JP2022529701A - 新型の酵素組成物 - Google Patents
新型の酵素組成物 Download PDFInfo
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Abstract
Description
[0086]別の態様では、本開示がさらに、THバリアントまたはその断片、誘導体もしくは類似体をコードするポリヌクレオチドを含むポリヌクレオチド構築物を提供する。特定の実施形態では、該ポリヌクレオチド構築物がさらに、AADCまたはその誘導体をコードするポリヌクレオチドを含む。特定の実施形態では、本開示が、前記の医薬組成物または酵素組成物をコードするポリヌクレオチド構築物を提供する。
[0094]別の態様では、本開示は、前記のポリヌクレオチド構築物を含むベクターを提供する。
[0098]1)本明細書中で提供されるTHバリアント、またはその誘導体をコードするポリヌクレオチド、
[0099]2)自己切断可能なペプチドをコードするT2A配列、および
[00100]3)本明細書中で提供されるAADCバリアント、またはその誘導体をコードするポリヌクレオチド。
[00102]1)90個のアミノ酸残基のN末端欠失を有するTHをコードするポリヌクレオチド、
[00103]2)自己切断可能なペプチドをコードするT2A配列、および
[00104]3)全長AADCをコードするポリヌクレオチド。
[00121]別の態様では、本開示は、前記のベクター(例えば、プラスミドまたはウイルスベクター)でのトランスフェクションにより調製された細胞を提供する。
[00133]別の態様では、本開示は、前記のウイルス粒子、および薬学的に許容される担体を含む医薬組成物を提供する。
[00140]別の態様では、本開示は、対象において、前記のTHバリアント、医薬組成物、ヌクレオチド構築物、ベクター(例えば、プラスミドまたはウイルスベクター)、細胞、ウイルス粒子または組成物を使用して(例えば、治療有効量の投与により)神経変性疾患を治療する方法を提供する。
[00152]本開示の利点は、本開示により提供される治療方法を利用して、ドパミンの異所性合成用の酵素組成物が、細胞により放出されるドパミンの濃度を著しく上昇させ得ることであり、その濃度は、別の酵素組成物よりも著しく高い。さらに、前記の外来遺伝子を送達するためのAAVベクターの使用は、標的酵素組成物をコードするヌクレオチド構築物の、脳の線条体中での効果的な発現をもたらし、それにより、PDの疾患表現型を著しく改善する。それは、遺伝子療法での適用向けの、本開示の発現ベクターとしてのAAVを含む酵素組成物の大きな価値を示唆する。
[00155]方法および材料
[00156]1.酵素組成物を発現するAAVベクターの構築
[00157]本開示の酵素組成物を発現するポリヌクレオチドとAAVベクター(Addgene:26972)とを、エンドヌクレアーゼBamHIとEcoRIとを用いて、37℃で1時間消化して、対応する付着末端を得た。ゲル回収により精製した標的断片を、T4 DNAリガーゼを用いて16℃で一晩ライゲーションした。形質転換後に培養用に単一細菌コロニーをピッキングし、ベクタープラスミドを抽出し、配列検証に向けてサンガー法シーケンシングの対象とした。
[00159]293細胞株を、GlutaMAXならびに二重抗生物質(ペニシリンおよびストレプトマイシン)を補足したDMEM中、37℃、5%CO2で培養した。293細胞の密度が、6ウェルプレートの面積の約80%に達したら、リポソーム型トランスフェクション(リポフェクタミン3000試薬)を行った。各ウェル中の293細胞を、対応するプラスミド3μgでトランスフェクトし、続く実験に向けて48時間にわたり連続的に培養した。
[00161]293細胞の培地を吸い取った後、細胞を、温かいPBSで1回洗浄してから、PBS(1mL)中で1時間培養した。ライセートを収穫してから、3,000rpmおよび4℃で10分間遠心分離した。上清をHClO4(0.6M)と1:1の比率で混合して、HClO4の最終濃度を0.3Mとした。十分に混合したサンプルを、20,000rpm、4℃で15分間遠心分離し、上清を、ESA Coulochem III電気化学検出器(ESA Analytical)を搭載したHPLCシステムにアプライした。0.2mL/分の速度のフロー状態(flow phase)で平衡化したEclipse Plus C18逆相カラム(3.5μm、2.1×150mm)を使用してカテコールアミンを分離してから、電気化学検出を行い、特定のピークの積分によりドパミン濃度を計算した。
[00163]C57BL/6マウスの遺伝的背景の片側黒質/腹側被蓋野領域(SN/VTA)への6-OHDAの注入によりPDマウスモデルを構築した。片側SN/VTA領域において6-OHDA(8mg/mL)500nLを注入するために、定位的注入を行った。有毒試薬として、6-OHDAは、ドパミン作動性ニューロンを特異的に殺滅する。6-OHDAを、50nL/分の速度でゆっくりと注入し、AP-3.6、ML-0.5およびDV-4.3において送達した。
