JP5950395B2 - 卵白アルブミン分解物を含有する脂質代謝改善剤 - Google Patents
卵白アルブミン分解物を含有する脂質代謝改善剤 Download PDFInfo
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- JP5950395B2 JP5950395B2 JP2012167536A JP2012167536A JP5950395B2 JP 5950395 B2 JP5950395 B2 JP 5950395B2 JP 2012167536 A JP2012167536 A JP 2012167536A JP 2012167536 A JP2012167536 A JP 2012167536A JP 5950395 B2 JP5950395 B2 JP 5950395B2
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Description
(1) 卵白アルブミンをペプシンにより消化し、熱処理することによって得られる卵白アルブミン分解物。
(2) Trp-Thr-Ser-Ser-Asnからなるペプチドを含有する、(1)に記載の卵白アルブミン分解物。
(3) (1)に記載の卵白アルブミン分解物、またはTrp-Thr-Ser-Ser-Asnからなるペプチドを有効成分として含有する脂質代謝改善剤。
(4) (1)に記載の卵白アルブミン分解物、またはTrp-Thr-Ser-Ser-Asnからなるペプチドを有効成分として含有する脂肪酸合成酵素(FAS)阻害剤。
(5) (1)に記載の卵白アルブミン分解物、またはTrp-Thr-Ser-Ser-Asnからなるペプチドを含む飲食品。
(6) 前記飲食品が、健康食品、機能性食品、栄養補助食品、または特定保健用食品である、(5)に記載の飲食品。
(7) (1)に記載の卵白アルブミン分解物、またはTrp-Thr-Ser-Ser-Asnからなるペプチドを含む医薬品。
(8) (1)に記載の卵白アルブミン分解物、またはTrp-Thr-Ser-Ser-Asnからなるペプチドを含む飼料。
卵白アルブミン(OVA;Wako)75gを蒸留水1000mlに懸濁し、HClでpHを2.0に調整した。この液にペプシン(Sigma)1gを添加し、37℃にて3時間攪拌した後、6N-HClでpHを再調整し、さらに37℃にて3時間攪拌しながら反応させた。消泡剤を反応液1000mlに対して0.165g添加し、Na2CO3にてpHを5に調整した後、95℃にて10分間加熱処理し、遠心分離(3000回転、10分間)して不溶性の熱凝固画分を除去した。次いで、上澄み液を減圧濃縮し、凍結乾燥・粉末化して本発明の卵白アルブミン分解物(PHOVA)を得た(図1)。
図2に示す給餌・飼育スケジュールに示すとおり、AIN-93配合に準拠したラット用基礎飼料で7日間予備飼育を行なったSD 系ラット(35日齢、オス)をカゼイン(Casein)区(対照)およびPHOVA 区に分け(各区につき7頭)、それぞれ下記表1に示す組成の試験飼料を自由摂取させ、試験飼料給与10日目にラットを解体した。
給餌・飼育スケジュール、ラット系統・性・日齢等は実施例2に準じている。予備飼育後にラットをCasein+普通脂肪(7%)食区、PHOVA+普通脂肪(7%)食区、Casein+高脂肪(27%)食区、PHOVA+高脂肪(27%)食区に分け(各区につき6頭)、それぞれ下記表2に示す組成の試験飼料を自由摂取させ、試験飼料給与10日目にラットを解体した。肝臓脂質の定量はFolch法により行った。1gの肝臓片を酢酸緩衝液中でポリトロンホモジナイザーを用いてホモジナイズし、ホモジネートにクロロホルム:メタノール(2:1)溶液を添加して抽出操作を行い、溶媒画分をナシ型フラスコに回収、ロータリーエバポレータを用いて減圧乾固により溶媒を除去後、脂質重量の測定を行った。
