JPWO2010101226A1 - 核酸複合体、及び核酸送達用組成物 - Google Patents
核酸複合体、及び核酸送達用組成物 Download PDFInfo
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- JPWO2010101226A1 JPWO2010101226A1 JP2011502807A JP2011502807A JPWO2010101226A1 JP WO2010101226 A1 JPWO2010101226 A1 JP WO2010101226A1 JP 2011502807 A JP2011502807 A JP 2011502807A JP 2011502807 A JP2011502807 A JP 2011502807A JP WO2010101226 A1 JPWO2010101226 A1 JP WO2010101226A1
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Abstract
Description
項1.シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子を含有することを特徴とする、核酸複合体。
項2.RNA干渉若しくは翻訳阻害が可能な核酸分子1重量部当たり、シクロアミロース化合物が1〜4000重量部である、項1に記載の核酸複合体。
項3.シクロアミロース化合物の重合度が、10〜500である、項1に記載の核酸複合体。
項4.RNA干渉若しくは翻訳阻害が可能な核酸分子が、siRNAである、項1に記載の核酸複合体。
項5.RNA干渉若しくは翻訳阻害が可能な核酸分子と、シクロアミロース化合物を水溶液中で混合することにより得られる凝集体である、項1に記載の核酸複合体。
項6.項1乃至6のいずれかに記載の核酸複合体、及び核酸送達用キャリアーを含有する、核酸送達用組成物。
項7.核酸送達用キャリアーが、(A)ジアシルホスファチジルコリン、(B)コレステロール及びその誘導体よりなる群から選択される少なくとも1種、及び(C)脂肪族第1級アミンを含有する組成物である、項6に記載の核酸送達用組成物。
項8.核酸送達用キャリアーに含まれる(A)成分が、アシル基部分の炭素数が4〜23のジアシルホスファチジルコリンである、項7に記載の核酸送達用組成物。
項9.核酸送達用キャリアーに含まれる(B)成分が、コレステロールである、項7に記載の核酸送達用組成物。
項10.核酸送達用キャリアーに含まれる(C)成分が、炭素数が10〜20のアルキルアミンである、項7に記載の核酸送達用組成物。
項11.核酸送達用キャリアーにおける(A)成分:(B)成分:(C)成分のモル比が、5〜9:1〜5:1である、項7に記載の核酸送達用組成物。
項12.核酸送達用キャリアーが、(A)〜(C)成分によりリポソーム膜が形成されたリポソーム製剤である、項7に記載の核酸送達用組成物。
項13.項6乃至12のいずれかに記載の核酸送達用組成物を含む、医薬組成物。
項14.シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子の、核酸複合体の製造のための使用。
項15.項1乃至6のいずれかに記載の核酸複合体、及び核酸送達用キャリアーの、核酸送達用組成物の製造のための使用。
項16.項1乃至6のいずれかに記載の核酸複合体の、RNA干渉が可能な核酸分子を細胞内に送達するための医薬を製造するための使用。
項17.シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子を含有する核酸複合体を、細胞に接触させる工程を含む、RNA干渉が可能な核酸分子の細胞内への送達方法。
項18.項6乃至12のいずれかに記載の核酸送達用組成物を、細胞に接触させる、項17に記載の送達方法。
(1)核酸複合体
本発明の核酸複合体は、RNA干渉若しくは翻訳阻害が可能な核酸分子及びシクロアミロース化合物を含有することを特徴とするものである。
上記核酸複合体は、核酸送達用キャリアーと混合されることによって、核酸送達用キャリアーに取込まれ、RNA干渉若しくは翻訳阻害が可能な核酸分子の細胞内への送達が可能な状態になる。即ち、本発明は、更に、上記核酸複合体と、核酸送達用キャリアーとを含有する核酸送達用組成物を提供する。
本発明の核酸送達用組成物に使用される核酸送達用キャリアーとしては、核酸複合体を細胞内に取り込ませることが可能である限り、特に制限されない。当該核酸送達用キャリアーとしては、例えば、LipofectamineTM 2000等の従来公知のものを使用することができる。
(A)アシル基部分の炭素数が4〜23のジアシルホスファチジルコリン、(B)コレステロール及び/又はその誘導体であり、及び(C)炭素数が10〜20のアルキルアミンの組み合わせ;更に好ましくは(A)ジミリストイルホスファチジルコリン、ジパルミトイルホスファチジルコリン、及び/又はジステアロイルホスファチジルコリン、(B)コレステロール、及び(C)ステアリルアミンの組み合わせ。
