JP5078990B2 - グリコシル化抗体 - Google Patents
グリコシル化抗体 Download PDFInfo
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- JP5078990B2 JP5078990B2 JP2009504627A JP2009504627A JP5078990B2 JP 5078990 B2 JP5078990 B2 JP 5078990B2 JP 2009504627 A JP2009504627 A JP 2009504627A JP 2009504627 A JP2009504627 A JP 2009504627A JP 5078990 B2 JP5078990 B2 JP 5078990B2
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- C07K16/2863—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for growth factors, growth regulators
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Description
天然型における免疫グロブリンまたは抗体は、通常2つの軽鎖および2つの重鎖から構成される四量体の糖タンパク質である。抗体は、IgA、IgD、IgE、IgM、およびIgGのような異なるクラスに、およびIgG1、IgG2、IgG3、およびIgG4のようないくつかのサブクラスに抗体を割り当てる定常ドメインを含む。IgG1およびIgG3クラスのヒト抗体は、通常ADCC(抗体依存性細胞障害)を媒介する。
本発明は、Asn297において糖鎖でグリコシル化されているヒトのIgG1型またはIgG3型の抗体であり、該糖鎖のフコース量が少なくとも99%であり、さらにNGNAの量が1%もしくはそれ未満であり、かつ/またはN末端のα-1,3-ガラクトース量が1%もしくはそれ未満であることを特徴とする該抗体を含む。
[本発明101]
Asn297において糖鎖でグリコシル化されているヒトIgG1型またはIgG3型の抗体であって、該糖鎖内のフコース量が少なくとも99%であり、さらにNGNA量が1%またはそれ未満であり、かつ/またはN末端α1,3ガラクトース量が1%またはそれ未満であることを特徴とする、抗体。
[本発明102]
NGNA量が0.5%またはそれ未満であることを特徴とする、本発明101の抗体。
[本発明103]
N末端α1,3ガラクトース量が0.5%またはそれ未満であることを特徴とする、本発明101または102の抗体。
[本発明104]
抗体が、キメラ抗体、ヒト化抗体、またはヒト抗体であることを特徴とする、本発明101〜103のいずれかの抗体。
[本発明105]
Asn297において糖鎖でグリコシル化されているヒトIgG1型またはIgG3型の抗体を組換えによって発現することができるCHO細胞であって、該抗体が、該糖鎖内でフコース量が少なくとも99%であり、さらにNGNA量が1%またはそれ未満であり、かつ/またはN末端α1,3ガラクトース量が1%またはそれ未満であることを特徴とする、CHO細胞。
[本発明106]
2つのDHFR対立遺伝子の欠失を含むことを特徴とする、本発明105のCHO細胞。
[本発明107]
CHO細胞株DSM ACC 2795。
[本発明108]
ヒト医学療法における、本発明101〜105のいずれかの抗体の使用。
[本発明109]
医用薬剤の製造のための、本発明101〜105のいずれかの抗体の使用。
[本発明110]
T細胞による疾患、自己免疫疾患、感染症、癌疾患の治療のための免疫抑制用の医用薬剤の製造のための、本発明101〜105のいずれかの抗体の使用。
[本発明111]
本発明101〜105のいずれかの抗体を含む、薬学的組成物。
[本発明112]
DHFR選択圧下で、IgG1抗体またはIgG3抗体を形質移入したCHO細胞を培養する段階、単一クローンを選び、このクローンを拡大する段階、および本発明に係るグリコシル化パターンを有する抗体を生成するクローンを選択する段階
を含む、Asn297において糖鎖でグリコシル化されているヒトIgG1型またはIgG3型のモノクローナル抗体の組換え生成のためのCHO細胞の選択方法であって、
該抗体が、該糖鎖内のフコース量が少なくとも99%であり、さらに、NGNA量が1%またはそれ未満であり、かつ/またはN末端α1,3ガラクトース量が1%またはそれ未満であることを特徴とする、方法。
[本発明113]
モノクローナル抗体の組換え生成のための、本発明105〜107のいずれかのCHO細胞の使用。
[本発明114]
本発明105〜107のいずれかのCHO細胞における、モノクローナル抗体の組換え生成のための方法。
抗体は、重鎖定常領域における保存位置に炭化水素構造を含み、各アイソタイプが、タンパク質の構築、分泌または機能的活性に可変的に影響を及ぼすN結合炭化水素構造の異なるアレイを保有する(Wright, A., and Morrison, S.L., Trends Biotechnol. 15 (1997) 26-32)。付着型N結合炭化水素構造は、プロセシングの程度に依存してかなり変化し、かつ高マンノース、多分岐複合オリゴ糖ならびに二分岐複合オリゴ糖を含むことができる(Wright, A., and Morrison, S. L., Trends Biotechnol. 15 (1997) 26-32)。
細胞株
組換えIgG発現のための細胞株の作製に用いられる親細胞株は、チャイニーズハムスター卵巣(CHO)細胞株、CHO-DG44である(Flintoff, W.F. et al., Somat. Cell Genet. 2 (1976) 245-261; Flintoff, W.F. et al., Mol. Cell. Biol. 2 (1982) 275-285; Urlaub, G. et al., Cell 33 (1983) 405-412;Urlaub. G. et al., Somat. Cell Mol. Genet. 12 (1986) 555-566)。CHO-DG44細胞は、酵素であるジヒドロ葉酸還元酵素(DHFR)の内因性の両遺伝子座を喪失している。
