JP2019533720A - ネオアガロオリゴ糖を含む関節炎または骨粗しょう症の予防、改善または治療用組成物 - Google Patents
ネオアガロオリゴ糖を含む関節炎または骨粗しょう症の予防、改善または治療用組成物 Download PDFInfo
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Abstract
Description
ストレプトマイセスセリカラーA3(2)の染色体DNAをテンプレートとし、下記のプライマー及びEx−Taq(TAKARA)重合酵素を利用して重合連鎖反応(polymerase chain reaction、PCR)を行い、その結果、増幅されたDagA遺伝子断片(DagAのシグナルペプチド及び完成型ペプチドが暗号化された947bp長さの断片として、配列番号1の塩基配列両末端にプライマーの一部配列が連結された状態に該当する)を収得した。
Asm−F(フォワードプライマー):5’−GACATATGGTGGTCAACCGACGTGATC−3’(NdeI)(配列番号3)
Asm−R(リバースプライマー):5’−GGTGGATCCCTACACGGCCTGATACG−3’(BamHI)(配列番号4)
上記実施例1で収得したDagA酵素のアガラーゼ活性を還元当量検証方法(DNS method)で測定した。実施例1で収得したDagA酵素をPBS溶液に10mg/mlの濃度で溶解させて製造したDagA酵素液100μlと0.2%(w/v)の濃度でアガロースを溶かした50mM PBS溶液(pH7)3.9mlを混合し、40℃で5分間反応させた後、これにDNS試薬(ジニトロサリチル酸 6.5g、2M NaOH 325ml及びglycerol 45mlを蒸留水1lに溶解して製造した)4mlを入れて10分間沸騰してから冷やし、吸光度を540nmで測定した。酵素1U(Unit)は、540nmにおける吸光度が0.001である活性で定義した。
1.5%(w/v)の濃度で寒天を溶かした20mM Tris−HCl溶液1lを製造し、100℃で約10分間加熱した後、40℃に温度を下げ、これに125U/ml濃度のDagA酵素水溶液を全体試料の量を基準として20,000Uとなるように処理して、約24時間反応させた。その後、酵素反応産物を遠心分離して未分解された寒天を除去し、上澄液を回収した後、TLCを利用して酵素反応生成物を確認した。回収した上澄液を限外ろ過膜(5KDa カットオフ膜)でろ過して部分精製した。ろ過膜を通過したDagA酵素反応産物を凍結乾燥して固形化し、固形化されたDagA酵素反応産物を保管して、以後の実験に使用した。上記過程を繰り返しながら、4バッチに該当する部分精製された酵素反応産物を収得した。
上記実施例3で収得した酵素反応産物のネオアガロオリゴ糖組成をHPLC−ELSD分析を通じて確認した。HPLC−ELSD分析条件は、以下の通りである。
*移動相:アセトニトリルと水との混合溶液(アセトニトリル:水の体積比は65:35である)
上記実施例3で収得した部分精製された酵素反応産物をゲルろ過クロマトグラフィー(GPC;製品名:BioGel P−2 gel、Biorad、Cat.No.:150−4115)を通じてネオアガロヘキサオース(neoagarohexaose、DP6)、ネオアガロテトラオース(neoagarotetraose、DP4)及びネオアガロビオース(neoagarobiose、DP2)と分離及び精製した。その後、精製した産物を凍結乾燥して固形化し、固形化されたDagA酵素精製産物を保管して、以後の実験に使用した。精製した産物であるDP2、DP4及びDP6の純度をTLCとHPLCを通じて確認したところ、約85%(w/w)のレベルであった。
6−1.実験方法
(1)関節リウマチ患者の滑膜細胞の培養
