JP6486836B2 - 遺伝子発現制御のための人工ミミックmiRNAおよびその用途 - Google Patents
遺伝子発現制御のための人工ミミックmiRNAおよびその用途 Download PDFInfo
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Description
X領域とY領域とが連結した一本鎖核酸であり、
前記X領域は、成熟miRNAのガイド鎖配列またはその部分配列であり、前記Y領域に対する連結側領域(XB)および非連結側領域(XF)からなり、
前記連結側領域(XB)は、その領域内で分子内アニーリングしない配列であり、
前記Y領域は、前記X領域の前記非連結側領域(XF)と、分子内アニーリングする配列であることを特徴とする。
前記人工ミミックmiRNAは、前記本発明の人工ミミックmiRNAであり、前記人工ミミックmiRNAにおける前記ガイド鎖またはその部分配列が、前記疾患に関与する遺伝子の発現を抑制する成熟miRNAのガイド鎖またはその部分配列であることを特徴とする。
本発明の人工ミミックmiRNAは、前述のように、
X領域とY領域とが連結した一本鎖核酸であり、
前記X領域は、成熟miRNAのガイド鎖配列またはその部分配列であり、前記Y領域に対する連結側領域(XB)および非連結側領域(XF)からなり、
前記連結側領域(XB)は、その領域内で分子内アニーリングしない配列であり、
前記Y領域は、前記X領域の前記非連結側領域(XF)と、分子内アニーリングする配列であることを特徴とする。
O=Y−XF
O:オーバーハングの長さ
Y:Y領域の全長の塩基数(Y)
XF:非連結側領域(XF)の塩基数(XF)
UGGCAGUGUCUUAGCUGGUUGU
hsa−let−7a(配列番号2)
UGAGGUAGUAGGUUGUAUAGUU
hsa−let−7f(配列番号3)
UGAGGUAGUAGAUUGUAUAGUU
hsa−miR−150(配列番号4)
UCUCCCAACCCUUGUACCAGUG
hsa−miR−29b(配列番号5)
UAGCACCAUUUGAAAUCAGUGUU
本発明の発現抑制用組成物は、前述のように、標的遺伝子の発現を抑制するための組成物であって、前記本発明の人工ミミックmiRNAを含むことを特徴とする。本発明の組成物は、前記本発明の人工ミミックmiRNAを含むことが特徴であり、その他の構成は、何ら制限されない。本発明の発現抑制用組成物は、例えば、発現抑制用試薬ということもできる。
本発明の発現抑制方法は、前述のように、標的遺伝子の発現を抑制する方法であって、前記本発明の人工ミミックmiRNAを使用することを特徴とする。本発明の発現抑制方法は、前記本発明の人工ミミックmiRNAを使用することが特徴であって、その他の工程および条件は、何ら制限されない。
本発明の疾患の治療方法は、前述のように、前記本発明の人工ミミックmiRNAを、患者に投与する工程を含み、前記人工ミミックmiRNAにおける前記ガイド鎖またはその部分配列が、前記疾患に関与する遺伝子の発現を抑制する成熟miRNAのガイド鎖またはその部分配列であることを特徴とする。本発明の治療方法は、前記本発明の人工ミミックmiRNAを使用することが特徴であって、その他の工程および条件は、何ら制限されない。
本発明の使用は、前記標的遺伝子の発現抑制のための、前記本発明の人工ミミックmiRNAの使用である。
成熟miR−34aのガイド鎖に基づいて、本発明の人工ミミックmiRNAを合成し、AXLおよびMETの発現抑制を確認した。
ポジティブコントロールのmiRNAとして、以下に示すガイド鎖(配列番号1)およびパッセンジャー鎖(配列番号6)からなるヒト成熟miR−34aを合成した。
また、ネガティブコントロールとして、前記成熟miR−34aにおける前記ガイド鎖の塩基組成をスクランブルにしたガイド鎖スクランブル(配列番号7)およびそれに対応するパッセンジャー鎖(配列番号8)とからなる成熟miR−34aスクランブルを合成した。
ガイド鎖(配列番号1)
5’-UGGCAGUGUCUUAGCUGGUUGU-3’
パッセンジャー鎖(配列番号6)
5’-CAAUCAGCAAGUAUACUGCCCU-3’
成熟miR−34aスクランブル
ガイド鎖(配列番号7)
5’-UGUAUCGUUAUCGGGUCGGUUG-3’
パッセンジャー鎖(配列番号8)
5’-CAACCGACCCGAUAACGAUACA-3’
ghR−34a(G22/P18)(配列番号9)
5’-UGGCAGUGUCUUAGCUGGUUGUAGCUAAGACAAUGCCCUC-3’
ghR−34a(G22/P18)スクランブル(配列番号10)