上記核酸送達用キャリアーは、細胞内への送達対象となる核酸複合体を包含できる限り、その形態については特に制限されないが、リポソームの形態であることが望ましい。例えば、上記キャリアー-1をリポソームの形態にする場合、上記(A)〜(C)成分及び必要に応じて添加される他の脂質は、リポソーム膜を形成する。
核酸送達用キャリアーがリポソーム形態である場合、本発明の核酸送達用組成物において、リポソームの内水相に上記核酸複合体が封入された状態で存在していても、またリポソーム膜の内側又は外側に上記核酸複合体がイオン結合若しくは疎水結合により結合して存在していてもよい。好ましくは、前者の形態である。また、核酸送達用キャリアーがリポソーム以外の形態である場合であれば、本発明の核酸送達用組成物において、上記核酸複合体が核酸送達用キャリアーの成分とイオン結合若しくは疎水結合によりリポプレックス化して複合体を形成していればよい。
量100重量部に対して、上記核酸複合体が1〜100重量部、好ましくは10〜100重量部、更に好ましくは20〜100重量部となる割合が挙げられる。
本発明は、また、RNA干渉若しくは翻訳阻害が可能な核酸分子の細胞内への送達方法を提供するものである。本発明の核酸分子の細胞内への送達方法は、前記核酸複合体又は核酸送達用組成物を細胞に接触させる工程を含む。前記核酸複合体又は核酸送達用組成物と細胞との接触は、核酸複合体又は核酸送達用組成物の適当量が、核酸分子の導入対象となる細胞に接触される限り特に制限されない。
Tris-EDTA (TE)緩衝液(Fluka社製)を用いて、2 μMの濃度でsiRNAを含む溶液(siRNA溶液)を調製した。また、別途、Tris-EDTA (TE) 緩衝液(Fluka社製)を用いて、25 μMの濃度でシクロアミロースを含む溶液(シクロアミロース溶液)を調製した。室温で、これらの等量を1分間混合することによりsiRNA複合体を調製した。
Tris-EDTA (TE)緩衝液(Fluka社製)を用いて、2 μMの濃度でsiRNAを含む溶液(siRNA溶液)を調製した。また、別途、Tris-EDTA (TE) 緩衝液(Fluka社製)を用いて、2 μMの濃度でα-シクロデキストリンを含む溶液(α-シクロデキストリン溶液)を調製した。室温で、これらの等量を1分間混合することによりsiRNA複合体(比較例1)を調製した。
実施例1及び比較例1−2で得られたsiRNA複合体の粒子径、及び該siRNA複合体を含む溶液のゼータ電位の測定を行った。粒子径は、ZETASIZER 3000HSA (MALVERN INSTRUMENT)(レーザー光回折法を用いて体積平均粒子径を測定)によって測定した平均粒子径(nm)を示す。ゼータ電位は、同様にZETASIZER 3000HSA(MALVERN INSTRUMENT)を用いて測定した。
モル比で、ジステアロイルホファチジルコリン(DSPC):コレステロール:ステアリルアミン=7:3:1となるように秤量し、これらをナス型フラスコでクロロホルム中に溶解させた。ロータリーエバポレーターにより減圧乾燥させ、脂質薄膜を形成した。次いで、得られた脂質薄膜に対してDSPC濃度で30 mg/mLとなるように、実施例1で得られたsiRNA複合体を0.014 mg/ml含む溶液を添加し、混合した後、エクストルーダーを用いて孔径800 nm及び200 nmの膜に通し粒子径を揃え、カチオン性リポソーム形態であるsiRNA送達用組成物(実施例2:リポソーム化法)を調製した。
本試験では、siRNAに予めFITC標識をしたものを用いて、上記実施例1と同様の方法で、FITC標識siRNA複合体を調製した。このFITC標識siRNA複合体を用いて、上記実施例2と同条件で、核酸送達用組成物を調製した。そして、調製直後のsiRNA送達用組成物を遠心処理(75,000 rpm、1時間)により沈殿させ、その上清に存在するFITC標識siRNAの蛍光強度を測定することによりsiRNAの封入率(全siRNAに対するリポソーム内に封入されたsiRNAの割合:%)を算出した。
MTS試験法を用いて行った。MTS試験は、Promega社製の「CellTiter96 Aqueous One Solution Cell Proliferation Assay」を用いて行った。具体的には、96穴プレートにA594細胞(ATCC, USA)を3.16×104cells/wellで10容量%ウシ胎児血清(FBS)を含むダルベッコ変法イーグル培地(DMEM)200 μL中に播種し、37℃下24時間培養した。ハンクスバランスドサルトソリューション(HBSS)で3回洗浄後、FBSを含まないDMEMに替え、上記実施例2の核酸送達用組成物(リポソーム化法及びリポプレックス化法)をそれぞれ1ウェル当たり20 μL添加し、37℃、5%CO2条件下で4時間インキュベートした。次いで、ウェル中の培養上清を10容量%FBS含有DMEMに替え、更に37℃、5%CO2条件下で20時間インキュベートした。次いで、各ウェルにMTS(メタチオネイン)試薬20 μL及びFBS10容量%含有DMEM培地100 μLを加え、2時間インキュベートした後、492 nmにおける吸光度を測定し、細胞生存率を算出した。なお、細胞生存率は、核酸送達用組成物を添加せずに上記条件でインキュベートした際に測定された492 nmにおける吸光度を100%として算出した。