関節リウマチ患者の関節置換手術時に関節組織を分離した後、collagenaseで処理して滑膜細胞を分離した。分離した関節リウマチ患者の滑膜細胞を10%FBS(Fetal bovine serum)の濃度が10重量%であるDMEM(ダルベッコ改変イーグル培地)培地で培養した。本実験では、継代(passage)が5〜10の細胞を使用し、細胞を6−ウェルプレートにウェル当り3×105の量で接種し、炎症性サイトカインであるIL−17で刺激を与え、ネオアガロオリゴ糖混合物の効果を得るために滑膜細胞を実施例3で収得した部分精製されたDagA酵素反応産物(以下、「NAO」という)で前処理した。
血液をPBS溶液と1:1の体積比で混ぜて血液緩衝液を製造した。以後、血液緩衝液が収容されたチューブにフィコール(Ficoll)をフィコール層が乱れないようにゆっくり浮上した後(フィコール対血液緩衝液の重量比は1:4である)、2000rpmで30分間遠心分離してバフィーコート(buffy coat)層だけを取った。その後、取ったバフィーコート(buffy coat)層を新しいチューブに入れて、PBSで洗浄し、末梢血単核細胞(PBMC)を収得した。その後、末梢血単核細胞(PBMC)を48−ウェルプレートにウェル当り5×105の量で接種し培養した。末梢血単核細胞の破骨細胞への分化誘導のためにM−CSFとIL−17刺激を与え、ネオアガロオリゴ糖混合物の分化抑制効果を得るために末梢血単核細胞を実施例3で収得した部分精製されたDagA酵素反応産物(以下、「NAO」という)で前処理した。
Real−time PCRを通じて特定遺伝子の発現レベルを分析した。PCRを行う時に使用した特定の遺伝子別プライマーを表1に示した。
また、real−time PCRを分析する時に、SYBR Green I(Roche Diagnostic、Mannheim、Germany)を使用して核酸を標識し、Light Cycler instrument(Roche Diagnostic)を使用して蛍光強度を測定した。
48−ウェルプレートの各ウェルに細胞を入れ、細胞固定のために各ウェルにフォルムアルデヒド1mlを入れた後、常温で10分間放置した。その後、固定液を吸引(suction)して、蒸留水で3回洗浄した。その後、各ウェルにTRAP染色溶液(Sigma、USA)を入れて、37℃のインキュベーターで30分間反応させた。その後、各ウェルに蒸留水を入れて吸引することを3回繰り返した後、顕微鏡で測定した。
(1)関節リウマチ患者の滑膜細胞でネオアガロオリゴ糖混合物の破骨細胞誘導因子の抑制効果
図4は、ネオアガロオリゴ糖混合物(NAO)が関節リウマチ患者の滑膜細胞で破骨細胞誘導因子であるRANKL(Receptor activator of nuclear factor kappa−B ligand)の発現に及ぼす影響を示したものである。図4に示すように、関節リウマチ患者の滑膜細胞に炎症性サイトカインであるIL−17を処理すると、破骨細胞誘導因子であるRANKLの活性が増加するが、ネオアガロオリゴ糖混合物(実施例3で収得した部分精製されたDagA酵素反応産物、NAO)を処理すると、濃度依存的にRANKLの発現を減少させた。
図5は、ネオアガロオリゴ糖混合物(NAO)が関節リウマチ患者の滑膜細胞で炎症性サイトカインであるIL−6の発現に及ぼす影響を示したものである。図5に示すように、関節リウマチ患者の滑膜細胞に炎症性サイトカインであるIL−17を処理すると、炎症性サイトカインであるIL−6の活性が増加するが、ネオアガロオリゴ糖混合物(実施例3で収得した部分精製されたDagA酵素反応産物、NAO)を処理すると、濃度依存的にIL−6の発現を減少させた。
ヒト末梢血単核細胞を分離し、破骨細胞への分化を誘導するために炎症性サイトカインであるIL−17を処理して刺激を与え、ネオアガロオリゴ糖混合物で前処理した群と前処理しなかった対照群のTRAP染色を行った。図6は、ネオアガロオリゴ糖混合物(NAO)の末梢血単核細胞の破骨細胞への分化誘導条件で破骨細胞への分化に及ぼす影響を示したものである。図6に示すように、ヒト末梢血単核細胞にネオアガロオリゴ糖混合物(実施例3で収得した部分精製されたDagA酵素反応産物、NAO)を高濃度で処理する場合、破骨細胞への分化が顕著に抑制された。
