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大学院医学系研究科(医学専攻等) 医学専攻 病態制御医学系 生体防御学講座 |
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石井 聡 (イシイ サトシ)
ISHII Satoshi
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研究キーワード 【 表示 / 非表示 】
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G-protein-coupled receptor
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Gタンパク質共役型受容体
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生理活性脂質
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Gタンパク質共役型受容体
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生理活性脂質
出身大学 【 表示 / 非表示 】
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-1990年
東京工業大学 総合理工学研究科 生命化学専攻 卒業
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-1990年
東京工業大学 Graduate School, Division of Integrated Science and Engineering 卒業
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1984年04月-1988年03月
東京工業大学 理学部 化学科 卒業
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-1988年
東京工業大学 理学部 卒業
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-1988年
東京工業大学 理学部 化学科 卒業
研究等業績 【 表示 / 非表示 】
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Janovicz A., Majer A., Kosztelnik M., Geiszt M., Chun J., Ishii S., Tigyi G.J., Benyó Z., Ruisanchez É.
Experimental Biology and Medicine ( Experimental Biology and Medicine ) 248 1887 - 1894 2023年10月 [査読有り]
研究論文(学術雑誌) 国際共著
Lysophosphatidylcholine (LPC) is a bioactive lipid that has been shown to attenuate endothelium-dependent vasorelaxation contributing to endothelial dysfunction; however, the underlying mechanisms are not well understood. In this study, we investigated the molecular mechanisms involved in the development of LPC-evoked impairment of endothelium-dependent vasorelaxation. In aortic rings isolated from wild-type (WT) mice, a 20-min exposure to LPC significantly reduced the acetylcholine chloride (ACh)–induced vasorelaxation indicating the impairment of normal endothelial function. Interestingly, pharmacological inhibition of autotaxin (ATX) by GLPG1690 partially reversed the endothelial dysfunction, suggesting that lysophosphatidic acid (LPA) derived from LPC may be involved in the effect. Therefore, the effect of LPC was also tested in aortic rings isolated from different LPA receptor knock-out (KO) mice. LPC evoked a marked reduction in ACh-dependent vasorelaxation in Lpar1, Lpar2, and Lpar4 KO, but its effect was significantly attenuated in Lpar5 KO vessels. Furthermore, addition of superoxide dismutase reduced the LPC-induced endothelial dysfunction in WT but not in the Lpar5 KO mice. In addition, LPC increased H<sub>2</sub>O<sub>2</sub> release from WT vessels, which was significantly reduced in Lpar5 KO vessels. Our findings indicate that the ATX–LPA–LPA<sub>5</sub> receptor axis is involved in the development of LPC-induced impairment of endothelium-dependent vasorelaxation via LPA<sub>5</sub> receptor–mediated reactive oxygen species production. Taken together, in this study, we identified a new pathway contributing to the development of LPC-induced endothelial dysfunction.
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Inverse agonism of lysophospholipids with cationic head groups at Gi-coupled receptor GPR82
Yasuda D., Hamano F., Masuda K., Dahlström M., Kobayashi D., Sato N., Hamakubo T., Shimizu T., Ishii S.
