JP2021534187A - 中枢神経系疾患の予防または治療用のセリン誘導体化合物 - Google Patents
中枢神経系疾患の予防または治療用のセリン誘導体化合物 Download PDFInfo
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- 238000011200 topical administration Methods 0.000 description 1
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Abstract
Description
1)4Lの反応器に2−クロロトリチルクロリドレジン(0.1mmol)とMC(メチレンクロリド)(0.4L)とを入れ、2時間かけて膨らます。
1)上記の(1)工程を完了した後、その反応器内においてFmoc−Ser(trt)−OH(1.5eq)、HOBt(1−ヒドロキシベンゾトリアゾール(1−hydroxybenzotriazole))(1.5eq)、DMF(0.3L)を溶かした後、1−[ビス(ジメチルアミノ)メチレン]−1H−ベンゾトリアゾリウム3−オキシドヘキサフルオロホスファート(1−[Bis(dimethylamino)methylene]−1H−benzotriazolium 3−Oxide Hexafluorophosphate;HBTU)(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上常温で反応させる。
1)上記の(2)工程を完了した後、その反応器内においてFmoc−Ser(trt)−OH(1.5eq)、HOBt(1.5eq)、DMF(0.3L)を溶かした後、HBTU(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上反応させる。
1)上記の(3)工程を完了した後、その反応器内においてFmoc−Lys(Boc)−OH(1.5eq)、HOBt(1.5eq)、DMF(0.3L)を溶かした後、HBTU(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上反応させる。
1)合成が完了したレジンにトリフルオロ酢酸(trifluoroacetic acid;TFA)、トリイソプロピルシラン(Triisopropylsilane;TIS)、H2Oを入れ、開裂する。
1)乾燥した粗製の製品を水に溶かし、分取液体クロマトグラフィー(Prep LC)を用いて純度90%以上のH−Lys−Ser−Ser−Ser−OHを得る。
1.材料および方法
1.1.培地および試薬
ダルベッコ改変イーグル培地(Dulbecco’s Modified’Eagle Medium;DMEM)、ウシ胎児血清(fetal bovine serum;FBS)、4−(2−ヒドロキシエチル)ピペラジン−1−エタンスルホン酸(4−(2−Hydroxyethyl)piperazine−1−ethanesulfonic acid;HEPES)とストレプトマイシン−ペニシリン(streptomycin−penicillin)などの細胞培養用の試薬は、Gibco BRL社(GrandIsland,USA)から購入した。
4Lの反応器に2−クロロトリチルクロリドレジン(0.1mmol)とMC(0.4L)とを入れ、2時間かけて膨らました。膨らまされたレジンにDMF(0.2L)中のFmoc−Ser(trt)−OH(1.5eq)とDIPEA(3eq)とを入れ、RTにおいて6時間かけて反応させ、反応が完了した後、DMF(0.2L)で洗浄した。MC/MeOH/DIPEA(255:30:15)の混合液を入れてRTにおいて2時間かけてキャッピング及び振とう反応を行った後、DMF(0.2L)で洗浄した。デブロッキング(DMF=0.3L中の20%のピペリジン)溶液を入れ、RTにおいて2時間かけて反応させ、デブロッキングを完了した後、DMF(0.2L)で3回洗浄し、かつ、MC(0.2L)で2回洗浄した。次いで、前記反応器にFmoc−Ser(trt)−OH(1.5eq)、HOBt(1.5eq)、DMF(0.3L)を溶かした後、HBTU(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上常温で反応させた。