REM sleep transitions.
