JP2013535185A - 生産細胞株 - Google Patents
生産細胞株 Download PDFInfo
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- JP2013535185A JP2013535185A JP2013517340A JP2013517340A JP2013535185A JP 2013535185 A JP2013535185 A JP 2013535185A JP 2013517340 A JP2013517340 A JP 2013517340A JP 2013517340 A JP2013517340 A JP 2013517340A JP 2013535185 A JP2013535185 A JP 2013535185A
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Abstract
【選択図】なし
Description
P=A.qP
QP=P/(V.t)
− 前培養期において細胞周期のG2+M期を特異的に延長させ、そして、
− 前培養期の後の生産期において前記POIを産生させることを含む方法である。
a)細胞周期のG2+M期が特異的に延長されるように真核生産細胞株を遺伝的に改変することと、
b)前記生産細胞株を培養することと、
c)POIを含有する細胞培養物の画分を回収することとを含む、細胞培養物における組み換え型POIの産生の収量を増加させる方法が提供される。
a)細胞周期のG2+M期が特異的に延長されるように真核生産細胞株を遺伝的に改変することと、
b)前培養期において前記生産細胞株を培養して、細胞周期のG2+M期が延長されている定常状態の細胞培養物を得ることと、
c)前記前培養期の後の生産期において、前記定常状態の細胞培養物を培養してPOIを産生させることと、
c)前記POIを含有する前記細胞培養物の画分を回収することとを含む。
a)細胞周期のG2+M期が特異的に延長されるように真核生産細胞株を遺伝的に改変することと、
b)前記生産細胞株を培養することと、
c)POIを含有する細胞培養物の画分を回収することとを含む、細胞培養物における組み換え型POIの産生の収量を増加させる方法を提供する。
様々な比増殖速度でP.パストリス細胞を分析するために、前記細胞を、0.01h−1〜0.21h−1の希釈速度範囲でケモスタット培養にて増殖させた。ケモスタット培養は、回分培養で始め、回分培養で終えた。各希釈速度を少なくとも5滞留時間維持した後、サンプルを採取してバイオマス乾燥重量、Fab断片濃度、及び細胞周期分布を決定した。
a)共過剰発現プラスミドの構築
既に異種タンパク質を発現している株においてP.パストリスのCLB2遺伝子の共過剰発現に適したプラスミドを作製するために、P.パストリスのcDNAライブラリからPCRによってCLB2遺伝子を増幅した。テンプレートにコードされていないP.パストリスのKozak配列、並びにSbfI及びSfiIの制限酵素部位を、それぞれフォワード(5’−GATCCACCTGCAGGCCATGTCTAATGTTCAGCCTAACGA−3’、配列番号1)及びバックワード(5’−TCGGCCGAGGCGGCCCTACAAAATTGGATCCATGATGC−3’配列番号2)オリゴヌクレオチドプライマーを用いて付加した。SbfI及びSfiIで処理されたPCR産物をpPuzzleKanRにクローニングした(SbfI及びSfiIで切断し、アルカリホスファターゼで処理した)。
実施例2の工程a)に記載したクローニング手順により得られたプラスミドpPuzzleKanR−CLB2を用いて、GAPプロモータの管理下における組み換え型ヒト抗体Fab断片3H6の高レベル発現について予め選択されているP.パストリスの株を形質転換した(Dragositsら.2009年,J Proteome Res.2009 Mar;8(3):1380−92)。Fab断片遺伝子はゼオシン耐性に基づいて、ヘルパー因子遺伝子はジェネテシン耐性に基づいて選択した。
a)他の細胞周期制御因子を過剰発現させるために、CLB2の代わりに所望の細胞周期制御因子遺伝子を増幅し、クローニングしたことを除いて、実施例2.aに記載の通り発現ベクターを構築した。このようにして、S.セレヴィシエのMAD2及びPDS1、並びにP.パストリスのRRP42をpPuzzleKanRにクローニングして、pPuzzleKanR−MAD2、pPuzzleKanR−PDS1、及びpPuzzleKanR−RRP42を構築した。
