JP6751185B2 - GST−π遺伝子を調節するためのRNA干渉剤 - Google Patents
GST−π遺伝子を調節するためのRNA干渉剤 Download PDFInfo
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- JP6751185B2 JP6751185B2 JP2019123904A JP2019123904A JP6751185B2 JP 6751185 B2 JP6751185 B2 JP 6751185B2 JP 2019123904 A JP2019123904 A JP 2019123904A JP 2019123904 A JP2019123904 A JP 2019123904A JP 6751185 B2 JP6751185 B2 JP 6751185B2
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Description
センス鎖及びアンチセンス鎖を含むGST-πの発現を阻害するための核酸分子であって、前記鎖が二重鎖領域を形成する核酸分子。当該核酸分子は、GST-πの発現を阻害するためのsiRNA分子であってよく、修飾又は化学的修飾された1つ以上のヌクレオチドを含むことができる。
例示的な標的ヒトグルタチオンS-トランスフェラーゼ(ヒトGST-π)mRNAの核酸配列は、GenBankアクセッション番号NM_000852.3(hGSTP1)に開示されており、986ヌクレオチドの長さである。
本発明の実施形態は、修飾又は化学的修飾されたsiRNA分子を包含し、遺伝子サイレンシングの活性及び効力の増加などの治療用途のための強化された特性を提供することができる。本発明は、遺伝子調節及び遺伝子サイレンシングのためのsiRNA分子の活性及び効力を失うことなく、血清安定性に優れ、さらにオフターゲット効果が低減した修飾又は化学的修飾されたsiRNA分子を提供する。いくつかの態様では、本発明は、siRNAの安定性及び有効性を増強する様々な組み合わせの修飾又は化学修飾を有するsiRNAを提供する。
本発明の実施形態は、GST-π及び/又はGST-πタンパク質の発現をダウンレギュレート又は阻害するために使用することができるRNAi分子を提供することができる。
RNA干渉(RNAi)は、短い干渉RNA(siRNA)によって媒介される動物における配列特異的転写後遺伝子サイレンシングを意味する。例えば、Zamoreら、Cell、2000、Vol. 101、25〜33頁; Fireら、Nature、1998、Vol. 391、806811頁; Sharp、Genes&Development、1999、Vol. 13、pp. 139-141参照。
いくつかの態様において、RNAi分子は、RISC活性RNAi分子を生成するようにプロセシングされるダイサー基質として適した長さにすることができる。例えば、Rossiら、US2005/0244858参照。
本発明の核酸分子及びRNAi分子は、分子の直接的な適用によって、又は担体若しくは希釈剤と組み合わせた分子を用いて、細胞又は組織に送達することができる。
トランスフェクションの1日前に、10%FBSを含む100μlのDMEM(HyCloneカタログ番号SH30243.01)を96ウェルプレートに2×103細胞/ウェルで播種し、5%CO2の空気中で加湿雰囲気を含む37℃インキュベーターで培養した。トランスフェクションの前に、培地を、2%FBSを含む90μlのOpti-MEM I還元血清培地(Life Technologiesカタログ番号31985-070)に変更した。その後、0.2μlのLipofectamine RNAiMax(Life Technologiesカタログ番号13778-100)を4.8μlのOpti-MEM Iと室温で5分間混合した。次に、1μlのsiRNAを4μlのOpti-MEM Iと混合し、LF2000溶液と混合し、ボルテックスなしで穏やかに混合した。室温で5分後、混合物を室温でさらに10分間インキュベートし、RNA-RNAiMax複合体を形成させた。さらに、10μlのRNA-RNAiMax複合体をウェルに添加し、プレートを手で静かに振盪した。細胞を5%CO2の空気中で加湿雰囲気を含む37℃のインキュベーター中で2時間インキュベートした。培地を、2%FBSを含む新鮮なOpti-MEM I還元血清培地に交換した。トランスフェクションの24時間後、細胞を氷冷PBSで1回洗浄した。細胞を室温で5〜30分間、50μlのCell-to-Ct溶解緩衝液(Life Technologiesカタログ番号4391851C)で溶解した。5μlの停止溶液を加え、室温で2分間インキュベートした。mRNAレベルはTAQMANを用いたRT-qPCRにより直ちに測定した。サンプルは-80℃で凍結し、後にアッセイすることができた。
