JP5693447B2 - 細胞毒性免疫グロブリン - Google Patents
細胞毒性免疫グロブリン Download PDFInfo
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Description
"ドメインI"(アミノ酸残基、約1〜195)、"ドメインII"(アミノ酸残基、約196〜319)、"ドメインIII"(アミノ酸残基、約320〜488)及び"ドメインIV"(アミノ酸残基、約489〜630)(シグナルペプチド無しの残基の番号付け)。
本発明によれば、60kDまでの分子量を有し、Kd<10-8M、有利にはnMの範囲又はそれ以下の結合親和性で細胞表面ターゲットに特異的に結合する細胞毒性抗体が提供される。本発明による高親和性モジュラー抗体は、細胞層又は腫瘍を通りやすくし、またターゲットが過剰発現した箇所で細胞溶解又は細胞死を作用させる利点を持たせるためにサイズを小さくしてある。また本発明によるモジュラー抗体は、飽和結合アッセイで決定したように有利にはIC50<10-8Mを有する。
a、モジュラー抗体ドメインのオリゴマーのライブラリーを提供し、
b、エフェクターリガンドの存在で前記ライブラリーを前記ターゲットと接触させ、
c、次の
(i)Kd<10-8M又はIC50<10-8M及び
(ii)細胞毒性活性
両方の特性を有するライブラリーメンバーを選択し、かつ
d、モジュラー抗体の調製物を製造する
から成る。
定義
本明細書中で使用される特別な用語は以下の意味を有する。
− 上記のように本発明により製造されたモジュラー抗体ドメインのオリゴマーのライブラリーを用意し、
− スカフォールドリガンドの存在で、前記ライブラリーと前記ターゲットを接触させ、かつ
− 機能的オリゴマーの調製物を製造する
を有する。
例1:ノンフォーカストFcabライブラリー(Fcab01)の構築とファージ表面表示
IgG1 Fc断片の結晶構造(Bookhaven Databaseに1OQO.pdb入力と記載されている)を使用してFcabライブラリーの設計に役立てた。
配列番号4(PCRプライマーEPKSNCO)
ccatggccgagcccaaatcttgtgacaaaactc
配列番号5(PCRプライマーCH3LSAC)
agtcgagctcgtcacgggatgggggcaggg
配列番号6(PCRプライマーCH3CSAC)
gtacgagctcnnsnnsnnscaagtcagcctgacctgcctgg
配列番号7(PCRプライマーCH3CHIN)
tgccaagcttgctgtagaggaagaaggagccg
配列番号8(PCRプライマーCH3RHIN)
tgccaagcttaccgtgnnsnnsnnsaggtggnnsnnsgggaacgtcttctcatgctccg
配列番号9(PCRプライマーCH3RNOT)
agttgcggccgctttacccggagacagggagag。
例1に記載したように、ランダム化されたライブラリーの位置が完全にランダム化されたFcabライブラリーを調製した。すなわち、これらはNNS、NNB、NNK、NNNのコドンによりコード化されている。
配列:Recommendations 1984, A Cornish-Bowden, Nucleic Acids Res. 1985 May 10; (13)9: 3021-3030。
表示タンパク質の有効結合部位のアクセシビリティーを調べるために、結合アッセイを行った:ファージ懸濁液を抗−myc mAb 9E10被覆マイクロプレート(又はイムノチューブ)と反応させた。洗浄後、結合したファージが抗−M13−酵素共役物で検出された。コントロールとして、タンパク質融合とmyc-tagを表示しないヘルパーファージをプレートと反応させた。その他のコントロールは、ファージと被覆されていないプレートとの反応ならびにファージとファージのp3−融合相手を認識する抗血清との反応である。
