JP6550333B2 - ペプチドに誘導されたタンパク質ノックダウン - Google Patents
ペプチドに誘導されたタンパク質ノックダウン Download PDFInfo
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- JP6550333B2 JP6550333B2 JP2015533387A JP2015533387A JP6550333B2 JP 6550333 B2 JP6550333 B2 JP 6550333B2 JP 2015533387 A JP2015533387 A JP 2015533387A JP 2015533387 A JP2015533387 A JP 2015533387A JP 6550333 B2 JP6550333 B2 JP 6550333B2
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- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
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Description
本発明は、分子細胞生物学分野に属し、細胞でのタンパク質発現の調節に用いられ得る組換え核酸とタンパク質のコンストラクトに関する。特に、本発明の態様は、分解のため標的タンパク質をリソソームに誘導するコンストラクトを用いた内在性の細胞タンパク質のペプチドに仲介されたノックダウンに関する。
内在性タンパク質の発現レベルを変化させるための迅速かつ可逆的な方法は、複雑な生物学的システムを研究するための不可欠なツールとなるだけでなく、多くの疾患の治療のための新しい治療法の開発を潜在的に駆り立て得る。DNA又はmRNAを標的とすることによって、タンパク質の発現と機能を操作する技術は強力なツールであると判明しているが、しかし特異性、スピード、可逆性、及び同調性の欠失といった問題にしばしば悩まされる1。その上、人間の疾患の治療でのそれらの治療上の使用は効率的な全身の送達システムの欠失よって妨害される場合がある2。
一態様において、本発明は内在性のリソソーム依存の自食作用系、すなわちシャペロン介在性オートファジー(chaperone-mediated autophagy)(CMA)(図1a)を利用することによって、非遺伝的に修飾された、ネイティブタンパク質の迅速かつ可逆的なノックダウンを引き起こすことができる、ペプチドを基にした系に関する。CMAは、分子ごとを基礎とする、基質タンパク質の選択的な取込みを起こす自食作用の型である。この特異性は、いくつかの例が、ペンタペプチドモチーフKFERQに関する場合のある、CMAターゲティングシグナル(CMA-targeting signal)(CTS)によって実現されている。CTSはCMAの誘発に必要であり、そして今までCMAのすべての基質タンパク質で見つかっている。標的とされたタンパク質の分解を目的とし、CMAを利用するため、本発明のペプチドは、標的タンパク質を特異的に認識し結合できる、タンパク質結合ドメイン(protein binding domain)を含むが、これは分解のためにリソソームの内部に、ペプチド−タンパク質複合体を送達することができる、CTSが融合されている。本発明の前記ペプチドは、細胞膜を横切ってペプチドを送達することができる、細胞膜透過ドメイン(cell membrane penetrating domain)(CMPD)をさらに含んでいてもよい(実施例を図1に示した)。