発現システムは、CMVプロモーターを含んだ。この発現システムは表1に記載される。抗体として、IGF-1R(国際公開公報第2005005635号;AK18またはAK22)に対する抗体を用いた。
形質移入および選択
発現プラスミドの形質移入は、Fugene(Roche Diagnostics GmbH)を用いて行った。形質移入の1日後に、DG44細胞は、MEM alpha Minus Medium、10% 透析済みFCSおよび2mmol/L L-グルタミンおよび20nM メトトレキセート(MTX)からなる選択圧下に置いた。選択圧下3週間後に、単一クローンをプレートから選び、拡大した。
培養および生成
3×105細胞/mlを30mlの培地で満たした125mL 攪拌フラスコ(Corning)中で37℃、5% CO2、100rpmにおいて10日間増殖させた。細胞密度をCASYカウンターによって測定し、上清をプロテインAアフィニティークロマトグラフィーによって抗体濃度の測定のために採取した。約20mlの各上清をプロテインAクロマトグラフィーによってさらなる生化学的検討のために精製した(PBSで平衡化、25mM クエン酸ナトリウム緩衝液 pH5.2で洗浄、100mM クエン酸ナトリウム緩衝液 pH2.8で溶出、10mM NaOHでCIP)。
抗体の糖構造(glycostructure)分析
精製された抗体材料を液体クロマトグラフィー/質量分析(LCMS)ペプチドマップ解析によって分析した。試料を、還元し(0.4M TRIS/HCl、8M グアニジン/HCl、pH 8.5、DTT(3mg/ml))、カルボキシメチル化し(ヨード酢酸)、トリプシンで切断した。ペプチド-糖ペプチド混合物を、RP-HPLCで分離し、エレクトロスプレー質量分析によってオンラインで分析した。ペプチドを含む糖構造m/zスペクトルを積分した。結果を表2に示す。
Man:それぞれ4個および5個のマンノース残基を持つ高マンノース構造。
G0、G1、G2:1個、2個または3個の末端ガラクトース残基を有するフコシル化二分岐複合体型炭化水素を有する還元された重鎖。
nonFuc:フコースを有さない二分岐複合体型炭化水素を有する還元された重鎖。
面積:ピーク面積
H27_G0〜H27_G4:x末端ガラクトースを有するフコシル化二分岐複合体型炭化水素(例えば4個のガラクトース単位を有するG4)を有する糖ペプチド H27(Asn298を含む)
Fucを含まない相対量:マンノース(4および5)糖構造(高マンノース)を含まないすべてのG0、G1、G2に関してのFucのパーセンテージ
H27_G1_1NGNA〜H27_G3_2NGNA:1〜2個のN-グリコリル-ノイラミン酸を持つx末端ガラクトース単位(例えば2単位を有するG2)を有するフコシル化二分岐複合体型炭化水素を有するAsn298を含む糖ペプチドH27
1)x末端ガラクトースを有するフコシル化二分岐複合体型糖構造(それぞれ0、1、2、3および4)
2)追加のn-グリコリルノイラミン酸残基を有するx末端ガラクトースを有するフコシル化二分岐複合体型糖構造(それぞれ0、1、2、3および4)
3)フコシル化二分岐複合体型糖構造(主に方法の人工産物)
4)それぞれ4個または5個のマンノース残基を持つ高マンノース構造
5)非フコシル化糖構造
抗IGF-IR HuMAbによる抗体媒介エフェクター機能の決定
作製されたHuMAb抗体の免疫エフェクター機序を誘発する能力を決定するために、抗体依存性細胞障害(ADCC)研究が行われた。
Claims (9)
- Asn297において糖鎖でグリコシル化されているヒトIgG1型またはIgG3型のモノクローナル抗体であって、
(a)該糖鎖内のフコース量が、液体クロマトグラフィー/質量分析(LCMS)ペプチドマップ解析によって分析される、マンノース4およびマンノース5を含まないG0、G1、G2の合計を100%とした場合に関して少なくとも99%であり、
(b)さらに該糖鎖内のNGNA量が、液体クロマトグラフィー/質量分析(LCMS)ペプチドマップ解析によって分析される、マンノース4およびマンノース5を含まないG0、G1、G2の合計を100%とした場合に関して1%またはそれ未満であり、かつ/または、該糖鎖内のN末端α1,3ガラクトース量が、液体クロマトグラフィー/質量分析(LCMS)ペプチドマップ解析によって分析される、マンノース4およびマンノース5を含まないG0、G1、G2を100%とした場合に関して1%またはそれ未満であることを特徴とする、登録番号DSM ACC 2795の寄託されたCHO細胞から産生されたモノクローナル抗体。 - NGNA量が0.5%またはそれ未満であることを特徴とする、請求項1記載の抗体。
- N末端α1,3ガラクトース量が0.5%またはそれ未満であることを特徴とする、請求項1または2記載の抗体。
- 抗体が、キメラ抗体、ヒト化抗体、またはヒト抗体であることを特徴とする、請求項1〜3のいずれか一項記載の抗体。
- 医用薬剤の製造のための、請求項1〜4のいずれか一項記載の抗体の使用。
- T細胞による疾患、自己免疫疾患、感染症、癌疾患の治療における使用のための免疫抑制用の請求項1〜4のいずれか一項記載の抗体。
- 請求項1〜4のいずれか一項記載の抗体を含む、薬学的組成物。
- 請求項1〜4のいずれか一項記載のモノクローナル抗体の組換え生成のための、CHO細胞株DSM ACC 2795の使用。
- CHO細胞株DSM ACC 2795における、請求項1〜4のいずれか一項記載のモノクローナル抗体の組換え生成のための方法。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012254996A (ja) * | 2006-04-11 | 2012-12-27 | F Hoffmann La Roche Ag | グリコシル化抗体 |
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