European Journal of Pharmacology ( European Journal of Pharmacology ) 954 175893 2023年09月 [査読有り]
研究論文(学術雑誌) 国際共著
GPR82 is an orphan G protein-coupled receptor (GPCR) that has been implicated in lipid storage in mouse adipocytes. However, the intracellular signaling as well as the specific ligands of GPR82 remain unknown. GPR82 is closely related to GPR34, a GPCR for the bioactive lipid molecule lysophosphatidylserine. In this study, we screened a lipid library using GPR82-transfected cells to search for ligands that act on GPR82. By measuring cyclic adenosine monophosphate levels, we found that GPR82 is an apparently constitutively active GPCR that leads to Gi protein activation. In addition, edelfosine (1-O-octadecyl-2-O-methyl-sn-glycero-3-phosphocholine), an artificial lysophospholipid with a cationic head group that exerts antitumor activity, inhibited the Gi protein activation by GPR82. Two endogenous lysophospholipids with cationic head groups, lysophosphatidylcholine (1-oleoyl-sn-glycero-3-phosphocholine) and lysophosphatidylethanolamine (1-oleoyl-sn-glycero-3-phosphoethanolamine), also exhibited GPR82 inhibitory activity, albeit weaker than edelfosine. Förster resonance energy transfer imaging analysis consistently demonstrated that Gi protein-coupled GPR82 has an apparent constitutive activity that is edelfosine-sensitive. Consistent data were obtained from GPR82-mediated binding analysis of guanosine-5'-O-(3-thiotriphosphate) to cell membranes. Furthermore, in GPR82-transfected cells, edelfosine inhibited insulin-induced extracellular signal-regulated kinase activation, like compounds that function as inverse agonists at other GPCRs. Therefore, edelfosine is likely to act as an inverse agonist of GPR82. Finally, GPR82 expression inhibited adipocyte lipolysis, which was abrogated by edelfosine. Our findings suggested that the cationic lysophospholipids edelfosine, lysophosphatidylcholine and lysophosphatidylethanolamine are novel inverse agonists for Gi-coupled GPR82, which is apparently constitutively active, and has the potential to exert lipolytic effects through GPR82.
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Spencer S.A., Suárez-Pozos E., Verdugo J.S., Wang H., Afshari F.S., Guo L., Manam S., Yasuda D., Ortega A., Lister J.A., Ishii S., Zhang Y., Fuss B.
Journal of Neurochemistry 163 ( 6 ) 478 - 499 2023年02月 [査読有り]
研究論文(学術雑誌) 国際共著
The developmental process of central nervous system (CNS) myelin sheath formation is characterized by well-coordinated cellular activities ultimately ensuring rapid and synchronized neural communication. During this process, myelinating CNS cells, namely oligodendrocytes (OLGs), undergo distinct steps of differentiation, whereby the progression of earlier maturation stages of OLGs represents a critical step toward the timely establishment of myelinated axonal circuits. Given the complexity of functional integration, it is not surprising that OLG maturation is controlled by a yet fully to be defined set of both negative and positive modulators. In this context, we provide here first evidence for a role of lysophosphatidic acid (LPA) signaling via the G protein-coupled receptor LPA6 as a negative modulatory regulator of myelination-associated gene expression in OLGs. More specifically, cell surface accessibility of LPA6 was found to be restricted to the earlier maturation stages of differentiating OLGs, and OLG maturation was found to occur precociously in Lpar6 knockout mice. To further substantiate these findings, a novel small molecule ligand with selectivity for preferentially LPA6 and LPA6 agonist characteristics was functionally characterized in vitro in primary cultures of rat OLGs and in vivo in the developing zebrafish. Utilizing this approach, a negative modulatory role of LPA6 signaling in OLG maturation could be corroborated. During development, such a functional role of LPA6 signaling likely serves to ensure timely coordination of circuit formation and myelination. Under pathological conditions as seen in the major human demyelinating disease multiple sclerosis (MS), however, persistent LPA6 expression and signaling in OLGs can be seen as an inhibitor of myelin repair. Thus, it is of interest that LPA6 protein levels appear elevated in MS brain samples, thereby suggesting that LPA6 signaling may represent a potential new druggable pathway suitable to promote myelin repair in MS.
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Yanagida, K., Masago, K., Yasuda, D., Hamano, F., Kurikawa, Y., Shimizu, T. ,Ishii, S.
Human Molecular Genetics 32 ( 5 ) 825 - 834 2022年09月 [査読有り]
研究論文(学術雑誌) 国内共著
In human autosomal recessive woolly hair/hypotrichosis (ARWH/HT), many mutations have been identified in a gene encoding LPA6, a G protein-coupled receptor (GPCR) for lysophosphatidic acid (LPA). However, information regarding the effects of such mutations on receptor function is limited. In this study, we examined functional impacts of selected amino acid changes in LPA6 identified in ARWH/HT patients. In our exogenous expression experiments, all mutants except S3T failed to respond to LPA, indicating that they are loss-of-function mutants. Among the nine mutants, five (D63V, G146R, N246D, L277P, and C278Y) displayed impaired expression at the cell surface due to endoplasmic reticulum (ER) retention, indicating that these mutants are trafficking-defective, as reported in other disease-associated GPCRs. Notably, alkyl-OMPT, a potent synthetic agonist for LPA6 restored the defective cell surface expression of two of the ER-retained mutants, D63V and N246D, possibly by its chaperoning function that allows them to escape intracellular retention as well as proteasomal degradation. Furthermore, the alkyl-OMPT-rescued N246D mutant was shown be functional. Our findings encourage future application of pharmacoperone therapy for ARWH/HT patients with specific LPA6 mutations.
