JP2006325540A - オリゴデオキシヌクレオチドおよびこれを利用する免疫修飾剤 - Google Patents
オリゴデオキシヌクレオチドおよびこれを利用する免疫修飾剤 Download PDFInfo
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Abstract
【解決手段】 式(I)
5'−ACTTTCGTTTTCTGCGTCAA−3' (I)
で示される塩基配列を含むオリゴデオキシヌクレオチド、これを有効成分とする免疫修飾剤およびラクトバチルスラムノーサスに属する微生物のゲノムDNAから、マウスおよびヒト由来Bリンパ球に対するマイトジェン活性を有するDNA断片を選択することを特徴とする上記式(I)で示される塩基配列を含むオリゴデオキシヌクレオチドの製造方法。
【選択図】 なし
Description
5'−ACTTTCGTTTTCTGCGTCAA−3' (I)
で示される塩基配列を含むオリゴデオキシヌクレオチドである。
ラクトバチルス・ラムノーサスGG(LGG)からDNAの抽出:
LGG TMC0514を、MRS培養液(Difco, Detroit, USA)中で、37℃、16時間培養し、更にルチャンスキー(Luchansky)ら(1991年)の方法により、染色体DNAを単離した。すなわち、培養したLGG細胞を、5000gで10分間遠心後、細胞を50mM EDTA、0.5% Tween 20、0.5% Triton X−100、20mg/mL リゾチーム、10mg/mL N−アセチルムラミダーゼSG(生化学工業、東京)および100μg/mL RNAase Aを含む50mM Tris−HCl緩衝液(pH8.0)に再懸濁した。
リンパ球の精製および増殖の測定:
本発明者らが以前発表した方法(リンパ球幼若化活性試験:Kitazawaら、1992年)により、ネズミ脾臓からリンパ球を調製した。すなわち、MACSシステム(MACS、Miltenyi Biotec., Germany)を用いて脾細胞懸濁液からB細胞を精製した。ビオチン標識抗CD45R mAB(Caltag Laboratory, Burlingame, CA, USA)で脾細胞懸濁液を染色し、ストレプトアビジン(streptavidin)ミクロビーズで対比染色を行った。CD45R+細胞の陽性細胞をカラム(VarioMACS、Miltenyi Biotec., Germany)上で選別した。
At:1分あたりの処理培養液中放射能
Ab:1分あたりのバックグラウンド中放射能
Ac:1分あたりの対照培養液中放射能
マイトジェン活性DNAクローンのクローニングと単離:
LGGの染色体DNAをSau3AI(宝酒造、京都)で消化し、2%アガロースゲル電気泳動法により0.5kb、0.5‐1.0kbおよび1.0kb以上の3画分に分別した。クアンタム・プレップ・キット(Quantum Prep kit;Bio-Rad、Nazareth、Belgium)を用いてDNAを採取し、0.5kb未満のDNAをpUC119ベクター(宝酒造、京都)のBam HI部位に結紮した。組換体プラスミドを用いてコンピテント(Competent)E.コリDH5α細胞を形質転換させた。コロニーの色調およびPCRプライマー、M13プライマーM4:5'−GTTTTCCCAGTCACGAC−3'およびM13プライマーRV:5'−CAGGAAACAGCTATGAC−3'を用いた直接的ポリメラーゼ連鎖反応(PCR)に基づいて、形質転換細胞のスクリーニングを実施した。E.コリの組換体として67個の白いコロニーを得た。
クローンの配列決定:
精製した組換体プラスミドから、セクイサーム・エクセル II・ロング−リード・シークエンシング・キット(SequiTherm EXCEL II Long-Read Sequencing kit;Epicenter Technology, Madison, WI, USA)を用いてマイトジェン性DNA挿入断片の配列を決定した。一次配列を、GENETYX−SV・バージョン6・ソフトウエア・パッケージ(GENETYX-SV Version 6 software package;ソフトウェア・デベロップメント、東京)を用いて解析した。
活性ODN配列の確認:
