JP5897708B2 - 哺乳類細胞培養物 - Google Patents
哺乳類細胞培養物 Download PDFInfo
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- JP5897708B2 JP5897708B2 JP2014519184A JP2014519184A JP5897708B2 JP 5897708 B2 JP5897708 B2 JP 5897708B2 JP 2014519184 A JP2014519184 A JP 2014519184A JP 2014519184 A JP2014519184 A JP 2014519184A JP 5897708 B2 JP5897708 B2 JP 5897708B2
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Description
TNFR:Fc)およびベラタセプト(CTLA4:Fc)等の抗体のFc部分に融合されるタンパク質が、そのような組換え融合タンパク質に特異的に含まれる。
本実験は、バッチまたは流加バッチ流加法を用いた異なる開始条件、その後、交互接線流濾過を用いた連続灌流を比較する。灌流は、灌流前にさらなる流加を伴わない指数関数的増殖期(「バッチ」開始)の初期に、または指数関数的増殖期の終盤のいずれかに始まり、静止期または産生期(「流加バッチ」開始)に入り、灌流前に無血清確定流加培地のいくつかの複数回のボーラス流加を受けた。
0日目に、組換え抗体を発現するCHO細胞を、2Lの産生バイオリアクターに、バッチ開始において作業量1500mLの無血清確定培地中、および流加バッチ開始において作業量1300mLの無血清確定培地中、1×106生存細胞/mLで播種した。バッチ培養物の場合、培養物を36℃で、DOを30%で、撹拌を215rpmで維持した。流加バッチ培養物を430rpmで攪拌した。灌流前に流加バッチ培養物に7g/Lのグルコースを毎日流加し、灌流中、すべての培養物を4g/Lグルコース以上で維持した。灌流(交互接線流)は、バッチ培養物において4日目(0.25容積/日)に、流加バッチ培養において8日目(0.75容積/日)に始まった。灌流開始前に、流加バッチ培養物は、4日目(7.5%の初期作業量)および6日目(10%の初期作業量)に、濃縮無血清確定流加培地の複数回のボーラス流加を受けた。灌流流量設定が表2に提供される。培養物を21日間維持した。
本実験は、上述の流加バッチスタートアップでの交互接線流灌流への灌流量および温度変化の影響を特徴付ける。すべての培養物は、灌流が7日目に始まった流加バッチ開始培養物であった。4分の3の作業量から全作業量に、または全作業量から4分の3の作業量に移行した灌流流量を試験した。14日目の36℃から33℃への温度変化も試験した。
本実験を、L−アスパラギン制限培養環境またはL−アスパラギン非制限培養環境のいずれかを用いて、産生期中の生存細胞密度への灌流培地アスパラギン濃度および灌流開始条件の影響を調査するように設計した。
本実験は、灌流中の培地条件を比較する。この2Lバイオリアクター実験において、細胞を化学的に定義されたバッチ培地に1.5Lの作業量で播種し、3日間培養し、その後、17.3mMのL−アスパラギンおよび4.6mMのL−グルタミンまたは5mMのL−アスパラギンおよび10mMのL−グルタミンのいずれかを含有した化学的に定義された灌流培地を用いて12日間灌流した。30kDaの中空糸フィルタ(GE Healthcare,Little Chalfont,UK)を有する交互接線流灌流および濾過システム(Refine Technologies,Hanover,NJ)を用いて、灌流を達成した。灌流は、1日当たり0.3培養量の速度で3日目に始まった。灌流速度は、以下の表6に示されるように、4日目、9日目、および11日目に増加した。培養物を36oCで、DOを30%で、pHを7.0で、撹拌を400rpmで維持した。
本実施例は、ベンチ規模およびパイロット規模での成長を制御するために、アスパラギン制限を用いてATF灌流プロセスにおいて培養されたクローン抗体発現CHO細胞株の能力を比較する。ベンチ規模のモデルは2Lバイオリアクターを利用し、パイロット規模のモデルは500Lを利用した。ベンチ規模において、細胞を化学的に定義されたバッチ培地に1.5Lの作業量で播種し、パイロット規模において、作業量は、約378Lであった。細胞をバッチ培地中で3日間培養し、その後、5mMのL−アスパラギンおよび10mMのL−グルタミンを含有した化学的に定義された灌流培地を用いて12日間灌流した。交互接線流灌流および30kDaの中空糸フィルタ(GE Healthcare,Little Chalfont,UK)を有する濾過システム(Refine Technologies,Hanover,NJ)を用いて、灌流を達成した。灌流は、1日当たり0.3培養量の速度で3日目に始まった。灌流速度は、以下の表7に示されるように、4日目、9日目、および11日目に増加した。培養物を36oCで、DOを30%、pHを6.9で維持した。
