JP2006516184A - 免疫抑制特性を有するヒトcd3特異的抗体 - Google Patents
免疫抑制特性を有するヒトcd3特異的抗体 Download PDFInfo
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Abstract
Description
(a)免疫反応を抑制できる;
(b)定常抗体領域を欠いている;および
(c)T細胞レセプターのCD3複合体上のエピトープに結合する、
により特徴付けられる抗体に関する。
(a)ペプチドリンカーにより隔てられているか、またはリンカーなしのいずれかの少なくとも2つの免疫グロブリン可変VHおよびVLドメインをコードする遺伝子を単一の遺伝子構築物に組み合わせること、およびそれを細菌または他の適切な発現系において発現させることによる単鎖Fv-抗体の構築。
(b)ペプチドリンカーにより隔てられるか、またはリンカーなしのいずれかのヒトCD3に対して特異的な少なくとも2つのVHおよびVLを含有する単鎖Fv抗体の、それらの分子内対合を妨げる方向での非共有結合性二量体化または多量体化。
抗CD3 scFv10およびscFv6をコードする遺伝子を構築するため(図2)、抗ヒトCD3 scFv18の遺伝子を含有するプラスミドpHOG21-dmOKT3(Kipriyanovら, 1997, Protein Engineering 10, 445-453)を使用した。クローニング手順を容易にするため、NotI制限部位を、プライマーBi3sk, 5’-CAGCCGGCCATGGCGCAGGTGCAACTGCAGCAGおよびBi9sk, 5’-GAAGATGGATCCAGCGGCCGCAGTATCAGCCCGGTTを用い、scFv18遺伝子のPCR増幅によりプラスミドpHOG21-dmOKT3内に導入した。得られた776 bp PCR 断片を、NcoIおよびNotIで消化し、NcoI/NotI線状化ベクターpHOG21-CD19 (Kipriyanovら, 1996, J. Immunol. Methods 196, 51-62)内にクローン化し、このようにしてプラスミドpHOG21-dmOKT3+Notを作製した。Kabat番号付けスキーム(Kipriyanovら, 1997, Protein Engineering 10, 445-453)に従う100A位にCys-Ser置換を有するOKT VHドメインをコードする遺伝子を、プライマーDP1, 5’-TCACACAGAATTCTTAGATCTATTAAAGAGGAGAAATTAACCおよびDP2, 5’-AGCACACGATATCACCGCCAAGCTTGGGTGTTGTTTTGGCまたはOKT_5, 5’-TATTAAGATATCGGGTGTTGTTTTGGCTGAGGAGのいずれかを用いたPCRにより増幅し、それぞれ10個および6個のアミノ酸のリンカーが続くVHの遺伝子を作製した(図2)。得られた507 bpおよび494 bp PCR断片をNcoIおよびEcoRVで消化し、NcoI/EcoRV線状化プラスミドpHOG21-dmOKT3+Not内にクローン化し、このようにしてプラスミドpHOG21-scFv10/抗CD3およびpHOG21-scFv6/抗CD3をそれぞれ作製した。
大腸菌K12株RV308(Δlacχ74 galISII::OP308strA)(Maurerら, 1980, J. Mol. Biol. 139, 147-161)(ATCC 31608)を、scFv抗体の機能的発現に使用した。それぞれ発現プラスミドpSKK3-scFv6/抗-CD3およびpSKK3-scFv10/抗-CD3で形質転換した細菌を、100μg/mlアンピシリンおよび100 mMグルコースを含む2×YT培地(2×YTGA)中、26℃で一晩成長させた。一夜培養物を、新たな2×YTGA培地中で、600 nmにおける光学濃度(OD600)が0.1まで希釈し、フラスコ培養物として、激しく攪拌しながら(180〜220 rpm)26℃で、OD600が0.6〜0.8に達するまで成長を継続させた。細菌を5000 gで10分間、20℃での遠心分離により回収し、同容量の新たなYTBS培地(1Mソルビトール、2.5 mMグリシンベタインおよび50μg/mlアンピシリンを含有する2×YT)中に再懸濁した。イソプロピル-β-D-チオガラクトピラノシド(IPTG)を、最終濃度0.2 mMまで添加し、21℃で14〜16時間、成長を継続させた。細胞を9000 gで20分間、4℃での遠心分離により回収した。可溶性ペリプラズムタンパク質を単離するため、ペレット化した細菌を、初期容量の5%の氷冷200 mM Tris-HCl、20%スクロース、1 mM EDTA、pH 8.0中に再懸濁した。時々攪拌しながら氷上で1時間インキュベーションした後、スフェロプラストを、30000 gで30分間、4℃で遠心分離すると、可溶性ペリプラズム抽出物が上清みとして、スフェロプラストおよび不溶性ペリプラズム物質がペレットとして残った。ペリプラズム抽出物を、50 mM Tris-HCl、1M NaCl、pH 7.0に対して充分に透析し、scFv抗体を単離するための出発物質として使用した。