JP7497292B2 - 遺伝子組換え単鎖免疫グロブリン - Google Patents
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Description
本発明は、医薬分野、特に、意図的にB細胞の特異性を再操作することに対する行き詰まりを打破することができる免疫グロブリンの新しい構造に関する。
癌治療は、細胞療法及び遺伝子治療の両方の免疫療法に関して開発が多数されて非常に活気のある分野である。腫瘍特異型抗原又は免疫チェックポイントを標的とする抗体が、完全に、多くの腫瘍タイプの予後を変え、長期寛解をもたらし、最終的に、死に至る病を概ね免疫系による制御の下、慢性病に転換させた。
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み、
核酸分子は、以下の構造を含み、
VH-PL1-VL-CL-PL2
PL1及びPL2は、同一又は異なる。
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-免疫グロブリン重鎖定常領域(CH)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み得、
核酸分子は、以下の構造を含み、
VH-PL1-VL-CL-PL2-CH
PL1及びPL2は、同一又は異なる。
-免疫グロブリン重鎖可変領域(VH)と、
-免疫グロブリン軽鎖可変領域(VL)と、
-免疫グロブリン軽鎖定常領域(CL)と、
-免疫グロブリン重鎖定常領域(CH)と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み、
VHは、VLにPL1を介して融合し、CLは、CHにPL2を介して融合し、PL1及びPL2は、同一又は異なる。
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み又はそれらからなり、
核酸分子は、以下の構造を含む。
VH-PL1-VL-CL-PL2
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-免疫グロブリン重鎖定常領域(CH)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み、
核酸分子は、以下の構造を含む。
VH-PL1-VL-CL-PL2-CH
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、
-ドナースプライス部位と、を含み又はこれらからなり、
核酸分子は、以下の構造を含む。
VH-PL1-VL-CL-PL2ドナースプライス部位
本発明の発現カセット又はベクターを非ヒト胚性幹細胞内に導入するステップと、
遺伝子導入胚性幹細胞を得るステップであって、本発明の組換え核酸分子が、ゲノム内に、好ましくは相同組換えにより挿入される、遺伝子導入胚性幹細胞を得るステップと、
前記遺伝子導入胚性幹細胞を、キメラを形成するように非ヒト動物の胚盤胞内に注入するステップと、
前記注入された胚盤胞を里親に再移植するステップと
を、含み得る。
非ヒト受精卵に、(i)本発明の発現カセット又はベクターと、(ii)カセット又はベクターを正しい座位において相同組換えにより標的化するために使用されるヌクレアーゼ系とを導入するステップと、
遺伝子導入受精卵を得るステップであって、本発明の発現カセット又はベクターが、ゲノム内に相同組換えにより挿入される遺伝子導入受精卵を得るステップと、
前記注入された受精卵を里親に再移植するステップと
を、含み得る。
-免疫グロブリン重鎖可変領域(VH)と、
-免疫グロブリン軽鎖可変領域(VL)と、
-免疫グロブリン軽鎖定常領域(CL)と、
-免疫グロブリン重鎖定常領域(CH)と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、を含み、
VHがVLにPL1を介して融合され、CLがCHにPL2を介して融合される。
PL1及びPL2は、同一又は異なるものでよい。
抗-CD20 scFull-Igの作成
遺伝子合成反応を用いて、抗-CD20 scFull-Ig(単鎖完全長Ig)をコードする完全合成カセットを作り出した。可変ドメインは、リツキシマブ配列に基づいたものだった。単鎖Fab断片を得るために、以下による独創的な方法を設計した。
-完全長VH、DJH及びVKJKを、18-残基リンカー(Whitlow 218リンカー、GSTSGSGKPGSGEGSTKG(配列番号:1)により連結した。
-この次に、Ckと、γ重鎖CH1ドメインとを、まさに同一の18残基リンカー配列により再度連結した。
CHO及び293細胞に対して、プラスミドベクターでMacsfectin試薬により遺伝子導入し、遺伝子導入の翌日0.5~1mg/mLのG418を補った培地による選択を行った。3~4週間後、上清を、発現のため、酵素結合免疫吸着検定法、そして、フローサイトメトリーによりスクリーニングした。上清を、最終的に、10-kDa(分子量)のカットオフを伴うビバスピンディスポーザルで遠心分離法により濃縮した。