Claims (8)
- ネオアガロオリゴ糖混合物を有効成分として含む組成物であって、
前記ネオアガロオリゴ糖混合物は、ネオアガロビオース(neoagarobiose)、ネオアガロテトラオース(neoagarotetraose)及びネオアガロヘキサオース(neoagarohexaose)を含み、
単核細胞の破骨細胞への分化によって発生するか進行される関節炎または骨粗しょう症を予防または治療するための用途の薬学組成物。 - 前記ネオアガロオリゴ糖混合物は、ネオアガロオリゴ糖混合物の総重量を基準としてネオアガロビオース(neoagarobiose)1〜10重量%、ネオアガロテトラオース(neoagarotetraose)55〜75重量%、及びネオアガロヘキサオース(neoagarohexaose)20〜40重量%を含むことを特徴とする請求項1に記載の薬学組成物。
- 寒天(Agar)またはアガロース(Agarose)から選択される基質とストレプトマイセスセリカラー(Streptomyces coelicolor)由来のベータ−アガラーゼであるDagAとの酵素反応産物またはその精製物を有効成分として含む組成物であって、
前記酵素反応産物またはその精製物は、
ネオアガロビオース(neoagarobiose)、ネオアガロテトラオース(neoagarotetraose)及びネオアガロヘキサオース(neoagarohexaose)を含み、
単核細胞の破骨細胞への分化によって発生するか進行される関節炎または骨粗しょう症を予防または治療するための用途の薬学組成物。 - 前記酵素反応産物またはその精製物は、
ネオアガロオリゴ糖総重量を基準としてネオアガロビオース(neoagarobiose)1〜10重量%、ネオアガロテトラオース(neoagarotetraose)55〜75重量%、及びネオアガロヘキサオース(neoagarohexaose)20〜40重量%を含むことを特徴とする請求項3に記載の薬学組成物。 - ネオアガロオリゴ糖混合物を有効成分として含む組成物であって、
前記ネオアガロオリゴ糖混合物は、ネオアガロビオース(neoagarobiose)、ネオアガロテトラオース(neoagarotetraose)及びネオアガロヘキサオース(neoagarohexaose)を含み、
単核細胞の破骨細胞への分化によって発生するか進行される関節炎または骨粗しょう症を予防または改善するための用途の食品組成物。 - 前記ネオアガロオリゴ糖混合物は、
ネオアガロオリゴ糖混合物の総重量を基準としてネオアガロビオース(neoagarobiose)1〜10重量%、ネオアガロテトラオース(neoagarotetraose)55〜75重量%、及びネオアガロヘキサオース(neoagarohexaose)20〜40重量%を含むことを特徴とする請求項5に記載の食品組成物。 - 寒天(Agar)またはアガロース(Agarose)から選択される基質とストレプトマイセスセリカラー(Streptomyces coelicolor)由来のベータ−アガラーゼであるDagAとの酵素反応産物またはその精製物を有効成分として含む組成物であって、
前記酵素反応産物またはその精製物は、
ネオアガロビオース(neoagarobiose)、ネオアガロテトラオース(neoagarotetraose)及びネオアガロヘキサオース(neoagarohexaose)を含み、
単核細胞の破骨細胞への分化によって発生するか進行される関節炎または骨粗しょう症を予防または改善するための用途の食品組成物。 - 前記酵素反応産物またはその精製物は、
ネオアガロオリゴ糖総重量を基準としてネオアガロビオース(neoagarobiose)1〜10重量%、ネオアガロテトラオース(neoagarotetraose)55〜75重量%、及びネオアガロヘキサオース(neoagarohexaose)20〜40重量%を含むことを特徴とする請求項7に記載の食品組成物。
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