JP6317739B2 - 短縮されたCD95−Fc変異体 - Google Patents
短縮されたCD95−Fc変異体 Download PDFInfo
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- JP6317739B2 JP6317739B2 JP2015522106A JP2015522106A JP6317739B2 JP 6317739 B2 JP6317739 B2 JP 6317739B2 JP 2015522106 A JP2015522106 A JP 2015522106A JP 2015522106 A JP2015522106 A JP 2015522106A JP 6317739 B2 JP6317739 B2 JP 6317739B2
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- fusion protein
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
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Description
(a)リン酸、好ましくは約20mM〜約100mMのリン酸、より好ましくは約30mM〜約70mMのリン酸、さらにより好ましくは約40mM〜約60mMのリン酸、最も好ましくは約50mMのリン酸、
(b)粘度増強剤、好ましくは約0.1〜10重量%の粘度増強剤、より好ましくは1〜8重量%の粘度増強剤、より好ましくは約3重量%〜約7重量%の粘度増強剤、さらにより好ましくは約6重量%〜約7重量%の粘度増強剤、および最も好ましくは約5重量%の粘度増強剤を含み、そして、
(c)4〜8の範囲のpH値を有する。
(a)細胞採取物を提供するフィードバッチ(feed batch)生産工程による、本発明により提供される組成物の生産、および、
(b)細胞採取物からの、本発明の組成物の分離。
継代培養、
50 lバイオリアクター、
200 lバイオリアクター、
1000 lバイオリアクター、
沈降、
深層
および0.2μm濾過。
(a)リン酸、好ましくは約20mM〜約100mMのリン酸、より好ましくは約50mMのリン酸、
(b)ソルビトールのような粘度増強剤、好ましくは約0.1〜10重量%の粘度増強剤、より好ましくは約5重量%の粘度増強剤を含むことができ、および/または、
(c)4〜8の範囲のpH値を有する。
(a)細胞採取物を提供するフェドバッチ(fed−batch)生産工程による、本発明に係る融合タンパク質の生産、
および、
(b)細胞採取物からの、本発明に係る融合タンパク質の分離。
本発明に係る組成物を生産する方法
本発明に係る組成物を生産する方法は、上記に定義した上流工程と下流工程とを含む。
APG101アイソフォームを含む組成物は、フェドバッチ培養で生産される。マスター細胞バンクMCB1AGAの2バイアルを解凍する。第三継代培養の生存能力は>90%でなければならず、生菌数は>1.5×106細胞/mLでなければならない。両方のバイアルがこれらの仕様を満たすならば、より高い生存能力を有する培養を第四継代培養およびシードリアクターの接種のために用いる。より低い生存能力を有する培養は、第三継代培養後に破棄する。第一のシードバイオリアクターに接種する前に、最大で合計≧4Lまでの容量の振とうフラスコ内で細胞培養を増殖させる。第一のシードバイオリアクターとして、50L Xcellerexディスポーザルバイオリアクター(XDR)を用いる。細胞培養は、第二のシードリアクター200L XDR内に移す前に、3日間培養する。さらに3日培養した後、1000Lの生産リアクターに接種する。採取工程は、13日目に、または、生存能力が61%未満に低下した場合はそれよりも早く、開始する。
使用されるマスター細胞バンク(MCB)を、「MCB1AGA」と称す。