CMPDは、HIV-1 Tatタンパク質、GRKKRRQRRRPPQ; Drosophila melanogasterアンテナペディアドメイン(Antennapedia domain) Antp (アミノ酸 43-58), RQIKWFQNRRMKWKK; Buforin II, TRSSRAGLQFPVGRVHRLLRK; hClock-(アミノ酸 35-47) (ヒトClockタンパク質DNA結合ペプチド), KRVSRNKSEKKRR; MAP (モデル両親媒性ペプチド(model amphipathic peptide)), KLALKLALKALKAALKLA; K-FGF, AAVALLPAVLLALLAP; Ku70に由来したペプチドであって、VPMLKE、VPMLK、PMLKE又はPMLKを含む群から選択されたペプチドを含むペプチド; プリオン, Mouse Prpe (アミノ酸 1-28), MANLGYWLLALFVTMWTDVGLCKKRPKP; pVEC, LLIILRRRIRKQAHAHSK; Pep-I, KETWWETWWTEWSQPKKKRKV; SynBl, RGGRLSYSRRRFSTSTGR; トランスポータン(Transportan), GWTLNSAGYLLGKINLKALAALAKKIL; トランスポータン-10, AGYLLGKINLKALAALAKKIL; CADY, Ac-GLWRALWRLLRSLWRLLWRA-システアミド(cysteamide); Pep-7, SDLWEMMMVSLACQY; HN-l, TSPLNIHNGQKL; VT5, DPKGDPKGVTVTVTVTVTGKGDPKPD; pISL, RVIRVWFQNKRCKDKK又は他の知られた任意のCMPDのタンパク質形質導入ドメインであり得る。
「ノックダウン」という語は本明細書で用いられる場合、細胞におけるタンパク質の発現レベルの減少をさすために用いられる。従って、「ノックダウン」は、「タンパク質のレベルの減少(reduction of the levels of the protein)」、「タンパク質の発現レベルの減少(reduction in the expression level of a protein)」、「タンパク質の細胞内発現レベルの減少(reduction of the intracellular expression level of a protein)」という言い回し又はこれらの言い回しの任意のバリエーションと同じ意味で使われ得る。
材料及び方法
抗GFP抗体(Clontech, 632381)、抗α-シヌクレイン抗体(BD Transduction Laboratories, 610786)、モノクローナル抗FLAG M2抗体(Sigma-Aldrich, F1804-200UG)、抗DAPK1抗体(Sigma, D1319-200UL)、モノクローナル抗リン酸化DAPK1抗体(pSer308, Sigma, D4941)、抗NR2B抗体(研究室で作成)、抗HA抗体(Roche applied science, 11867431001)、抗lamp1抗体(Abcam, ab13523)、抗GAPDH抗体(Abcam, ab9485)、抗アクチン抗体(Abcam, ab8227)、抗lamp2a抗体(Abcam, ab18528)、抗Labmin B1抗体(Abcam, ab16048)、抗HSP90抗体(BD Transduction Laboratories, 610418)、抗VDAC1(Porin)抗体(MitoSciences,MSA03)。抗体は、それらの意図する目的(免疫ブロット、免疫細胞化学、免疫組織化学及び共免疫沈降)のために、メーカーの製品説明書及び/又は研究室の方法に従って、検証された。塩化アンモニウム(Sigma, A0171)、3-メチルアデニン(Sigma, M9281)、MG132(Sigma, C2211)、ペプスタチンA (Sigma)、N-メチル-D-アルパラギン酸(NMDA, Tocris Asc-052)、H2O2(Sigma, 7722-84-1)、カタラーゼ(Sigma, C1345)、(2R)-amino-5-phosphonopentanoic acid(APV, Ascent Scientific, Asc-003)。TAT-NR2B-CTS及びTAT-NR2BはGL Biochem及びUBC内のBrain Research Centerペプチド合成施設により合成された。
