JP2019533992A - 酸性αグルコシダーゼ変異体及びその使用 - Google Patents
酸性αグルコシダーゼ変異体及びその使用 Download PDFInfo
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Abstract
Description
本発明は、野生型GAAタンパク質と比較して高いレベルで発現及び分泌され、全身におけるグリコーゲンの病的蓄積の改善された修復を惹起し、これによりGAAに対する免疫寛容を誘導する、GAA変異体に関する。
本発明の態様は、配列番号1又は配列番号2のヌクレオチド配列に対して少なくとも85%の同一率を有し、機能的GAAポリペプチドをコードしている、ヌクレオチド配列を含む核酸分子に関する。配列番号1及び配列番号2は、その前駆体型の天然で野生型のhGAAポリペプチドをコードしている最適化された核酸配列である(すなわち、それはそのシグナルペプチドを含まないhGAAをコードしている)。
−シグナルペプチドをコードしている部分(別名「シグナルペプチド部分」とも呼ばれる)、及び
−上記に定義されているような機能的GAAポリペプチドをコードしている部分。
本発明は、以下の実験実施例及び添付の図面を参照することによりさらに詳述されている。これらの実施例は、説明のためだけに提供され、制限する意図はない。
GAA活性
凍結した組織試料を蒸留水中でホモジナイズした後にGAA活性を測定した。50〜100mgの組織を秤量し、ホモジナイズし、次いで、10000×gで20分間遠心分離にかけた。反応を、96ウェルプレートにおいて10μlの上清及び20μlの基質(4MUα−D−グルコシド)を用いて組み立てた。反応混合物を37℃で1時間インキュベートし、次いで、150μlの炭酸ナトリウム緩衝液(pH10.5)の添加によって停止した。標準曲線(0〜2500pmol/μlの4MU)を使用して、個々の反応混合物から放出された蛍光4MUを、449nm(発光)及び360nm(励起)でEnSpireアルファプレートリーダー(パーキンエルマー社)を使用して測定した。清澄化した上清のタンパク質濃度をBCA(サーモフィッシャーサイエンティフィック社)によって定量した。GAA活性を計算するために、放出された4MU濃度を試料のタンパク質濃度で割り、活性をnmol/時間/mg(タンパク質)として報告した。
ヒトGAA(hGAA)の分泌を増加させるために、本発明者らは、肝臓に高度に分泌されているタンパク質に由来するシグナルペプチドと、導入遺伝子の配列の最適化を組み合わせた。本発明者らは、5つの異なる構築物を比較した:
1.pAAV−LSP−sp1−hGAA:α1−ミクログロブリンエンハンサー及びチロキシン結合性グロブリンプロモーターによって構成される肝特異的プロモーター(LSP)の転写制御下にある野生型シグナルペプチド(sp1)を有するヒトGAAを発現しているプラスミド。
2.pAAV−LSP−sp2−hGAA:LSPの転写制御下にあるヒトα−1−アンチトリプシンシグナルペプチド(sp2)を有するヒトGAAを発現しているプラスミド。
3.pAAV−hAAT−sp1−hGAAco1:ヒトα−1−アンチトリプシンアポリポタンパク質E肝癌細胞制御領域エンハンサー(hAAT)プロモーターの転写制御下にある天然シグナルペプチドsp1を有する配列最適化形のhGAA(hGAAco1)を発現しているプラスミド。
4.pAAV−hAAT−sp2−hGAAco1:hAATプロモーターの転写制御下にあるα−1−アンチトリプシンシグナルペプチドsp2を有する配列最適化形のhGAA(hGAAco1)を発現しているプラスミド。
5.pAAV−hAAT−sp2−hGAAco2:hAATプロモーターの転写制御下にあるα−1−アンチトリプシンシグナルペプチドsp2を有する異なる配列最適化形のhGAA(hGAAco2)を発現しているプラスミド。
Claims (13)
- 機能的GAAポリペプチドに融合させた、ヒトα−1アンチトリプシンタンパク質のシグナルペプチド、例えば配列番号4に示されるアミノ酸配列を有するシグナルペプチドを含む、機能的キメラGAAポリペプチドをコードしている核酸分子であって、該機能的GAAポリペプチドは、配列番号1又は配列番号2のヌクレオチド配列に対して少なくとも85%の同一率、好ましくは少なくとも90%の同一率を有するヌクレオチド配列によってコードされている、該核酸分子。
- 機能的GAAポリペプチドをコードしているヌクレオチド配列が、配列番号1又は配列番号2のヌクレオチド配列を含む、請求項1記載の核酸分子。