2つのMCBの低温バイアルを継続的に蘇生する。その後、融解工程を各バイアルに適用する:36.8℃(設定値)のWFIを含むビーカー内で、小さい氷晶が残るまで低温バイアルを解凍する。それから、6mM L−グルタミン(終濃度)および50nM MTX(終濃度)で補充された、約10mLの冷却した(5±3℃)生育培地(培地番号3001772、PAAより購入)内に細胞を移す。残存するDMSOを除去するために、冷却した(5±3℃)培地中での洗浄ステップを、遠心分離を介して行なう。遠心分離ステップ後に、細胞ペレットを、50mLの予め温めた(36.8±1℃)培地中に再懸濁する。細胞濃度および生存能力を、Cedex細胞計測器を用いて測定する。最後に、このOut−of−Freeze培養液を、250ml振とうフラスコを用いて50mlの作業体積(working volume)で、振とうインキュベーター内でインキュベートする。
50Lシードバイオリアクターは、着床式磁気駆動アジテーターシステムおよび1mmスパージャディスクを具備する。接種の前に、50Lバイオリアクターを、6mM L−グルタミン(終濃度)で補充された約20Lの生育培地(培地番号3001772、PAAより購入)で満たす。これらのパラメーターを、培地の事前コンディショニングおよびシードトレイン(seed train)培養工程に適用する。
200Lシードバイオリアクターは、着床式磁気駆動アジテーターシステムおよび1mmスパージャディスクを具備する。接種の前に、200Lバイオリアクターを、6mM L−グルタミン(終濃度)で補充された、約100Lの生育培地(培地番号3001772、PAAより購入)で満たす。これらのパラメーターを、培地の事前コンディショニングおよびシードトレイン培養工程に適用する。
APG101アイソフォームを含む組成物の生産工程は、フェドバッチ培養である。1000Lの生産バイオリアクターは、着床式磁気駆動アジテーターシステムおよび1mmスパージャディスクを具備する。接種前に、1000Lバイオリアクターを、6mM L−グルタミン(終濃度、最終的な開始容量720Lで計算)で補充された約580Lの増殖培地(培地番号3001829、Becton Dickisonより購入)で満たす。工程パラメーターがその許容できる範囲内であるときに、シードバイオリアクターから生産バイオリアクターへの接種移行を開始する。生産バイオリアクター内の、接種後の標的細胞濃度は、720Lの全容量中、0.3*106生菌/mLである。シードバイオリアクター細胞培養液の必要容量を生産リアクターに移し、それから、720Lの開始容量に達成するまで増殖培地(培地番号3001829、Becton Dickisonより購入)で満たす。細胞培養は、3日目に開始するFeedmedium A(PM30728)、および、グルコースFeedmedium B(PM30729)を用いてフィードする。
サンプリング後の3日目に開始するボーラスフィード。
フィード速度3〜6日:5.184g/L/d(720Lの開始容量で計算)
フィード速度7〜12日:2.592g/L/d(720Lの開始容量で計算)
−Feedmedium A:
サンプリング後の3日目に開始するボーラスフィード。
フィード速度3〜5日:43.2g/L/d(720Lの開始容量で計算)
フィード速度6〜12日:21.6g/L/d(720Lの開始容量で計算)
−D−グルコースフィード:実際のD−グルコース濃度が<5g/Lになったときにグルコースを添加し、7日目に開始する。D−グルコース濃度は、必要量のD−グルコースフィードを添加することにより、5g/Lに調節する。
採取工程は、沈降ステップにより開始する。培養ブロスを、最終的に10±5℃までクールダウンする。温度が<20℃のときに、撹拌、pO2およびpH調節を止める。沈降の最短で12時間および最長で22時間後に、深層濾過を開始する。
PallからのStax(商標)Disposable Depth Filter Systemsを用いて、7×PDK5および2×PDD1デプスフィルターを装着して深層濾過を行なう。浄化の後に、0.2μm濾過を行なう。デプスフィルターに、流速≦100L/m2/hで約900LのPBSを流す。残存する液体を、空気でシステムの外に吹き飛ばす。濾過工程は、ポンプ流速≦3、5L/分および最大圧力1.0barで行なう。産物回収を増加させるために、フィルターをその後、約60LのPBS(pH7、25)でリンスし、加圧空気を用いて0.8barの最大圧力で吹き飛ばす。濾過した採取物を、壁のダクトを直接通ってGDスイート(suite)内に移し、1000L Mixtainer内に集めて室温で保管する。
説明目的のために、下流工程中のそれぞれの精製ステップの説明を以下に示す。
