JP2016508376A - 組換えタンパク質産生の増加のための製剤及び方法 - Google Patents
組換えタンパク質産生の増加のための製剤及び方法 Download PDFInfo
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Abstract
Description
本出願は、「FORMULATIONS AND METHODS FOR INCREASED RECOMBINANT PROTEIN PRODUCTION」と題される2013年2月26日付で出願された米国仮特許出願番号第61/769,402号(代理人事件番号BHC125022US(BH−023/L))に由来する優先権を主張し、その全体が全ての目的について参照により本明細書に援用される。
上述のように、様々な実施形態において、細胞培養培地製剤中の組換えタンパク質の産生の増加は、製剤中のマンノースの濃度及び/又はカルシウム等の組換えタンパク質の安定化剤の濃度、又はそれらの両方の増加によって達成され得る。
(b)約3.5g/L未満のマンノース及び約1.5mM〜約9.5mMの範囲のカルシウム;
(c)約4g/L〜約5g/Lの範囲の少なくとも1種のマンノース、及び約1.5mM〜約9.5mMの範囲のカルシウム;
(d)約5g/Lの少なくとも1種のマンノース、及び約1.5mM〜約9.5mMの範囲のカルシウム;
(e)約4g/L〜約5g/Lの範囲のマンノース、及び約1.5mM未満又は約9.5mM超のカルシウム;
(f)約5g/Lのマンノース、及び約1.5mM未満又は約9.5mM超のカルシウム;
(g)約3.5g/L以上の少なくとも1種のマンノース、及び約2mM〜約5mMの範囲のカルシウム;
(h)約3.5g/L以上の少なくとも1種のマンノース、及び約5mMのカルシウム;
(i)約3.5g/L未満のマンノース、及び約2mM〜約5mMの範囲のカルシウム;
(j)約3.5g/L未満のマンノース、及び約5mMのカルシウム;及び/又は
(k)1:1の比率のDMEM/F12、及び約5g/Lの少なくとも1種のマンノース及び約5mMのカルシウム。
以下の図1〜図8を参照して細胞培養において組換えタンパク質を産生する方法をここに記載する。
[実施例1]:マンノースの増加は細胞培養系における組換えタンパク質の産生の増加をもたらした
rhFVIII発現BHK−21細胞を、既存のDMEM/F12培地成分の濃度へと変化してローラーチューブ(Shimoni et al.,BioPharm International 23(8):28−37(2010))で培養した。マンノースレベルを増加した場合にrhFVIII力価の増加(効力に関するアッセイにより特定された)が観察された。
rhFVIII発現BHK−21細胞をローラーチューブで培養した(Shimoni et al.,BioPharm International 23(8):28−37(2010))。rhFVIII力価の増加(効力に関するアッセイにより判定した)は、DMEM/F12系培地中のカルシウムレベルを増加した場合に観察された。
その後、実施例1〜2(15Lバイオリアクター、各培地型:A.5mMカルシウム;B.5g/Lマンノースを用いたおよそ2週間のキャンペーン)の凍結限外濾過した培養収集物を加工し、以前に記載された幾つかの工程においてFVIIIを精製し(Boedeker,Seminars in Thrombosis and Hemostasis 27(4):385−394(2001))、最後に様々な生成物の品質特性について査定した。5g/Lマンノース含有培地及び5mMカルシウム含有培地の両方から精製したrhFVIII材料は、HPLC−SEC及びSDS−PAGE/ウェスタンブロットに基づく方法によって査定される純度及び完全性、効力、特異的活性、様々な宿主細胞の不純物(タンパク質及び核酸)及びグリコシル化パターンを含む様々な生成物の品質特性に合格し、培地中のマンノース及びカルシウム濃度の変化はFVIII生成物に影響を及ぼさないことを示した。