CTS-GFPはCTSコード配列を含むBamHI断片をpEGFP-N2ベクター(Clontech #6081-1)に導入することで構築した。CTSコード配列は特注設計のオリゴヌクレオチド(Integrated DNA Technologies)のアニーリングにより調製した。mCTS-GFPはCTS-GFPプラスミドに対する1点変異を行うことにより構築した。FLAG-βsyn36はオリゴヌクレオチドのアニーリング及びHindIII及びNotI制限酵素部位(HindIII, Fermentas, FD0504; NotI Fermentas , FD0594)を使ったpcDNA3.0への挿入により構築した。FLAG-βsyn36-CTSはFLAG-βsyn36を鋳型として用い、CTSコード配列を逆方向プライマーに加えたPCRにより構築した。FLAG-cDAPK1はWT-DAPK1(789-936bp)から自己阻害ドメインを欠失することにより調製した。NR2Bct(1242-1342aa)はNR2B発現ベクターを用いたPCRにより調製した。NR2Bct-CTS断片は、EcoRI及びBglII制限酵素部位(EcoRI, Fermentas, FD0274; BglII, Fermentas, FD0084)を用いたNR2Bct断片のCTS-GFPへの挿入により入手し、次いでPCRにより断片にNcoI及びEcoRIを導入した(NcoI, Fermentas, FD0574)。His-TAT-NR2Bct-CTSはNcoI 及び EcoRI制限酵素部位を用いたNR2Bct-CTSのpTAT/pTAT-HAプラスミドへのクローニングにより構築した(S. Dowdy, Washington University, St. Louis, MOのすばらしい贈り物による31)。His-TAT-NR2BctはCTS配列中の最初のアミノ酸をストップコドンにする変異により構築した。HA-NR2Bct-CTSはTAT-NR2Bct-CTSを鋳型とし、どちらにもBamHI部位を有する順方向及び逆方向プライマーと共にPCRを用いることにより構築し、次いでBamHI(Fermntas, FERFD0054)を用いてpcDNA3.0に挿入した。HA-NR2Bct-CTSmは点変異により構築した。
His-TAT-NR2Bct及びHis-TAT-NR2Bct-CTSプラスミドはBL21に形質転換し、アンピシリン耐性培養皿に蒔き、そして37℃で一晩インキュベートした。それぞれのプラスミド由来の単一コロニーをLB(Amp+)で再懸濁し、OD600が0.5に達するまで37℃でインキュベートした。IPTG(1mM)を加えること及び5時間のインキュベートで発現を誘発した。遠心分離及び培養液を廃棄することで次いでペレットを回収した。ペレットを超音波処理及び遠心分離し、精製した。Hisペプチドはメーカーのプロトコール(Thermo Scientific, 88223)に従い精製した。簡潔には、Ni-NTA樹脂カラムを平衡にし、次いで調製したペプチド抽出物をカラムに加えた。カラムを洗浄し、次いで溶出緩衝液を用いて溶出した。精製したペプチドは次いでクーマシー染色を用いて純度をモニターし、そしてペプチド濃度を280nmにおける吸光度により測定した。
HEK293細胞及びCOS7細胞を、10%ウシ胎仔血清(Invitrogen, 12483020)を補充したDMEM(Sigma, D6429-24X500ML)中で培養した。細胞は6ウェルプレート中に80%コンフルエンスまで増殖させ、メーカーのプロトコールに従って、リポフェクタミン2000(Invitrogen, 11668019)を用いて一過性の遺伝子導入をした。細胞を37℃で24時間又は48時間遺伝子導入し、その後生化学的分析のために回収した。TAT又はHis-TATペプチドを含む実験においては、特段の定めのない限り、ペプチドをNMDA刺激の1時間前に添加した。
ラット皮質神経細胞の解離培養は、以前説明したとおり35、受精後18日で安楽死させた母親から回収したSprague Dawley系のラットの胎仔から調製した。簡潔には、海馬及び大脳皮質を胎仔から抽出し、0.25%トリプシン-EDTA中で30分インキュベートした。消化された組織を粉砕により解離し、ポリ-D-リジンでコートした(Sigma, P7280)プレート上に蒔いた。プレーティング培地はB27(Invitrogen, 17504044)、グルタミン酸(Sigma, G8415)及びGlutaMax (Invitrogen, 35050-061)を補充したNeurobasal培地(Invitrogen, 21103-049)から成っていた。2日後、培地の2/3を、Neurobasal培地B27及びGlutaMaxから成る新鮮なNeurobasalフィーディング培地で置換した。培養は加湿された5% CO2雰囲気中で37℃に維持した。成熟神経細胞(in vitroで14-18日(DIV))を実験に用いた。