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Yasuda, D., Kobayashi, D., Akahoshi, N., Ohto-Nakanishi, T., Yoshioka, K., Takuwa, Y., Mizuno, S., Takahashi, S., and Ishii, S.
Journal of Clinical Investigation 129 ( 10 ) 4332 - 4349 2019年10月 [査読有り]
研究論文(学術雑誌) 国内共著
Lysophosphatidic acid (LPA) is a potent lipid mediator with various biological functions mediated through six G protein-coupled receptors (GPCRs), LPA1-6. Previous studies have demonstrated that LPA-Gα12/Gα13 signaling plays an important role in embryonic vascular development. However, the responsible LPA receptors and underlying mechanisms are poorly understood. Here, we show a critical role of LPA4 and LPA6 in developmental angiogenesis. In mice, Lpa4;Lpa6 double knockout (DKO) embryos were lethal due to global vascular deficiencies, and endothelial cell (EC)-specific Lpa4;Lpa6 DKO retinas had impaired sprouting angiogenesis. Mechanistically, LPA activated the transcriptional regulators YAP and TAZ through LPA4/LPA6-mediated Gα12/Gα13-Rho-ROCK signaling in ECs. YAP/TAZ knockdown increased β-catenin- and Notch intracellular domain (NICD)-mediated endothelial expression of the Notch ligand delta-like 4 (DLL4). Fibrin gel sprouting assay revealed that LPA4/LPA6, Gα12/Gα13, or YAP/TAZ knockdown consistently blocked EC sprouting, which was rescued by a Notch inhibitor. Of note, the inhibition of Notch signaling also ameliorated impaired retinal angiogenesis in EC-specific Lpa4;Lpa6 DKO mice. Overall, these results suggest that the Gα12/Gα13-coupled receptors LPA4 and LPA6 synergistically regulate endothelial Dll4 expression through YAP/TAZ activation. This could in part account for the mechanism of YAP/TAZ-mediated developmental angiogenesis. Our findings provide a novel insight into the biology of GPCR-activated YAP/TAZ.
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脂肪酸摂取と呼吸器疾患
石井聡
呼吸と循環 ( 医学書院 ) 59 ( 8 ) 773 - 781 2011年08月
総説・解説(商業誌) 単著
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Gタンパク質共役型受容体を介した生体機能調節
石井聡
秋田医学 ( 秋田医学会 ) 37 ( 3-4 ) 109 - 122 2011年03月
総説・解説(その他) 単著
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酸性条件化でのがん細胞増殖メカニズム
石井聡
Medical Bio ( オーム社 ) 8 ( 1 ) 48 - 51 2011年01月
総説・解説(商業誌) 単著
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ロイコトリエンの多様な疾患へのかかわり─受容体改変マウスの解析から
安田大恭,石井聡
実験医学 ( 羊土社 ) 28 ( 20 ) 3378 - 3385 2010年12月
総説・解説(商業誌) 国内共著
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リゾホスファチジン酸受容体研究Update
柳田圭介, 石井聡
医学のあゆみ ( 医歯薬出版 ) 233 ( 9 ) 807 - 811 2010年05月
総説・解説(商業誌) 国内共著
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アレルギー疾患における血小板活性化因子(PAF)
石井 聡
皮膚アレルギーフロンティア 19 81 - 85 2021年11月 [招待有り]
研究論文(その他学術会議資料等) 単著
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LPA5受容体を介した抗炎症性サイトカインIL-10の産生機構の解析
可野 邦行, 王 嬌, 石井 聡, 青木 淳賢
脂質生化学研究 ( 日本脂質生化学会 ) 61 154 - 155 2019年06月
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Non-EDG型LPA受容体
石井 聡, 柳田 圭介
生化学 ( 公益社団法人日本生化学会 ) 90 ( 5 ) 596 - 608 2018年10月
リゾホスファチジン酸(LPA)は多彩な生理作用を発揮する脂質メディエーターである.LPAの作用は,endothelial differentiation gene(EDG)型受容体ファミリーに属する3種類のGタンパク質共役型受容体LPA1~LPA3によって媒介されると当初は考えられていた.しかし,筆者らによる第四のLPA受容体(LPA4)の発見が契機となって,一次配列相同性の高い2種類のLPA受容体(LPA5およびLPA6)が次々と同定された.EDG型LPA受容体とは相同性の低いLPA4~LPA6は,新規LPA受容体ファミリー(Non-EDG型LPA受容体ファミリー)を構成する.各Non-EDG型LPA受容体について,生化学的な性状解析が精力的に進められてきており,LPA6では立体構造も最近解明された.また,ノックアウトマウスの解析を中心として各受容体特有の生理機能も徐々に明らかになっている.