[00166]試験前に、PDマウスモデルの頸部にアポモルフィンを、体重で計った投与量(10mg/kg)で皮下投与した。マウスを、馴化のために直径10cmのシリンダ内に置いてから、回転試験を行った。結果は、6-OHDA病変と反対側のアポモルフィン誘発回転の1分間当たり正味回転で表し、対側回転と同側回転との間の差異を、60分間の記録時間で割って計算した。
[00168]マウスを、PBS中の4%PFAで経心的に灌流した。単離した脳を約1週間、4%PFA中で固定してから、続いて、15%ショ糖溶液および30%ショ糖溶液で脱水した。解析対象の脳領域(SN/VTAおよびCP)を含有する厚さ40μmの脳切片を得るために、クリオスタット切片化を使用した。PBS中で洗浄後、脳切片を、室温で2時間、ブロックバッファ(PBS中の5%BSA、0.3% TritonX-100)中でインキュベートした。次いで、切片を4℃で一晩、一次抗体(抗TH)とインキュベートしてから、該一次抗体の起源に対応し、かつ発色団(吸収波長488nm)を有する二次抗体のインキュベーションを室温で2時間行った。全画像は、Olympus VS120ハイスループット蛍光イメージングシステムを用いて獲得した。
[00171]図1に示すように、N末端での90個のアミノ酸の欠失を有するTHバリアントおよび全長AADCを含む二酵素組成物を発現する組換えAAVベクターを構築した。下流遺伝子の発現は、シナプシンプロモータによって調節された。該二酵素組成物を発現するポリヌクレオチドは、(5’から3’へと)以下に示す3つの部分を含む。
[00172]1)配列番号13に記載される、N末端にHAタグが付いた、N末端で90個のアミノ酸を欠失させたTHをコードするポリヌクレオチド;
[00173]2)自己切断ペプチドをコードする、配列番号28に記載されるT2Aヌクレオチド配列;
[00174]3)配列番号21に記載される、C末端にMycタグが付いた全長AADCをコードするポリヌクレオチド。
[00179]ドパミンde novo合成に関して最も効率よい二酵素組成物を見出すために、本発明者は、前記の、N末端でのアミノ酸欠失を有するTHおよび全長AADCを含む一連の二酵素組成物をコードするベクタープラスミドをそれぞれ、リポソーム(リポフェクタミン3000試薬)を用いて293細胞株内にトランスフェクトした。陰性対照として、GFP発現ベクターも293細胞株内にトランスフェクトした。培養細胞を、37℃、5%CO2中で48時間インキュベーション後、細胞培養培地をPBSで交換した。PBS中での1時間のインキュベーション後、上清PBSおよび細胞サンプルをそれぞれ収穫した。
[00183]PDモデルを構築するために8週齢のC57BL/6マウス株を選択した。マウス標準脳アトラスに従って、片側SN/VTA領域に6-OHDA(8mg/mL)500nLの定位的注入を行った。6-OHDAは、ドパミン作動性ニューロンを特異的に殺滅する毒性薬剤である。2週間後、マウスの頸部にアポモルフィンを、体重で計った投与量(10mg/kg)で皮下注射し、次いで回転試験を行った。6-OHDA病変と反対側の回転を示した、アポモルフィン誘発性運動非対称性の表現型を有するマウスを、続く実験用に選択した。
[00187]PDマウス中でのin vivo発現用に、N末端で90個のアミノ酸を欠失させたTHおよび全長AADCを含む組成物(TH90del/AADC)を発現するベクタープラスミドを、AAV血清型9のウイルス粒子(力価:1.95×1013vg/mL)内にパッケージした。対照として、GFP発現プラスミドを、AAV粒子(GFP、力価:7.78×1012vg/mL)内にパッケージした。
Claims (32)
- 60~120個のアミノ酸残基のN末端欠失を除く、配列番号1に記載されるアミノ酸配列、または少なくとも80%の配列同一性を有するその断片、誘導体もしくは類似体を含むチロシンヒドロキシラーゼバリアント。
- 80~100個のアミノ酸残基のN末端欠失を除く、配列番号1に記載されるアミノ酸配列、または少なくとも80%の配列同一性を有するその断片、誘導体もしくは類似体を含む、請求項1に記載のチロシンヒドロキシラーゼバリアント。
- 80~90個のアミノ酸残基のN末端欠失を除く、配列番号1に記載されるアミノ酸配列、または少なくとも80%の配列同一性を有するその断片、誘導体もしくは類似体を含む、請求項2に記載のチロシンヒドロキシラーゼバリアント。
- 配列番号2に記載されるアミノ酸配列、または少なくとも80%の配列同一性を有するその断片、誘導体もしくは類似体を含む、請求項2または3に記載のチロシンヒドロキシラーゼバリアント。
- N末端またはC末端に付着したタグタンパク質をさらに含む、請求項4に記載のチロシンヒドロキシラーゼバリアント。
- 前記タグタンパク質が、HA、MycまたはFlagである、請求項5に記載のチロシンヒドロキシラーゼバリアント。
