JP6142936B2 - β‐セクレターゼ阻害剤及びβ‐セクレターゼ阻害用飲食品 - Google Patents
β‐セクレターゼ阻害剤及びβ‐セクレターゼ阻害用飲食品 Download PDFInfo
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- JP6142936B2 JP6142936B2 JP2016042587A JP2016042587A JP6142936B2 JP 6142936 B2 JP6142936 B2 JP 6142936B2 JP 2016042587 A JP2016042587 A JP 2016042587A JP 2016042587 A JP2016042587 A JP 2016042587A JP 6142936 B2 JP6142936 B2 JP 6142936B2
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- secretase
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- curcumin
- secretase inhibitor
- inhibitor
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Description
カレーリーフの抽出物としては、葉の乾燥物のヘキサン抽出物を好適に用いることができる。その理由は、カレーリーフの葉をヘキサンで抽出することにより、α‐カリオフィレン、β‐カリオフィレン及びβ‐カリオフィレンオキサイドを多く溶出させることができるからである。
ターメリックの抽出物としては、根の乾燥物の酢酸エチル抽出物を好適に用いることができる。その理由は、ターメリックの根を酢酸エチルで抽出することにより、クルクミン1、クルクミン2及びクルクミン3を多く溶出させることができるからである。
コショウの抽出物としては、果実の乾燥物の酢酸エチル抽出物を好適に用いることができる。その理由は、コショウの果実を酢酸エチルで抽出することにより、ピペリンを多く溶出させることができるからである。
ゴマの抽出物は、乾燥物の酢酸エチル抽出物を好適に用いることができる。その理由は、ゴマを酢酸エチルで抽出することにより、セサミンを多く溶出させることができるからである。
このうち、賦形剤としては、これらに限定されないが例えば、微粒子二酸化ケイ素のような粉末類、ショ糖脂肪酸エステル、結晶セルロース・カルボキシメチルセルロースナトリウム、リン酸水素カルシウム、小麦デンプン,米デンプン,トウモロコシデンプン,バレイショデンプン,デキストリン,シクロデキストリン等のでんぷん類、結晶セルロース類、乳糖,ブドウ糖,砂糖,還元麦芽糖,水飴,フラクトオリゴ糖,ガラクトオリゴ糖,大豆オリゴ糖,イソマルトオリゴ糖,キシロオリゴ糖,マルトオリゴ糖,乳果オリゴ糖などの糖類、ソルビトール,エリストール,キシリトール,ラクチトール,マンニトール等の糖アルコール類が挙げられる。これらの賦形剤は、単独で又は二種以上組み合わせて使用することができる。
(試薬の調製−1)
酢酸ナトリウム(分子量:82.03)4.1gに酢酸400mlを加えて溶解させpH4.5に調整した。溶液を純水で500mlにメスアップし、0.1M酢酸緩衝液(1)を得た。
基質ペプチドMOCAc−ser−Glu−Val−Asn−Leu−Asp−Ala−Glu−Phe−Arg−Lys(Dnp)−Arg−Arg−NH2((Trifluoroacetate Form)、分子量:2001.08、Peptide Institute 3212−v)を1mMになるようにDMSO550μl中に溶解させ基質ペプチド溶液(2)を得た。
上記0.1M酢酸緩衝液(1)を水で5倍希釈し、0.1%Triton X−100を加え、20mM酢酸緩衝液(3)を得た。
β‐セクレターゼ(β‐Secretase,extacellular domain human,recombinant Sigma S−4195)を、20mM酢酸緩衝液(3)で50倍希釈し、100Units/mlに調整し、β‐セクレターゼ溶液(4)を得た。
基質ペプチド溶液(2)を20mM酢酸緩衝液(3)で10倍希釈し、基質希釈溶液(5)を得た。
表1及び表2に記載の3種のカレーパウダー及びゴマについて、乾燥原料を1kg粉砕し、40℃のヘキサン5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、ヘキサン抽出物を得た。
次いで、その残渣を40℃の酢酸エチル5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、酢酸エチル抽出物を得た。
次いで、その残渣を40℃のメタノール5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、メタノール抽出物を得た。