組換え産物を硫酸アンモニウム沈殿により濃縮した(最終濃度70%飽和)。タンパク質沈殿物を、遠心分離(10000 g、4℃、40分)により回収し、初期容量の10%の50 mM Tris-HCl、1M NaCl、pH 7.0に溶解した後、同バッファーに対して充分透析した。Cu2+を充填し、50 mM Tris-HCl、1M NaCl、pH 7.0(開始バッファー)で平衡化したChelating Sepharose(Amersham Pharmacia, Freiburg, Germany)の5ml容カラムを用い、固定化金属アフィニティクロマトグラフィー(IMAC)を4℃にて行なった。試料を、重力流によってカラムを通過させることにより負荷した。次いで、カラムを、20カラム容量の開始バッファー、続いて50 mMイミダゾールを含有する開始バッファーで溶出液の吸光度(280 nm)が最小になるまで(約30カラム容量)洗浄した。吸着された物質を50 mM Tris-HCl、1M NaCl、300 mMイミダゾール、pH 7.0で1 ml画分として溶出した。組換えタンパク質を含有する溶出画分を、12% SDS-PAGEによる還元、続いてクーマシー染色により同定した。陽性画分をプールし、予め充填されたPD-10カラム(Pharmacia Biotech, Freiburg, Germany)を用いて、50 mM イミダゾール-HCl、50 mM NaCl (pH 7. 0)との溶媒交換に供した。タンパク質溶液の濁度を、遠心分離(30000 g、1時間、4℃)により除去した。
ヒトCD3+ T細胞白血病ジャーカット細胞株を、フローサイトメトリー実験に使用した。細胞を、5% CO2を含む加湿雰囲気中、37℃で、10%熱不活化ウシ胎児血清(FCS)、2 mM L-グルタミン、100 U/mL ペニシリンGナトリウム、100μg/ml硫酸ストレプトマイシン(すべて、Invitrogen, Groningen, The Netherlands製)を添加したRPMI 1640中で培養した。1 x 106細胞を、希釈したscFv抗体またはmAb OKT3(Orthoclone, OKT3, Cilag, Sulzbach, Gemany)を含む、2%熱不活化ウシ胎児血清(FCS, Invitrogen, Groningen, The Netherlands)および0.1%アジ化ナトリウム(Roth, Karlsruhe, Germany)を添加した0.1 mlリン酸緩衝生理食塩水(PBS, Invitrogen, Groningen, The Netherlands)(FACSバッファーという)とともに、45分間、氷上でインキュベートした。FACSバッファーで洗浄した後、細胞を、0.01 mg/ml抗(His)6 マウスmAb 13/45/31-2(Dianova, Hamburg, Germany)とともに同バッファー0.1 ml中で45分間、氷上でインキュベートした。第2洗浄サイクル後、細胞を、0.015 mg/ml FITC結合ヤギ抗マウスIgG(Dianova. Hamburg, Germany)0.1 mlとともに、先と同条件下でインキュベートした。次いで、細胞を再度洗浄し、2μg/mlヨウ化プロピジウム(Sigma-Aldrich, Taufkirchen, Germany)を含有するFACSバッファー 0.5 ml中に再懸濁し、死細胞を排除した。1 x 104染色細胞の蛍光を、Beckman-Coulter Epics XLフローサイトメーター(Beckman-Coulter, Krefeld, Germany)を用いて測定した。平均蛍光(F)を、System-IIおよびExpo32ソフトウェア(Beckman-Coulter, Krefeld, Germany)を用いて算出し、バックグラウンド蛍光を差し引いた。平衡化解離定数(Kd)を、ソフトウェアプログラムPRISM(GraphPad Software, San Diego, CA)を用いて実験値をラインウィーバー-バーク式:1/F = 1/Fmax + (Kd/Fmax)(1/[Ab])にフィッティングさせることにより決定した。
直接結合実験においてscFv6、scFv10およびOKT3間の差の生物学的関連性を調べるため、CD3+ジャーカット細胞の表面におけるscFv抗体のインビトロ保持を、フローサイトメトリーにより測定した(図7)。細胞表面保持アッセイは、保持されたscFv抗体の検出を、マウス抗(His)6 mAb 13/45/31-2(0.01 mg/ml, Dianova. Hamburg, Germany)、次いでFITC結合ヤギ抗マウスIgG(0.015 mg/ml, Dianova. Hamburg, Germany)を用いて行なった以外は、記載のようにして(Adamsら, 1998, Cancer Res. 58, 485-490)、細胞表面抗原のインターナリゼーションを抑制する条件下で37℃にて行なった。抗体の動力学解離定数 (Koff)および解離の半減期(t1/2)の値を、ソフトウェアプログラムPRISM(GraphPad Software, San Diego, CA)を用い、実験データの一相指数関数崩壊フィット(one-phase exponential decay fit)から推定した。一価scFv10は、比較的短い保持半減期(1.02分)を有したが、scFv6およびOKT3は、それぞれ、1.5倍および2.5倍長いt1/2を有し、したがって、直接結合実験から推定した高結合親和性と充分相関する(図7、表1)。