- 好ましくはα−1−アンチトリプシンプロモーター(hAAT)、トランスサイレチンプロモーター、アルブミンプロモーター、及びチロキシン結合性グロブリン(TBG)プロモーターからなる群より選択された肝特異的プロモーターなどのプロモーターに作動可能に連結させた請求項1又は2記載の核酸分子を含む発現カセットである、該核酸分子を含む核酸構築物であって、該核酸構築物は場合によりさらに、イントロン、特にヒトβグロビンb2(すなわちHBB2)イントロン、FIXイントロン、及びニワトリβ−グロビンイントロンからなる群より選択されるイントロンを含み、該イントロンは、場合により改変されたイントロン、例えば配列番号8の改変されたHBB2イントロン、配列番号10の改変されたFIXイントロン、又は配列番号12の改変されたニワトリβ−グロビンイントロンである、該核酸構築物。
- 好ましくは、エンハンサー;イントロン;プロモーター、特に肝特異的プロモーター;キメラGAAポリペプチドをコードしている核酸分子;及びポリアデニル化シグナルをこの順序で含む、請求項3記載の核酸構築物。
- ApoE制御領域;HBB2イントロン、特に改変されたHBB2イントロン;hAATプロモーター;キメラGAAポリペプチドをコードしている核酸分子;及びウシ成長ホルモンポリアデニル化シグナルを好ましくはこの順序で含む、より特定すると、該核酸構築物は配列番号13又は配列番号14のヌクレオチド配列を含む、請求項4記載の核酸構築物。
- 特にウイルスベクター、好ましくはAAVベクター又はレトロウイルスベクター、例えばレンチウイルスベクターである、請求項1〜5のいずれか一項記載の核酸分子又は核酸構築物を含むベクター。
- 一本鎖又は二本鎖の自己相補性AAVベクター、好ましくはAAVに由来するキャプシド、例えばAAV1、AAV2、変異AAV2、AAV3、変異AAV3、AAV3B、変異AAV3B、AAV4、AAV5、AAV6、変異AAV6、AAV7、AAV8、AAV9、AAV10、例えばAAVcy10、及びAAVrh10、AAVrh74、AAVdj、AAV−Anc80、AAV−LK03、AAV2i8、及びブタAAV、例えばAAVpo4及びAAVpo6キャプシドを有するAAVベクター、又はキメラキャプシドを有するAAVベクターである、請求項6記載のベクター。
- AAVベクターが、AAV8、AAV9、AAVrh74、又はAAV2i8キャプシド、特にAAV8、AAV9、又はAAVrh74キャプシド、より特定するとAAV8キャプシドを有する、請求項7記載のベクター。
- 請求項1〜2のいずれか一項の核酸分子、請求項3〜5のいずれか一項の核酸構築物、又は請求項6〜8のいずれか一項のベクターを用いて形質転換された細胞であって、該細胞は、特に肝細胞又は筋肉細胞である、細胞。
- 請求項1又は2記載の核酸分子によってコードされるキメラGAAポリペプチド。
- 薬学的に許容される担体に、請求項1又は2の核酸分子、請求項3〜5のいずれか一項の核酸構築物、請求項6〜8のいずれか一項のベクター、請求項9記載の細胞、又は請求項10記載のキメラGAAポリペプチドを含む、医薬組成物。
- 医薬品としての使用のための、請求項1若しくは2の核酸分子、請求項3〜5のいずれか一項の核酸構築物、請求項6〜8のいずれか一項のベクター、請求項9記載の細胞、又は請求項10記載のキメラGAAポリペプチド。
- 糖原病、好ましくは糖原病I型(GSDI)(フォン・ギールケ病)、糖原病II型(GSDII)(ポンペ病)、糖原病III型(GSDIII)(コーリ病)、糖原病IV型(GSDIV)、糖原病V型(GSDV)、糖原病VI型(GSDVI)、糖原病VII型(GSDVII)、糖原病VIII型(GSDVIII)、及び心臓の致死性先天性糖原病、より特定すると糖原病I型(GSDI)、糖原病II型(GSDII)、又は糖原病III型(GSDIII)、さらにより特定すると糖原病II型(GSDII)及び糖原病III型(GSDIII)、最も特定すると糖原病II型(GSDII)を処置するための方法に使用するための、請求項1若しくは2の核酸分子、請求項3〜5のいずれか一項の核酸構築物、請求項6〜8のいずれか一項のベクター、請求項9記載の細胞、又は請求項10記載のキメラGAAポリペプチド。
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WO2019009979A1 (en) * | 2017-07-06 | 2019-01-10 | The Medical College Of Wisconsin, Inc. | NEW IN VITRO AND IN VIVO ENRICHMENT STRATEGY TARGETING CSH-DERIVED LYMPHOCYTES TRANSDUCED BY A VECTOR FOR DISEASE THERAPY |
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WO2020102645A1 (en) * | 2018-11-16 | 2020-05-22 | Asklepios Biopharmaceutical, Inc. | Therapeutic adeno-associated virus for treating pompe disease |
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