実施例1で調製した卵白アルブミン分解物(PHOVA)を、カットオフメンブレン(ミリポア PLAC02510)用いて窒素ガス加圧による限界ろ過を行い、低分子量画分(分子量1kDa以下)を調製し、5 mgを1 mlの蒸留水に溶解して使用した。FAS阻害ペプチドの分離・精製は逆相での高速液体クロマトグラフィー(日本分光LC-2000Plusシステム;カラム、コスモシルC18-AR-II(10mm×250mm)ナカライテスク)で行った。移動相としてA液(0.1%TFA)およびB液(0.1%TFA/80%アセトニトリル)を用いたリニアグラジエント溶出(流速4.0 ml/分、35分:A液100%→53.4%、B液0→46.6%)を行い、溶出液の220nmにおける吸光度を測定し、ペプチドを分取した。まず、13〜18分に溶出されたピーク群画分にFAS阻害活性が認められたので、この画分の分取を繰り返し、凍結乾燥粉末を得た。次に、この画分をさらに分画するため、リニアグラジエント溶出(流速2.0 ml/分、57分:A液91.9%→90.7%、B液8.1→9.3%)に供し、36〜37分に単一ピークとして溶出したピークを回収して質量分析に供した。
(1) HepG2培養肝細胞の脂肪酸合成速度に対するWTSSNの影響
WTSSN(300μg/mL)およびポジティブコントロールとして代表的な脂肪酸合成酵素阻害剤であるセルレニン(15μg/mL)をDMSO(1%)に溶解してHepG2培養肝細胞の培養液に添加した。無添加区(対照)にはDMSOのみ添加した。合成WTSSN を培地に添加(300μg/mL)して3 時間培養後、[14C]acetate を添加して更に1.5 時間培養し、細胞を回収した。回収した細胞より脂質を抽出し、液体シンチレーションカウンターによる[14C]取込量の測定を行い、これを脂肪酸合成速度とした。その結果、無添加区と比較して、脂肪酸合成速度はWTSSN添加区で30%減少した(図6)。
ArslanianとWakilの方法(Arslanian MJ & Wakil SJ, Methods in Enzymology, Vol 35, 59-65, 1975)に準じて、ニワトリ肝臓より脂肪酸合成酵素(FAS)を単離・精製した。このFASを用いて、Zhaoらの報告(Zhao YX, Liang WJ, Fan HJ, Ma QY, Tian WX, Dai HF, Jiang HZ, Li N, Ma XF. Carbohydr Res. 346(11):1302-1306. 2011)に準じてFAS活性ならびにWTSSNのFAS阻害活性の評価を行った。FASは脂肪酸合成時にNADPHを還元剤として定量的に消費するため、NADPHの吸光度(340nm)の減少(消費)速度からFAS活性の評価を行うことができる。具体的には、100mMリン酸カリウム緩衝液(pH7.0)、1mM EDTA、1mMジチオスレイトール、3μMアセチル-CoA、35μM NADPH、5μg 精製ニワトリFASを含む反応系(1mL)の340nmにおける吸光度を分光光度計(島津製作所UV-1800)でモニターし、まず、FAS非依存的な吸光度の減少を測定した(ブランク反応)。次いで、マロニル-CoA(終濃度10μM)の添加により酵素反応を開始して吸光度の測定を行い、ブランク反応を差し引き、340nmにおけるNADPHの分子吸光係数(6.22×103 M-1cm-1)で除して単位時間あたりのNADPH消費量を算出し、添加したFASタンパク質量で除した値をFAS比活性とした。上記の反応系に、ジメチルスルホキシド(DMSO)に溶解したWTSSNを添加(1.5mg)して酵素反応を行い、上記のようにして求めたFAS比活性により直接的な阻害活性の評価を行った。その結果、無添加区と比較して、FAS活性はWTSSN添加区で42%減少した(図7)。
Claims (7)
- Trp-Thr-Ser-Ser-Asnからなるペプチド。
- Trp-Thr-Ser-Ser-Asnからなるペプチドを有効成分として含有する脂質代謝改善剤。
- Trp-Thr-Ser-Ser-Asnからなるペプチドを有効成分として含有する脂肪酸合成酵素(FAS)阻害剤。
- Trp-Thr-Ser-Ser-Asnからなるペプチドを含む飲食品。
- 前記飲食品が、健康食品、機能性食品、栄養補助食品、または特定保健用食品である、請求項4に記載の飲食品。
- Trp-Thr-Ser-Ser-Asnからなるペプチドを含む医薬品。
- Trp-Thr-Ser-Ser-Asnからなるペプチドを含む飼料。
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