JP2015509523A - Igaの富化方法 - Google Patents
Igaの富化方法 Download PDFInfo
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- JP2015509523A JP2015509523A JP2014560388A JP2014560388A JP2015509523A JP 2015509523 A JP2015509523 A JP 2015509523A JP 2014560388 A JP2014560388 A JP 2014560388A JP 2014560388 A JP2014560388 A JP 2014560388A JP 2015509523 A JP2015509523 A JP 2015509523A
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Classifications
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- C07K16/06—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies from serum
- C07K16/065—Purification, fragmentation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/26—Selective adsorption, e.g. chromatography characterised by the separation mechanism
- B01D15/36—Selective adsorption, e.g. chromatography characterised by the separation mechanism involving ionic interaction
- B01D15/361—Ion-exchange
- B01D15/363—Anion-exchange
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
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Abstract
Description
(a)IgAを結合させる条件下で陰イオン交換体上に組成物をロードする工程、
(b)2つ以上の酸基を有する物質を含むアルカリ性溶出溶液をアプライする工程を含み、
工程(b)中に溶出したタンパク質は単量体IgAが富化されている、IgAを含む組成物からIgAを富化する方法である。
IgAが富化されている。
(i)IgAを含む組成物をマクロ多孔質陰イオン交換樹脂にロードすること、
(ii)連続的で選択的な脱離/溶出後にIgAを交換樹脂から単離すること、
(iii)以下から成る連続溶出
A)IgG画分が得られる弱酸性から中性のpHでの前溶出工程
B)微アルカリ性pHでジカルボン酸もしくはジヒドロキシ−ジカルボン酸またはそれらの塩および/またはリン酸塩を使用し、単量体IgA40〜60%以上および最大でIgG60%までを含有する画分が得られる第1の溶出工程。この画分はIgMが枯渇している。
C)酸性pHでヒドロキシ−トリカルボン酸またはその塩、ベンゼンスルホン酸またはその塩、安息香酸またはその塩および硫酸水素イオンの塩またはそれらの混合物のいずれかを使用し、IgM約45%、IgA25%(大部分は二量体/多量体)、IgG25%および免疫グロブリン以外の夾雑物5%を含有する画分が得られる第2の溶出工程を特徴とする。
用語「IgAを含む組成物」は、IgAを含有する任意の液体組成物に関する。具体的には、この組成物は、唾液、涙液または粘液等の体液、例えば治療目的のためのIgG等の血漿タンパク質を精製するための血漿の処理中に得ることができる任意の血漿画分または副/廃棄物画分であることができる。本用語はまた、インビトロで生産されたIgAの組成物、例えばモノクローナルIgAまたは組換え生産されたIgA、例えば細胞株から分泌されたIgAも含む。
溶出緩衝液1として酒石酸塩緩衝液を使用する、陰イオン交換(AIEX)カラムからのIgAの連続溶出
血漿からのIgGの精製プロセスを、基本的には図1に示すようにおよび簡単に前述したように実行した。IgG精製プロセスでは、2種の緩衝液を使用して、即ち最初の2カラム容量(CV)では0.78Mの酢酸ナトリウムpH4.0±0.1、導電率8〜10mS/cmを使用し、続く8CVでは10mMの酢酸ナトリウムpH6.5±0.1、導電率0.8〜1.2mS/cmを使用して、AIEXカラム(MPHQ)を平衡化した。図2はAIEX原料組成物を示し、該AIEX原料組成物をAIEXカラムにロードし(樹脂1L当たりタンパク質約180g)、その後、平衡化緩衝液2 2CVで洗浄した。この工程後、AIEXカラムを連続溶出にかけた。
第1の溶出工程用の様々な緩衝液の試験
いくつかの異なる緩衝液を第1の溶出工程で評価し、酒石酸塩緩衝液の溶出プロファイルと比較した。
オクタン酸沈殿物由来のIgAの可溶化