ヒトPBMCを、密度勾配遠心分離により、健常志願者のヘパリン処理末梢血から単離した。血液試料を、PBS(Invitrogen, Groningen, The Netherlands)で2回希釈し、Histopaque-1077(Sigma-Aldrich, Taufkirchen, Germany)のクッション上に重層し、800 gで25分間遠心分離した。界面上に位置するPBMCを回収し、使用前にPBSで3回洗浄した。
単離したPBMCを、10%熱不活化FCS、2 mM L-グルタミン、100 U/mL ペニシリンGナトリウム塩および0.1 mg/ml硫酸ストレプトマイシン(すべて、Invitrogen, Groningen, The Netherlands製)を添加したRPMI 1640中に再懸濁し、96ウェル平底組織培養皿(Greiner, Frickenhausen, Germany)に、ウェルあたり2 x 105の細胞密度で配置した。三連の培養物を、5% CO2を含む加湿雰囲気中、37℃で、表示された時間、続いて18時間、0.01 mM 5-ブロモ-2’-デオキシウリジン(BrdU)をパルス(pulsing)しながら、可溶性抗体の段階希釈物とともにインキュベートした。BrdUの取り込みを、製造業者の指示書にしたがって細胞増殖ELISA(Roche, Mannheim, Germany)により調べた。
活性化リンパ球によるサイトカイン分泌の測定のため、2 x 106 PBMCを、24ウェルプレート(Greiner, Frickenhausen, Germany)の個々のウェル内で、10%熱不活化FCS、2 mM L-グルタミン、100 U/mL ペニシリンGナトリウム塩および0.1 mg/ml硫酸ストレプトマイシン(すべて、Invitrogen, Groningen, The Netherlands製)を添加したRPMI 1640中で、表示した抗体とともに平板培養した。IL-2、TNF-αおよびIFN-γの分泌の測定のため、培養上清みのアリコートを、それぞれ24時間、36時間および72時間後に回収した。市販のELISAキットを用い、IL-2 (Pharmingen, San Diego, CA)TNF-αおよびIFN-γ(Endogen, Cambridge, MA)についてサイトカインレベルを二連で測定した。
初期活性化マーカーとしてIL-2レセプターのαサブユニット(CD25)の細胞表面発現の測定のため、2 x 106 PBMCを、24ウェルプレート(Greiner, Frickenhausen, Germany)の個々のウェル内で、10%熱不活化FCS、2 mM L-グルタミン、100 U/mL ペニシリンGナトリウム塩および0.1 mg/ml硫酸ストレプトマイシン(すべて、Invitrogen, Groningen, The Netherlands製)を添加したRPMI 1640中で、表示した抗体とともに平板培養した。90時間のインキュベーション後、細胞を回収し、フローサイトメトリー解析のため、実施例3に記載のようにして、PE結合抗CD25 mAb B1.49.9および対応するイソタイプ対照(すべてBeckman-Coulter, Krefeld, Germany社製)で染色した。104リンパ球を、Beckman-Coulter Epics XLフローサイトメーター(Beckman-Coulter, Krefeld, Germany)で解析した。平均蛍光(F)を、System-IIソフトウェア(Beckman-Coulter, Krefeld, Germany)を用いて算出し、バックグラウンド蛍光を差し引いた。
リンパ球上の細胞表面TCR/CD3の調節および被覆を測定するため、2 x 106 PBMCを、24ウェルプレート(Greiner, Frickenhausen, Germany)の個々のウェル内で、10%熱不活化FCS、2 mM L-グルタミン、100 U/mL ペニシリンGナトリウム塩および0.1 mg/ml硫酸ストレプトマイシン(すべて、Invitrogen, Groningen, The Netherlands製)を添加したRPMI 1640中で、表示した抗体とともに平板培養した。24時間のインキュベーション後、細胞を回収し、フローサイトメトリー解析のため、FITC結合抗OKT3(Dr. Moldenhauer, German Cancer Research Center, Heidelberg)またはPC-5結合抗TCRα/β(Beckman-Coulter, Krefeld, Germany)および対応するイソタイプ対照(Beckman-Coulter, Krefeld, Germany)で染色した。細胞を、Tリンパ球について抗CD5抗体(Beckman-Coulter, Krefeld, Germany)で対比染色し、Beckman-Coulter Epics XLフローサイトメーター(Beckman-Coulter, Krefeld, Germany)で解析した。CD5陽性細胞由来のOKT3-FITCおよびTCR-PC5の平均蛍光(F)を、System-IIソフトウェア(Beckman-Coulter, Krefeld, Germany)を用いて算出した。CD3調節の計算および被覆を以前に記載(Cole, M. S. ら, 1997, J. Immunol. 159, 3613-3621)のようにして行なった。
