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GABA in the suprachiasmatic nucleus refines circadian output rhythms in mice

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Title: GABA in the suprachiasmatic nucleus refines circadian output rhythms in mice
Authors: Ono, Daisuke Browse this author →KAKEN DB
Honma, Ken-ichi Browse this author →KAKEN DB
Yanagawa, Yuchio Browse this author →KAKEN DB
Yamanaka, Akihiro Browse this author →KAKEN DB
Honma, Sato Browse this author →KAKEN DB
Issue Date: 21-Jun-2019
Publisher: Nature Publishing Group
Journal Title: Communications biology
Volume: 2
Start Page: 232
Publisher DOI: 10.1038/s42003-019-0483-6
PMID: 31263776
Abstract: In mammals, the circadian rhythms are regulated by the central clock located in the hypothalamic suprachiasmatic nucleus (SCN), which is composed of heterogeneous neurons with various neurotransmitters. Among them an inhibitory neurotransmitter, gamma-Amino-Butyric-Acid (GABA), is expressed in almost all SCN neurons, however, its role in the circadian physiology is still unclear. Here, we show that the SCN of fetal mice lacking vesicular GABA transporter (VGAT(-/-)) or GABA synthesizing enzyme, glutamate decarboxylase (GAD65(-/-)/67(-/-)), shows burst firings associated with large Ca2+ spikes throughout 24 hours, which spread over the entire SCN slice in synchrony. By contrast, circadian PER2 rhythms in VGAT(-/-) and GAD65(-/-)/67(-/-) SCN remain intact. SCN-specific VGAT deletion in adult mice dampens circadian behavior rhythm. These findings indicate that GABA in the fetal SCN is necessary for refinement of the circadian firing rhythm and, possibly, for stabilizing the output signals, but not for circadian integration of multiple cellular oscillations.
Type: article
Appears in Collections:脳科学研究教育センター (Research and Education Center for Brain Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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