JP6855263B2 - ジペプチジルペプチダーゼ−iv阻害剤 - Google Patents
ジペプチジルペプチダーゼ−iv阻害剤 Download PDFInfo
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- JP6855263B2 JP6855263B2 JP2017013068A JP2017013068A JP6855263B2 JP 6855263 B2 JP6855263 B2 JP 6855263B2 JP 2017013068 A JP2017013068 A JP 2017013068A JP 2017013068 A JP2017013068 A JP 2017013068A JP 6855263 B2 JP6855263 B2 JP 6855263B2
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- blood glucose
- dpp
- tea
- inhibitor
- glucose level
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Description
すなわち、本発明は茶カテキン類および茶カテキン代謝物を有効成分とするDPP-IV阻害活性剤を提供するものである。DPP-IVの活性を阻害し、インクレチンの分解を抑制することにより、インクレチンの持つインシュリン分泌促進およびグルカゴン分泌抑制機能を正常に発揮させることによる血糖値調節剤を提供するものである。
本発明では、特にピロガロール構造を有する茶カテキン類および茶カテキン代謝物で高いDPP-IV阻害活性を有することを見出した。ピロガロール構造を有するのは茶由来のカテキンに特有の構造である。これら茶カテキン類および茶カテキン代謝物に関するDPP-IV阻害作用に関する報告例はなく、全く新しい知見である。すなわち、本発明は、以下の通りである。
[2][1]の式(III)〜式(VII)の化合物群から選ばれる1種または2種以上を有効成分とするDPP-IV阻害剤を含有する血糖値調節剤、
[3][1]のDPP-IV阻害剤、又は[2]の血糖値調節剤を含有する医薬品、
[4][1]のDPP-IV阻害剤、又は[2]の血糖値調節剤を有効成分とするDPP-IV阻害用、または血糖値調節用の飲食品又はサプリメント、
[5]以下の式で表される化合物を有効成分として含有する血糖値調節剤、
[7][5]の血糖値調節剤を有効成分とする血糖値調節用飲食品又はサプリメント、を提供するものである。
また本発明によれば、DPP-IV阻害、並びにDPP-IV阻害作用による血糖値上昇抑制又は低血糖を改善する血糖値調節を目的とする機能性食品を提供することができる。
茶カテキン類の組成物に関しては、特公平1-44234号公報、特公平2-12474号公報、特公平2-22755号公報、特開平4-20589号公報、特開平5-260907号公報、特開平8-09178号公報などに記載された方法により製造することが出来る。また、本発明の茶カテキン類は市販品を用いても良く、このような市販品としては、例えば三井農林株式会社の「ポリフェノン」、株式会社伊藤園の「テアフラン」、太陽化学株式会社の「サンフェノン」などを例示することが出来る。また、さらに精製したカテキン類についても市販品を用いても良い。例えば、シグマアルドリッチ株式会社より販売されているEpigallocatechin(E3768), Epigallocatechingallate (E4143), Gallocatechin (G6657), Gallocatechin solution (49047-U), Epicatechin gallate solution (49060-U)などを例示することが出来る。
また、式(VII)記載のピロガロールはシグマアルドリッチ株式会社を始め、和光純薬株式会社、東京化成工業株式会社など試薬メーカー各社の市販品を使用してもよい。
製造例1:有機合成方法による5−(3,4−ジヒドロキシフェニル)-吉草酸(VI-b)の製造方法
[DPP-IV阻害活性の測定]
DPP-IV阻害活性の測定にはDPP(IV) Inhibitor Screenning Assay Kit(item No. 700210、ケイマンケミカルカンパニー U.S.A)を用いた。
緩衝液:20mM Tris-HCl緩衝液(pH8.0、100mM NaClおよび1mM EDTAを含む)
酵素液:ヒト組換えDPP-IV(キット付属の酵素液を緩衝液で5倍希釈した)
基質液:0.2mMグリシルプロリン-4-メチルクマリル-7-アミド
あらかじめ、茶カテキン類およびカテキン代謝物をそれぞれ10mMの濃度になるよう、5%メタノール水溶液で調製した。この各サンプル液を5%メタノール水溶液で、さらに5段階に希釈(希釈率1/5〜1)した。キットに付随した96穴のマルチウェルプレートに各サンプルの溶液を10μLずつ入れた。そこに緩衝液30μL、酵素液10μLを入れた後、基質液50μLを加え、よく混合した。DPP-IVによって遊離する7-アミノ-4-メチルクマリンの蛍光を、プレートリーダーCYTOFLUOR Series 4000(パーセプティブバイオシステムズ)を用い、37℃で30分間反応させながら5分間隔で測定した。励起波長は360nm、蛍光波長は460nmとした。
ブランクとして、サンプル溶液の代わりに5%メタノール水溶液10μLを添加した場合の蛍光も同時に測定した。各サンプルにおける5分間隔の蛍光強度を縦軸に設定し、横軸に時間を設定して測定値をグラフにプロットし、近似直線を作成した。この近似直線の傾きを反応速度として反応の強さを評価した。ブランクの反応速度を100とした場合の、各サンプルの反応速度を阻害率(%)として評価した。各サンプルについて5段階の濃度設定で阻害率(%)を算出した。この結果をさらに横軸に濃度、縦軸に阻害率(%)と設定し、グラフにプロットし、近似曲線を作成した。この近似曲線から各サンプルにおける阻害率50%の時のサンプル濃度を算出し、IC50値として評価した。
以下の配合になるように各原料を混合した。
1.EGCg 25.0重量%
2.結晶セルロース 35.0重量%
3.ビタミンC 15.0重量%
4.澱粉分解物 12.0重量%
5.グリセリン脂肪酸エステル 5.0重量%
6.二酸化ケイ素 4.0重量%
7.糊料(カルボキシメチルセルロース) 2.0重量%
8.コート剤 2.0重量%
混合して得られた粉末を打錠成型することによりEGCgを含有する錠剤を得た。
以下の配合になるように各原材料を混合し、本発明のカテキン代謝物を含有するDPP-IV阻害を目的とした粉末緑茶飲料を調製した。
1.デキストリン 64.9重量%
2.緑茶パウダー 30.0重量%
3.カテキン代謝物(R)-5-(3,4,5-トリヒドロキシフェニル)-γ-バレロラクトン 0.1重量%
4.ビタミンC 5.0重量%
市販無糖茶飲料として緑茶(サントリー食品インターナショナル株式会社製)500mLに5-(3,4,5-トリヒドロキシフェニル)-吉草酸0.1gを添加溶解後、常法にて殺菌し、本発明のカテキン代謝物を含有する血糖値調節を目的とした無糖茶飲料を得た。
Claims (7)
- 請求項1に記載の式(III)〜式(VII)の化合物群から選ばれる1種または2種以上を有効成分とするジペプチジルペプチダーゼ-IV阻害剤を含有する血糖値調節剤。
- 請求項1に記載のジペプチジルペプチダーゼ-IV阻害剤、又は請求項2に記載の血糖値調節剤を含有する血糖値調節用の医薬品。
- 請求項1に記載のジペプチジルペプチダーゼ-IV阻害剤、又は請求項2に記載の血糖値調節剤を有効成分とするジペプチジルペプチダーゼ-IV阻害用、又は血糖値調節用飲食品又はサプリメント。
- 請求項5に記載の血糖値調節剤を有効成分として含有する血糖値調節用の医薬品。
- 請求項5に記載の血糖値調節剤を有効成分とする血糖値調節用飲食品又はサプリメント。
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