JP6178786B2 - 組換えfviiiの生産において真核細胞の生産性を向上させる方法 - Google Patents
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Description
BDDrFVIIIを生産する対数増殖期のHEK293F細胞を遠心分離した後、細胞ペレットを0.5×106細胞/mLの生存細胞密度で無血清細胞培地に再懸濁した。その後、37℃、5%/95%のCO2/空気中、振盪培養器中で100rpmまたは200rpmにて、125mLのバッフル付エルレンマイヤーボトル中で細胞を培養した。自動Cedex(イノバティス社)細胞カウンターを用いてトリパンブルー排除法により、毎日全ての培養について細胞密度を測定した。細胞懸濁液中のイオン濃度を1M NaCl+30mM CaCl2に上昇させることにより、蓄積したFVIIIを細胞から放出させた。細胞を遠心分離により除去し、発色基質法(Coatest(登録商標) SP FVIII)によりFVIIIを測定した。増殖プロファイルは類似していたが(図1)、バッチ培養3日後に高速撹拌培養は83%高い蓄積FVIII:C濃度を示した(図2)。
BDDrFVIIIを生産するHEK293F細胞を、6個の0.4Lバイオリアクターを備えた装置(Multifors、インフォース(Infors)社)中で、種々の撹拌速度を用いてバッチモードで並列培養した。他の細胞培養パラメーターを一定に維持した制御環境において、撹拌速度が生産性にどのような影響を与えるかを調べることを目的とした。高撹拌速度(>300rpm)で調べることができるように、細胞培養用途で通常使用されるバイオリアクター用の電気スターラーモーターを、細胞培養用途で通常用いられ、1200rpmまで動作させることができる、より強力なスターラーモーターに交換した。溶存酸素圧(DOT)設定点を90%に設定して細胞懸濁液中のスパージャーストーン(sparger stone)から空気を加えて調節した。生存細胞密度、生存率、および凝集率をCedex(イノバティス社)細胞カウンターで測定した。細胞懸濁液中のイオン濃度を1M NaCl+30mM CaCl2に上昇させることにより、蓄積したFVIIIを細胞から放出させた。細胞を遠心分離により除去し、発色基質法(Coatest(登録商標) SP FVIII)によりFVIIIを測定した。調べた撹拌速度、本明細書において動力密度に相当する用語であるエネルギー散逸率(ε)、および細胞特異的生産性(qp)を表1に示す。撹拌速度を200rpmから950rpmまで上昇させると、細胞特異的な生産性が向上した。1200rpmにおけるqpが950rpmにおけるqpより低いことから分かるように、生産性の向上は950rpm超で横ばいになった。
2L撹拌型タンクバイオリアクター中の連続定常状態灌流培養で、BDDrFVIIIを生産するHEK293F細胞を培養した。バイオリアクターは、撹拌用に90mmピッチで羽根を有するインペラを備えている。培地交換は中空糸フィルターを用いて行い、これも細胞懸濁液にせん断を生じさせる。撹拌速度以外の全ての細胞培養パラメーターを実験中一定に維持した。生存細胞密度、生存率、および凝集率をCedex(イノバティス社)細胞カウンターで測定した。細胞懸濁液中のイオン濃度を1M NaCl+30mM CaCl2に上昇させることにより、蓄積したFVIIIを細胞から放出させた。細胞を遠心分離により除去し、発色基質法(Coatest(登録商標) SP FVIII)によりFVIIIを測定した。調べた撹拌速度は185rpm、255rpm、および325rpmであり、これはそれぞれ113W/m3、210W/m3、および610W/m3の動力を培養液に与える。撹拌速度は細胞特異的増殖率に影響を与えなかった(図3)。しかし、撹拌速度の増加により、細胞特異的生産性が向上した(図4)。