表示すべきタンパク質と、遺伝子パッケージのアンカータンパク質の間のリンカー(線維状ファージの場合には、例えばp3、p8、pX、pIX、pVII)は、表示分子の有効結合部位が空間的にファージ粒子の付近にある場合には特に重要である。可変ドメイン及びCDR−ループにより形成された抗原結合部位及びp3に対するアミノ末端融合としてのライブラリーメンバーの表示を使用する抗体ライブラリーにおいて、潜在的な抗体結合部位はファージ粒子には向けられていない。従って、ライブラリーメンバーとファージコートタンパク質の間のリンカー構造は、あまり重要ではない。しかし、免疫グロブリン領域の底部ループの工学的作成及びファージ表示の実施は、非効率的な方法であってもよく、かつ抗原結合クローンの収率を下げるか又はこれを排除する。ライブラリーメンバーと、表面上のその融合相手の間のリンカーを変えることで、この問題を解決するかもしくは少なくとも低減させることができる。
1例として、ライブラリーFcab01(例1に記載)を使用できる。初めに、NcoIとNotI制限部位を用いて、このライブラリーをファージミド表示ベクターpHEN1中でクローニングした。このようにクローニングした場合に、18個のアミノ酸残基がFcab01ライブラリーインサートのC−末端アミノ酸残基と、ファージM13p3のN−末端アミノ酸残基の間にあった。この結合領域の配列は、配列番号10 SPGKAAAEQKLISEEDLNGAATVESに挙げられている。ここで、以下のように説明する:初めの4つの残基SPGKは、Fcab1ライブラリーインサートの4個のC末端残基であり、続いてアミノ酸配列AAAが続き、これはNotI制限部位によりコードされたアミノ酸残基であり、これにEQKLISEEDLが続く。これはmycエピトープであり、続いてNGAAがあり、この後にはアンバー終止コドンがある。これはE.coliのアンバーサプッレサー菌株中、例えばTG1中でグルタミン(Q)に翻訳される。配列番号10のC末端の4個の残基TVESは、ベクターpHEN1に存在するようなファージM13p3の4個のN末端残基である。
ファージ懸濁液をαvβ3−インテグリン被覆マイクロプレート(又はイムノチューブ)と反応させた。洗浄後、結合したファージが抗M13−酵素共役物で検出された。コントロールとして、タンパク質融合を表示しないヘルパーファージ及びmyc-tagを、プレートならびにそれらの表面上でwtFcabを有するファージ粒子と反応させた。その他のコントロールは、ファージと被覆されていないプレートとの反応、及びファージとファージのFcab−融合相手を認識する抗血清との反応である。長さが増したリンカーを有するファージ粒子は、pHENFcabRGD4に含有されているような元のリンカーを有するファージ粒子よりも容易にαvβ3−インテグリンと反応し、それゆえELISAにおいて強いシグナルを生じた。
Fcabライブラリーの設計(図2に記載):抗体のCH3定常ドメインの非CDRループのアミノ酸の位置をランダム化に考慮した。特にループA-B、C-D及びE-Fは、これらがドメインの片側にあると考えられている。特定の位置でランダム化するための設計基準の幾つかをここで説明することにする。
特定のループ構造は、全体の天然構造を保持するためにスカフォールドタンパク質により必要とされる。ループ及び延長したループ内での多くのアミノ酸位置のランダム化は、ランダム化位置の片側又は両側で特定の配列を形成することで促進させることもできる。これらの配列は柔軟な配列であってよく、それによりこのような位置での特定のライブラリー配列の伸長が補償できる。
バクテリア中でのFcab設計とライブラリーの作成に関する上記の例と同様に、酵母ライブラリーを作成した。表3に示されているように、変性ABループ、CDループ及びEFループの様々な組合せを作成した。この例で変性したABループは、アミノ酸358〜368(wt配列"LTKNQ")に及び、CDループはアミノ酸384〜388(wt配列"NGQPE")に及び、かつEFループは413〜419(wt配列"DKSRWQQ")に及ぶ。
