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KMID : 0620920180500110145
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Experimental & Molecular Medicine
2018 Volume.50 No. 11 p.145 ~ p.145
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TWIK-1/TASK-3 heterodimeric channels contribute to the neurotensin-mediated excitation of hippocampal dentate gyrus granule cells
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Choi Jae-Hyouk
Yarishkin Oleg
Kim Eun-Ju
Bae Yeon-Ju
Kim A-Jung
Kim Seung-Chan
Ryoo Kang-Hyun
Cho Chang-Hoon
Hwang Eun-Mi
Park Jae-Yong
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Abstract
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Two-pore domain K+ (K2P) channels have been shown to modulate neuronal excitability. The physiological role of TWIK-1, the first identified K2P channel, in neuronal cells is largely unknown, and we reported previously that TWIK-1 contributes to the intrinsic excitability of dentate gyrus granule cells (DGGCs) in mice. In the present study, we investigated the coexpression of TWIK-1 and TASK-3, another K2P member, in DGGCs. Immunohistochemical staining data showed that TASK-3 proteins were highly localized in the proximal dendrites and soma of DGGCs, and this localization is similar to the expression pattern of TWIK-1. TWIK-1 was shown to associate with TASK-3 in DGGCs of mouse hippocampus and when both genes were overexpressed in COS-7 cells. shRNA-mediated gene silencing demonstrated that TWIK-1/TASK-3 heterodimeric channels displayed outwardly rectifying currents and contributed to the intrinsic excitability of DGGCs. Neurotensin?neurotensin receptor 1 (NT?NTSR1) signaling triggered the depolarization of DGGCs by inhibiting TWIK-1/TASK-3 heterodimeric channels, causing facilitated excitation of DGGCs. Taken together, our study clearly showed that TWIK-1/TASK-3 heterodimeric channels contribute to the intrinsic excitability of DGGCs and that their activities are regulated by NT?NTSR1 signaling.
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KEYWORD
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Ion channels in the nervous system, Molecular neuroscience
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