JP6502505B2 - 組換え糖タンパク質のグリコシル化の調節方法 - Google Patents
組換え糖タンパク質のグリコシル化の調節方法 Download PDFInfo
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- JP6502505B2 JP6502505B2 JP2017535399A JP2017535399A JP6502505B2 JP 6502505 B2 JP6502505 B2 JP 6502505B2 JP 2017535399 A JP2017535399 A JP 2017535399A JP 2017535399 A JP2017535399 A JP 2017535399A JP 6502505 B2 JP6502505 B2 JP 6502505B2
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Description
1−1.ベクターの製造
制限酵素(Restriction enzyme)の処理、プラスミドDNAの精製、DNA切片の接合及び大腸菌の形質転換などの分子生物学で一般的に使用されている方法は、SambrookなどのMolecular Cloning(第2版)で紹介された方法に最小限の変形を加え実施した。
利用してヒトp75 TNF受容体(TNFR)遺伝子をクローニングし、これをヒトIgG1のFc領域と融合してTNFR-IgG1を得た。これを利用してpTOP-BA-RL-pAベクター(大韓民国公開特許第10-2012-0059222号; 「CMVe」、「CB」、及び「β-アクチンイントロン」を持っている)を鋳型とし、図1の切断地図のようにpCUCBin-mSig-TNFceptベクターを製造した。
CHO/dhfr-(CHO DXB11)を母細胞に使用した。CHO/dhfr-はチャイニーズハムスター の卵巣細胞から分離された後、突然変異を介してジヒドロ葉酸還元酵素(Dihydrofolate Reductase、DHFR)遺伝子が欠乏された細胞である。
P75 TNF受容体(TNFR)遺伝子が含まれた前記pCUCBin-mSig-TNFceptベクターとCHO/dhfr-(CHO DXB11)を利用して形質転換された細胞を作成しMTX濃度を利用して遺伝子を増幅させた。このうち基準を満たす候補を選んで、モノクローナルであるかどうかを評価した後、生産用細胞株として選択した。その後、前記細胞株をガラス瓶に入れ、液体窒素で保管した。
培養に使用される培地は、培養段階に応じて別に使用した。培地X011SB(Merck Millipore、Cat. No. 102443)5.8g/Lにインスリンを添加した基本培地に、種培養段階(Seed Cultivation Phase)では無水グルコース(Sigma)10g/L及びL-グルタミン、グリシン、セリン(Sigma)をそれぞれ0.584g/L添加した培地(Media EC-SI)を使用し、成長段階(Growth Phase)では無水グルコース5g/L及びL-グルタミン、グリシン、セリンをそれぞれ0.584g/Lを添加した培地(EC-GM)を使用し、生産段階(production Phase)では無水グルコース15g/L及びL-グルタミン、グリシン、セリンをそれぞ0.584g/Lを添加した培地(EC-PM)を使用した。
3-1.O-グリカン含量分析
実施例2で精製された試料は、25mMリン酸ナトリウム、pH 6.3バッファーで希釈して1.0mg/mL濃度の100μLになるように準備した。各試料にN-グリコシダーゼF(Glycosidase F; 1U /μL、Roche)4μLとノイラミニダーゼ(Neuraminidase; 1U / 100μL、Roche)1μL、トリプシン(Trypsin; 1mg / mL、Promega)2μLを添加して、37℃で18時間反応させLC-MS分析を行った。
前記試料を80μL注入し、C18 RPカラム(4.6 mm×250 mm、5μm、300オングストローム;
Vydac、Cat. No. 218TP54)を使用してトリプシン分解ペプチド(Tryptic Peptide)を分析した。移動相Aは、水中0.1%TFA、移動相Bは80%COLD ACN中0.1%TFAを利用し、グラジエント条件で150分間分析した。UV検出器(detector)を利用して、215nmでペプチドを検出し、LCを通過して出てきた物質は、質量分析計(Mass spectrometry; LTQ XL、Thermo)に結合してMS分析を実行しO-グリコペプチドの相対面積比(Relative Area、%)を計算した。