pYD1(Invitrogen社)をベースベクターとして使用した。XhoI部位を除去するためにベクターを以下のように変性した:pYD1をXhoIで切断し、DNAポリメラーゼのクレノウ断面で処理し、かつライゲーションした。得られた配列は、pYD1dX(配列番号15/図8)に挙げられている。pYD1dXは位置921/925で特有のBamHI制限部位と、963/967でNolI制限部位を含む。pYD1dXは、これらの2つの制限酵素で開環される。ヒトIgG1からのCH1-ヒンジ-CH2-CH3をコードするインサートは、ヒトIgG1モノクロナール抗体のH鎖をコードするcDNAからPCRにより調製される。このインサートでは、位置突然変異誘発が標準的な方法を用いて導入され、CH1ドメインのC末端システイン残基をセリンに突然変異させる。インサートは、両末端にそれぞれBamHI及び非制限部位と結合するPCRプライマーを用いて増幅される。次にこれらの制限部位を、pYD1dXにインサートをクローニングし、表示ベクターpYD1dXFc(配列番号16/図9)を生成するために使用した。
突然変異がCH3ドメインの構造ループに導入されたライブラリーのクローニングは、相同組換えにより酵母で行った(ギャップ修復)。このために、CH3ドメインを欠く宿主ベクターを調製した:pYD1DxFcをXhoI(位置1603/1607)とNotI(位置1921/1925)で切断し、大きな断片を分取ゲル電気泳動により調製し、DNAポリメラーゼのクレノウ断片で処理し、かつ再びライゲーションした。この手法は、特有のXhoI部位(位置1603/1607)を再構築し、かつベクターpYD1CH12(配列番号17/図10)を生じた。引き続き、pYD1CH12をXhoIで切断し、かつ酵母中でのギャップ修復のためのレシピエントベクターとして使用した。
回収した酵母ライブラリー(yFcabライブラリー)をSD-CAA培地(10g/l酵母窒素ベース、10g/lカザミノ酸、及び20g/lデキストロース、0.1g/lロイシン、9.67g/l NaH2PO4-2H2O及び10.19g/l Na2PO4・7H2O)10ml中で接種し、かつ振盪機において250rpm及び28℃で6〜8時間成長させた。培養物のOD600を測定決定し、かつ培養物を0.2のOD600までの希釈し、かつ同じ条件で1〜2のOD600が達成されるまで成長させた。遠心分離(3000rpm/5分/4℃)により細胞を回収し、かつ誘導培地SG/R-CAA(10g/l酵母窒素ベース、10g/lカザミノ酸、及び20g/lデキストロース、10g/lラフィノース、0.1g/lロイシン、9.67g/l NaH2PO4-2H2O及び10.19g/l Na2PO4・7H2O)中に再懸濁させた。培養物を振盪機において250rpmかつ20℃で2日間インキュベーションにより誘発し、引き続き分析かつ分類した。二者択一的に、培養物を振盪機において250rpmかつ37℃で1日間インキュベーションし、引き続き分析かつ分類した。
SD-CAA培地で誘発した2日後に、yFcabライブラリーをそれらの発現レベル及び発現したFcabの品質に関して試験した。ポリクロナール抗ヒトIgG-Fc抗血清(Sigma社)を用いて発現レベルを試験した。このために、0.5×10e6ライブラリー細胞を1ml染色バッファー(SB)中で希釈した。これは、2%BSAを有するPBCから成っていた。細胞をペレット化し、かつ1/2000希釈された抗ヒトIgG-Fc抗血清(Sigma社)を含有する100μlSBで30分間氷上で染色し、SBで2回洗浄し、かつ引き続きFACS中で分析した。一般的に、全ての細胞の70%〜80%が各ライブラリー中、その細胞表面上でFcabを発現した。Fcabの正確なフォールディングを試験するために、タンパク質Aの染色を行った。再び0.5×10e6ライブラリー細胞を1ml染色バッファーSB中で希釈し、細胞をペレット化し、かつ1μg/mlProt-A-FITC(Fluka社)含有の100μlSBで氷上で30分間染色し、SBで2回洗浄し、かつ引き続きFACS中で分析した。一般的に、上記のようにyFcabライブラリーは40%以上のタンパク質A陽性細胞を示した。
組換え抗原、例えばHer2(Bendermedsystems)を製造者の指示に従って、Pierce社のEZリンク系を用いて行った。簡単に述べると、抗原をPBSで透析し、PBS中で1mg/mlに希釈し、かつ水中で予備透析しておいた10mMスルホ-LC-LC-ビオチン(EZリンク、Pierce社)と混合した。抗原とビオチンの最終比は1:3であり、かつ混合物を室温で30分間インキュベートした。この後に、MWCO3000(Sartorius社)カラムを用いて混合物をPBSに対して"透析"した(5×8’、4000rpm)。最後に、ビオチン化した抗原(Her2)の濃度をHPLCにより試験し、かつ−20℃で貯蔵した。
