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Title: GPR40 activation initiates store-operated Ca²⁺ entry and potentiates insulin secretion via the IP3R1/STIM1/Orai1 pathway in pancreatic β-cells
Authors: Usui, Ryota  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-4641-0158 (unconfirmed)
Yabe, Daisuke
Fauzi, Muhammad
Goto, Hisanori
Botagarova, Ainur
Tokumoto, Shinsuke
Tatsuoka, Hisato  kyouindb  KAKEN_id
Tahara, Yumiko
Kobayashi, Shizuka
Manabe, Toshiya
Baba, Yoshihiro
Kurosaki, Tomohiro
Herrera, Pedro Luis
Ogura, Masahito  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7107-2752 (unconfirmed)
Nagashima, Kazuaki
Inagaki, Nobuya  kyouindb  KAKEN_id
Author's alias: 臼井, 亮太
矢部, 大介
後藤, 久典
龍岡, 久登
小倉, 雅仁
長嶋, 一昭
稲垣, 暢也
Issue Date: 29-Oct-2019
Publisher: Springer Science and Business Media LLC
Journal title: Scientific reports
Volume: 9
Issue: 1
Thesis number: 15562
Abstract: The long-chain fatty acid receptor GPR40 plays an important role in potentiation of glucose-induced insulin secretion (GIIS) from pancreatic β-cells. Previous studies demonstrated that GPR40 activation enhances Ca²⁺ release from the endoplasmic reticulum (ER) by activating inositol 1, 4, 5-triphosphate (IP3) receptors. However, it remains unknown how ER Ca²⁺ release via the IP3 receptor is linked to GIIS potentiation. Recently, stromal interaction molecule (STIM) 1 was identified as a key regulator of store-operated Ca²⁺ entry (SOCE), but little is known about its contribution in GPR40 signaling. We show that GPR40-mediated potentiation of GIIS is abolished by knockdown of IP3 receptor 1 (IP3R1), STIM1 or Ca²⁺-channel Orai1 in insulin-secreting MIN6 cells. STIM1 and Orai1 knockdown significantly impaired SOCE and the increase of intracellular Ca²⁺ by the GPR40 agonist, fasiglifam. Furthermore, β-cell-specific STIM1 knockout mice showed impaired fasiglifam-mediated GIIS potentiation not only in isolated islets but also in vivo. These results indicate that the IP3R1/STIM1/Orai1 pathway plays an important role in GPR40-mediated SOCE initiation and GIIS potentiation in pancreatic β-cells.
Rights: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/246210
DOI(Published Version): 10.1038/s41598-019-52048-1
PubMed ID: 31664108
Appears in Collections:Journal Articles

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