上記による濾過物質を、深層濾過(depth filtrated)(0.2μm)に移し、温度を5±3℃にした。工程の前に、採取物を4つの等量のアリコートに分けて室温で一晩保管し、21±3℃の最終的な工程温度に到達させた。採取の工程は、いかなる追加のコンディショニングもせずに、4サイクルで行なった。
プロテインA溶出液の回収直後に、5分以内に20mMクエン酸を固定容量(仕様:pH3.5±0.2)添加し、エンベロープウイルスを不活化した。得られたウイルス不活化溶液を、室温(21±3℃)で75±15分間、別々にインキュベートした。最終的に、固定容量の20mMクエン酸三ナトリウムの添加を介して不活化溶液のpHをpH5.0±0.2に調節して、ウイルス不活化を止めた。全体のコンディショニングスキームは以下のとおりであった:
ウイルス不活化、pH調節および濾過に続いて、コンディショニングしたウイルス不活化プールを、Capto Qカラムを用いてFTモードで2サイクル処理した。当該方法は、定置洗浄(cleaning in place)ステップ1(0.5M NaOHバッファー)、平衡化ステップ(20mMクエン酸ナトリウム、pH5)、コンディショニングしたウイルス不活化溶液のロードステップ、洗浄ステップ(20mMクエン酸ナトリウム、pH5.0)、再生ステップ(20mMクエン酸ナトリウム、1M NaCl、pH5.5)、定置洗浄ステップ2(0.5M NaOH)、および、保管ステップ(0.01M NaOH)を含む。
C20ステップの後、AIEXの産物プールを、Capto MMCカラムを用いて3サイクルで処理した。方法は、定置洗浄ステップ(0.5M NaOHバッファー)、平衡化ステップ(20mMクエン酸ナトリウム、pH5.0)、AIEX産物/洗浄を用いたロードステップ、洗浄ステップ(20mMクエン酸ナトリウム、pH5.0)、溶出ステップ(50mMリン酸ナトリウム、105mM NaCl、pH7.4)、再生ステップ(3M NaCl、pH11)、定置洗浄ステップ(0.5M NaOH)、コンディショニングステップ(50mMリン酸ナトリウム、105mM NaCl、pH7.4)、および、保管ステップ(20mMリン酸ナトリウム、20%エタノール、pH7.5)を含んだ。
C30ステップの後に、Capto MMC溶出液プール(1181mL)を、ウイルス濾過の前に、Durapore 0.1μmフィルター(Millipak 20)上を通過させた。ウイルス濾過は、0.8±0.1barの作動圧力で50mM PBS、pH7.4(Capto MMC溶出バッファー)を用いて平衡化されたPlanova 15Nウイルスフィルター(100cm2)上に0.1μm濾液(887mL)のアリコートをアプライして行なった。洗浄後の容量は、平衡化バッファーを用いて0.5mL/cm2であった。フィルター試験を、加圧空気のバブリングの検出に基づいたフィルター使用の前に行なった。濾液の流速は、工程の間、一定のままだった(ca.22L/m2*h)。
透析濾過の前に、I10濾液を、2つのPellicon 3 30 kDaカセットを用いて、AKTAクロスフローシステム上で25.0±2.0mgAPG101/mLのタンパク質濃度まで濃縮した。その後、透析濾過を行なって、バッファー系を以下のバッファーに変更した:
50mMリン酸ナトリウム、5%ソルビトール、pH6.5
被保持物フロー:450L/(m2*h)
TMP:1.2±0.1bar
終濃度の調節のために、規定容量(107mL)の製剤バッファー(50mMリン酸ナトリウム、5%ソルビトール、pH6.5)をUF/DF被保持物プールに添加した。A280により得られた最終的な薬剤物質の濃度は20.4mg/mLであった。最終的に、薬剤物質を0.22μmで濾過した(Sartobran P)。続いて、薬剤物質の200μL容量アリコートを500μLバイアル内に詰めた。
ステップおよびProA−HPLCおよびA280分析により得られた全収率を表1に示す。標的分子のサンプリングは、収率の計算に考慮しなかった。
表2に、糖構造の分析を要約する。参照物質と本発明の組成物は同等の糖構造であるにもかかわらず、糖構造の分布は異なる。
本発明の組成物のAPG101のモルあたりのシアル酸の量の分析を表3に要約する。
Jurkat A3永久T細胞株を用いた細胞アッセイを、APG101の生物学的活性の決定のために用いた。この有効性を図5に模式的に示す。