反応が完了したとき、DMF(0.2L)で洗浄し、デブロッキング(DMF=0.3L中の20%のピペリジン)溶液を入れ、RTにおいて2時間かけて反応させた後、DMF(0.2L)で3回、かつ、MC(0.2L)で2回洗浄した。次いで、その反応器にFmoc−Ser(trt)−OH(1.5eq)、HOBt(1.5eq)、DMF(0.3L)を溶かした後、HBTU(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上反応させた後、DMF(0.2L)で洗浄した。デブロッキング(DMF=0.3L中の20%のピペリジン)溶液を入れ、RTにおいて2時間かけて反応させた後、DMF(0.2L)で3回、かつ、MC(0.2L)で2回洗浄した。次いで、その反応器にFmoc−Lys(Boc)−OH(1.5eq)、HOBt(1.5eq)、DMF(0.3L)を溶かした後、HBTU(1.5eq)をDMF(0.2L)に溶かした溶液にDIPEA(2eq)を速やかに入れて反応器に入れ、6時間以上反応させた後、DMF(0.2L)で洗浄した。デブロッキング(DMF=0.3L中の20%のピペリジン)溶液を入れ、RTにおいて2時間かけて反応させた後、再びDMF(0.2L)で3回、かつ、MC(0.2L)で2回洗浄した。次いで、合成が完了したレジンにTFA、TIS、H2Oを入れて開裂した後、開裂されたレジンをガラスフィルタを介してろ過し、ろ過されたろ液をエーテルに分散させた後、遠心分離して粗製の製品を得た。最後に、乾燥した粗製の製品を水に溶かし、Prep LCを用いて純度90%以上のH−Lys−Ser−Ser−Ser−OHを得た後、精製された製品を凍結乾燥させて最終H−Lys−Ser−Ser−Ser−OHを得た。
ネズミ海馬神経細胞株由来HT−22細胞(Murine hippocampal neuronal cell line HT−22)は、ダルベッコ改変イーグル培地(Dulbecco’s Modified Eagle Medium;DMEM)にウシ胎児血清(FBS)10%と100μg/mlのゲンタマイシンとを加えた培地において37℃、5%のCO2の大気環境下で培養した。この実施例においては、細胞継代の回数が15回以下である細胞を用いた。
細胞の増殖活性は、細胞生存能力を測定するMTTアッセイで調べた。まず、海馬神経細胞由来HT−22細胞(1×104細胞)を段階別に希釈した試料溶液とともに96ウェルプレートにおいて16時間かけてインキュベーションした後、50μlのMTT(3−(4,5−ジメチルチアゾリル)2,5−ジフェニルテトラゾリウムブロミド)(3−(4,5−dimethyl thiazolyl)2,5−diphenyl tetrazolium bromide)溶液(1.1mg/ml)と混合した後、4時間かけてさらに培養した。形成されたホルマザン水晶を150μlのMTT溶液で溶解し、これをプレート読取り器を用いて540nmにおいて光学濃度(OD)を測定した。
まず、1×106細胞を2%のウシ胎児血清(FBS)を含有するリン酸緩衝食塩水(Phosphate Buffered Saline;PBS)溶液で3回水洗いした後、水洗いした細胞を70%のエタノールに懸濁し、4℃において1時間かけて固定した。固定された細胞を再び同じ溶液で2回洗浄した後、50μg/mlの濃度のRNase A溶液250μlに懸濁し、37℃において30分間処理して細胞内のリボ核酸(RNA)を除去し、50μg/mlのヨウ化プロピジウム/1.12%のクエン酸ナトリウム緩衝液(pH 8.45)溶液250μlを加えて室温で20分間細胞内のデオキシリボ核酸(DNA)を染色した。これをフローサイトメトリー(FACS Calibur)で解析して各細胞内の染色されたDNAの含量を目安にして細胞周期の分布を調べた。
L−セリン、AST−099を500mg/kgで7週齢のICRマウス(n=3)に投与した後、脳組織と血液とを採取して液体クロマトグラフィー質量分析計(LC/Ms)を用いて血液と脳とに分布するL−セリンの濃度を定量し、脳/血中の比率を求めて薬物間の血液脳関門(BBB)透過力を比較した。
2.1.新規なL−セリン誘導体の開発
L−セリンは、生体内において生合成される非必須アミノ酸であるが、低い血液脳関門(BBB)透過力を有するため、脳から十分なL−セリンの供給が行われなければ、深刻な神経発達障害の原因となる。血中のL−セリンは、中性アミノ酸輸送体ASC−1(アラニン、セリン、システイン輸送体)により選択的に輸送されるため、神経発達障害に関わる疾患の改善および治療のためのL−セリンの供給に制限が多い。したがって、L−セリンのように細胞保護活性に優れているとともに、血液脳関門(BBB)透過濃度が改善されたセリン誘導体を開発すべく、15余種類のL−セリン誘導体を開発した。開発した15種のうち、薬物動態学的な評価および細胞毒性の評価を行うことにより、本発明のセリン誘導体化合物(AST−009)を選別した。