免疫ブロットアッセイは以前説明したとおり36行なった。簡潔には、150 mM NaCl、50 mM トリスpH7.4、0.1% SDS、1% NP-40、0.5% デオキシコール酸ナトリウム、1 mM EDTA、1 mM Na3VO4、及びタンパク質分解酵素阻害剤混合液(Thermo Fisher, PI78442) で構成される溶解緩衝液を用いて、タンパク質を神経細胞から抽出した。試料を10% SDS-PAGEゲルで分離し、フッ化ポリビニリデン(PVDF)メンブレンに転写し、そしてそれぞれの抗体を用いて免疫ブロットした。ブロットは化学発光検出試薬キット(Fisher, 32106)で増強し、Bio-Rad imager and Quantity One softwareを用いて可視化した。それぞれのバンドからのシグナルの強度をBio-Rad Image Lab softwareを用いて定量化し、同じメンブレン及び実験からのそれらのコントロールと比較してバンドを分析した。
共免疫沈降(Co-IP)アッセイは、以前の説明37をわずかに変更して行った。皮質神経細胞培養物は氷冷したSDAのない溶解緩衝液中で溶解した。抽出物(0.5mg)は10μlタンパク質Aセファロースビーズ(GE Life Sciences, 17-0780-01)を用いて1時間事前除去し、次いで非特異的なIgG (4μg)、ポリクローナルの抗NR2B抗体(ラボ, 4μg)と共に4℃で一晩インキュベートし、その後3時間4℃で60ulのプロテインAセファロースビーズ(Sigma)を添加した。試料は溶解緩衝液で2回洗浄し、無菌のPBSで2回洗浄し、SDS試料緩衝液で変性させた。SDS-PAGE及び免疫ブロットは上記したとおに、引き続き行った。
免疫細胞化学は以前説明したとおり37行った。COS細胞を氷冷したPBSで洗浄し、次いで事前に温めた4% PFA/PBS溶液中で、37℃,60分間で固定し、0.1%トリトンX-100中で5分間透過処理し、PBS中で、5%ウシ胎仔血清(FBS)を用いて30分間37℃でブロックしたが、それぞれのステップ間では大規模にPBSで洗浄した。一次抗体を3%FBS中で希釈した。細胞は抗lamp1a抗体(1:50)と共に24-48時間4℃でインキュベートし、次いでPBSで6×2分間洗浄した。二次抗体Alexa555を3% FBS/PBSで1:1000に希釈し、30分間37℃でインキュベートし、次いで大規模に洗浄した。ProLong Gold medium (Invitrogen, P36930)中でスライドにマウントする前に、核をDAPI(1:5000, 10分間 室温)で染色した。取込み画像は共焦点顕微鏡(Leica DMIRE2 & CTRMIC)から入手した。それぞれの画像をシグナル:ノイズの割合が最大になるように調整した。
細胞質/核分画は培養皮質神経細胞(6.0*106細胞/100分間 ディッシュ)で行った。簡潔には、細胞を氷冷したPBSで洗浄し、30分間溶解緩衝液中で揺り動かした。次いで細胞を回収し、粗い細胞質及び核画分を入手するために遠心分離をした。上清を回収し、精製細胞質画分を得るためにさらに遠心分離をした。元のペレットは核溶解物を得るため洗浄し、ボルテックスした。ミトコンドリア分画はPierce Mitochondria Isolation Kit for Cultured Cells (Thermo Scientific, 89874)のユーザーガイドの記載により行った。精製度はLB1(核のみ)、HSP90 (細胞質のみ)、及びVDAC1(ミトコンドリアのみ)の存在について免疫ブロットにより評価した。
