JP5252618B2 - RNA干渉効果が高い芳香環修飾siRNA - Google Patents
RNA干渉効果が高い芳香環修飾siRNA Download PDFInfo
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Description
Fire et. al, Nature, 391, 806-811 (1998) Tuschl et. al., EMBO Journal, 20, 6877-6888 (2001)
項1.標的遺伝子中の標的配列に相補的な塩基配列からなるアンチセンス鎖RNA、及び該アンチセンス鎖RNAに相補的な塩基配列を有するセンス鎖RNAを有し、且つ前記標的遺伝子の発現を抑制できるsiRNAであって、該センス鎖RNAの5’末端から1〜6番目のヌクレオチドの少なくとも1つに直接又はリンカーを介して芳香族化合物が結合していることを特徴とする、芳香環修飾siRNA。
項2.前記芳香族化合物が、siRNAにインターカレート又はスタッキングが可能な化合物である、項1に記載の芳香環修飾2本鎖RNA。
項3.前記芳香族化合物が、フェニル基、フェノール基、ナフチル基又はピレン基を含む化合物である、項1に記載の芳香環修飾2本鎖RNA。
本発明の芳香環修飾siRNAに結合した芳香族化合物の数としては、特に制限されないが、例えば1〜3個、好ましくは1又は2個、更に好ましくは1個が例示される。
実施例1
1.芳香環修飾型21nt siRNAの合成
ルシフェラーゼ遺伝子及又はVEGF(vascular endothelial growth factor: 血管内皮成長因子)遺伝子の発現を抑制できる21nt siRNAを合成した。合成したRNAの配列を以下に示す。
ターゲット:ルシフェラーゼ
センス鎖:5’-GGCCUUUCACUACUCCUACGA-3’
アンチセンス鎖:3’-GACCGGAAAGUGAUGAGGAUG−5
ターゲット:VEGF
センス鎖:5’- UCCUACAGCACAACAAAUGUG-3’
アンチセンス鎖:3’- GAAGGAUGUCGUGUUGUUUAC−5。
上記で作成した芳香環修飾型siRNAの2本鎖形成能を確認した。2本鎖形成能の確認は、2μM濃度のRNAサンプル(10μl)を20% ポリアクリルアミドゲルを用い250Vで70分間サンプルを電気泳動し、銀染色キット(GEヘルスケア バイオサイエンス)で産物を染色(染色条件は製品マニュアル参照)することにより確認した。その結果、芳香環修飾siRNAは、未修飾siRNAと同様に2本鎖を形成していることが確認された。
芳香環修飾siRNAのヌクレアーゼ耐性を検討した。まず、最終濃度が2 μMになるよう調整した未修飾及び芳香環修飾型siRNAを10%FBS(三光純薬株式会社)を含むRPMI-1640培地(インビトロジェン)中(最終量110μl)、37℃でインキュベートし、0h、1h、2h、3h、4h、6h、8h、12h、24h、48h後にそれぞれ10μl取り、2μlのローデングダイを含むサンプルチューブに添加した。次いで、分解反応を停止させる為、サンプル採取後すぐ液体窒素中にて凍結し、−20℃にて保存した。得られた産物を20% ポリアクリルアミドゲルを用い250Vで70分間サンプルを電気泳動した。その後、銀染色キット(GEヘルスケア バイオサイエンス)で産物を染色し(染色条件は製品マニュアル参照)、ChemiImager 4000(Alpha Innotech corporation)でゲル解析を行った。芳香環修飾siRNAのヌクレアーゼ耐性結果を図3示す。また比較として、未修飾siRNAのヌクレアーゼ耐性結果も同時に示す。その結果、芳香環化合物が共有結合した芳香環修飾型siRNAは未修飾siRNAに比べ、ヌクレアーゼからの分解に対し高い耐性を保有していることが明らかとなった。特に、Phenyl基やNaphtyl基が結合した芳香環修飾型siRNAは高いヌクレアーゼ耐性を保有していることが明らかとなった。
