A new functional role for mechanistic/mammalian target of rapamycin complex 1 (mTORC1) in the circadian regulation of L-type voltage-gated calcium channels in avian cone photoreceptors

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Title:	A new functional role for mechanistic/mammalian target of rapamycin complex 1 (mTORC1) in the circadian regulation of L-type voltage-gated calcium channels in avian cone photoreceptors
Authors:	黃佳瑜;Huang, Cathy Chia-Yu;Ko, Michael Lee;Ko, Gladys Yi-Ping
Contributors:	生醫理工學院生命科學系
Keywords:	1-Phosphatidylinositol 3-kinase;AKT protein;Animals;Calcium;Calcium channels;Calcium channels (L-type);Calcium channels (voltage-gated);Calcium Channels, L-Type - metabolism;Cell Membrane - metabolism;Chickens - metabolism;Circadian Rhythm;Circadian rhythms;Current density;Cytosol;Downstream;Ion Channel Gating;Ion channels;Kinases;Mammals;Mechanistic Target of Rapamycin Complex 1;Models, Biological;Modulation;Multiprotein Complexes - antagonists & inhibitors;Multiprotein Complexes - metabolism;Neurotransmitter release;Night;Phosphatidylinositol 3-Kinases - metabolism;Photoreception;Photoreceptors;Protein kinases;Protein transport;Proteins;Proto-Oncogene Proteins c-akt - metabolism;Rapamycin;Retina;Retinal Cone Photoreceptor Cells - physiology;Signal Transduction;Signaling;TOR protein;TOR Serine-Threonine Kinases - antagonists & inhibitors;TOR Serine-Threonine Kinases - metabolism;Translocation;Veterinary colleges
Date:	2013-08-19
Issue Date:	2026-04-23 11:11:23 (UTC+8)
Publisher:	Public Library of Science;United States: Public Library of Science
Abstract:	摘要： In the retina, the L-type voltage-gated calcium channels (L-VGCCs) are responsible for neurotransmitter release from photoreceptors and are under circadian regulation. Both the current densities and protein expression of L-VGCCs are significantly higher at night than during the day. However, the underlying mechanisms of circadian regulation of L-VGCCs in the retina are not completely understood. In this study, we demonstrated that the mechanistic/mammalian target of rapamycin complex (mTORC) signaling pathway participated in the circadian phase-dependent modulation of L-VGCCs. The activities of the mTOR cascade, from mTORC1 to its downstream targets, displayed circadian oscillations throughout the course of a day. Disruption of mTORC1 signaling dampened the L-VGCC current densities, as well as the protein expression of L-VGCCs at night. The decrease of L-VGCCs at night by mTORC1 inhibition was in part due to a reduction of L-VGCCα1 subunit translocation from the cytosol to the plasma membrane. Finally, we showed that mTORC1 was downstream of the phosphatidylionositol 3 kinase-protein kinase B (PI3K-AKT) signaling pathway. Taken together, mTORC1 signaling played a role in the circadian regulation of L-VGCCs, in part through regulation of ion channel trafficking and translocation, which brings to light a new functional role for mTORC1: the modulation of ion channel activities. 其他題名： PLoS One 出版者： United States: Public Library of Science 出版日期： 2013-08-19 出處： PloS one, 2013-08, Vol.8 (8), p.e73315 資源來源： Agricultural & Environmental Science Collection 版權： COPYRIGHT 2013 Public Library of Science 版權： 2013 Huang et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License: https://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 版權： 2013 Huang et al 2013 Huang et al 識別號： ISSN: 1932-6203 識別號： EISSN: 1932-6203 識別號： DOI: 10.1371/journal.pone.0073315 識別號： PMID: 23977383
Appears in Collections:	[Department of Life Science] journal & Dissertation

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