一次神経細胞培養物の細胞毒性の障害は、以前記述したとおり38培地へ放出されたLDHを測定することで評価した。皮質神経細胞は、His-TAT-NR2Bct-CTS、コントロールペプチドのHis-TAT-NR2Bct(50μM, 1時間 前処理及び実験の間中)、APV(1mM, 30分間 前処理及び実験の間中)又はカタラーゼ(100U, 15 分間前処理及び実験の間中)の存在及び非存在下において、H2O2で誘導された興奮毒性 (300 μMで30分間)にさらし、培地をLHD酵素活性のため刺激後12時間で回収した。ペプチド毒性は神経細胞を24時間、25μM合成ペプチド又は200μM組換えペプチドで処理することにより評価した。培地をLDHアッセイのため回収した。ポジティブコントロールを、培地回収の前に細胞を100% Trixton X-100で溶解することで入手した。培地中のLDHの量は、メーカーの説明に従って、LDH細胞毒性検出キット(Sigma, TOX7)を用いて定量した。490 nmでの吸光度はマイクロプレート読み取り装置(μQuant, Bio-TEK instruments)を用いて定量したが、この際バックグランドでの読み取りを差し引くことで調整した。
全ての動物実験は動物ザ ユニバーシティ オブ ブリティッシュ コロンビア動物実験委員会の承認されたプロトコールに従って行った。大人の無処理の雄Sprague-Dawley系のラット(300-350g, Charles River)を12時間:12時間明暗周期下で集団収容(3-4動物/ケージ)し、手術前はラットのペレット食及び水を自由にとれるようにした。縫合・挿入方法を用いた可逆的なMCAOは以前説明したとおり37行った。簡潔には、右中大脳動脈を閉塞するまで、先端を鈍らせたナイロン縫合糸を、麻酔をかけたラットの右外頚動脈を通じて進入させ、右内頚動脈まで進めた。60分間の閉塞後、閉塞除去を促進するためラットを再び麻酔した。外科手術を通して、加温パッドを用いて体温を36.5から37.5℃の間に維持した。ペプチド(10 mg/kg)又はビヒクルコントロール(生理食塩水; 1 ml/kg)を頸静脈経由で注入した。次いでラットを縫合し、組織採取まで回復させた。
ラットを麻酔し、2重にろ過した生理食塩水及び4%パラホルムアルデヒド(PFA)を含むPBSで灌流した。脳を回収し、4% PFAで浸し、その後30%ショ糖/PBSで低温保護をした。脳が沈んだ後、ドライアイスで急速冷凍し、その後-80℃で一晩凍らせた。次いでクリオスタットを用いて、それを30μmスライスし、0.1M PB(第二りん酸ナトリウム及び第一りん酸ナトリウム)中で保存した。染色の前に、切片を0.1M PB で3x10分間洗浄し、透過処理及び1%BSA及び0.2% トリトンX-100を含む0.1M PBで30分間ブロックし、抗DAPK1抗体(1:100)を用いて4℃で3日間染色をした。その後それらを洗浄し、Alexa 488 (1:1000)を用いて4℃で一晩染色し、次いで洗浄及びマウントした。
染色前に、切片をスライドグラス上にマウント及び乾燥した。切片は光を遠ざけて15分間ヘマトキシリン溶液 (Sigma, MHS1-100ML)中に浸し、その後5分間水道水で青色付をした。次いでスライドを0.5%エオシンY(Sigma, E4009-5G)で後染色し、エオシンの筋がつくのが止まるまでddH2O中に浸した。次いでEtOH (50%, 70%, 95% 及び 100%)で脱水し、キシレンで2回透徹した。Permount (Fischer Scientific, SP15-500)をカバーグラスとして用いた。
データは平均値±平均値の標準誤差として表した。定量化は少なくとも3つの独立した実験を用いて行った。統計学的有意性は* 又は Δを P < 0.05、 ** 又はΔΔをP < 0.01、***又はΔΔΔをp<0.001として定義した。ANOVA (フィッシャーLSD法)を別段の定めがない限り用いた。一元配置分散分析法(FフィッシャーLSD法)を特段の定めがない限り用い、ANOVA分析を行う前に、データを正規性(シャピロ-ウィルク検定、検定力 0.05)、及び等分散(検定力 0.05)について検定した。