5’-UGUAUCGUUAUCGGGUCGGUUGACCCGAUAACGGUACCUC-3’
前記miRNAを、ヒト非小細胞性肺がん細胞株(NCI−H1299)に導入し、ヒト成熟miR−34aがターゲットとするAXL mRNA、MET mRNAおよびCDK6 mRNAの検出を行った。
5’-CTCAACCAGGACGACTCCAT-3’ (配列番号11)
5’-AGACCGCTTCACTCAGGAAA-3’ (配列番号12)
CDK6 プライマーセット
5’-AAGTTCCAGAGCCTGGAGTG-3’ (配列番号13)
5’-CGATGCACTACTCGGTGTGA-3’ (配列番号14)
GAPDH プライマーセット
5’-ATGGGGAAGGTGAAGGTCG-3’ (配列番号15)
5’-GGGTCATTGATGGCAACAATATC-3’ (配列番号16)
MET プライマーセット
5’-CAGGCAGTGCAGCATGTAGT-3’ (配列番号17)
5’-TGTCCAACAAAGTCCCATGA-3’ (配列番号18)
β−アクチン プライマーセット
5’-ACTCTTCCAGCCTTCCTTCC-3’ (配列番号19)
5’-TGTTGGCGTACAGGTCTTTG-3’ (配列番号20)
実施例1の人工ミミックmiRNAであるghR−34a(G22/P18)について、ガイド鎖の3’末端側を欠失させ、AXLおよびMETの発現抑制を確認した。
5’-UGGCAGUGUCUUAGCUGGUUGUAGCUAAGACAAUGCCCUC-3’
ghR−34a(G21/P17)(配列番号21)
5’-UGGCAGUGUCUUAGCUGGUUGGCUAAGACAAUGCCCUC-3’
ghR−34a(G20/P16)(配列番号22)
5’-UGGCAGUGUCUUAGCUGGUUCUAAGACAAUGCCCUC-3’
ghR−34a(G19/P15)(配列番号23)
5’-UGGCAGUGUCUUAGCUGGUUAAGACAAUGCCCUC-3’
ghR−34a(G18/P14)(配列番号24)
5’-UGGCAGUGUCUUAGCUGGAAGACAAUGCCCUC-3’
ghR−34a(G17/P13)(配列番号25)
5’-UGGCAGUGUCUUAGCUGAGACAAUGCCCUC-3’
実施例1の人工ミミックmiRNAであるghR−34a(G17/P13)(配列番号25)の改変を行い、AXLの発現抑制を確認した。
成熟hsa let−7a−1のガイド鎖について、本発明の人工ミミックmiRNAを合成し、HMGA2の発現抑制を確認した。
ポジティブコントロールのmiRNAとして、以下に示すガイド鎖(配列番号2)およびパッセンジャー鎖(配列番号31)からなるヒト成熟let−7a−1を合成した。また、ネガティブコントロールとして、データベース上、どのmRNAも標的としない配列(ノン−ターゲット)を合成した。そして、実施例の人工ミミックmiRNAとして、成熟let−7a−1のガイド鎖(配列番号2)を有するghR−let−7a G18/P14(配列番号34)を合成した。ghR−let−7a G18/P14の下記配列において、下線部が、前記ガイド鎖の部分配列に対応する。これらのmiRNAの概略を、以下に示す。
ガイド鎖(配列番号2)
5’-UGAGGUAGUAGGUUGUAUAGUU-3’
パッセンジャー鎖(配列番号31)
5’-CUAUACAAUCUACUGUCUUUC-3’
ノン−ターゲット コントロール
ガイド鎖(配列番号32)
5’-UACUAUUCGACACGCGAAGTT-3’
パッセンジャー鎖(配列番号33)
5’-CUUCGCGUGUCGAAUAGUATT-3’
ghR-let-7a G18/P14(配列番号34)
5’-UGAGGUAGUAGGUUGUAUCCUACUACCUCCUC-3’
前記miRNAを、ヒト肺がん細胞株A549細胞株(ATCC社)に導入し、下記プライマーセットを使用した以外は、前記実施例1と同様にして、ヒト成熟let−7aがターゲットとするHMGA2 mRNAの検出を行った。なお、トランスフェクション時のmiRNAの終濃度は、25nmol/Lとした。前記ノン−ターゲットは、RNAデータベース解析からヒトのRNAに最も結合する可能性が低い、もしくはオフターゲット効果の最も低いと予測される配列とした。
5’-GAAGCCACTGGAGAAAAACG-3’ (配列番号35)
5’-CTTCGGCAGACTCTTGTGAG-3’ (配列番号36)
実施例1で作製したghR−34a(G17/P13)(配列番号25)をヒト非小細胞性肺がん細胞株(NCI−H1299)に導入して、AXLの発現抑制および細胞増殖の抑制を確認した。なお、ポジティブコントロールのmiRNAとして、実施例1で合成したヒト成熟miR−34aを使用した。