Claims (17)
- 以下の特性:
(a)免疫反応を抑制することができる;
(b)定常抗体領域を欠いている;および
(c)T細胞レセプターのCD3複合体上のエピトープに結合する、
により特徴付けられる抗体。 - 一価、二価または多価である請求項1記載の抗体。
- ダイアボディである請求項2記載の抗体。
- ペプチドリンカーにより連結された2つのscFv抗体を含有してなる請求項2記載の抗体。
- 単鎖ダイアボディである請求項2記載の抗体。
- 可変VHおよびVLドメインがペプチドリンカーSAKTTPまたはSAKTTPKLGGを介して連結されている請求項1〜5いずれか記載の抗体。
- 可変ドメインがATCC受託番号CRL8001のハイブリドーマにより産生される抗体の可変ドメインに相当する請求項1〜6いずれか記載の抗体。
- H100A位(Kabatナンバリングシステム)のシステインが別のアミノ酸に置換されている請求項7記載の抗体。
- システインがセリンに置換されている請求項8記載の抗体。
- 請求項1〜9いずれか記載の抗体をコードするポリヌクレオチド。
- 請求項10記載のポリヌクレオチドを含有してなる発現ベクター。
- pSKK3-scFv_6-抗-CD3(DSM 15137)である請求項11記載の発現ベクター。
- 請求項11または12記載の発現ベクターを含有してなる宿主細胞。
- 請求項1〜9いずれか記載の抗体、請求項10記載のポリヌクレオチドまたは請求項11もしくは12記載の発現ベクターを含有してなる医薬組成物。
- 免疫療法のための医薬組成物の調製のための請求項1〜9いずれか記載の抗体、請求項10記載のポリヌクレオチドまたは請求項11もしくは12記載の発現ベクターの使用。
- 前記免疫療法が急性移植片拒絶に対する治療である請求項16記載の使用。
- 遺伝子治療のための医薬組成物の調製のための請求項10記載のポリヌクレオチドまたは請求項11もしくは12記載の発現ベクターの使用。
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JP2015535828A (ja) * | 2012-09-21 | 2015-12-17 | リジェネロン・ファーマシューティカルズ・インコーポレイテッドRegeneron Pharmaceuticals, Inc. | 抗cd3抗体、cd3及びcd20に結合する二重特異性抗原結合分子、並びにそれらの使用 |
JP2019214591A (ja) * | 2012-09-21 | 2019-12-19 | リジェネロン・ファーマシューティカルズ・インコーポレイテッドRegeneron Pharmaceuticals, Inc. | 抗cd3抗体、cd3及びcd20に結合する二重特異性抗原結合分子、並びにそれらの使用 |
JP2021020961A (ja) * | 2012-09-21 | 2021-02-18 | リジェネロン・ファーマシューティカルズ・インコーポレイテッドRegeneron Pharmaceuticals, Inc. | 抗cd3抗体、cd3及びcd20に結合する二重特異性抗原結合分子、並びにそれらの使用 |
JP7490857B2 (ja) | 2012-09-21 | 2024-05-27 | リジェネロン・ファーマシューティカルズ・インコーポレイテッド | 抗cd3抗体、cd3及びcd20に結合する二重特異性抗原結合分子、並びにそれらの使用 |
Also Published As
Publication number | Publication date |
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JP5592045B2 (ja) | 2014-09-17 |
WO2004024771A1 (en) | 2004-03-25 |
AU2003270169A1 (en) | 2004-04-30 |
US20060233787A1 (en) | 2006-10-19 |
EP1400534A1 (en) | 2004-03-24 |
US9226962B2 (en) | 2016-01-05 |
CA2498523A1 (en) | 2004-03-25 |
EP1400534B1 (en) | 2015-10-28 |
ES2559763T3 (es) | 2016-02-15 |
CA2498523C (en) | 2014-04-01 |
US20130115213A1 (en) | 2013-05-09 |
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