Claims (52)
- 組換えタンパク質を発現する哺乳類細胞培養物における細胞増殖を停止させる方法であって、
バイオリアクター内の無血清培養培地中に哺乳類細胞培養物を確立することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって細胞増殖停止を誘導することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって前記哺乳類細胞を増殖停止した状態に維持することと、を含む、方法。 - 組換えタンパク質を発現する哺乳類細胞培養物における組換えタンパク質産生を増加させる方法であって、
バイオリアクター内の無血清培養培地中に哺乳類細胞培養物を確立することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって細胞増殖停止を誘導することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって前記哺乳類細胞を増殖停止した状態に維持することと、を含む、方法。 - 組換えタンパク質を発現する哺乳類細胞培養物を所望の血中血球容積に制限する方法であって、
バイオリアクター内の無血清培養培地中に哺乳類細胞培養物を確立することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって細胞増殖停止を誘導することと、
5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって前記哺乳類細胞を増殖停止した状態に維持することと、を含む、方法。 - 5mM以下のL−アスパラギン濃度を有する無血清灌流培地での前記灌流は、前記培養の3日目または3日目よりも前に始まる、請求項1〜3のいずれかに記載の方法。
- 細胞増殖停止の誘導は、産生期の前に起こる、請求項1〜3のいずれかに記載の方法。
- 細胞増殖停止の誘導は、産生期中に起こる、請求項1〜3のいずれかに記載の方法。
- 細胞増殖停止は、L−アスパラギン欠乏によって誘導される、請求項1〜3のいずれかに記載の方法。
- 36℃から31℃への温度変化をさらに含む、請求項1〜3のいずれかに記載の方法。
- 36℃から33℃への温度変化をさらに含む、請求項1〜3のいずれかに記載の方法。
- 前記温度変化は、増殖期と産生期との間の遷移時に生じる、請求項8または9に記載の方法。
- 前記温度変化は、産生期中に生じる、請求項8または9に記載の方法。
- 組換えタンパク質を発現する哺乳類細胞を培養する方法であって、
バイオリアクター内の無血清培養培地中に哺乳類細胞培養物を確立することと、
増殖期中に前記哺乳類細胞を増殖させ、前記培養培地を無血清流加培地の複数回のボーラス流加で補充することと、
無血清灌流培地での灌流によって産生期中に前記哺乳類細胞を維持することと、を含み、前記産生期中の前記血中血球容積は、35%以下である、方法。 - 灌流は、前記細胞培養の5日目〜9日目に始まる、請求項12に記載の方法。
- 灌流は、前記細胞培養の5日目〜7日目に始まる、請求項12または13に記載の方法。
- 灌流は、前記細胞が産生期に達したときに始まる、請求項12に記載の方法。
- L−アスパラギン欠乏によって細胞増殖停止を誘導し、その後、5mM以下のL−アスパラギン濃度を有する無血清灌流培地で灌流することをさらに含む、請求項12に記載の方法。
- 5mM以下のL−アスパラギン濃度を有する無血清灌流培地での灌流によって細胞増殖停止を誘導することをさらに含む、請求項12に記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、5mM以下である、請求項1〜3、16、および17のいずれかに記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、4.0mM以下である、請求項1〜3および16〜18のいずれかに記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、3.0mM以下である、請求項1〜3および16〜19のいずれかに記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、2.0mM以下である、請求項1〜3および16〜20のいずれかに記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、1.0mM以下である、請求項1〜3および16〜21のいずれかに記載の方法。