実施例4で活性が認められたDN ID35、ODN ID2420およびODN ID20について、配列を3'方向あるいは5'方向へ一部シフトしたODNを合成し、そのマイトジェン活性を調べた。この結果を図4に示す。この結果から、コア配列が失われることにより、活性も大幅に減少することが明らかになった。
フローサイトメトリー:
脾細胞(4×105個/ウェル)をゲノムDNA(50μg/mL)またはODN(10μM)で6時間、12時間および24時間にわたり刺激した。刺激後、2%FCS+0.01%アジ化ナトリウムを含むリン酸塩緩衝生理食塩液(PBS)で細胞をよく洗浄し、CD45R、33D1、CD69およびCD86(PharMingen, San Diego, Ca, USA)に対する抗体とインキュベートした後、ストレプトアビジン−フィコエリスリン(streptavidin-phycoerythrin;PharMingen)とともにインキュベートした。続いて細胞を、4℃の1%パラホルムアルデヒド中で20分間固定し、FACSキャリバーTM(FACSCaliburTM;Becton-Dickinson, Mountain View, CA, USA)を用いて分析した(細胞40000個/試料)。この結果、ODN ID35の活性は、ODN 1826のそれとほぼ同じであった。
培養上清中サイトカインの測定および脾細胞における遺伝子発現:
ネズミ脾細胞懸濁液を、10%FCS添加RPMI 1640完全培地(Sigma)中で最終濃度1×107個/mL(計200μL/ウェル)で3通り培養した。50μg/mLのゲノムDNAあるいは10μMのリン酸ジエステルODNを培養液に添加した。培地のみで培養した細胞を非刺激対照とした。24時間刺激後に培養上清を採取し、サイトカインの分析まで−80℃で保存した。IL−12p70およびIFN−γの濃度(1:2あるいは1:4に希釈)を、eバイオサイエンス(eBioscience;San Diego, CA, USA)より購入した試薬を含むサンドウィッチELISAを用いて、製造業者の使用説明書に従って測定した。この結果を図5に示す。
ヒト末梢血単核細胞(PBMC)に対する作用:
末梢血単核細胞を、フィコール−ハイパック(Ficoll-Hypaque;Sigma-Aldrich, St. Louis, MO)を用いる密度勾配遠心法により分離した。2% FCS、100U/mL ペニシリン、100μg/mLストレプトマイシンおよび2mMグルタミンを含むRPMI1640(Sigma)中にPBMCを懸濁した。この細胞を2×105個/ウェルの濃度で、96穴培養プレート中、48時間培養した。また、各ODNの濃度は、10μとした。ネズミB細胞の増殖測定の項に記載した方法により、PBMCの培養、刺激および増殖測定を実施した結果を表1に示す。
Claims (3)
- 下式(I)
5'−ACTTTCGTTTTCTGCGTCAA−3' (I)
で示される塩基配列を含むオリゴデオキシヌクレオチド。 - 下式(I)
5'−ACTTTCGTTTTCTGCGTCAA−3' (I)
で示されるオリゴデオキシヌクレオチドを有効成分とする免疫修飾剤。 - ラクトバチルスラムノーサスに属する微生物のゲノムDNAから、マウスおよびヒト由来Bリンパ球に対するマイトジェン活性を有するDNA断片を選択することを特徴とする下式(I)
5'−ACTTTCGTTTTCTGCGTCAA−3' (I)
で示される塩基配列を含むオリゴデオキシヌクレオチドの製造方法。
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JPWO2009005124A1 (ja) * | 2007-07-04 | 2010-08-26 | キッコーマン株式会社 | 乳酸菌由来の2本鎖rna |
US8334371B2 (en) | 2007-07-04 | 2012-12-18 | Kikkoman Corporation | Lactic acid bacteria-derived double-stranded RNA |
JP5099649B2 (ja) * | 2007-07-04 | 2012-12-19 | キッコーマン株式会社 | 乳酸菌由来の2本鎖rna |
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