約350bp長の細胞周期制御因子遺伝子の2つの断片をPCRによって増幅し、kanMX4マーカーカセットの両端にクローニングして、G418に対する耐性を付与した。P.パストリスを形質転換し、G418耐性について選択した後、細胞周期制御因子遺伝子の一部の欠失をPCRによって確認する。
50mLのチューブ内にて、2.5mLのYPD(20g/Lの大豆ペプトン(HY QUEST)、10g/Lの酵母抽出物、20g/Lのグルコース、pH7.4)中のCLB2過剰発現株の前培養物に、プレートから細胞を接種した。次の日、本培養物(50mLのチューブ内の10mLの合成振盪フラスコ培地)を全て、0.1のOD600で接種した。ddH2O1000mL当たり、本培養培地:(22gのクエン酸一水和物、22gのグルコース一水和物、3.15gの(NH4)2HPO4、0.492gのMgSO4・7H2O、0.8040gのKCl、0.0268gのCaCl2・2H2O、1.47mLの微量金属溶液(PTM1)及び2.0mLのビオチン溶液(0.2gL−1)を溶解させた。KOH25%を用いてpHを5に調整し、次いで、滅菌濾過した。
振盪フラスコ培養において24時間後の対数増殖期中に、エタノール固定細胞のサンプルを採取し、実施例1に記載の通りDNA染色及びフローサイトメトリー分析のために処理した。細胞周期の期の分布を以下の表に示す。
回分培養が終わった後、PpCLB2及び対照株についてケモスタット培養を開始した。少なくとも3滞留時間の間各希釈速度を維持した。酵母の乾燥質量、Fab3H6の力価、及び比生産性を表1に要約し、比生産性対比増殖速度を図3に示す。
容積生産性の理論的最大値QPを用いて流加生産プロセスをシミュレートするために、ケモスタットサンプルから得られたデータを用いてμの関数としてqPを計算した(Maurerら.2006年 Microb.Cell Fact.)。最適化された発酵ストラテジは、計算された増殖動態を実施するための異なる期からなっていた。回分期の後、急速にバイオマスを生産のための0.15h−1の増殖速度の対数フィード期(それぞれ8時間又は5時間)を経て、プロセスの最後までμを減速させる(それぞれ、更に8時間又は22時間)。プロセスは、バイオマスが100gL−1に達し、QPが最適化されているように設計された。
細胞のサイズ又は生存を測定するために、サンプルをPBSで希釈し、BD FACS Calibur(商標)フローサイトメーターで直接獲得し、BD CellQuest(商標)ソフトウェアで分析した。
500μLのエタノール中における数μLの高密度流加培養物は、更なるサンプル処理に十分であったが、1mL以下の低密度振盪フラスコ培養物を遠心分離によりペレット化し、等容積の氷冷エタノールを滴下することにより再懸濁させた。全ての場合において、細胞をPBSで2回洗浄してエタノールを除去し、1時間RNaseA(35U mL−1)と共にインキュベートしてdsRNAを分解し、再度PBSで2回洗浄しなければならなかった。次いで、細胞を含む溶液をFACSチューブに移し、3秒間1バーストで超音波処理して細胞の塊を破壊した後、等容積のPI溶液(PBS中1:100)と混合した。短時間ボルテックスした後、細胞を測定する準備が整った。サンプルは、理想的には、1mL当たり1×106細胞又は粒子を含有していなければならない。
Claims (14)
- 細胞培養物において組み換え型の対象ポリペプチド(POI)を産生させる方法であって、真核細胞株を遺伝的に改変して、
− 前培養期において細胞周期のG2+M期を特異的に延長させ、そして、
− 前培養期の後の生産期において前記POIを産生させることを含む方法。 - 細胞株が、細胞周期の調節因子を発現させるために発現カセットがそのゲノム中に安定的に組み込まれている細胞株である請求項1に記載の方法。
- 細胞株が、好ましくは、細胞周期制御因子を特異的に過剰発現させるか、活性化するか、突然変異させるか、下方調節するか、欠損させるか、分解するか、阻害することによって、細胞周期制御因子を調節するように改変されている請求項1又は2に記載の方法。
- 細胞周期制御因子が、サイクリン依存性キナーゼ(Cdk)、G1特異的サイクリン、G2/有系分裂特異的サイクリン等のCdk/サイクリン複合体、及び例えばClb2、Clb1、Clb3−6、Cln1−3、Cdc6、Cdc14、Cdc20、Cdc28、Cdc48、Cdh1、Kar1、Mad2、MBF、Mcm1、Pds1、Rrp42、SBF、Sic1、Swe1、Swi5、Whi2等のこれらの転写因子又は分解因子からなる群より選択される請求項3に記載の方法。