- 前記無血清灌流培地中のL−アスパラギンの前記濃度は、0mMである、請求項1〜3および16〜22のいずれかに記載の方法。
- 前記細胞培養培地の前記L−アスパラギン濃度は、L−アスパラギン欠乏前およびL−アスパラギン欠乏中に監視される、請求項7または16に記載の方法。
- 産生期中の前記血中血球容積は、35%以下であることをさらに含む、請求項1〜3のいずれかに記載の方法。
- 前記血中血球容積は、35%以下である、請求項12または25に記載の方法。
- 前記血中血球容積は、30%以下である、請求項12、25、および26のいずれかに記載の方法。
- 35%以下の血中血球容積での前記哺乳類細胞培養物の生存細胞密度は、10×106生存細胞/mL〜80×106生存細胞/mLである、請求項12または25に記載の方法。
- 前記哺乳類細胞培養物の生存細胞密度は、20×106生存細胞/mL〜30×106生存細胞/mLである、請求項28に記載の方法。
- 灌流は、連続灌流を含む、請求項1〜3および12のいずれかに記載の方法。
- 灌流の速度は、一定である、請求項1〜3および12のいずれかに記載の方法。
- 灌流は、1日当たり1.0作業量以下の速度で行われる、請求項1〜3および12のいずれかに記載の方法。
- 灌流は、前記産生期中の1日当たり0.25作業量から前記細胞培養中の1日当たり1.0作業量に増加する速度で行われる、請求項12に記載の方法。
- 灌流は、前記細胞培養の9日目〜11日目に1日当たり1.0作業量に達する速度で行われる、請求項12に記載の方法。
- 灌流は、前記細胞培養の10日目に1日当たり1.0作業量に達する速度で行われる、請求項12または34に記載の方法。
- 前記無血清流加培地の複数回のボーラス流加は、前記細胞培養の3日目または4日目に始まる、請求項12に記載の方法。
- 前記哺乳類細胞培養物は、前記バイオリアクターに無血清培養培地中の少なくとも0.5×106〜3.0×106細胞/mLを播種することによって確立される、請求項1〜3および12のいずれかに記載の方法。
- 前記哺乳類細胞培養物は、前記バイオリアクターに無血清培養培地中の少なくとも0.5×106〜1.5×106細胞/mLを播種することによって確立される、請求項1〜3、12、および37のいずれかに記載の方法。
- 36℃から31℃への温度変化をさらに含む、請求項12に記載の方法。
- 36℃から33℃への温度変化をさらに含む、請求項12に記載の方法。
- 前記温度変化は、前記増殖期と前記産生期との間の遷移時に生じる、請求項39または40に記載の方法。
- 前記温度変化は、前記産生期中に生じる、請求項39または40に記載の方法。
- 前記灌流は、交互接線流によって達成される、請求項1〜3および12のいずれかに記載の方法。
- 前記バイオリアクターは、少なくとも500Lの容量を有する、請求項1〜3および12のいずれかに記載の方法。
- 前記バイオリアクターは、少なくとも500L〜2000Lの容量を有する、請求項1〜3、12、および44のいずれかに記載の方法。
- 前記バイオリアクターは、少なくとも1000L〜2000Lの容量を有する、請求項1〜3、12、44、および45のいずれかに記載の方法。
- 前記哺乳類細胞は、チャイニーズハムスター卵巣(CHO)細胞である、請求項1〜3および12のいずれかに記載の方法。
- 前記組換えタンパク質は、ヒト抗体、ヒト化抗体、キメラ抗体、組換え融合タンパク質、またはサイトカインからなる群から選択される、請求項1〜3および12のいずれかに記載の方法。
- 前記細胞培養によって産生される前記組換えタンパク質を回収するステップをさらに含む、請求項1〜3および12のいずれかに記載の方法。
- 前記細胞培養によって産生される前記組換えタンパク質は、精製され、医薬として許容される製剤に製剤化される、請求項1〜3および12のいずれかに記載の方法。
- 前記哺乳類細胞培養物における組換えタンパク質産生は、前記細胞がL−アスパラギンによって誘導される細胞増殖停止に供されない培養物と比較して増加する、請求項2に記載の方法。
- 灌流が、細胞培養中、産生期に1日当たり0.25作業量から1日当たり1.0作業量に増加する速度で行われる、請求項1〜3のいずれかに記載の方法。
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