FACSを用いた抗原特異的(Her2)Fcabの選択
第一の選択段階:
FACS分類の2日前に、2.5×10e8個の独立したFcabクローン含有の酵母ライブラリーをSG/R-CAA培地で誘発し、上記のようにそれらの細胞表面上にFcabを発現させた。ライブラリーの例えば10倍(=2.5×10e9)をカバーする細胞の量を、2mlSB中500nMビオチン化抗体(Her2)と一緒に30分間インキュベートした。次に細胞を冷SBで1回洗浄し、次にSB中1:100希釈しておいたストレプタビジン−PE(R&D systems社製)と一緒に氷上で30分間インキュベートした。細胞を冷SBで2回洗浄し、かつ1×10e9細胞/mlの最終濃度まで希釈した。100μl中の5×10e6細胞/mlでのコントロール染色は、抗原の不在下にストレプタビジン−PEだけで行った。完全なライブラリーとコントロール染色の両方は、例えばBD由来のFACS ARIAにおいて分析した。分類様のゲートを用意するために、コントロール細胞を使用した。はじめに、FSC/SSCゲート(G1)をセットし、正常な酵母細胞を同定し、G1からはFSC-幅対FSC-面積プロットを作成し、かつ凝集していない細胞を新たなゲート(G2)で選択した。引き続きFSC対FL-2(PEチャネル)を用いて、ストレプタビジン−PEとの反応性に関してG2中の細胞を分析した。(擬)陽性細胞0.1%を含むようにG3を用意した。引き続き、上記のようなセットと用いて少なくとも5×10e8染色細胞(ライブラリーサイズ2倍、又は理想的にはそれ以上)を分析し、かつG3の細胞をSD-CAA培地2〜3ml含有のチューブ内に貯蔵した。おおよそ5×10e5細胞(プール1)が選択の第一段階で回収され、かつ1〜2日間増殖させ、この後に細胞を−80℃で貯蔵することができ、かつアリコートを誘発し、上記のようにFcabを発現させることができた。2日以上後に、次の選択段階を行ってもよい。
第一段階で選択したプール1を誘発し、上記のようにそれらの表面上でFcabを発現させた。少なくとも5×10e6細胞(プール1の複数のコピーを含む)を1ml SB中、500nMビオチン化抗原(Her2)と一緒に氷上で30分間インキュベートした。次に細胞を冷SBで1回洗浄し、次にSB中1:100希釈したストレプタビジン−PE(R&Dsystems社製)を用いて2μg/mlタンパク質A−PE(Fluka社)と一緒に氷上で30分間インキュベートした。次に細胞を冷SBで2回洗浄し、かつ約2×10e6細胞/mlの最終濃度まで希釈した。更に、コントロール染料を行い、その際に、100μl細胞中のプール1の5×10e6細胞/mlを上記のようにProAとストレプタビジン−PEの混合物と一緒にインキュベートしたが、しかし抗原(Her2)とはインキュベートしなかった。更に、Fcab-wtを発現する酵母クローン100μl中5×10e5細胞(非ランダム化Fc断片)を上記のようにストレプタビジン−PEの不在下にProA−FITCで染色した。Fcab-wt発現細胞を例えばBD由来のFACS ARIAにおいて分析し、分類のためのゲートを調整した。はじめにFSC/SSCゲート(G1)を調整して正常な酵母細胞を同定し、G1からFSC幅対FSC面積−プロットを作成し、かつ凝集しない細胞だけを新たなゲート(G2)中で選択した。
アフィニティー突然変異のために、選択クローンにおいて又は選択クローンのプールにおいて、有利には1つだけのループ(この場合にはABループ)に多様性を導入した。このために、位置359と360及び361(EU番号付け)に変性コドンを含むプライマー:
(プライマーAbmut gaaccacaggtgtacaccctgcccccatcccgggatgagctgnnbnnbnnbcaggtcagcctgacctgcctggtcaaag、配列番号26)又は