実施例2で作製したghR−34a(G17/P13)(配列番号25)をヒト末梢血の単球に導入して、炎症性サイトカインの誘導を確認した。なお、ポジティブコントロールのmiRNAとして、実施例1で合成したヒト成熟miR−34aを使用した。
ghR−34a(G17/P13)スクランブル(配列番号37)
5’-UGUAUCGUUAUCGGGUCAUAACGAUACCUU-3’
実施例2で作製したghR−34a(G17/P13)(配列番号25)について、成熟mi−R34aのパッセンジャー鎖と同様の副作用が生じるか否かを確認した。
実施例2で作製したghR−34a(G17/P13)(配列番号25)を、DICER1欠損またはAGO2欠損の肺癌細胞株に導入し、DICER非依存的またはAGO非依存的にAXL mRNAの発現を抑制できるか確認した。
CRISPR/Cas9 Systemを用いて、H1299から、DICER1を欠損する肺癌細胞株を作成した。図15に、ヒトDicer1 mRNAにおけるCRISPR/Cas9 ガイド鎖のハイブリダイゼーションの位置を示す。得られら2株(#1、#2)について、DICER1のタンパク質発現をウェスタンブロットにより確認したところ、発現は見られず、また、内在性miRNAであるlet−7a、miR−18aの発現も著しく減少した。前者の結果から、DICER1がタンパク質レベルで欠損していること、後者の結果から、DICER1が機能的に欠損していることが確認できた。
CRISPR/Cas9 Systemを用いて、H1299から、AGO2を欠損する肺癌細胞株を作成した。図17に、ヒトAGO2 mRNAにおけるCRISPR/Cas9 ガイド鎖のハイブリダイゼーションの位置を示す。得られた2株(#1、#2)について、AGO2のタンパク質発現をウェスタンブロットにより確認したところ、発現は見られなかった。また、GAPDHに対するsiRNAをトランスフェクションして、GAPDHの発現を確認したところ、前記siRNAのGAPDH発現抑制活性が著しく低下した。前者の結果から、AGO2がタンパク質レベルで欠損していること、後者の結果から、AGO2が機能的に欠損していることが確認できた。
実施例1で作製したghR−34a(G17/P13)(配列番号25)を、肺がんモデルマウスに導入し、治療効果を確認した。
Claims (11)
- 配列番号25の塩基配列からなるポリヌクレオチドを含むことを特徴とする人工ミミックmiRNA。
- 前記ポリヌクレオチドの3’末端側に、オーバーハングを有する、請求項1記載の人工ミミックmiRNA。
- 前記オーバーハングが、0〜4塩基長である、請求項2記載の人工ミミックmiRNA。
- 標的遺伝子の発現を抑制するための組成物であって、
請求項1から3のいずれか一項に記載の人工ミミックmiRNAを含むことを特徴とする発現抑制用組成物。 - 請求項1から3のいずれか一項に記載の人工ミミックmiRNAを含むことを特徴とする、薬学的組成物。
- 標的遺伝子の発現を抑制する方法であって、
非ヒト動物に対し、請求項1から3のいずれか一項に記載の人工ミミックmiRNAを使用することを特徴とする発現抑制方法。 - 請求項1から3のいずれか一項に記載の人工ミミックmiRNAを、細胞、組織または器官に投与する工程を含む、請求項6記載の発現抑制方法。
- 請求項1から3のいずれか一項に記載の人工ミミックmiRNAを、in vivoまたはin vitroで投与する、請求項6または7記載の発現抑制方法。
- 請求項1から3のいずれか一項に記載の人工ミミックmiRNAを、非ヒト動物に投与する、請求項6から8のいずれか一項に記載の発現抑制方法。
- がんの治療方法であって、
請求項1から3のいずれか一項に記載の人工ミミックmiRNAを、非ヒト動物に投与する工程を含むことを特徴とする治療方法。 - がんの治療に使用するための人工ミミックmiRNAであって、
前記人工ミミックmiRNAは、請求項1から3のいずれか一項に記載の人工ミミックmiRNAであることを特徴とする人工ミミックmiRNA。
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| JPWO2015099122A1 (ja) | 2017-03-23 |
| US20170037398A1 (en) | 2017-02-09 |
| EP3088524A1 (en) | 2016-11-02 |
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