JP2021107358A - グレリン受容体の活性化剤 - Google Patents
グレリン受容体の活性化剤 Download PDFInfo
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- JP2021107358A JP2021107358A JP2019239495A JP2019239495A JP2021107358A JP 2021107358 A JP2021107358 A JP 2021107358A JP 2019239495 A JP2019239495 A JP 2019239495A JP 2019239495 A JP2019239495 A JP 2019239495A JP 2021107358 A JP2021107358 A JP 2021107358A
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- ghrelin
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- ghrelin receptor
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Abstract
Description
以下の各試験において、すべてのデータは、平均値±標準偏差で示した。データのグラフ化および統計解析は、GraphPad Prism6を用いて作成した。統計解析は、one-way ANOVA(one-way analysis of variance;一元配置分散分析)を行い、Tukey’s testを用いて多重比較試験を行った。また、p<0.05を有意な差とした。
CellKey(商標) System を用いてグレリン受容体(GHS-R)活性を評価した。CellKey専用96-well plateに、GHS-Rを発現させたHEK293A細胞を播種した(4×104 cells/well)。この細胞に各試験試薬を添加した後、25分間の電気抵抗変化(ΔZ)を検出することにより、GHS-R活性を評価した。試験試薬には、100nMグレリン(Ghrelin;Peptide Institute Inc.)および100μMの化合物(1)(#7;北里大学薬学部生命薬化学研究室にて合成・供与)を用いた。また、ネガティブコントロールとしてassay buffer(vehicle)を用いた。データは、試薬添加後の最大値から試薬添加前の最小値を差し引いた値を定量化することにより評価した。
化合物(1)の酸化物である、下記式(2)で表される化合物(#7';北里大学薬学部生命薬化学研究室にて合成・供与)について、試験1と同様にグレリン受容体活性化作用を評価した。試験には、100μMの化合物#7'を用いた。具体的には、DMSOに溶解した#7'(100mM)溶液をassay bufferにて100μMに溶解し調整した。CellKey 専用96-well plate に播種した細胞 (4×104 cells/well) にvehicleならびに100μMの化合物#7'を添加し、ΔZを検出した。
その結果、図4に示すように、化合物#7'を添加した場合には、vehicleと比較して、GHS-R活性の顕著な増加は認められなかった。図4において、****は、p<0.0001 vs. vehicleを示す。具体的には、図4において、vehicleは電気抵抗変化(ΔZ)が100.0±15.46 (%; mean±S.E.M.)であり、#7は666.7±65.73であり、#7'は155.5±16.47であった。
グレリン受容体は、活性化されると細胞内のカルシウムイオン濃度を上昇させる。そこで、Ca2+ Imaging Assayを用いて細胞内Ca2+濃度を測定することによりGHS-R活性を評価した。35mmの4分割ガラスボトムディッシュに細胞(8×104 cells/well)を播種し、蛍光指示薬Fluo-4(5μM)を負荷した。その後、vehicleまたはGHS-R阻害剤(JMV3002)を3分間前処置し、各試験試薬による蛍光強度の変化を共焦点レーザー顕微鏡で5分間測定した。データは試験試薬添加後の最大値から試験試薬添加前の最小値を差し引いた値を定量化することにより評価した。
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