二者択一的に、位置358、359、360、361及び362(EU番号付け)に変性コドンを含むプライマー(プライマーAbmut2LR、gaaccacaggtgtacaccctgcccccatcccgggatgagnnbnnbnnbnnbgtcagcctgacctgcctggtcaaag、配列番号27)を用いてPCRを行った。
Abmut1L
(gaaccacaggtgtacaccctgcccccatcccgggtgagnnbnnbnnbnnbcaggtcagcctgacctgcctggtca
aag、配列番号28)又は
Abmut1R
(gaaccacaggtgtacaccctgcccccatcccgggatgagctgnnbnnbnnbnnbgtcagcctgacctgcctggtca
aag、配列番号29)
を使用してもよい。同様の方法で、EFループ中の残基を全ランダム化によりランダム化した。
親和性成熟したプール2.3と2.4及び必要な場合にはプール2.1(タンパク質A陽性細胞だけが好ましい)を誘発し、上記のようにそれらの細胞表面上でFcabを発現させ、かつ引き続き"第二の選択段階"で記載したように分類したが、但しプール2.3と2.4がはるかに大きい点が異なった。よってプールの染色体積は、"第一の選択段階 "で記載したライブラリー染色のものと等しかった。第三の選択段階では、Her2陽性/タンパク質A細胞だけを分類した。これらの選択から誘導されたプールは通常>20%のHer2/タンパク質A陽性細胞を含有した。そうでない場合には、Her2の第四及び第五(又はそれ以上)の選択の段階をタンパク質Aと一緒に又は用いずに行った。例えば、H242-9Qクローンの親和性熟成は、EC50=155nMから18.9nM(H10-03-6クローン)に対する結合親和性の増大を生じた。
Her2/タンパク質A細胞(>20%が好ましい)含有のプールからの独立したクローンを、このプールをSD-CAA培地含有のアガールプレートにプレーティングするか、又はプールを生じさせずにプレート上にFACS ARIAから直接に単一細胞(=クローン)をスポットすることにより調製した。クローンを成長させ、かつ液体培地に移し、かつ−80℃で貯蔵した。引き続きクローンのアリコートを誘発し、上記のようにそれらの細胞表面上にFcabを発現させ、かつFACSにおいて幾つかのパラメーターをスクリーニングした。これらのパラメーターは以下のものである:タンパク質A−FITCの存在あり及び不在で、選択(Her2)に使用した抗原の用量応答範囲、上記のようなCD64染色。更に、類似した染色プロトコールを用いて、幾つかの関係の無いビオチン化抗原をスクリーニングし、非交叉反応するFcabを同定した。
上記のような特徴を有し、上記のように選択されたクローンを、pCEP4(Invitrogen社)のような哺乳類発現ベクター中でクローニングした。高度に精製されたプラスミドDNA(Qiagen社)を、製造者(Invitrogen社)により推奨されているようなFreestyleTM MAX ReafentでHEK293freestyle細胞を一時的にトランスフェクトするために使用した。トランスフェクション5日後に、遠心分離により、かつ0.2μMのステリカップフィルター(Millipore社)を通して濾過することにより細胞上澄液を細胞崩壊物からクリアーにした。二者択一的に、HEK293freestyle細胞又はCHO細胞を、ネオマイシン又はピューロマイシンのような抗体耐性用の遺伝子を含有する発現プラスミドでトンランスフェクトした。トランスフェクトした細胞を抗体の存在で培養し、特異的に生存する細胞クローンを生じた。これは抗原特異的Fc断片と一緒に抗体耐性遺伝子を安定に発現する。このような安定なトランスフェクタントは、長期間にわたり一定して関心のあるタンパク質を分泌する。タンパク質Aイムノアフィニティークロマトグラフィーにより抗原特異的Fcabを細胞上澄液から精製した。カラムをグリシン緩衝液(pH=2.9〜4.0)で洗浄することにより、結合したFcabをタンパク質Aから溶出し、続いてPBS(pH=6.8)に対して透析した。Fcabの純度は、非還元SDS-PAGE分析により測定し、かつZorbax GF250カラム及びPBSをランニング緩衝液として用いて、可能性のある凝集物をサイズ排除HPLCにより検出した。