図1に示すように、オクタン酸沈殿物(OAケーキ)は、IgG精製プロセス中に生じる別の廃棄物画分であった。この沈殿物は相当量のIgAを含有することが分かっており、従って、IgAの精製用の良好な出発材料であった。
単量体IgAのポリッシング
連続溶出により、夾雑物としてIgGを含有する、単量体IgAが富化された画分(F4)が得られた。親和性クロマトグラフィー(Ig選択)によるIgGの選択的除去によりポリッシング工程を実行した。
Claims (24)
- (a)IgAを結合させる条件下で陰イオン交換体上に組成物をロードする工程、
(b)2つ以上の酸基を有する物質を含むアルカリ性溶出溶液をアプライする工程、
(c)場合により、陰イオン交換体の強力な競合体を含む酸性溶出溶液をアプライする工程を含み、
工程(b)中に溶出したタンパク質は単量体IgAが富化されている、IgAを含む組成物からIgAを富化する方法。 - 工程(a)と工程(b)との間に、低導電率溶液を陰イオン交換体にアプライすることにより前溶出工程(a1)を実行する、請求項1に記載の方法。
- 工程(a1)を弱酸性/中性のpHで行なう、請求項2に記載の方法。
- 工程(b)での物質は、2つ以上のカルボキシル基を有する多価ヒドロキシ−カルボン酸もしくはその塩、および/またはリン酸塩から選択される、請求項1〜3のいずれかに記載の方法。
- 物質は、酒石酸/酒石酸塩、シュウ酸/シュウ酸塩、マロン酸/マロン酸塩およびマレイン酸/マレイン酸塩のようなジヒドロキシ−ジカルボン酸および/もしくはジカルボン酸またはそれらの塩、クエン酸/クエン酸塩のようなヒドロキシ−トリカルボン酸もしくはその塩、ならびに/またはリン酸塩から選択される、請求項4に記載の方法。
- ジヒドロキシ−ジカルボン酸またはその塩は、酒石酸/酒石酸塩、シュウ酸/シュウ酸塩、マロン酸/マロン酸塩およびマレイン酸/マレイン酸塩から選択される、請求項5に記載の方法。
- ジヒドロキシ−ジカルボン酸またはその塩は、酒石酸/酒石酸塩またはシュウ酸/シュウ酸塩である、請求項6に記載の方法。
- 工程(b)中に回収した溶出物は本質的にIgMを含まない、請求項1〜7のいずれかに記載の方法。
- 工程(c)中に溶出したタンパク質は二量体IgAが富化されている、請求項7に記載の方法。
- 工程(c)での陰イオン交換体の強力な競合体は、クエン酸/その塩、ベンゼンスルホン酸/その塩、安息香酸/その塩、および硫酸水素イオンの塩またはそれらの混合物から選択される、請求項1〜9のいずれかに記載の方法。
- 陰イオン交換体の強力な競合体はクエン酸塩である、請求項10に記載の方法。
- 陰イオン交換体は強陰イオン交換体または弱陰イオン交換体である、請求項1〜11のいずれかに記載の方法。
- 陰イオン交換体は、第四級アンモニウム、第四級アミノエチル、ジエチルアミノエチル、トリメチルアミノエチルまたはジメチルアミノエチルのような陰イオン交換リガンドを含む、請求項12に記載の方法。
- 陰イオン交換体は、MPHQ、DEAE Sepharose FF、Q Sepharose(HPおよびFF)、ANX Sepharose FF(低置換型および高置換型)、Capto Q、Capto Q XP、Capto DEAE、Capto ANX、Macro Cap Q、Source 30 Qおよび15 Q、Q Hyper Cel、Giga Cap Q 650M、QAE 550 C、DEAE Biogel A、Fractogel DEAE、Fragtogel、TMAEならびにFragtogel DMAEから選択される、請求項13に記載の方法。
- IgAを含む組成物は血液、血清、血漿または他の体液である、またはこれらに由来する、請求項1〜14のいずれかに記載の方法。
- IgAを含む組成物は、血漿分画の中間沈殿物の溶液、または血漿からのIgGの精製中に得られる副画分である、請求項15に記載の方法。
- IgAを含む組成物はIgG精製プロセスでの中間体であり、請求項1に記載の方法の工程(a)および工程(b)をIgG生産プロセスの一部である陰イオン交換体上で行なう、請求項15または請求項16に記載の方法。
- IgAを含む組成物を沈殿物の可溶化により得る、請求項15または請求項16に記載の方法。
- 沈殿物はIgG精製中に得られるオクタン酸沈殿物である、請求項18に記載の方法。
- 可溶化工程はIgAおよびIgGを選択的に溶液にする、請求項18または請求項19に記載の方法。
- 可溶化を、1〜15mS/cmの導電率および3.5〜6または7〜9.5のpHを有する溶液を使用して実行する、請求項19に記載の方法。
- 可溶化を、リン酸塩緩衝液、酢酸塩緩衝液、Tris緩衝液および/またはこれらの緩衝液の内の2つもしくはそれ以上の組み合わせにより実行する、請求項21に記載の方法。
- 緩衝液は、pH4.8である、0.22Mの酢酸塩緩衝液または0.15Mのリン酸塩緩衝液から選択される、請求項22に記載の方法。
- 連続溶出により単量体IgAと二量体IgAとを分離するための陰イオン交換クロマトグラフィーの使用。
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