- 配列番号3に記載されるアミノ酸配列を含む、請求項1~6のいずれか1項に記載のチロシンヒドロキシラーゼバリアント。
- 請求項1~7のいずれか1項に記載のチロシンヒドロキシラーゼバリアントを含む組成物。
- 芳香族L-アミノ酸脱炭酸酵素をさらに含む、請求項8に記載の組成物。
- 前記芳香族L-アミノ酸脱炭酸酵素が、配列番号4~9のいずれかに記載されるアミノ酸配列、または少なくとも80%の配列同一性を有するその断片、誘導体もしくは類似体を含む、請求項9に記載の組成物。
- 前記芳香族L-アミノ酸脱炭酸酵素がさらに、N末端またはC末端に付着したタグタンパク質を含む、請求項10に記載の組成物。
- 前記タグタンパク質が、HA、MycまたはFlagである、請求項11に記載の組成物。
- 前記芳香族L-アミノ酸脱炭酸酵素が、配列番号10に記載されるアミノ酸配列を有する、請求項8~12のいずれか1項に記載の組成物。
- 請求項1~5のいずれか1項に記載のチロシンヒドロキシラーゼバリアントをコードする第1のポリヌクレオチドおよび/または請求項9~13のいずれか1項に定義される芳香族L-アミノ酸脱炭酸酵素をコードする第2のポリヌクレオチドを含むポリヌクレオチド構築物。
- 前記第1のポリヌクレオチドが、配列番号12もしくは13に記載されるヌクレオチド配列を有するか、または配列番号12もしくは13に対する少なくとも80%の配列同一性を有するヌクレオチド配列を有する、請求項14に記載のポリヌクレオチド構築物。
- 前記第2のポリヌクレオチドが、配列番号14~21のいずれかに記載されるヌクレオチド配列を有するか、または配列番号14~21のいずれかに対する少なくとも80%の配列同一性を有するヌクレオチド配列を有する、請求項14または15に記載のポリヌクレオチド構築物。
- 前記第1のポリヌクレオチドおよび/または前記第2のポリヌクレオチドに作動可能に連結されたプロモータをさらに含む、請求項14~16のいずれか1項に記載のポリヌクレオチド構築物。
- 前記プロモータが、ニューロン特異的プロモータを含む、請求項17に記載のポリヌクレオチド構築物。
- 請求項14~18のいずれか1項に記載のポリヌクレオチド構築物を含むベクター。
- 前記第1のポリヌクレオチドおよび前記第2のポリヌクレオチドが、1つのベクター中または異なるベクター中に構築されている、請求項19に記載のベクター。
- 前記第1のポリヌクレオチドおよび前記第2のポリヌクレオチドが、1つのベクター中に構築されており、かつ前記ベクターがさらに、前記第1のポリヌクレオチドと前記第2のポリヌクレオチドとの間に挿入された第3のポリヌクレオチドを含む、請求項20に記載のベクター。
- 前記第3のポリヌクレオチドが、自己切断可能配列および/または内部リボソーム進入部位(IRES)をコードする、請求項21に記載のベクター。
- 単純ヘルペスウイルスベクター、アデノウイルスベクターおよびアデノ随伴ウイルスベクターからなる群から選択される、請求項19~22のいずれか1項に記載のベクター。
- 請求項19~23のいずれか1項に記載のベクターを含むか、または請求項19~23のいずれか1つに記載のベクターでトランスフェクトされた宿主細胞。
- 請求項14~18のいずれか1項に記載のポリヌクレオチド構築物を含むか、または請求項14~18のいずれか1項に記載のポリヌクレオチド構築物から発現される核酸を含むウイルスゲノムを含むウイルス。
- 請求項25に記載のウイルス、および薬学的に許容される担体を含む医薬組成物。
- 対象において神経変性疾患を治療するための医薬品の製造における、請求項1~7のいずれか1項に記載のチロシンヒドロキシラーゼバリアント、請求項8~13のいずれか1項に記載の組成物、請求項14~18のいずれか1項に記載のポリヌクレオチド構築物、請求項19~23のいずれか1項に記載のベクター、請求項24に記載の宿主細胞、請求項25に記載のウイルス、または請求項26に記載の医薬組成物の使用。
- 前記神経変性疾患がパーキンソン病である、請求項27に記載の使用。
- 前記対象が、哺乳類、好ましくはヒト、ラットまたはマウスである、請求項27または28に記載の使用。
- 治療を必要とする対象において神経変性疾患を治療する方法であって、請求項1~7のいずれか1項に記載のチロシンヒドロキシラーゼバリアント、請求項8~13のいずれか1項に記載の組成物、請求項14~18のいずれか1項に記載のポリヌクレオチド構築物、請求項19~23のいずれか1項に記載のベクター、請求項25に記載のウイルス、または請求項26に記載の医薬組成物の治療有効量を前記対象に投与する工程を含む方法。
- 前記神経変性疾患がパーキンソン病である、請求項30に記載の方法。
- 前記対象が、哺乳類、好ましくはヒト、ラットまたはマウスである、請求項30または31に記載の方法。
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