JP6760964B2 - 異常ヘモグロビン症の予防及び治療のためのウイルスベクター - Google Patents
異常ヘモグロビン症の予防及び治療のためのウイルスベクター Download PDFInfo
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Description
しかしながら、ヘモグロビンレベルは、しばしば経時的に減少し、脾腫が現れ、患者は増加した消化管鉄吸収に起因する進行性の鉄過剰症を患う。現在の疾病管理には、出生前診断、輸血療法、鉄キレート化及び同種骨髄移植(BMT)が含まれるが、BMTは、適合する骨髄ドナーを見つける必要があるという制限を受け、多くのリスクと合併症を伴う。βサラセミア又はクーリー貧血は、社会一般だけでなく、それを発症した人の生命に深刻な影響を与える。それゆえ、これらの患者に治療を提供する有望な遺伝子治療アプローチは非常に意義がある。この関連で、クーリー貧血をもたらす変異は、ベータ0(例えば、ベータ0-39)に分類されるか(単一点突然変異が終始コドンを作り、βグロビンタンパク質が生成されない)、又はベータ+(例えば、ベータ+-IVS1-110)に分類されることができる(第一イントロン内の変異が、選択的スプライシング及び不十分なβグロビン鎖合成をもたらす) (Musallam, K.M.等 Non-transfusion-dependent thalassemias. Haematologica 98, 833-844 (2013); Rivella, S. The role of ineffective erythropoiesis in non-transfusion-dependent thalassemia. Blood reviews 26 Suppl 1, S12-15 (2012); Ginzburg, Y. & Rivella, S. beta-thalassemia: a model for elucidating the dynamic regulation of ineffective erythropoiesis and iron metabolism. Blood 118, 4321-4330 (2011))。
従前の研究は、レンチウイルス-媒介性βグロビン遺伝子導入によって、マウスモデルでβサラセミアを救うことができることを示した(May, C.等 Successful treatment of murine beta-thalassemia intermedia by transfer of the human beta-globin gene. Blood 99, 1902-1908. (2002); May, C.等 Therapeutic hemoglobin synthesis in beta-thalassaemic mice expressing lentivirus-encoded human beta-globin. Nature 406, 82-86 (2000); Rivella, S.等 A novel murine model of Cooley anemia and its rescue by lentiviral-mediated human beta-globin gene transfer. Blood 101, 2932-2939 (2003))。
しかしながら、これらの動物は、マウスβグロビン遺伝子の完全欠失を特徴とする。さらなる異常ヘモグロビン症は、鎌状赤血球貧血及び/又はβサラセミアに類似したさらなる異常βグロビン鎖及び病態生理学的後遺症をもたらすβグロビン遺伝子の変異を特徴とする。それゆえ、異常ヘモグロビン症を治療するための改良された組成物及び方法に対する、継続した満たされていない要求が存在する。本開示は、この要求に関する。
[表1]
(上段)ヒトSCD CD-34+細胞の増殖、分化、及びpCL-ZF-Ldb1及び/又はHbF薬理学的誘導剤を用いた処理の実験フロー (下段)本研究で使用したHbF誘導剤の種類、生物活性及び用量
[表2]
ヒトSCD CD-34+細胞の増殖、分化、及びpCL-ZF-Ldb1又はHbF薬理学的誘導剤を用いた処理の実験フロー
細胞の数(1×105)×希釈係数(1 mL/μL ウイルス標本)×VCN(リアルタイムPCRにより測定、WPREエレメント及びID遺伝子のためのオリゴを使用、PCR及びReal Time PCR参照)。
β: Fw: 5′-CAAGAAAGTGCTCGGTGCCT-3′(配列番号6); Rev: 5′-GCAAAGGTGCCCTTGAGGT-3′(配列番号7); 5′-FAM-TAGTGATGGCCTGGCTCACCTGGAC-TAMRA-3′(配列番号8); α: Fw: 5′-TCCCCACCACCAAGACCTAC-3′(配列番号9); Rev: 5′-CCTTAACCTGGGCAGAGCC-3′(配列番号10); 5′-FAM-TCCCGCACTTCGACCTGAGCCA-TAMRA-3′(配列番号11); γ: Fw: 5′-TGGCAAGAAGGTGCTGACTTC-3′(配列番号12); Rev: 5′-TCACTCAGCTGGGCAAAGG(配列番号13); 5′-FAM-TGG GAGATGCCATAAAGCACCTGG-TAMRA-3′(配列番号14); BCL11A: Fw: 5′-TGATGTGTGTCCATTGGTGTGAGC-3′(配列番号15); Rev: 5′-TGCGAACTTGAACGTCAGGAGTCT, SOX-6(配列番号16): Fw: 5′-AGCTGCTTTCGGCTTTCTCCCTTA-3′(配列番号17); Rev: 5′-CCTTTGCATTTGCAGCAGTTCAGC-3′(配列番号18); C-MYB: Fw: 5′-TCAACCGATCATCCCTCACACTCT-3′(配列番号19); Rev: 5′-AATCAGCAGCGCTTCCATTCAAGG-3′(配列番号20), KLF-1: Fw: 5′-GCTGCCTCCACCCAAGTG-3′(配列番号21); Rev: 5′-ACCAACTCTGGGCAGTCACAT-3’(配列番号22), Kell: Fw: 5′-AGCAACCACCCATGCCTGCC-3′(配列番号23); Rev: 5′-CTCGGGCCAAAGGCCTCACG-3′(配列番号24).
