Nitz D, Siegel J
Department of Neuroscience, University of California, Los Angeles 90024, USA.
Am J Physiol. 1997 Jul;273(1 Pt 2):R451-5. doi: 10.1152/ajpregu.1997.273.1.R451.
The cessation of firing of serotonergic dorsal raphe neurons is a key controlling event of rapid eye movement (REM) sleep. We tested the hypothesis that this cessation of activity is due to gamma-aminobutyric acid (GABA) release using the in vivo microdialysis technique. We found that REM sleep is accompanied by a selective increase in GABA release, but not by a change in glutamate or glycine release in the dorsal raphe nucleus. Microinjection of the GABA agonist muscimol into the dorsal raphe increased REM sleep, although microperfusion of the GABA antagonist picrotoxin blocked REM sleep. These results implicate GABA release as a critical element in the production of the REM sleep state and in the control of discharge in serotonergic neurons across the sleep/wake cycle.
血清素能中缝背核神经元放电的停止是快速眼动(REM)睡眠的关键控制事件。我们使用体内微透析技术检验了这一假说,即这种活动的停止是由于γ-氨基丁酸(GABA)释放所致。我们发现,REM睡眠伴随着背侧中缝核中GABA释放的选择性增加,但谷氨酸或甘氨酸释放没有变化。向背侧中缝核微量注射GABA激动剂蝇蕈醇可增加REM睡眠,而微量灌注GABA拮抗剂印防己毒素则会阻断REM睡眠。这些结果表明,GABA释放是REM睡眠状态产生以及整个睡眠/觉醒周期中血清素能神经元放电控制的关键因素。