|Publication Type||Journal Article|
|Year of Publication||2014|
|Authors||Han, Y, Shi, Y-feng, Xi, W, Zhou, R, Tan, Z-bing, Wang, H, Li, X-ming, Chen, Z, Feng, G, Luo, M, Huang, Z-li, Duan, S, Yu, Y-qin|
|Date Published||2014 Mar 17|
|Keywords||Action Potentials, Animals, Cholinergic Neurons, Electroencephalography, Electromyography, Mice, Transgenic, Photic Stimulation, Prosencephalon, Rhodopsin, Sleep, Sleep, REM, Wakefulness|
The basal forebrain (BF) plays a crucial role in cortical activation [1, 2]. However, the exact role of cholinergic BF (ch-BF) neurons in the sleep-wake cycle remains unclear [3, 4]. We demonstrated that photostimulation of ch-BF neurons genetically targeted with channelrhodopsin 2 (ChR2) was sufficient to induce an immediate transition to waking or rapid eye movement (REM) sleep from slow-wave sleep (SWS). Light stimulation was most likely to induce behavioral arousal during SWS, but not during REM sleep, a result in contrast to the previously reported photostimulation of noradrenergic or hypocretin neurons that induces wake transitions from both SWS and REM sleep. Furthermore, the ratio of light-induced transitions from SWS to wakefulness or to REM sleep did not significantly differ from that of natural transitions, suggesting that activation of ch-BF neurons facilitates the transition from SWS but does not change the direction of the transition. Excitation of ch-BF neurons during wakefulness or REM sleep sustained the cortical activation. Stimulation of these neurons for 1 hr induced a delayed increase in the duration of wakefulness in the subsequent inactive period. Our results suggest that activation of ch-BF neurons alone is sufficient to suppress SWS and promote wakefulness and REM sleep.
|Alternate Journal||Curr. Biol.|