図1aで図示したように、我々は細胞膜透過ドメイン(CMPD)、標的タンパク質に対する特異性を持つタンパク質結合ドメイン(PBD)、及びCMAターゲティングシグナル(CTS)又はCMAターゲティングモチーフ(CTM)を含むターゲティングペプチドを設計した。本明細書で用いられたように、代表的なペプチドにおける「CTS」及び「CTM」は互換的に用いられる。本発明のターゲティングペプチド(図1aに図示)はin vitro又はin vivoにおける細胞環境に対して投与され、前記ターゲティングペプチドは自身のCMPDを経由して細胞に侵入するが、そこでPBDを経由して自身の標的タンパク質と安定した複合体を形成し、そして自身のCTSと細胞質のヒートショックシャペロン(heat shock chaperone)(hsc)70及び様々なコシャペロン(co-chaperones)8との間の相互作用を通じ、CMAで仲介されるタンパク質分解を経由した急速なノックダウンのため、標的タンパク質をリソソーム区画へ送達する。
HEK細胞を用いて、我々は、CTSのアミノ末端に緑色蛍光タンパク質(GFP)を融合することで(CTS-GFP)、CTSは効率的にCTSを含むタンパク質を分解のためリソソームへ誘導できることを示した。ターゲティングの効率を向上させるため、我々は同時に、3つの異なるCMA基質タンパク質―Rnase A(KFERQ)9、hsc70(QKILD)10及びヘモグロビン(QRFFE)11から同定した3つの異なるCMAターゲティングシグナルをGFPで標識をした(図1b)。次いで我々は、コントロールとしてCTSで非標識の野生型GFPコンストラクト(WT-GFP)と共に、CTS-GFPコンストラクトをHEK又はCOS-7細胞に一過的に発現させた。図1cに示したように、共免疫蛍光の染色により、WT-GFPは核を含む細胞の区画のほとんどで散在的に発現していたが、CTS-GFPは主にリソソーム区画に誘導されていたことが明らかとなったが、これはリソソームのマーカータンパク質lamp1aとの広い範囲の共局在により証明された。CTS-GFPをリソソーム分解に誘導するCTSの能力と一致して、免疫ブロット分析によりCTS-GFPタンパク質レベルは時間依存的な態様により減少したことが明らかになり、遺伝子導入後24時間でWT-GFPのレベルは47.97% ±5.66% (平均値±平均値の標準誤差)減少した(補足図1)。
リソソーム分解のためにCTSで融合したタンパク質のターゲティングにおけるCTSの能力と特異性が確証されたので、我々はCTS及び標的タンパク質への結合ドメインから構成される短いペプチドを用いて、非CMAタンパク質基質がCMAを介したリソソーム分解のために間接的に標識されることの実証を進めた。
培養された皮質神経細胞は、一次細胞でin situにおいて、内在性のタンパク質であるDAPK1の発現レベルを効率的に減少するという、本発明のペプチドに仲介されたシステムの代表的な実施形態の使用を説明するのに用いた。
我々は、本発明の標的とされたペプチドに仲介されたDAPK1分解系の成功の確認に続き、2つの別のタンパク質α-シヌクレイン及びシナプス後肥厚タンパク質95(PSD95)のリソソームターゲティング及び分解を仲介する、CTSを含むペプチドの能力を例証することで、我々の方法の一般化可能性を示した。
従って、上記の結果は、目的のタンパク質に対する特異的なタンパク質結合ドメイン及びCTSを含むターゲティングペプチドは、目的のタンパク質の分解を引き起こすことができること、及びこの系は様々なネイティブタンパク質の分解に用いることができることを実証している。下記のように、このペプチドに仲介されたネイティブタンパク質レベルの減少は生理的に及び/又は病理学的に関する表現型である。
上記の実験及び結果において、新規のターゲティングペプチドを基にした方法は、細胞内のネイティブタンパク質の発現レベルを減少させることを実証した。この方法は、頑強な、可逆的な、用量及び時間依存的な、及び条件的なネイティブタンパク質の分解を提供する。小さな(19kDa, α-シヌクレイン)、及び大きな(160kDa, DAPK1)両方の細胞質タンパク質、及びシナプスの足場となるタンパク質PSD95の効率的なノックダウンは、このターゲティングペプチドを基にした方法の可能性及び多用途性をさらに実証しており、結合パートナー及び結合ドメイン配列が知られた、又は入手され得る複数の異なった内在性の細胞質タンパク質の発現レベルを効率的に調整するのに使用することについての構想の実証証拠を提供する。例えば、この方法は異なる細胞質タンパク質キナーゼの発現レベルを調整することにおいて、特に多用途である場合がある。
