JP6077899B2 - アセトアルデヒドデヒドロゲナーゼ阻害剤 - Google Patents
アセトアルデヒドデヒドロゲナーゼ阻害剤 Download PDFInfo
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- JP6077899B2 JP6077899B2 JP2013058297A JP2013058297A JP6077899B2 JP 6077899 B2 JP6077899 B2 JP 6077899B2 JP 2013058297 A JP2013058297 A JP 2013058297A JP 2013058297 A JP2013058297 A JP 2013058297A JP 6077899 B2 JP6077899 B2 JP 6077899B2
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- glucosylglycerol
- aldh
- sake
- acetaldehyde
- fraction
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Description
ALDH活性の測定
C57/BL6マウスから肝臓を摘出し、肝臓重量の4倍量の緩衝液(0.25M sucrose−50mM Tris,pH 7.40,0.1mMDTT)を加えてホモジナイズした。得られたホモジネートを800gにて15分間遠心して、核及びデブリス(細胞片)を取り除いた。その後、得られた上清を12000gにて15分間遠心し、ミトコンドリア画分を沈殿させ回収した。残った上清を再度遠心し、残存するミトコンドリアを回収した。ミトコンドリア画分を上記緩衝液に再浮遊させ、遠心して再沈殿させた後、組織重量の1容量の緩衝液に浮遊させ、0℃において10秒間、3回超音波粉砕した。超音波粉砕することによって得られたサンプルのタンパク質の定量はBradford法を用いて行った。得られたミトコンドリア画分(サンプル)は使用するまで−80℃で保存した。
酵素は、トランスグルコシダーゼL「アマノ」(天野エンザイム株式会社製、商品名)を、マルトースの量に対して0.1%使用した。マルトース50g(10%),グリセロール125g(25%)を酢酸ナトリウム緩衝液(pH5.0)500mlに溶解し、上記酵素の存在下、40℃にて一晩反応させた。反応終了後、95℃にて10分間加熱することによって上記酵素を失活させた。得られた反応液を配位子カラムSPC810(昭和電工社製、商品名Shodex)によって分離し、α−グルコシルグリセロールをフラクションコレクターにて分取した。
エバポレーターによって、日本酒からアルコール分を除去し、サンプル(日本酒サンプル)を得た。この日本酒サンプルに含まれるALDH阻害物質の分子量を推定する目的で、分子量7000カットの透析チューブを用いて上記透析チューブを透過した成分が含まれる低分子画分と、上記透析チューブを透過しなかった成分が含まれる高分子画分とに分画した。得られた低分子画分及び高分子画分のALDH阻害活性を測定した。その結果、低分子画分に阻害活性が認められた(図1)。次に吸着樹脂XAD2(オルガノ社製、商品名:アンバーライトXAD2)による分画を行った。上記日本酒サンプルをXAD2に通液後、20%メタノール水溶液、50%メタノール水溶液、100%メタノールを順次通液し、それぞれの溶出画分を得た。得られた画分のうち、XAD2非吸着画分にALDH阻害活性が認められた(図2)。日本酒に含まれるALDH阻害物質はXAD2への吸着性を示さず、親水性の高い物質であることが予想されたことから、XAD2非吸着画分を弱塩基性陰イオン交換樹脂(オルガノ株式会社製、商品名Amberlite XE583)又は弱酸性陽イオン交換樹脂(オルガノ株式会社製、商品名Amberlite FPC3500)に通液し、ALDH阻害活性を評価した。その結果、弱塩基性陰イオン交換樹脂への通液によってALDH阻害活性が消失し、弱酸性陽イオン交換樹脂への通液ではALDH阻害活性の消失は認められなかった(図3)。ここまでの日本酒の分画のスキームを図4にまとめる。
TSK−gel NH2カラムによる分離にて得られたフラクション10について、LC/TOF−MSによって精密質量を測定した。Asahipak NH2カラムを用いた分離でESIによる検出では3つのピークが得られた(図7(a))。それぞれのピークの精密質量と推定分子式はピーク1:181.0709m/z,C6H14O6(図7(b))、ピーク2:253.0929m/z,C9H18O8(図7(c))、ピーク3:179.0561m/z,C6H12O6(図7(d))であった。それぞれのピークについて化合物データベースによる検索と、日本酒に含まれるALDH阻害物質の紫外吸収が弱いといった情報から、ピーク1がマンニトール又はソルビトールであり、ピーク2がα−グルコシルグリセロール(α−GG)であり、ピーク3がグルコース又はガラクトースであると推察された。これらの化合物のうち、標品が市販されているグルコース及びガラクトース(ピーク3)、並びにマンニトール及びソルビトール(ピーク1)については10mg/mlの濃度でもALDH活性の阻害は認められなかった。α−グルコシルグリセロール(ピーク2)については標品が市販されていないため、酵素を用いて合成することにした。
α−グルコシルグリセロールは、マルトースとグリセロールとからα−グルコシダーゼによる糖転移反応によって合成できることが知られている。そこで、同様の方法でα−グルコシルグリセロールを合成した後、分離及び精製することによってα−グルコシルグリセロールの標品を調製した。非特許文献2に記載の方法によりマルトースとグリセロールからα−グルコシダーゼの反応により、α−グルコシルグリセロールを合成した。酵素による合成後の反応液には目的産物であるα−グルコシルグリセロール以外に基質であるマルトース、グリセロール及び糖転移反応によって生成するグルコースが含まれている。配位子カラムShodex Sugar SPO810(昭和電工社製、商品名Shodex)により分離し、α−グルコシルグリセロールを精製した(移動相:H2O、カラム温度:80℃、流量:0.8ml/分)。フラクションコレクターを用いて酵素反応液からα−グルコシルグリセロールのみを分取した。分取によって得られた画分はほぼα−グルコシルグリセロールであり(図8(a))、10mg/mlの濃度でALDH阻害活性が認められた(図8(b))。これら一連の分離及び同定の作業によって日本酒に含まれるα−グルコシルグリセロールがALDHを阻害する物質であることが明らかとなった。
Claims (3)
- グルコシルグリセロールを有効成分として含有するアセトアルデヒドデヒドロゲナーゼ阻害剤。
- グルコシルグリセロールを有効成分として含有する抗酒薬。
- グルコシルグリセロールを有効成分として含有するアルコール依存症の治療薬。
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