JP4846569B2 - 抗体作製用非ヒト動物およびこれを用いた抗体作製方法およびシステム - Google Patents
抗体作製用非ヒト動物およびこれを用いた抗体作製方法およびシステム Download PDFInfo
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Description
〔2〕 可溶型蛋白質をコードした遺伝子が外来から導入されたトランスジェニック動物からなる、〔1〕記載の非ヒト動物。
〔3〕 可溶型蛋白質をコードした遺伝子が外来から導入されたトランスジェニック動物の子孫である、〔2〕記載の非ヒト動物。
〔4〕 膜蛋白質がウイルス由来である、〔1〕〜〔3〕のいずれかに記載の非ヒト動物。
〔5〕 ウイルスがバキュロウイルスである、〔4〕に記載の非ヒト動物。
〔6〕 膜蛋白質がgp64である、〔5〕記載の非ヒト動物。
〔7〕 可溶型蛋白質が膜貫通領域を欠損したgp64である、〔6〕記載の非ヒト動物。
〔8〕 可溶型蛋白質がgp64の細胞外領域からなる、〔6〕記載の非ヒト動物。
〔9〕 非ヒト動物がマウスである、〔1〕〜〔8〕のいずれかに記載の非ヒト動物。
〔10〕 雄が繁殖能を有する、〔6〕〜〔9〕のいずれかに記載の非ヒト動物。
〔11〕〔1〕〜〔10〕のいずれかに記載の非ヒト動物を、標的抗原を含有する免疫原で免疫する工程、
前記標的抗原に対する抗体または抗体をコードした遺伝子を取得する工程を含む、抗体作製方法。
〔12〕 免疫原がウイルス粒子またはその一部である、〔11〕記載の抗体作製方法。
〔13〕 ウイルスがバキュロウイルスである、〔12〕記載の抗体作製方法。
〔14〕 標的抗原が膜蛋白質である、〔11〕〜〔13〕のいずれかに記載の抗体作製方法。
〔15〕〔1〕〜〔10〕記載の非ヒト動物を含む抗体作製システム。
本発明において、「標的抗原」とは、目的とする抗体が認識する抗原を言う。標的抗原は、抗原性を有する任意の物質から選択することができる。具体的には、蛋白質、糖鎖、脂質、あるいは無機物質などが抗原性を示す物質として知られている。標的抗原は、天然に存在するものであることもできるし、人工的に合成されたものであっても良い。人工的に合成されたものには、遺伝子工学技術を利用して作製された組み換え蛋白質や、化学的に合成された様々な有機物質が含まれる。
上記膜蛋白質の可溶型蛋白質をコードした遺伝子を保持した非ヒト動物に標的抗原以外に背景抗原として当該膜蛋白質を含む免疫原を免疫する工程と、前記標的抗原に対する抗体または抗体をコードした遺伝子を取得する工程とが含まれる。
本発明により、膜蛋白質の可溶型蛋白質をコードした遺伝子を保持した非ヒト動物を含む抗体作製システムが提供される。
なお本明細書において引用された全ての先行技術文献は、参照として本明細書に組み入れられる。
gp64遺伝子(配列番号:1、全長;1539bp)の膜貫通領域(1465塩基から1539塩基)を欠損させ細胞外領域のみを持つ遺伝子断片(可溶型gp64;1464bp、配列番号:3)をPCRにて調製した。
Tgm作製に用いるインジェクション用DNAフラグメントの調製は、pCAG-sgp64ベクターを制限酵素SalIおよびPstIで処理した後、sgp64遺伝子を含む断片(約3.7kb)を切り出し、Gel Extraction Kit (QIAGEN)により回収し、この断片を3ng/μlになるようにPBS-で希釈することにより行った。DNAフラグメントを注入するマウス前核期胚の回収は、次のように行なった。すなわち、BALB/cA雌マウス(日本クレア)を過排卵処理(5 i.uのeCG(セロトロピン;帝国臓器)を腹腔内投与、さらに48時間後5 i.uのhCG(プベローゲン;三共)を腹腔内投与した後、同系統の雄マウス(日本クレア)と交配した。翌朝、膣栓を確認した雌マウスの卵管を潅流することにより、前核期胚を回収した。DNAフラグメントの前核期胚への注入は、マイクロマニピュレーターを用いて行った(ジーンターゲティングの最新技術(洋土社)、190-207 2000)。翌日、2細胞期に発生していた胚を、偽妊娠1日目の受容雌の左右の卵管に、各10個前後(1匹あたり20個前後)を移植した。分娩予定日に至っても産仔を娩出しなかった受容雌については、帝王切開を施し里親に哺育させた。
実施例2において得られた雄Tgm(F1マウス)の繁殖能を調べた。繁殖能は 雄sgp64Tgm(F1マウス)が8週齢になった時点で、BALB/cAマウスと交配させ、その産仔の有無、数を確認することにより行った。
sgp64Tgmに出芽バキュロウイルス(pepT1-AcMNPV(pepT1-BV))を以下の通り免疫し、gp64に対するトレランス誘導の有無を確認した。
免疫はフロイント完全アジュバント(Difco)と不完全アジュバント(Difco)を用いて常法に従ってエマルジョンを作製し、皮下投与する事により行った。初回免疫量は1mg/匹で、2回免疫量は0.5mg/匹で行った。また2回免疫は初回免疫から14日後に行った。初回免疫から17日後に眼窩採血を行い、血清を採取した。コントロールとして、非トランスジェニックマウスに対しても同様に免疫およびその後の血清採取を行った。
抗原に用いたpepT1-BVを、12%ゲルを用い1μg/レーンで還元条件下SDS-PAGEを行った。泳動後PVDF膜にエレクトロブロットした。この膜に、上記において採取した血清を1/1000希釈し、反応させた後、PBS-T (0.05% Tween20含有PBS)を用いて、室温で5分間の洗浄を3回行なった。洗浄後、1/1000希釈したBiotin-Anti-Mouse IgG(γ)(Zymed)とStreptavidin-AlkalinPhosphatase(Zymed)を反応させた。発色はアルカリホスファターゼ染色キット(ナカライ)を用いて行った。
Claims (8)
- 膜貫通領域を欠損したgp64であって、当該gp64が配列番号1から3のいずれかに記載の1から488アミノ酸配列または当該アミノ酸配列において一つまたはそれ以上のアミノ酸の欠失、置換、付加もしくは挿入の変異が加えられたアミノ酸配列をコードした遺伝子を保持したマウスであって当該マウスがgp64に対して免疫寛容であるマウス。
- 膜貫通領域を欠損したgp64をコードした遺伝子が外来から導入されたマウスである、請求項1記載のマウス。
- 膜貫通領域を欠損したgp64をコードした遺伝子が外来から導入されたマウスの子孫である、請求項2記載のマウス。
- 膜貫通領域を欠損したgp64が、gp64の細胞外領域からなる、請求項1〜3のいずれかに記載のマウス。
- 雄が繁殖能を有する、請求項1〜4のいずれかに記載のマウス。
- 請求項1〜5のいずれかに記載のマウスを、標的抗原を含有するバキュロウイルスで免疫する工程、
前記標的抗原に対する抗体または抗体をコードした遺伝子を取得する工程を含む、抗体作製方法。 - 標的抗原が膜蛋白質である、請求項6に記載の抗体作製方法。
- 請求項1〜5のいずれかに記載のマウスを含む、抗体作製システム。
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