フローサイトメトリーを用いてsiRNAに標識したFITCの蛍光強度を測定することにより細胞内取り込みを評価した。なお、本試験では、siRNAに予めFITC標識をしたものを用いて調製した核酸送達用組成物を利用した。具体的には、24穴プレートにA594細胞(ATCC,USA)を5×105cells/wellで10容量%FBSを含むDMEM 500 μL中に播種し、37℃、5%CO2条件下で24時間培養した。HBSSで3回洗浄後、各ウェルにFBSを含まないDMEM 0.45 mLを加え、更に上記実施例2の核酸送達用組成物(リポソーム化法)(含有されるDSPCの濃度:30mg/mL)を1ウェル当たり0.05 mL添加し、37℃、5%CO2条件下で4時間インキュベートした。次いで、ウェル中の培養上清を10容量%FBS含有DMEMに替え、更に37℃、5%CO2条件下で20時間インキュベートした。各ウェルをHBSSで1回洗浄後、Cell Scrub Buffer(Gene Therapy Systems, Inc.製)を0.2 mL添加し37℃、5%CO2条件下で15分間インキュベートした。更に、HBSSで2回洗浄後、トリプシンを用いて、ウェル底部に付着している細胞を剥がし取り、遠心分離により細胞を回収し、得られた細胞をHBSSに懸濁させた。その懸濁液を孔径41μmの膜に通過させた。核酸送達用組成物の添加4時間後の細胞の蛍光強度についてフローサイトメトリーを用いて測定した。また、比較対照として、市販で遺伝子ベクターとして頻用されているLipofectamine2000TM(Invitrogen社製)をOptiMEM培地で0.1 mg/mLに希釈した溶液と、TE緩衝液にsiRNAを2 μMの濃度に希釈したsiRNA溶液とを容量比1:1で混合して得られた比較用核酸送達用組成物を用いて、上記と同様に細胞の蛍光強度を測定した。
Claims (18)
- シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子を含有することを特徴とする、核酸複合体。
- RNA干渉若しくは翻訳阻害が可能な核酸分子1重量部当たり、シクロアミロース化合物が1〜4000重量部である、請求項1に記載の核酸複合体。
- シクロアミロース化合物の重合度が、10〜500である、請求項1に記載の核酸複合体。
- RNA干渉若しくは翻訳阻害が可能な核酸分子が、siRNAである、請求項1に記載の核酸複合体。
- RNA干渉若しくは翻訳阻害が可能な核酸分子と、シクロアミロース化合物を水溶液中で混合することにより得られる凝集体である、請求項1に記載の核酸複合体。
- 請求項1乃至6のいずれかに記載の核酸複合体、及び核酸送達用キャリアーを含有する、核酸送達用組成物。
- 核酸送達用キャリアーが、(A)ジアシルホスファチジルコリン、(B)コレステロール及びその誘導体よりなる群から選択される少なくとも1種、及び(C)脂肪族第1級アミンを含有する組成物である、請求項6に記載の核酸送達用組成物。
- 核酸送達用キャリアーに含まれる(A)成分が、アシル基部分の炭素数が4〜23のジアシルホスファチジルコリンである、請求項7に記載の核酸送達用組成物。
- 核酸送達用キャリアーに含まれる(B)成分が、コレステロールである、請求項7に記載の核酸送達用組成物。
- 核酸送達用キャリアーに含まれる(C)成分が、炭素数が10〜20のアルキルアミンである、請求項7に記載の核酸送達用組成物。
- 核酸送達用キャリアーにおける(A)成分:(B)成分:(C)成分のモル比が、5〜9:1〜5:1である、請求項7に記載の核酸送達用組成物。
- 核酸送達用キャリアーが、(A)〜(C)成分によりリポソーム膜が形成されたリポソーム製剤である、請求項7に記載の核酸送達用組成物。
- 請求項6乃至12のいずれかに記載の核酸送達用組成物を含む、医薬組成物。
- シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子の、核酸複合体の製造のための使用。
- 請求項1乃至6のいずれかに記載の核酸複合体、及び核酸送達用キャリアーの、核酸送達用組成物の製造のための使用。
- 請求項1乃至6のいずれかに記載の核酸複合体の、RNA干渉若しくは翻訳阻害が可能な核酸分子を細胞内に送達するための医薬を製造するための使用。
- シクロアミロース及びその誘導体よりなる群から選択される少なくとも1種のシクロアミロース化合物、並びにRNA干渉若しくは翻訳阻害が可能な核酸分子を、細胞に接触させる工程を含む、RNA干渉が可能な核酸分子の細胞内への送達方法。
- 請求項6乃至12のいずれかに記載の核酸送達用組成物を、細胞に接触させる、請求項17に記載の送達方法。
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KR20110128325A (ko) | 2011-11-29 |
CN102369282B (zh) | 2014-04-02 |
WO2010101226A1 (ja) | 2010-09-10 |
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