- 細胞株が、細胞周期の調節因子及びPOIを産生するように改変されているワイルドカードホスト細胞株又はプロデューサー細胞株である請求項1〜4のいずれかに記載の方法。
- POIが、免疫グロブリン又は血清アルブミン等の血清タンパク質、酵素、ホルモン、シグナリング分子、マトリクスタンパク質、これらの断片若しくは誘導体、又はホスト細胞の代謝産物の産生を媒介するポリペプチドからなる群より選択される請求項1〜5のいずれかに記載の方法。
- 細胞が、真菌細胞、好ましくはピキア属の細胞等の酵母細胞、特にP.パストリスの株であるか、又は高等真核細胞、好ましくは哺乳類若しくは植物の細胞である請求項1〜6のいずれかに記載の方法。
- POIを産生するための少なくとも0.1μg/(g・h)の比生産性qPを有する請求項1〜7のいずれかに記載の方法によって得ることができる高プロデューサー細胞株。
- 細胞のうちの少なくとも50%が、フィード時間のうちの少なくとも50%であるプロセス時間にわたってG2+M期にある請求項1〜7のいずれかに記載の方法によって得ることができる細胞株の高プロデューサー細胞培養物。
- 少なくとも10時間にわたって定常状態である請求項9に記載の細胞培養物。
- 流加細胞培養物又は連続細胞培養物である請求項9又は10に記載の細胞培養物。
- 工業的規模で少なくとも0.1μg/(L・h)の容積生産性QPを有する請求項9〜11のいずれかに記載の細胞培養物。
- a)細胞周期のG2+M期が特異的に延長されるように真核生産細胞株を遺伝的に改変することと、
b)前培養期において前記生産細胞株を培養して、細胞周期のG2+M期が延長されている定常状態の細胞培養物を得ることと、
c)前記前培養期の後の生産期において、前記定常状態の細胞培養物を培養してPOIを産生させることと、
c)前記POIを含有する前記細胞培養物の画分を回収することとを含む細胞培養物における組み換え型POIの産生の収量を増加させる方法。 - 細胞周期のG2+M期が特異的に延長されるように細胞株を遺伝的に改変することを含む細胞培養物における真核生産細胞株の組み換え型POI生産期を延長する方法。
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2020515261A (ja) * | 2017-03-29 | 2020-05-28 | ベーリンガー インゲルハイム エルツェーファウ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディトゲゼルシャフト | 改変された膜脂質組成を有するリコンビナントホスト細胞 |
US11479798B2 (en) | 2017-03-29 | 2022-10-25 | Boehringer Ingelheim Rcv Gmbh & Co Kg | Recombinant host cell with altered membrane lipid composition |
JP7189145B2 (ja) | 2017-03-29 | 2022-12-13 | ベーリンガー インゲルハイム エルツェーファウ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディトゲゼルシャフト | 改変された膜脂質組成を有するリコンビナントホスト細胞 |
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EP2591121A1 (en) | 2013-05-15 |
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JP5997140B2 (ja) | 2016-09-28 |
BR112013000219A2 (pt) | 2020-08-04 |
EP2591121B1 (en) | 2018-01-24 |
US20130137141A1 (en) | 2013-05-30 |
CA2803719A1 (en) | 2012-01-12 |
CN103097542A (zh) | 2013-05-08 |
ES2661788T3 (es) | 2018-04-04 |
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