JP6398014B2 - ラマリンを含有する退行性脳疾患の予防または治療用組成物 - Google Patents
ラマリンを含有する退行性脳疾患の予防または治療用組成物 Download PDFInfo
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/185—Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic or hydroximic acids
- A61K31/19—Carboxylic acids, e.g. valproic acid
- A61K31/195—Carboxylic acids, e.g. valproic acid having an amino group
- A61K31/197—Carboxylic acids, e.g. valproic acid having an amino group the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid or pantothenic acid
- A61K31/198—Alpha-amino acids, e.g. alanine or edetic acid [EDTA]
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- A61K31/165—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide
- A61K31/167—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide having the nitrogen of a carboxamide group directly attached to the aromatic ring, e.g. lidocaine, paracetamol
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Description
本発明の他の目的は、ラマリンを有効性分として含有する退行性脳疾患の予防または改善用食品組成物を提供するところにある。
本発明の下記の実施例では2008年1月、南極キングジョージ島のバートン半島(S62°13.1、W58°47.0)で採集したラマリナ・テレブラタ(Ramalina terebrata)からメタノールを利用した分離方法でラマリンを分離(KR10−1025612)して使用するか、また天産物由来のラマリンと同じ効能を示す安定したラマリンを合成(KR10−1182334)して使用した(図1A)。
APP/PS1形質転換マウスに対するラマリンの記憶力向上効果を確認するために、既に知られたモリス法を若干変形して実施した。水槽は、高さ35cm、径100cmの原形で、無毒性の水溶性の黒の染料を入れて、水温を20℃に維持した。水槽を4等分して、その中一つの中間に水面から1cm程度下方に黒のプラットホーム(高さ10cm、径8cm)を位置させた。様々な空間手がかりを入れた水槽のプラットホームで水泳を開始させたマウスをビデオシステム(Ethovirion system Noldus,Wageningen,Netherlands)で観察した。水中迷路教育は、マウスが60秒間プラットホームを探すことができなければ、一日に2回の機会をさらに与えた。各試みは15分の休息時間を設けた後実施して、4日連続実施した。各マウスが、各実験での示す時間を測定して平均値を得た。マウスがプラットホームを探せば、10秒間留まるようにして、もしマウスが120秒内にプラットホームを探すことができなければ、実験者がプラットホームに10秒間いるように誘導した。6日目には水槽でプラットホームを除去した後、60秒間プローブテストを行った。
Y迷路は三つの通路(arm)がY字型に延びて、各通路は長さ40cm、高さ12cm、幅3cmとそれぞれ120°の角度で位置する。迷路底と壁は、不透明な暗色のポリビニールプラスチック材質であり、マウスは最初一つの通路で順に位置(i.e.,ABCAB etc.)させた後、8分間通路を通過することを記録した。マウスの動きを交差回数で示し、連続的に三つの通路を通過した場合だけ一回交差したと定義した(i.e.,ABC、CAB、またはBCA、しかしBABではない)。迷路の通路は、臭いをきれいに除去して掃除して、最後のラマリンを投与(10および20mg/kg)してから、一時間後にラマリンによる記憶損傷抑制を測定した。交差比率は下記の通り定義される。
%交差=[(交差回数)/(総通路通過回数)]×100
その結果、ラマリン濃度20mg/kg投与群で記憶力が増進されたことを確認することができた(図2D)。
APP/PS1マウス脳のアミロイド蓄積に対するラマリンの影響を調べるために、ラマリン投与群と対照群のAβ40、Aβ42およびAβプラーク形成を分析した。ラマリン処理に対するAβプラーク蓄積は脳を免疫染色して確認した。
APP/PS1マウス脳のBACE1発現に対するラマリンの影響を調べるために、ラマリン投与群と対照群のBACE1レベルを免疫蛍光染色法およびウェスタンブロットで分析した。また、リアルタイム重合酵素連鎖反応でBACE1 mRNAレベルを分析した。
免疫蛍光染色法は、実施例4の方法と同じで、BACE1抗体(400:1,R&D system)を使用して分析した。
BACE1:forward 5’−ATGTGGAGATGACCGTAGGC−3’(配列番号1)
reverse 5’−TACACACCCTTTCGGAGGTC−3’(配列番号2)
GAPDH:forward 5’−GACATCAAGAAGGTGGTGAA−3’(配列番号3)
reverse 5’−TGTCATACCAGGAAATAGGC−3’(配列番号4)
その結果、免疫蛍光染色でラマリン投与群の脳皮質と海馬でBACE1免疫反応が減少したことを確認した(図4A)。その次に、ラマリン処理したAPP/PS1マウス脳でBACE1、C99およびC83のタンパク質発現を測定した。その結果、1ヶ月の間ラマリン処理条件でBACE1発現が顕著に減少したことを確認した(図4D)。また、ラマリン処理は、BACE1のmRNAレベルも減少させることをリアルタイム重合酵素連鎖反応分析で確認した(図4E)。
ラマリンは良く知られている抗炎症化合物で、酸化窒素生成を抑制して神経保護作用を増加させる。したがって、酸化窒素生成を介してラマリンの抗炎症効果およびADモデルであるAPP/PS1マウスでラマリンの神経炎症に対する効果を確認した。
HT−22海馬細胞とBV−2微細神経膠細胞は、10% FBSおよび1% pen/strep(Gibco,USA)が含まれたDMEM(Hyclone,USA)で37℃でCO2培養器で培養した。ラマリンは0.1%(v/v)の濃度で蒸溜水に溶かして使用して、すべての実験の細胞はLPS(1μg/ml)が存在するか、存在しない無血清DMEM培地に各濃度のラマリンを処理して培養した。
図8に示された通り、BV−2微細神経膠細胞に1μg/ml LPS処理は、p38、JNK、ERK MAPKおよびNF−κB p65を対照群と比較して503.7%、99%、58%および89%の割合で速くリン酸化させるのに対して、10および100μg/mlラマリン処理は、NF−κBを41.67%および131%減少させて、100μg/mlラマリン処理はp38、JNKおよびERK MAPKのリン酸化を516.5%、116%および42%減少させて、LPSを処理した微細神経膠細胞でラマリンが増加するNF−κB(リン酸化されたp65)を減少させて、LPSが処理された微細神経膠細胞で活性化するストレスキナーゼ(p38、JNK、ERK)がラマリン処理によって抑制されることが明らかにされた(図9)。
Claims (4)
- 下記式Iで表されるラマリンを有効成分として含有するアルツハイマー病の治療または予防用薬学組成物。
- 前記ラマリンは、BACE1およびNALPインフラマソームタンパク質の発現を抑制することを特徴とする請求項1に記載の薬学組成物。
- 薬学的に許容される担体、賦形剤または希釈剤をさらに含むことを特徴とする請求項1に記載の薬学組成物。
- 下記式Iで表されるラマリンを有効成分として含有するアルツハイマー病の予防または改善用食品組成物。
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