ELISAについて、scFull-Igは、ポリクローナル抗ヒトFc特異的抗体により捉えられ、HRPコンジュゲート抗ヒトIgG(H+L)抗体により検知された(どちらもSigma Aldrich社製)。
図1:scFull-Ig方法の概略図。
Claims (20)
- 組換え核酸分子であって、当該組換え核酸分子は、
-免疫グロブリン重鎖可変領域(VH)をコードする配列と、
-免疫グロブリン軽鎖可変領域(VL)をコードする配列と、
-軽鎖定常領域(CL)をコードする配列と、
-ペプチドリンカー(PL1及びPL2)をコードする2つの配列と、
-ドナースプライス部位と、を含み、
前記ドナースプライス部位は、一定の免疫グロブリン重鎖遺伝子のCH1ドメインとの接合のためのドナースプライス部位であり、
前記核酸分子は、以下の構造
VH-PL1-VL-CL-PL2-ドナースプライス部位
を含み、PL1及びPL2は、同一又は異なり、
前記核酸分子は、宿主細胞のゲノム内の連結領域(JH)の遺伝子と免疫グロブリン重鎖の定常領域(C H )の遺伝子との間の免疫グロブリン重鎖座位内への、前記核酸分子の組込みを誘導するための追加のポリヌクレオチドをさらに含む組換え核酸分子。 - 前記ペプチドリンカーは、10~25アミノ酸長である請求項1に記載の組換え核酸分子。
- PL1及び/又はPL2は、配列番号1~7の配列と、少なくとも90%の配列番号1~7の配列との配列同一性を有する配列とからなる群から選択された配列を含むか、又はからなる請求項1又は2に記載の組換え核酸分子。
- PL1及び/又はPL2は、配列番号1の配列、又は少なくとも90%の配列番号1の配列との配列同一性を有する配列を含むか、又はからなる請求項1~3のいずれかに記載の組換え核酸分子。
- 前記核酸の発現を適切な宿主細胞内において調節配列と適合する条件下で誘導する1つ以上の調節配列に操作可能に連結される請求項1~4のいずれかに記載の組換え核酸分子を含む発現カセット。
- 請求項5に記載の発現カセットを含むベクター。
- 前記ベクターは、ウイルスベクターである請求項6に記載のベクター。
- 前記ベクターは、アデノ随伴ウイルス(AAV)ベクターである請求項6に記載のベクター。
- 請求項6~8のいずれかに記載のベクターを含むウイルス粒子。
- 請求項1~4のいずれかに記載の組換え核酸分子、請求項5に記載の発現カセット、請求項6~8のいずれかに記載のベクター又は請求項9に記載のウイルス粒子を含む単離細胞。
- 前記単離細胞は、ヒト胚性幹細胞ではない請求項10に記載の単離細胞。
- 前記細胞は、マウス胚性幹細胞である請求項10又は11に記載の細胞。
- 前記細胞は、B細胞である請求項10~12のいずれかに記載の細胞。
- 請求項10~13のいずれかに記載の少なくとも1つの細胞を含む、遺伝子組換え生物。
- 前記生物はマウスである請求項14に記載の遺伝子組換え生物。
- 免疫グロブリン重鎖可変領域(VH)と、免疫グロブリン軽鎖可変領域(VL)と、免疫グロブリン軽鎖定常領域(CL)と、免疫グロブリン重鎖定常領域(CH)と、ペプチドリンカー(PL1及びPL2)をコードする2つの配列とを含み、VHはVLにPL1を介して融合され、CLはCHにPL2を介して融合され、PL1及びPL2は同一か又は異なる抗体を産生する方法であって、
前記抗体を発現する請求項10~13のいずれかに記載の細胞又は請求項14又は15に記載の遺伝子組換え生物を提供するステップと、前記抗体を前記細胞培養液から又は前記生物の試料から回収するステップとを含む、抗体産生方法。 - 請求項1~4のいずれかに記載の組換え核酸分子、請求項5に記載の発現カセット、請求項6~8のいずれかに記載のベクター、請求項9に記載のウイルス粒子、又は請求項10~13のいずれかに記載の宿主細胞と、製薬上許容される賦形剤とを含む、医薬組成物。
- 病気の予防又は治療において使用するための、請求項1~4のいずれかに記載の組換え核酸分子、請求項5に記載の発現カセット、請求項6~8のいずれかに記載のベクター、請求項9に記載のウイルス粒子、請求項10~13のいずれかに記載の宿主細胞又は請求項17に記載の医薬組成物。
- 病気の診断又は検知方法において使用するための、請求項1~4のいずれかに記載の組換え核酸分子、請求項5に記載の発現カセット、請求項6~8のいずれかに記載のベクター、請求項9に記載のウイルス粒子、請求項10~13のいずれかに記載の宿主細胞又は請求項17に記載の医薬組成物。
- 病気の診断又は検知のためのキットであって、当該キットは、請求項1~4のいずれかに記載の組換え核酸分子、請求項5に記載の発現カセット、請求項6~8のいずれかに記載のベクター、請求項9に記載のウイルス粒子、請求項10~13のいずれかに記載の宿主細胞又は請求項17に記載の医薬組成物を含むキット。
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