参照遺伝子のリアルタイムPCRのために、我々は内在性コントロールとして、ヒトグリセルアルデヒド-3-リン酸脱水素酵素(GAPDH)キットを使用した(キットにおいて、プローブはVICで蛍光標識されている(Applied Biosystems))。組込み数(VCN)は、oligos(Fw: 5′-CGGCTGTTGGGCACTGA-3′(配列番号25); Rev: 5′-GGAAGGTCCGCTGGATTGA-3′(配列番号26))及びプローブ(5′-FAM-ATGGCTGCTCGCCTGTGTTGCC-TAMRA-3′(配列番号:27))を使用するQ-PCRで、ベクターに存在する特定配列(WPRE)について定量化し、それをゲノム(ID-1 Fw: 5′-AAGGTGAGCAAGGTGGAGATTC-3′(配列番号28); Rev: 5′-TTCCGAGTTCAGCTCCAACTG-3′(配列番号29))内の2コピーに存在する内在性コントロールと比較した。
細胞の数(1×105)×希釈係数(1 mL/μL ウイルス標本)×VCN(リアルタイムPCRにより測定、Psiエレメント及びID遺伝子のためのオリゴを使用、Real Time PCRより)。
Claims (15)
- i)5’末端反復配列(LTR)及び自己不活型3’LTR;
ii)少なくとも1つのポリアデニル化シグナル;
iii)少なくとも1つのプロモーター;
iv)グロビン遺伝子の遺伝子座調節領域(LCR);
v)アンキリン・インスレーター配列(Ank);
vi)ウッドチャック後調節エレメント(WPRE)、ここで、当該WPREは、前記自己不活型3’LTRの後に存在する;及び、
vii)βT87Q変異を含む改変ヒトβグロビン(B-グロビンM)をコードする配列に逆相補的な配列であって、ここで、B-グロビンMをコードする配列は、当該B-グロビンM配列のエクソン1とエクソン2の間に第一イントロン(イントロン1)、及びエクソン2とエクソン3の間に第二イントロン(イントロン2)を含み、イントロン2は、ヒトB-グロビンMイントロン2配列のヌクレオチドを476より多く含む;
を含むポリヌクレオチド。 - 請求項1に記載のポリヌクレオチドを含むレンチウイルス・ベクター。
- さらに、Ldb1転写因子及びγ-グロビンプロモーターに特異的に結合する亜鉛フィンガー(ZF)ドメインの融合物をコードする配列を含む、請求項1に記載のポリヌクレオチド。
- さらに、トランスフェリン受容体1をコードするmRNAに逆相補性を有するRNAポリヌクレオチドをコードする配列を含み、ここで、前記RNAポリヌクレオチドは、ミクロRNA又はshRNA配列を含み、RNAi-介在プロセスにおいて、トランスフェリン受容体1mRNAを減少させる能力を有する、請求項1に記載のポリヌクレオチド。
- 前記イントロン2が、完全長の成人ヒトB-グロビンMイントロン2配列を含む、請求項1に記載のポリヌクレオチド。
- 異常ヘモグロビン症の治療用である、請求項1に記載のポリヌクレオチド。
- 前記異常ヘモグロビン症が、鎌状赤血球貧血(SCA)又はβ-サラセミアである、請求項6に記載のポリヌクレオチド。
- 赤血球及び/又は赤血球前駆細胞に、請求項1に記載のポリヌクレオチドを導入することを含む、赤血球及び/又は赤血球前駆細胞に、ヒトβ-グロビンの発現を誘導するインビトロ方法。
- 前記赤血球前駆細胞がCD34+細胞を含む、請求項8に記載のインビトロ方法。
- 前記CD34+細胞が、異常ヘモグロビン症を有する個体に由来する、請求項9に記載のインビトロ方法。
- 前記ヒトβ-グロビンが、成人ヘモグロビン、胎児ヘモグロビン、B-グロビンM、又はその組み合わせを含む、請求項8に記載のインビトロ方法。
- ウイルス粒子を含む医薬組成物であって、前記ウイルス粒子がそれぞれ、請求項2に記載のレンチウイルス・ベクターを含むRNA鎖を含む、医薬組成物。
- 一以上の異常ヘモグロビン症の予防及び/又は治療で使用するためのウイルス粒子製剤を製造する方法であって、請求項1に記載のポリヌクレオチドを、少なくとも1つのビリオンタンパク質をコードするDNAパッケージング・プラスミド、エンベロープタンパク質をコードするDNAエンベロープ・プラスミドを含むパッケージング細胞に導入すること、前記ビリオンタンパク質と前記エンベロープタンパク質を発現させ、ウイルス粒子を形成させること、及び前記パッケージング細胞から前記ウイルス粒子を分離することを含む、方法。
- 前記ポリヌクレオチドが、配列番号3と少なくとも90%の配列同一性を有する配列を含む、請求項1に記載のポリヌクレオチド。
- 前記ポリヌクレオチドが、配列番号3の配列を含む、請求項1に記載のポリヌクレオチド。
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