配列番号1 (TAT PTDを有さない、α-シヌクレインをターゲティングする対象のノックダウンペプチド。CMAターゲティングシグナル(CTS)に下線が引かれている。): GVLYVGSKTRKFERQKILDQRFFE
配列番号2 (TAT PTD(イタリック)を有する、α-シヌクレインをターゲティングする対象のノックダウンペプチド。CMAターゲティングシグナル(CTS)に下線が引かれている。):
配列番号3 (TAT PTDを有さない、DAPK1をターゲティングする対象のノックダウンペプチド。CMAターゲティングシグナル(CTS)に下線が引かれている。): KKNRNKLRRQHSYKFERQKILDQRFFE
配列番号4 (TAT PTD(イタリック)を有する、DAPK1をターゲティングする対象のノックダウンペプチド。CMAターゲティングシグナル(CTS)に下線が引かれている。):
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Claims (29)
- (a)シャペロン介在性オートファジー(CMA)ターゲティングシグナルドメイン;
(b)神経変性疾患、脊髄損傷、脳卒中、脳外傷、アルコール依存症、及びアルコール離脱からなる群から選択される疾患の発病に関与する標的の細胞質タンパク質に選択的に結合するタンパク質結合ドメイン;
及び
(c)細胞膜透過ドメイン:
を含むペプチドであって、前記CMAターゲティングシグナルドメインが、KFERQKILDQRFFEのアミノ酸配列を含む、ペプチド。 - 細胞膜透過ドメインのアミノ酸配列が:
HIV-1 Tatタンパク質のタンパク質形質導入ドメイン, GRKKRRQRRRPPQ;
Antp (Drosophila アンテナぺディア-(アミノ酸 43-58)), RQIKWFQNRRMKWKK;
Buforin II, TRSSRAGLQFPVGRVHRLLRK;
hClock-(アミノ酸 35-47) (ヒトClockタンパク質 DNA結合ペプチド), KRVSRNKSEKKRR;
MAP (モデル両親媒性ペプチド), KLALKLALKALKAALKLA;
K-FGF, AAVALLPAVLLALLAP;
Ku70に由来したペプチドであって、VPMLKE、VPMLK、PMLKE又はPMLKを含む群から選択されたペプチドを含むペプチド;
プリオン, Mouse Prpe(アミノ酸 1-28), MANLGYWLLALFVTMWTDVGLCKKRPKP;
pVEC, LLIILRRRIRKQAHAHSK;
Pep-I, KETWWETWWTEWSQPKKKRKV;
SynBl, RGGRLSYSRRRFSTSTGR;
トランスポータン, GWTLNSAGYLLGKINLKALAALAKKIL;
トランスポータン-l0, AGYLLGKINLKALAALAKKIL;
CADY, Ac-GLWRALWRLLRSLWRLLWRA-システアミド;
Pep-7, SDLWEMMMVSLACQY;
HN-l, TSPLNIHNGQKL;
VT5, DPKGDPKGVTVTVTVTVTGKGDPKPD;
又は
pISL, RVIRVWFQNKRCKDKK
と少なくとも90%、95%又は99%の同一性を有することを特徴とする、請求項1のペプチド。 - ペプチドが配列番号4のアミノ酸配列を含むことを特徴とする、請求項1のペプチド。
- ペプチドが配列番号4に対して少なくとも90%、95%又は99%の同一性を有するアミノ酸配列を含むことを特徴とする、請求項1のペプチド。
- 標的タンパク質が、細胞内の内在性のタンパク質であることを特徴とし、及びペプチドが、内在性標的タンパク質の細胞内発現レベルを減少させる目的のものであることを特徴とする、請求項1のペプチド。
- 標的タンパク質が、細胞質タンパク質キナーゼであることを特徴とする、請求項1のペプチド。
- 細胞質タンパク質キナーゼが、活性型であることを特徴とする、請求項6のペプチド。