0.2mg/mlのsiRNAを37℃で10%ヒト血清とともにインキュベートした。特定の時点(0、5、15及び30分)で、200μlの試料を等分し、抽出溶媒(クロロホルム:フェノール:イソアミルアルコール=24:25:1)200μlで抽出した。サンプルをボルテックスし、室温で10分間、13,000rpmで遠心分離し、次いで、上層溶液を移し、0.45μmのフィルターで濾過した。濾液を300μlのHPLC注入バイアルに移した。LCMSの場合、移動相はMPA:H2O中100mM HFIP+7mM TEA、MPB:50%メタノール+50%アセトニトリルとした。カラム:Waters Acquity OST 2.1×50mm、1.7μmを使用した。
PsiCHECK-2 (F)プラスミド挿入物:
配列番号285
ctcgag gggcaacTGAAGCCTTTTGAGACCCTGcTgTcccag gcggccgc
PsiCHECK-2 (R)プラスミド挿入物:
配列番号286
ctcgag cTgggacagCAGGGTCTCAAAAGGCTTCagTTgccc gcggccgc
PsiCHECK-2 (Fmi1)プラスミド挿入物:
配列番号287
ctcgag gggcaacTCTACGCAAAACAGACCCTGcTgTcccag gcggccgc
PsiCHECK-2 (Fmi2)プラスミド挿入物:
配列番号288
ctcgag gggcaacTCTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT gTcccag gcggccgc
PsiCHECK-2 (Fmi3)プラスミド挿入物:
配列番号289
ctcgag gggcaacTCTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT gTcccag gcggccgc
PsiCHECK-2 (Fmi4)プラスミド挿入物:
配列番号290
ctcgag gggcaacTCTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT CTACGCAAAACAGACCCTGcT gTcccag gcggccgc
Claims (10)
- センス鎖及びアンチセンス鎖を含むGST-πの発現を阻害する核酸分子であって、
前記センス鎖及び前記アンチセンス鎖で形成される二重鎖領域を有し、
前記二重鎖領域における前記アンチセンス鎖はUAGGGUCUCAAAAGGCUUC(5’〜3’)のヌクレオチド配列又は修飾を有する当該ヌクレオチド鎖を含み、前記二重鎖領域における前記センス鎖はGAAGCCUUUUGAGACCCUA(5’〜3’)のヌクレオチド配列又は修飾を有する当該ヌクレオチド鎖を含み、
前記センス鎖及び前記アンチセンス鎖で形成される二重鎖領域は、30塩基以下のヌクレオチド長である核酸分子。 - 前記二重鎖領域を形成する前記センス鎖及び前記アンチセンス鎖の少なくとも一方は、5’末端及び/又は3’末端に長さが1〜8ヌクレオチド長の一本鎖領域からなるオーバーハングを有する、請求項1記載の核酸分子。
- 前記修飾が、2’-デオキシヌクレオチド、2’-O-アルキル置換ヌクレオチド、2’-デオキシ-2’-フルオロ置換ヌクレオチド、ホスホロチオエートヌクレオチド、ロックドヌクレオチド又はそれらの任意の組み合わせである、請求項1記載の核酸分子。
- 前記アンチセンス鎖が複数の位置にデオキシヌクレオチドを有し、前記複数の位置が前記UAGGGUCUCAAAAGGCUUC(5’〜3’)における以下のうちの1つである、請求項1記載の核酸分子。
5’末端からの位置4、6及び8のそれぞれ;
5’末端からの位置3、5及び7のそれぞれ;
5’末端からの位置1、3、5及び7のそれぞれ;
5’末端からの位置3〜8のそれぞれ;又は
5’末端からの位置5〜8のそれぞれ - 前記二重鎖領域内に1つ以上の2'-デオキシ-2'-フルオロ置換ヌクレオチドを有する、請求項1記載の核酸分子。
- 請求項1〜6いずれか1項記載の核酸分子及び薬学的に許容される担体を含む医薬組成物。
- 前記担体が脂質分子又はリポソームを含む、請求項7記載の医薬組成物。
- 悪性腫瘍、癌、突然変異KRASを発現する細胞に起因する癌、肉腫及び癌腫から選ばれる少なくとも一種に対する治療のための請求項7記載の医薬組成物。
- 請求項1〜6いずれか1項記載の核酸分子を含むベクター又は細胞。
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