実施例2で精製された試料と標準品(エタネルセプト、Pfizer)をそれぞれ3.0mg/mLになるように試料希釈液(25mM リン酸ナトリウム、pH 6.3バッファー)で希釈し準備した。各試料100μLとN-グリコシダーゼ F溶液6μLとを混合して37℃で20時間反応させた。反応が終わった溶液にエタノール400μLを添加してボルテックスした。これを遠心分離した後、上清液だけを取ってエッペンドルフチューブに移し込めて、speed-Vacコンセントレータを利用して、溶液を完全に乾燥させた。乾燥させた試料に2-AA標識剤を10μL加え混合した。45℃で反応させた後、常温で冷した。
前記実施例2の製造段階でインスリンを除いては、同じ培地で細胞株を培養した後、培養温度別のN-グリカンの含量(%)及びO-グリコペプチドの相対面積比(%)を分析し、下記表1に示した。
前記実施例2の製造段階でインスリンの添加有無に応じて糖タンパク質の糖鎖パターンを比較して表2に示した。
Claims (12)
- 組換え糖タンパク質をコードするポリヌクレオチドを含む宿主細胞をインスリンを含む培地で培養する段階を含む、組換え糖タンパク質のN-グリカン及び/又はO-グリカンの含量を減少させる方法であって、前記インスリンが、組換え糖タンパク質のN-グリカン及び/又はO-グリカンの含量を減少させるのに十分な濃度で培地中に含まれるものである、方法。
- 前記組換え糖タンパク質が、免疫グロブリン融合タンパク質である、請求項1に記載の方法。
- 前記組換え糖タンパク質が、TNFR-Fc融合タンパク質である、請求項1に記載の方法。
- 前記インスリンの濃度が、全体培地体積に対して0.0001mg/L〜1g/Lである、請求項1に記載の方法。
- 前記インスリンが、組換え糖タンパク質のN-結合グリコシル化(N-linked glycosylation)及びO-結合グリコシル化(O-linked glycosylation)を調節するものである、請求項1に記載の方法。
- 前記培養が、灌流培養である、請求項1に記載の方法。
- (a)培養培地で組換え糖タンパク質をコードするポリヌクレオチドを含む宿主細胞を培養して成長させる成長段階;及び
(b)前記培地にインスリンを添加して培養して糖タンパク質を生産する生産段階を含む、組換え糖タンパク質のN-グリカン及び/又はO-グリカンの含量を減少させる方法であって、前記インスリンが、組換え糖タンパク質のN-グリカン及び/又はO-グリカンの含量を減少させるのに十分な濃度で培地中に含まれるものである、方法。 - 前記(b)の生産段階が、目的とする糖鎖パターンに応じてインスリン濃度を相異して添加する、請求項7に記載の方法。
- 前記組換え糖タンパク質が、免疫グロブリン融合タンパク質である、請求項7に記載の方法。
- 前記組換え糖タンパク質が、TNFR-Fc融合タンパク質である、請求項7に記載の方法。
- 前記インスリンの濃度が、全体培地体積に対して0.0001mg/L〜1g/Lである、請求項7に記載の方法。
- 前記培養が、灌流培養である、請求項7に記載の方法。
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KR10-2014-0195976 | 2014-12-31 | ||
PCT/KR2015/014512 WO2016108638A1 (ko) | 2014-12-31 | 2015-12-30 | 재조합 당단백질의 글리코실화 조절 방법 |
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MX2017008634A (es) | 2018-04-26 |
SA517381863B1 (ar) | 2020-06-23 |
EP3241908A4 (en) | 2018-06-20 |
IL253217B (en) | 2022-08-01 |
US10131891B2 (en) | 2018-11-20 |
KR20160081699A (ko) | 2016-07-08 |
AU2015372704B2 (en) | 2018-09-20 |
EP3241908A1 (en) | 2017-11-08 |
BR112017014252A2 (pt) | 2018-01-02 |
RU2670889C9 (ru) | 2018-12-11 |
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IL253217A0 (en) | 2017-08-31 |
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