図7A〜図7Bは、(5mM)カルシウムと(5g/L)マンノースの両方を濃縮したDMEM/F12系培地が、各成分単独よりもFVIII力価に対してより高い有利な効果を有したことを示す。また、これらの図は、力価の変化は1日以内に生じ、標準培地(1mM塩化カカルシウム及び3g/Lマンノースを含有する)に培養物を戻すと力価における約29%の増加がベースラインまで逆転したことから可逆的であったことを示す。
上記効果が灌流培地中で130日に亘って継続するキャンペーンで維持されることを確認するため、2つのバイオリアクターを同時に実行し、すなわち、一方は5g/Lマンノース及び5mMカルシウムを含有する試験培地中で培養し、もう一方は3g/Lマンノース及び1mMカルシウム対照培地中で培養した(図8A)。実際に30%超の力価の利益は、対照に対して試験バイオリアクターにおいて130日に亘る灌流キャンペーンで維持された(図8B)。
ローラーチューブ実験
以前に記載されるように(Shimoni et al.,BioPharm International,23(8):28−37(2010))小さいスケールの培地試験の実験を通気式のねじ蓋を有する50mL培養チューブ(Cultiflask 50、ニューヨーク州ボヘミアのSartorius)で行った。初期細胞密度3×105細胞/mLを含む14mLの試験培地でチューブを充填した。加湿した温度及びCO2制御インキュベータに置いた回転チューブプラットフォーム上で30rpmの回転運動でチューブを混合した。チューブを4日間インキュベートし、試料の1.3mLを代謝産物分析用に2日目、3日目及び4日目に採取した。凝集又は発色アッセイによる効力試験のため追加の試料を3日目及び4日目に採取した。
スケールアップのためrhFVIII発現BHK−21細胞を、産生培地(DMEM/F12系培地)を使用して振蕩フラスコ中に播種した。フラスコを35.5℃、30rpmでインキュベートし、所望量の細胞が存在するまで連続的に分裂させた。
12Lの作業体積で細胞培養を15Lバイオリアクター(カナダ、フォスターシティのApplikon Inc.)において細胞培養を行った。1×106細胞/mL以上の播種密度でバイオリアクターをインキュベートした。実行中、制御可能な加工パラメーターの標的設定点;pH=6.8、温度=35.5℃、溶解酸素DO=50%空気飽和を維持した。溶解酸素のための混合気体及びpH制御をシリコーン膜により上記培養物に供給し、陽圧を維持し、ストリッピングを補助するためヘッドスペースを手動ロタメーターにより制御した。収集ストリームから細胞を除去し、細胞の沈殿集団をバイオリアクターに戻すため、バイオリアクターを細胞保持装置(沈殿槽)に接続した。
バイオリアクター及び収集ストリームから試料を毎日採取した。細胞濃度、生存率及び大きさをCedex細胞カウンタ(ドイツのRoche Innovatis)で測定した。残留グルコース及びラクトース濃度をYSI 2700生化学アナライザ(米国のYSI Life Sciences)で測定した。バイオリアクターの気体及びpHをRapidLab 248血液ガスアナライザ(ドイツのSiemens)で測定した。バイオリアクター及び収集物の試料を1ステージ凝固又は発色アッセイ(以下に記載される)のいずれかによってrFVIII定量のため分析した。
FVIII:C凝固試験法は、活性化部分トロンボプラスチン時間(aPTT)に基づく1ステージアッセイである。第VIII因子は、第X因子から第Xa因子への酵素転換において、第IXa因子、カルシウム及びリン脂質の存在下で補因子として作用する。このアッセイでは、希釈した試験試料をFVIII欠損血漿基質及びaPTT試薬の混合物と共に37℃でインキュベートする。塩化カルシウムをインキュベートした混合物に添加し、凝固を開始する。凝固物を形成する所要時間(秒)とFVIII:Cの濃度の対数の間に逆相関が存在する。未知の試料に対する活性レベルは、様々な試験材料の希釈物の凝固時間と既知の活性の標準物質の一連の希釈物から構成される曲線との比較により内挿され、1mL当たりの国際単位(IU/mL)で報告される。
15Lの発酵物の収集液を濾過して細胞及びデブリを除去した後、100キロダルトン(kDa)カットオフ膜を使用するクロスフロー濾過により40倍に濃縮した。