78μlの20mM酢酸緩衝液(3)、10μlのβ‐セクレターゼ溶液(4)、及び上記抽出物2μlを混合し、溶液(6)を調製した。78μlの20mM酢酸緩衝液(3)、10μlのβ‐セクレターゼ溶液(4)、及び2μlのDMSOの混合物を混合し、溶液(7)を得た。溶液(6)及び溶液(7)を96ウェルプレート(黒)に添加し、37℃で10分間インキュベートし、それぞれ試料溶液及びコントロール溶液を得た。これらに10μlの基質ペプチド希釈溶液(5)及び20mM酢酸緩衝液を加え、サンプル濃度を1.25%(250μg/ml)及び0.25%(50μg/ml)に調整し、37℃で3時間インキュベートした。イオン強度I=0.15のリン酸緩衝液(pH7.0)900μlを加え反応を停止させた。
この反応生成物をHPLCで分離し、試料溶液及びコントロール溶液それぞれの蛍光標識分解生成物の発光強度を測定した。
(HPLC条件)
A液:0.1%ギ酸アセトニトリル、B液:0.1%ギ酸水
0分:A液10%、B液90%
グラジエント25分:A液60%、B液40%
25.01分:A液90%、B液10%
30分:A液10%、B液90%
検出器:蛍光検出器EX328nm、EM393nm
Flow Rate 1ml/min
カラム:L‐カラムODS250mm、4.6mm
式中、Cはコントロール溶液中の蛍光標識分解生成物の発光強度を示し、Sは試料溶液中の蛍光標識分解生成物の発光強度を示す。結果を表1及び表2に示す。
上記カレーリーフのへキサン抽出物10gを、カラムクロマトグラフィー(シリカゲル60 500g、メルク社製)を用い、ヘキサンで溶出した。さらに順次、ヘキサン‐酢酸エチルの混合液で溶出した。溶媒の量と流液比、及び収量を下記表3に示す。
次いで、カレーリーフのヘキサン抽出物のFR1〜18のβ‐セクレターゼ阻害活性を上述した方法と同様の方法で評価した。結果を下記表4に示す。
次いで、FR1及びFR2の化合物を定量した。定量方法は各標準品より絶対検量線法にて、下記の条件で行った。
(分析条件)
分析機器:GC6980(アジレント社製)
注入量:1.0u
スプリット比:1/80
インジェクション温度:250℃
カラム:inertcap pure wax 60m 0.25mm
カラム温度:50℃(2分)→2.5℃/分→240℃
この結果からIC50を計算すると以下の数値となった。
α‐カリオフィレン :2.3mM
β‐カリオフィレンオキサイド:1.2mM
β‐カリオフィレン :4.2mM
その結果、ターメリックの酢酸エチル抽出物にクルクミン1が29.82%、クルクミン2が9.79%、クルクミン3が6.42%、クルクミノイドが46.03%含有されており、コショウの酢酸エチル抽出物にピペリンが72.73%、ゴマの酢酸エチル抽出物にセサミンが5.9%含有されており、これら化合物が高いβ‐セクレターゼ阻害活性を有することがわかった。クルクミン1、クルクミン2及びクルクミン3のβ‐セクレターゼ阻害率を下記表11に、ピペリンのβ‐セクレターゼ阻害率を下記表12に、セサミンのβ‐セクレターゼ阻害率を下記表13に示す。
この結果からクルクミン1、クルクミン2、クルクミン3、ピペリンについてIC50を計算すると以下の数値となった。
クルクミン1:0.56mM
クルクミン2:0.63mM
クルクミン3:1.50mM
ピペリン :0.58mM
カルダモン、クローブ、シナモン、フェヌグリーク、サフラン、ジンジャー、バンウコン、ガジュツ、カホクザンショウ、ホップ、アシュワガンダ、ベニバナ、ヒハツ及びハルウコン夫々20gを5倍量の70vol%メタノールにて、40℃で攪拌抽出を2回行った。ついで、減圧濃縮し、70%メタノール抽出物を得た。
別途、上記植物について、乾燥原料を1kg粉砕し、40℃のヘキサン5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、ヘキサン抽出物を得た。
次いで、その残渣を40℃の酢酸エチル5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、酢酸エチル抽出物を得た。
次いで、その残渣を40℃のメタノール5000mlで2時間の攪拌抽出を2回行った。次いで、40℃で減圧濃縮し、メタノール抽出物を得た。
70%メタノール抽出物のβ‐セクレターゼ阻害率を下記表14,15に、ヘキサン抽出物のβ‐セクレターゼ阻害率を下記表16,17に、酢酸エチル抽出物のβ‐セクレターゼ阻害率を下記表18,19に、メタノール抽出物のβ‐セクレターゼ阻害率を下記表20,21に示す。
Claims (6)
- ピぺリン(化1)、セサミン(化2)からなる群から選択されるメチレンジオキシベンゼンを有する化合物を有効成分として含有し、β−セクレターゼの活性を阻害するβ−セクレターゼ阻害剤。
- ピペリンが、コショウの抽出物から得られるものであることを特徴とする、請求項1記載のβ−セクレターゼ阻害剤。
- セサミンが、ゴマの抽出物から得られるものであることを特徴とする、請求項1記載のβ−セクレターゼ阻害剤。
- コショウの抽出物を有効成分として含有し、前記抽出物が、ピペリンを含み、β−セクレターゼの活性を阻害するβ−セクレターゼ阻害剤。
- ゴマの抽出物を有効成分として含有し、前記抽出物が、セサミンを含み、β−セクレターゼの活性を阻害するβ−セクレターゼ阻害剤。
- 請求項1乃至5のいずれかに記載のβ−セクレターゼ阻害剤を含む、β−セクレターゼの活性を阻害するβ−セクレターゼ阻害用飲食品。
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