・高い特異性。CD95との、その相互作用を介して、CD95L−T4は、JurkatA3細胞に対してアポトーシスを誘導する。APG101の添加により、CD95/CD95L−T4相互作用が特異的にブロックされる。
・関連のある細胞系の使用;アポトーシスの誘導は、CD95/CD95Lシグナル伝達の1つの重要な生理学的特徴であり、特徴がはっきりしたヒトT−細胞株Jurkat A3において観察することができる。
・96ウェルマイクロタイタープレートの適用に起因する高いサンプルスループットおよび短いインキュベーション時間。
背景:
Sypro Orangeなどの環境感受性の色素が、Thermofluor法と呼ばれる方法により、温度シフトアッセイでのタンパク質アンフォールディングの検出に用いられている。その方法では、色素は、部分的または全体的なタンパク質アンフォールディングにより生じる露出した疎水性領域と相互作用する。
試験するタンパク質およびSypro Orangeを、48ウェルプレート(ロー、白、BioRad、カタログ番号MLL4851)中のFlat Cap Strips(BioRad、カタログ番号TCS0803)にピペットした。25μlの最終容量中、試験するタンパク質の濃度は500μg/mlであり(PBS、pH7.4で薄めた)、Sypro Orange(Invitrogen、カタログ番号S6650)に関して1:1000であった。サイクラー(BioRad MiniOpticon)を以下のとおりに運転した:25℃で2分、それから、プレートを読んだ;10秒ごとに1℃上昇させて、1℃上昇するごとにプレートを読みながら、25℃から95℃まで。
図8に見ることができるように、CD95−Fcのトランケート型(APG101)は、本質的に同一の融点Tmにより示されるように(表4)、CD95−Fcと比較して、同等の安定性を有する。
Claims (8)
- (i)少なくとも1つの、N末がトランケートされた細胞外CD95ドメインの機能性フラグメント、および、(ii)少なくとも1つのFcドメインまたはその機能性フラグメントを含む、
融合タンパク質であって、
前記(i)のN末がトランケートされた細胞外CD95ドメインの機能性フラグメントは、配列番号11または配列番号12のアミノ酸配列、または、配列番号11または配列番号12に対して少なくとも97%の同一性を有する配列からなり、
前記(ii)の少なくとも1つのFcドメインはヒトFcドメインであり、配列番号8のアミノ酸配列、または、配列番号8に対して少なくとも97%の同一性を有する配列からなり、
前記の細胞外CD95ドメインまたはその機能性フラグメントが、前記の少なくとも1つのFcドメインまたはその機能性フラグメントのN末に位置し、前記の細胞外CD95ドメインまたはその機能性フラグメントが、前記Fcドメインまたはその機能性フラグメントに直接融合している、
融合タンパク質。 - 請求項1に記載の融合タンパク質であって、
前記N末がトランケートされた細胞外CD95ドメインの機能性フラグメントは、配列番号11または配列番号12のアミノ酸配列からなる、
融合タンパク質。 - 請求項1または2に記載の融合タンパク質であって、
前記融合タンパク質はシグナルペプチドがない、または、
前記融合タンパク質はN末に位置するシグナルペプチドを含む、
融合タンパク質。 - 請求項3に記載の融合タンパク質であって、
前記のN末に位置するシグナルペプチドが、自然発生のCD95シグナルペプチドまたは人工シグナルペプチドである、
融合タンパク質。 - 請求項1に記載の融合タンパク質であって、
前記融合タンパク質が、配列番号5または配列番号6からなる、
融合タンパク質。 - 請求項1から5のいずれか一項に記載の融合タンパク質をコードする、
核酸分子。 - 請求項6の核酸分子を含む、宿主細胞。
- 請求項1から5のいずれかに記載の融合タンパク質または請求項6に記載の核酸分子を含む、製剤であって、
20mM〜100mMのリン酸、および、
ソルビトール、アルギン酸、カルボキシメチルセルロース、デキストリン、ゼラチン、グアーガム、ヒドロキシエチルセルロース、ケイ酸マグネシウムアルミニウム、ポリビニルアルコール、ポリエチレンオキシド、二酸化ケイ素、スターチ、キサンタンガムからなる群から選択される粘度増強剤をさらに含み、および、
4〜8の範囲のpH値を有する、
ことを特徴とする、
製剤。
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