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Electrophysiological and pharmacological properties of GABAergic cells in the dorsal raphe nucleus |
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| Authors: | Yoshihiro Gocho Atsushi Sakai Yuchio Yanagawa Hidenori Suzuki Fumihito Saitow |
| Institution: | 1. Department of Pharmacology, Nippon Medical School, Tokyo, 113-8602, Japan 2. Department of Pediatrics, Nippon Medical School, Tokyo, 113-8602, Japan 3. Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine and Japan Science and Technology Agency, CREST, Maebashi, 371-8511, Japan 4. Japan Science and Technology Agency, CREST, Tokyo, 102-0075, Japan |
| Abstract: | The dorsal raphe nucleus (DRN) is the origin of the central serotonin 5-hydroxytryptamine (5-HT)] system and plays an important role in the regulation of many physiological functions such as sleep/arousal, food intake and mood. In order to understand the regulatory mechanisms of 5-HT system, characterization of the types of neurons is necessary. We performed electrophysiological recordings in acute slices of glutamate decarboxylase 67–green fluorescent protein knock-in mice. We utilized this mouse to identify visually GABAergic cells. Especially, we examined postsynaptic responses mediated by 5-HT receptors between GABAergic and serotonergic cells in the DRN. Various current responses were elicited by 5-HT and 5-HT1A or 5-HT2A/2C receptor agonists in GABAergic cells. These results suggested that multiple 5-HT receptor subtypes overlap on GABAergic cells, and their combination might control 5-HT cells. Understanding the postsynaptic 5-HT feedback mechanisms may help to elucidate the 5-HT neurotransmitter system and develop novel therapeutic approaches. |
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