Fcレセプターとタンパク質Aへの結合を使用して精製したFcabの全体の構造的統一性を予測した。ネオナタルFcレセプター(FcRn)との会合は、組換えヒトFcRnの5000応答ユニット(RU)に連結したBiocore CM5チップに10μg/mlFcabをpH=6.0で添加して測定した。FcRnからのFcabの解離は、pH=7.4で試験した。これらの実験は、Her-2特異的Fcabと、野生型Fcabに極めて類似した結合特性を有するFcRnとのpH依存的相互作用を証明した。高親和性FcレセプターCD64へのFcabの結合は、3000RUタンパク質Aで被覆したBiacore CM5チップを用いて測定し、続いて10μg/mlFcab溶液を添加した。最後に、ヒト可溶性CD64を5μg/mlで加えた。得られた結合曲線は、野生型Fcabで得られたものと見分けがつかなかった。組換えFcab(10μg/ml)とタンパク質Aの相互作用は、タンパク質Aを被覆したBiacore CM5チップ(3000RU)を用いてSPRによっても測定した。再び、親和性は野生型Fcabで得られたものと匹敵可能であった。
Her2に結合するHer2-特異的Fcabのポテンシーと特異性は、ELISAにより推定した。ヒト可溶性Her-2(Bender Med Systems社、オーストリア)を2μg/mlでプラスチックに被覆した。非特異的結合部位を洗浄かつブロックした後に、Fcabの濃度を増大させながら添加した。Her-2が結合したFcabを検出するために、ホースラディッシュ・ペルオキシダーゼ(Serotec社)に共役した抗−FcCH2ドメインに特異的なモノクロナール抗体を添加した。結果は、幾つかのHer-2特異的Fcabがそのターゲットと低いnM範囲で相互作用できることを証明した。それというのも、他のHerファミリーメンバー(Her1、Her3及びHer4)に対する結合がELISAにより判定されたものよりも100倍以上弱かったからである。Her-2に無関係の抗原に対する結合は何も検出されなかった。
抗原特異的Fcabのエフェクター機能(ADCC):
Her-2特異的FcabがFcエフェクター機能を媒介するかどうかを決定するために、ADCCアッセイを行った。これらのタイプのアッセイでは、抗体はターゲット細胞に結合し、かつこれらをナチュラルキラー(NK)細胞のようなエフェクター細胞上のFcレセプターに対する結合によるアポトーシスについてマークした。蛍光染料カルボキシ−フルオルセイン・スクシンイミジルエステル(CFSE)で標識されたSKBR3(ターゲット細胞)を、Her-2特異的Fcabの濃度を増大させながら37℃で20分間インキュベートした。製造者(Miltenyi Biotech)の指示に従い、MACS磁気ビーズを使用してAutoMACS装置内で、ネイティブディプレションにより付着していないNK細胞を健常ドナーのヒト血液から単離した。精製したNK細胞をオプソニン処理したSKBR3細胞と5:1の比で混合し、かつ37℃で4時間インキュベートした。この後に、アポトーシス細胞を特異的に染色する蛍光染料7−アミノアクチノマイシン(7-AAD)を加えた。アポトーシスSKBR細胞は、FACSでは7-AAD/CSFE二重陽性細胞として数えられた。Her-2特異的FcabであるH10-03-6とABEFs0101は、それぞれ1.1nMと1.0nMのEC50値で死滅させるSKBR3細胞の可能性のあるメディエーターであることが分かった。アポトーシス誘発のメカニズムは、NK細胞の存在に依存し、Her-2特異的FcabがADCC機能を有することを証明する。
酵母でFab断片を表示するたmに、酵母表示ベクターpYD1(Invitrogen社)(配列番号72/図17)を以下のように変性した:
NheI制限部位を部位特異的突然変異により位置581/586で導入し、変性ベクターpYD1Nhe(配列番号72/図18)を生じた。このベクターをNheIとPmeIで制限し、3つの断片を生じた。最大の断片はベクターの骨格の残りであった。その中に合成オリゴヌクレオチドリンカーを挿入し、ベクターpYD1lnk(配列番号74/図19)を生じた。次にベクター0pYD1からMATα転写末端領域を含むカセットをPCRにより増幅し、かつBamHIとPstI制限によりpYD1lnk中にクローニングし、かつライゲーションした。得られたベクターはpYD1mata(配列番号75/図20)であった。GAL1プロモーター、Aga2をコードする遺伝子及びNotIとSfiIクローニング部位を有する合成リンカーを含むカセットをpYD1からPCRにより増幅し、かつEcoRIとPacI制限部位によりpYD1mata中にクローニングし、ベクターpYD1gal(配列番号76/図21)を得た。