選別された本発明のセリン誘導体化合物(AST−009)の神経細胞の増殖活性を評価するために、AST−009とともにL−セリンを対照として、細胞の増殖活性を濃度別(25〜10,000μg)に添加して比較した。その結果、図1に示すように、完全培地においては、L−セリンとAST−009との間における細胞の増殖への影響には大差がなかったものの(図1における(B))、L−セリンとグリシン欠乏培地においては、L−セリンとAST−009とが両方とも無添加に比べてHT−22細胞の増殖を活性化させた(図1における(A))。このとき、L−セリンは、処理濃度500μg/mlまで細胞の増殖を最大で125%まで活性化させたが、1mg/mlの濃度以上においてはむしろ細胞の増殖をわずかに阻害した。これに対し、AST−009は、処理濃度10,000μg/ml(=10mg/ml)まで細胞毒性なしに海馬HT−22細胞の増殖を139%まで活性化させることを確認した。
選んだ薬物(AST−009)のDMNQにより誘導される酸化的ストレス(oxidative stress)に対する細胞保護の活性をDiOC6染色法で比較したところ、図2に示すように、DMNQ(10μM)を単独で処理したときに細胞の損傷率が77.8%であったのに対し、L−セリンを0.5、1、5mg/mlの濃度で処理すれば、膜電位損失の比率が濃度依存的に保護されて59.9%、58.7%および54.5%へと修復された。これに対し、AST−009の場合、同じ処理濃度において64.3%、45.5%、および20.0%へとL−セリン処理区よりもミトコンドリア膜電位損失が低くなって細胞保護の活性が遥かに強いことが分かった。すなわち、AST−009の方がL−セリンよりも細胞増殖を活性化させるだけではなく、酸化的ストレスからの神経細胞の保護活性もまたL−セリンよりも優れていることを確認することができた。
選んだセリン誘導体AST−009の脳への移行有無をL−セリンと比較し、その結果を図3および表1に示す。図3と表1に示すように、AST−009薬物のCbrain/Cplasmaの数値は、L−セリンの4.16±2.03よりも高い6.66±1.03と示されて、血液脳関門(BBB)透過力がL−セリンよりも格段に改善された薬物であることが確認された。
Claims (9)
- 前記中枢神経系疾患は、認知障害、知的障害、小脳症、脳電症、神経発達障害、認知症、自閉症スペクトラム障害、ダウン症候群、レット症候群、脆弱X症候群、アルツハイマー病、パーキンソン病、ハンチントン病および筋萎縮性側索硬化症よりなる群から選ばれることを特徴とする請求項3に記載の薬学的組成物。
- 前記中枢神経系疾患は、認知障害、知的障害、小脳症、脳電症、神経発達障害、認知症、自閉症スペクトラム障害、ダウン症候群、レット症候群、脆弱X症候群、アルツハイマー病、パーキンソン病、ハンチントン病および筋萎縮性側索硬化症よりなる群から選ばれることを特徴とする請求項5に記載の健康機能食品。
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- 2020-01-03 EP EP20738481.9A patent/EP3822255A4/en active Pending
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CN112585154A (zh) | 2021-03-30 |
EP3822255A1 (en) | 2021-05-19 |
CN112585154B (zh) | 2024-04-09 |
JP7185813B2 (ja) | 2022-12-08 |
WO2020145584A1 (ko) | 2020-07-16 |
KR102022118B1 (ko) | 2019-09-18 |
EP3822255A4 (en) | 2022-04-06 |
US20210403419A1 (en) | 2021-12-30 |
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