異なる15個の100L生産規模の撹拌型タンクバイオリアクターバッチ中で、BDDrFVIIIを生産するHEK293F細胞を培養し、それらのうち、低エネルギー散逸率(6W/m3)を用いた2つを対照とし、高エネルギー散逸率(29W/m3)を有する13個でせん断力増大の影響を調べた。細胞密度の平均値は、2つの低エネルギーバッチでは29.2 106細胞/mlであり、13個の高エネルギーバッチでは27.6 106細胞/mlであった。バイオリアクターは、撹拌用に225mmピッチの羽根を有するインペラを備えている。培地交換は連続遠心分離により行った。Cedex(イノバティス社)細胞カウンターにより生存細胞密度および生存率を測定した。細胞懸濁液中のイオン濃度を0.3M NaCl+30mM CaCl2に上昇させることにより、蓄積したFVIIIを細胞から放出させた。細胞を遠心分離により除去し、発色基質法(Coatest(登録商標) SP FVIII)によりFVIIIを測定した。調べた撹拌速度は45rpmおよび75rpmであり、これはそれぞれ6W/m3および29W/m3のエネルギーを培養液に与える。実験により、撹拌速度を増加させることにより培養液へのエネルギー入力(エネルギー散逸率、ε)を増大させると、生産性が向上することが示された(表2)。結論として、大規模生産培養においても、小規模培養で見られたのと同様に、せん断力を増大することにより生産性の向上を実現させることが可能であった。
90mm、45°ピッチの羽根を有するインペラを用いて、185rpmで一定に撹拌した2L撹拌型タンクバイオリアクター中、灌流モードで、BDDrFVIIIを生産するHEK293F細胞を培養した。バイオリアクターの通常の運転モードでは、灌流による培地交換に連続遠心分離を用いた。比較のために、中空糸ユニットを用いて、培地交換による灌流を行った。中空糸ユニットは交互接線流で用いた。これは、細胞がフィルター膜の中および外にポンピングされることを意味し、これにより、細胞培養液に連続的にせん断力が加えられる。撹拌速度、pH、溶存酸素圧、および温度などの他の細胞培養パラメーターを両方の培養で同じ値で一定に維持した。驚くべきことに、せん断力を得るために中空糸膜を用いて培養へのエネルギー入力を増大させることによりせん断力を増大させると、細胞特異的FVIII生産率が有意に向上することが見出された(図5)。細胞懸濁液中のイオン濃度を1M NaCl+30mM CaCl2に上昇させることにより、蓄積したFVIIIを細胞から放出させた。細胞を遠心分離により除去し、発色基質法(Coatest(登録商標) SP FVIII)によりFVIIIを測定した。
Claims (6)
- 113W/m3〜610W/m3の動力密度を加えることによるヒト細胞懸濁液の機械的運動によって、ヒト細胞懸濁液にせん断応力を生じさせる条件下で前記ヒト細胞懸濁液を培養することを特徴とする、細胞増殖および組換え第VIII因子(rFVIII)の生産に必要な栄養成分を含む培地中での前記ヒト細胞懸濁液の培養時に、前記ヒト細胞懸濁液中で生産されるrFVIIIの生産性を向上させる方法であって、ヒト細胞がHEK293F細胞であり、インペラを備えた培養容器により前記機械的運動が開始される、rFVIIIの生産性を向上させる方法。
- 前記rFVIIIがBドメイン欠失rFVIIIである、請求項1に記載の方法。
- 前記培地中に少なくとも1種類の非イオン性界面活性剤を含む、請求項1又は請求項2に記載の方法。
- 前記少なくとも1種類の非イオン性界面活性剤が、プルロニックF68、Tween20、およびTween80から選択される、請求項3に記載の方法。
- 前記少なくとも1種類の非イオン性界面活性剤の濃度が、0.00001wt%〜1wt%である、請求項3又は請求項4に記載の方法。
- せん断を増大することで、細胞凝集が最小限に抑えられている、請求項1〜請求項5のいずれか一項に記載の方法。
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