- ペプチドが、動物への全身投与を目的とするものであることを特徴とする、請求項5のペプチド。
- 動物において、内在性の標的タンパク質の細胞内発現レベルを減少させるための薬剤の製造における、請求項5記載のペプチドの使用。
- 動物において、内在性の標的タンパク質の細胞内発現レベルを減少させることにおける使用のための、請求項5記載のペプチド。
- 動物の疾患を治療するため、前記動物における内在性の標的タンパク質の細胞内発現レベルを減少させるための、薬剤の製造における請求項5記載のペプチドの使用。
- 動物の疾患を治療するため、前記動物における内在性の標的タンパク質の細胞内発現レベルを減少させることにおける使用のための、請求項5記載のペプチド。
- 請求項1のペプチド及び医薬的に許容できる担体、希釈剤又は賦形剤を含む、医薬組成物。
- 医薬的に活性のある剤と共投与されることを特徴とする、請求項13の医薬組成物。
- (a)シャペロン介在性オートファジー(CMA)ターゲティングシグナルドメイン;
(b)標的タンパク質に選択的に結合するタンパク質結合ドメイン;
及び
(c)細胞膜形質導入ドメイン;
を含むペプチドを含む組成物であって、前記CMAターゲティングシグナルドメインが、KFERQKILDQRFFEのアミノ酸配列を含み、それを必要とする動物において、内在性の標的タンパク質の細胞内発現レベルを減少させるための組成物。 - 標的タンパク質が、細胞質タンパク質キナーゼであることを特徴とする、請求項15の組成物。
- 細胞質タンパク質キナーゼが、活性型であることを特徴とする、請求項16の組成物。
- 細胞質タンパク質キナーゼが、細胞死関連タンパク質キナーゼ1(DAPK1)であることを特徴とする、請求項16の組成物。
- DAPK1が活性型であることを特徴とする、請求項18の組成物。
- (a)シャペロン介在性オートファジー(CMA)ターゲティングシグナルドメイン;(b)標的タンパク質に選択的に結合するタンパク質結合ドメイン;及び(c)細胞膜形質導入ドメイン:を含むペプチドであって、前記CMAターゲティングシグナルドメインが、KFERQKILDQRFFEのアミノ酸配列を含むペプチドを含む、動物における標的タンパク質の細胞内発現レベルを減少させるための組成物。
- 標的タンパク質の細胞内発現レベルの減少が、可逆的であることを特徴とする、請求項20の組成物。
- (a)シャペロン介在性オートファジー(CMA)ターゲティングシグナルドメイン;(b)内在性の標的タンパク質に選択的に結合するタンパク質結合ドメイン;及び(c)細胞膜形質導入ドメイン:を含むペプチドであって、前記CMAターゲティングシグナルドメインが、KFERQKILDQRFFEのアミノ酸配列を含むペプチドを含む、動物の病態を治療するための組成物であって、ペプチドが内在性の標的タンパク質の細胞内発現レベルを減少させることを特徴とする、組成物。
- 病態が神経変性疾患であることを特徴とする、請求項22の組成物。
- 神経変性疾患がアルツハイマー病、筋萎縮性側索硬化症(ALS)、パーキンソン病又はハンチントン病であることを特徴とする、請求項23の組成物。
- 病態が脊髄損傷、脳卒中、脳外傷、アルコール依存症又はアルコール離脱であることを特徴とする、請求項22の組成物。
- 病態が細胞死に関連する疾患であることを特徴とする、請求項22の組成物。
- ペプチドが、シャペロン介在性オートファジー(CMA)分解を用いた、α-シヌクレインの細胞内発現レベルを減少させるためのものであることを特徴とする、
(a)CMAターゲティングシグナルドメイン;
(b)α-シヌクレインに選択的に結合するβ-シヌクレイン(βsyn36)のアミノ酸配列;
及び
(c)細胞膜透過ドメイン:
を含むペプチドであって、前記CMAターゲティングシグナルドメインが、KFERQKILDQRFFEのアミノ酸配列を含む、ペプチド。 - パーキンソン病の治療において使用するための、請求項27のペプチド。
- 細胞の細胞質において、ペプチドが可溶型であることを特徴とする、請求項1のペプチド。
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