合成した芳香環修飾siRNA及び未修飾siRNAのRNA干渉効果をウミシイタケルシフェラーゼをターゲットとして評価した。実験は、以下の手順で行った。実験前に1x105cell/mlに調整したHeLa細胞(ヒト子宮頸ガン細胞、東北大学加齢医学研究所)を96wellプレート上にそれぞれ100μl撒き、37℃で一晩インキュベートした。翌日、ウェル上の古い培地を取り除き、抗生物質を含まない新しい培地(MEM培地;GIBCO)をウェルにそれぞれ80 μl加え、ホタルおよびウミシイタケルシフェラーゼを発現するベクター(psiCHECKTM-2 Vector: プロメガ)とLipofectamineTM 2000 (商品名、インビトロジェン)の複合溶液を10μlずつHeLa細胞が入ったそれぞれのウェルに加えた。ここで発現ベクターは1ウェルあたり0.02μgになるように、またLipofectamineTM 2000は1ウェルあたり0.2μlになるよう設定し、OptiMem(インビトロジェン)で必要量を調整した。また、複合体を形成させる為に、発現ベクターとLipofectamineTM 2000をOptiMemを用いて混合した後、室温で30分間インキュベートした。複合溶液を加えた後、細胞を5% CO2 存在下、37℃で4時間インキュベートした。その後、ウミシイタケルシフェラーゼの遺伝子配列と相補的なアンチセンス配列を含む未修飾siRNA、芳香環修飾siRNAを最終濃度が0nM, 0.2nM, 0.5nM, 1nM, 2nM, 5nM, 10nMになるようLipofectamineTM 2000 (インビトロジェン) と複合体を形成させ、10μlの複合体溶液を発現ベクターを導入したHeLa細胞に加えた。ここで、1ウェルあたりの最終量は100 μlとなる。siRNAとLipofectamineTM 2000の複合溶液は、1ウェルあたり5 μlのRNA水溶液と5 μlのLipofectamineTM 2000 (0.2μl) OptiMem溶液を混合し、30分間室温でインキュベートすることにより作成した。siRNAを導入させた後、48時間インキュベートし、Dula-GloTM Luciferase Assay System(プロメガ)を用いてホタルおよびウミシイタケルシフェラーゼの発現量をルミノメータ(MicroLumat LB96p: BERTHOLD)で測定し、ホタルルシフェラーゼの発現量をコントロールとしてウミシイタケルシフェラーゼの発現抑制効果を算出した。
合成した芳香環修飾siRNA及び未修飾siRNAのRNA干渉効果をVEGF遺伝子をターゲットとして、HeLa細胞(ヒト子宮頸ガン細胞、東北大学加齢医学研究所)を用いて評価した。
実験前に、1x105cell/mlに調整したHeLa細胞(ヒト子宮頸ガン細胞、東北大学加齢医学研究所)を24ウェルプレートにそれぞれ1ml撒き10 % ウシ胎児血清 (FBS:三光純薬株式会社製)及び抗生物質(Kanamycin Sulfate : インビトロジェン社製)を含む培地中(MEM : インビトロジェン社製)、5 % CO2存在下、37 ℃で培養した。蛍光ラベル化オリゴヌクレオチド導入前に、抗生物質を含まない培地(450μl)へ交換した。蛍光ラベル化オリゴヌクレオチドは、アンチセンス鎖RNAの5’末端をFAMラベル化したものを使用し、未修飾のセンス鎖RNA及び芳香環を修飾したセンス鎖RNAと2本鎖を形成させた。未修飾siRNA及び芳香環修飾siRNAはLipofectamineTM 2000 を用いて細胞内へ導入させた。siRNAは最終濃度が200nMになるよう調整し、LipofectamineTM 2000 との複合体は上記と同様の方法で作成した。準備した50μlのsiRNA/ LipofectamineTM 2000 複合体を450μlの培地を含む細胞へ加え4時間、37℃で5%CO2存在下インキュベートした。その後、細胞を培地またはPBS(-)で3回洗浄し、共焦点蛍光レーザー顕微鏡及びフローサイトメトリーを用いて、未修飾siRNA及び芳香環修飾siRNAの細胞導入性を観察した。また、A562細胞(ヒト肺ガン細胞、東北大学加齢医学研究所)及びSH10-TC細胞(ヒト胃ガン細胞、東北大学加齢医学研究所)への細胞導入性も同様の方法で評価した。
Claims (3)
- 標的遺伝子中の標的配列に相補的な塩基配列からなるアンチセンス鎖RNA、及び該アンチセンス鎖RNAに相補的な塩基配列を有するセンス鎖RNAを有し、且つ前記標的遺伝子の発現を抑制できるsiRNAであって、該センス鎖RNAの5’末端のヌクレオチドのリン酸基にリンカーを介して、フェニル基、フェノール基、又はナフチル基からなる群より選択される一つが結合していることを特徴とする、芳香環修飾siRNA。
- 前記リンカーが、下記式(L−1)又は(L−2)で表される請求項1に記載の芳香環修飾siRNA;
−O−CH2−CO−NH−(CH2)n1− (L−1)
−(CH2)n0−CO−NH−(CH2)n1− (L−2)
(上記式(L−1)及び上記式(L−2)において、n1は1〜10の整数を示し、上記式(L−2)において、n0は0〜10の整数を示す。)。
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