固定化したモノクローナル抗体に対するrFVIIIの結合による免疫親和性クロマトグラフィーを含む一連のクロマトグラフィー工程、及びBoedeker,Seminars in Thrombosis and Hemostasis,27(4):385−394(2001)に記載されるイオン交換クロマトグラフィーにより限外濾過した材料からrFVIIIを精製した。
産生されるrhFVIIIタンパク質の品質を分析するため、一連の具体的な方法を適用した。FVIII生成物の品質を、完全性のあらゆる可能性のある変化、グリコシル化パターン、及び宿主細胞不純物について査定した。
これらの結果は、培養培地にマンノース及び/又はカルシウムを導入、及び/又はマンノース及び/又はカルシウム濃度を増加することによって、30%超の力価の増加を達成でき、その力価の増加は、継続的な灌流培養において130日超に亘り維持されることを実証する。重要なことには、生成物の品質特性(不純物を含む)も培養成績のいずれも培養培地への変化によって影響を受けない。力価の増加に対する観察された影響は、グルコースによって、例えば、マンノースを含まないDMEM/F12中のグルコース濃度を単に増加するだけでは再現されない。
Claims (24)
- 約3.5g/L以上のマンノース及び約1.5mM〜約9.5mMの範囲のカルシウムの少なくとも1つを含む哺乳動物の細胞培養培地製剤。
- 前記培地が約3.5g/L以上のマンノース、及び約1.5mM未満若しくは約9.5mM超のカルシウムを含む、請求項1に記載の製剤。
- 前記培地が約3.5g/L未満のマンノース、及び約1.5mM〜約9.5mMの範囲のカルシウムを含む、請求項1に記載の製剤。
- 前記培地が約4g/L〜約5g/Lの範囲のマンノースを含む、請求項1に記載の製剤。
- 前記培地が約4g/L〜約5g/Lの範囲のマンノースを含む、請求項2に記載の製剤。
- 前記培地が約2mM〜約5mMの範囲のカルシウムを含む、請求項1に記載の製剤。
- 前記培地が約2mM〜約5mMの範囲のカルシウムを含む請求項3に記載の製剤。
- 前記製剤が1:1の比率でDMEM/F12を含み、約4g/L〜約5g/Lの範囲のマンノース及び約2mM〜約5mMの範囲のカルシウムの少なくとも1つを含む、請求項1に記載の製剤。
- 細胞培養物中に組換えタンパク質を産生する方法であって、
組換えタンパク質発現細胞を供給すること、並びに
約3.5g/L以上のマンノース、及び約1.5mM〜約9.5mMの範囲のカルシウムの少なくとも1つを含む細胞培養培地において前記細胞を培養すること、
を含む前記方法。 - 前記培地が約3.5g/L以上のマンノース、及び約1.5mM未満又は約9.5mM超のカルシウムを含む、請求項9に記載の方法。
- 前記培地が約3.5g/L未満のマンノース、及び約1.5mM〜約9.5mMの範囲のカルシウムを含む、請求項9に記載の方法。
- 前記培地が約4g/L〜約5g/Lの範囲のマンノースを含む、請求項9に記載の方法。
- 前記培地が約4g/L〜約5g/Lの範囲のマンノースを含む、請求項10に記載の方法。
- 前記培地が約2mM〜約5mMの範囲のカルシウムを含む、請求項9に記載の方法。
- 前記培地が約2mM〜約5mMの範囲のカルシウムを含む、請求項11に記載の方法。
- 前記細胞が哺乳動物細胞である、請求項9に記載の方法。
- 前記哺乳動物細胞が、BHK細胞、CHO細胞、HKB細胞、HEK細胞、及びNS0細胞から選択される、請求項16に記載の方法。
- 前記哺乳動物細胞がBHK細胞である、請求項17に記載の方法。
- 前記細胞が血液凝固経路の組換えタンパク質を発現する、請求項9に記載の方法。
- 前記細胞が組換えヒト第VIII因子(rhFVIII)又はその変異体を発現する、請求項19に記載の方法。
- 変異体第VIII因子が遺伝子変異体である、請求項20に記載の方法。
- 前記遺伝子変異体がBドメイン欠失FVIIIである、請求項21に記載の方法。
- 前記変異体第VIII因子がペグ化FVIIIである、請求項20に記載の方法。
- 前記細胞が組換え第VIII因子発現BHK細胞であり、前記培地が1:1の比率でDMEM/F12を含み、約4g/L〜約5g/Lの範囲のマンノース及び約2mM〜約5mMの範囲のカルシウムの少なくとも1つを含む、請求項9に記載の方法。
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