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LPA5型受容体活性化はマウス腹腔マクロファージにおいてIL-10産生を亢進させる(Activation of LPA5 receptor enhances IL-10 production in murine peritoneal macrophage)
王 嬌, 可野 邦行, 丸山 貴司, 石井 聡, 青木 淳賢
日本生化学会大会プログラム・講演要旨集 ( (公社)日本生化学会 ) 91回 [2T11a - 04(2P 2018年09月
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LPAによる昇圧作用メカニズムの解析
可野 邦行, 松本 宏隆, 井上 飛鳥, 雪浦 弘志, Chun Jerold, 石井 聡, 清水 孝雄, 青木 淳賢
脂質生化学研究 ( 日本脂質生化学会 ) 60 209 - 210 2018年05月
リゾホスファチジン酸(LPA)は、LPA特異的な6種類のGPCR(LPA1-LPA6)を介して様々な生理機能に関与する脂質メディエーターである。元来、LPAはvasoactive lipidとして同定され、その薬理作用として昇圧作用がよく知られているが、そのメカニズムと生理的意義に関しては全くの不明であった。そこで本研究では、このLPAによる血圧上昇作用の分子機構を明らかにすることを目的とした。まずLPAが豊富に含まれる加温血漿をマウスに投与したところ、一過性の昇圧作用が認められた。この反応は、血中のLPA産生酵素であるオートタキシン(ATX)の阻害剤添加時には全く認められなかった。LPAによる昇圧反応はROCK阻害剤であるY-27632前投与によって有意に抑制され、さらにLPA4 KOマウスにおいてもLPAの昇圧作用が減弱することを見出した。一方、LPA6 KOマウスにおいてもLPAの反応性は低下していたが、このマウスは様々な血管作動薬に対する昇圧反応にも障害が認められ、さらに血管形成にも異常を生じていることがわかった。そこで様々なLPAの構造類似体を用いた評価を行ったところ、LPA4に対するアゴニスト活性と昇圧作用の強さがよい相関性を示すことが明らかとなった。以上の結果から、血中でATX依存的に産生されたLPAは主にGα12/13に共役するLPA4受容体を介して昇圧反応を誘導することが強く示唆された。(著者抄録)
◆原著論文【 表示 / 非表示 】
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秋田医学叢書No.5 秋田から世界へ発信する最先端医学研究 ー秋田大学医学部創立40周年記念
本橋豊,茆原順一(編) 清水孝雄,寺島俊雄,安川正貴,石井聡,美作宗太郎,石川和夫,吉冨健志,羽渕友則 ( 担当: 共著 )
秋田新報社 2011年10月 ISBN: 978-4-87020-315-0
科研費(文科省・学振)獲得実績 【 表示 / 非表示 】
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脂肪細胞でPPARγ活性を制御する生理活性脂質受容体のG12/13依存性シグナル
基盤研究(B)
研究期間: 2019年04月 - 2022年03月 代表者: 石井聡