酵母中での表示ライブラリー構築における第一の工程として、野生型CL(Cκ)ドメインを制限酵素BsiWIとAscIを用いて表示ベクターpYD4D5hl(配列番号81)から切り取った。BsiWIとAscI部位によりフランキングされたヒトCκドメインをコードする合成遺伝子(pYD4D5hlによる状況)を調製し、その際に、ランダム突然変異と挿入を、それぞれABとEFループ内に導入した。この特別な例では、3、4又は5個のNNBコドンの挿入をヒトCκドメインのアミノ酸位置16と17の間で行い、かつ残基の位置92、93、94、95、97、98及び99をNNBコドンと置き換えた(IMGT番号付け、図2参照)。NNBコドンは、位置1と2で全部で4個のヌクレオチドを含有し、かつ位置3でC、G及びTを含有した。従って、NNBは天然にコードされるアミノ酸を全部で20個コードする。
Claims (13)
- 60kDまでの分子量を有し、Kd<10-8Mの結合親和性で細胞表面ターゲットに特異的に結合する、細胞毒性モジュラー抗体であって、細胞表面ターゲットがHer2であり、かつ抗体が、CH3ドメインの構造ループ領域内でHer2に特異的に結合し、配列表番号191、241及び370のアミノ酸配列を含む結合部位を含む、前記細胞毒性モジュラー抗体。
- ADCC、ADCP、CDC又はアポトーシス活性のうち少なくとも1つを有する、請求項1に記載のモジュラー抗体。
- アポトーシス活性を有する、請求項2に記載のモジュラー抗体。
- 前記抗体は、モジュラー抗体ドメインのオリゴマーである、請求項1から3までのいずれか1項に記載のモジュラー抗体。
- 前記抗体が、抗原結合Fcである、請求項1から4までのいずれか1項に記載のモジュラー抗体。
- 前記抗体がIgG1 Fcである、請求項1から5までのいずれか1項に記載のモジュラー抗体。
- さらに、1つ以上の変性モジュラー抗体と又は非変性モジュラー抗体もしくはこれらの一部と組合せた、請求項1から6までのいずれか1項に記載のモジュラー抗体を含む組合せモジュラー抗体。
- 完全な抗体分子である、請求項7に記載の組合せモジュラー抗体。
- 前記抗体がヒト免疫グロブリンである、請求項1から6までのいずれか1項に記載のモジュラー抗体。
- 前記抗体が、ヒトIgA1、IgA2、IgD、IgE、IgG1、IgG2、IgG3、IgG4又はIgMである、請求項9に記載のモジュラー抗体。
- 前記モジュラー抗体が、モジュラー抗体のドメイン又はミニドメインが1つ以上の他のタンパク質に融合されている融合タンパク質である、請求項1から10までのいずれか1項に記載のモジュラー抗体。
- 前記モジュラー抗体に融合したタンパク質が、他のモジュラー抗体、免疫グロブリン、リガンド、スカフォールドタンパク質、酵素、及びトキシンからなる群から選択される、請求項11に記載のモジュラー抗体。
- erbBクラスのレセプターを発現し、レセプターがHer2である充実性腫瘍を患っている患者を治療するための、請求項1から12までのいずれか1項に記載のモジュラー抗体を含む医薬組成物。
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JP2015028078A (ja) * | 2008-05-02 | 2015-02-12 | エフ−スター ビオテヒノロギッシェ フォルシュングス− ウント エントヴィッケルングスゲゼルシャフト ミット ベシュレンクテル ハフツングf−star Biotechnologische Forschungs− und Entwicklungsges.m.b.H. | 細胞毒性免疫グロブリン |
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