JP7186940B2 - 血液-脳関門を移行する抗体変種及びその使用 - Google Patents
血液-脳関門を移行する抗体変種及びその使用 Download PDFInfo
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Description
GFKITHYTMG(配列番号:1)の相補性決定領域(CDR)1配列;
RITWGGX1X2TX3YSNSVKG(配列番号:2)のCDR2配列(ここでX1はD又はKであり、X2はN又はDであり、及びX3はF、I又はLである);並びに
GSTSTAX4PLRVDY(配列番号:3)のCDR3配列(ここで、X4はT又はKである):を含む、単離又は精製された抗体断片を提供する。
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTFYSNSVKG(配列番号:4)のCDR2配列、及びGSTSTAKPLRVDY(配列番号:9)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGKNTFYSNSVKG(配列番号:5)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDDTFYSNSVKG(配列番号:6)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTIYSNSVKG(配列番号:7)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;又は、
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTLYSNSVKG(配列番号:8)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列。
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTAKPLRVDYWGQGTLVTVSS(配列番号:11);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGKNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:12);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDDTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:13);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTIYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:14);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTLYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:15);及び
それらと実質的に同一の配列。
GFKITHYTMG(配列番号:1)の相補性決定領域(CDR)1配列;
RITWGGX1X2TX3YSNSVKG(配列番号:2)のCDR2配列(ここでX1はD又はKであり、X2はN又はDであり、及びX3はF、I又はLである);並びに
GSTSTAX4PLRVDY(配列番号:3)のCDR3配列(ここで、X4はT又はKである):を含む、単離又は精製された抗体断片を提供する。
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTFYSNSVKG(配列番号:4)のCDR2配列、及びGSTSTAKPLRVDY(配列番号:9)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGKNTFYSNSVKG(配列番号:5)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDDTFYSNSVKG(配列番号:6)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTIYSNSVKG(配列番号:7)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列;又は、
GFKITHYTMG(配列番号:1)のCDR1配列、RITWGGDNTLYSNSVKG(配列番号:8)のCDR2配列、及びGSTSTATPLRVDY(配列番号:10)のCDR3配列。
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTAKPLRVDYWGQGTLVTVSS(配列番号:11);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGKNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:12);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDDTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:13);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTIYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:14);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTLYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:15);及び
それらの実質的に同一の配列。
・光学的造影;
・ポジトロン放出断層撮影(PET)、ここで検出物質は、11C、13N、15O、18F、64Cu、62Cu、124I、76Br、82Rb及び68Gaなどの同位体であり、18Fが最も臨床で利用される;
・単光子放出型コンピュータ断層撮影(SPECT)、ここで検出物質は、具体的適用に応じて、99mTc、111In、123I、201Tl、133Xeなどの放射性トレーサーである;
・磁気共鳴画像法(MRI)、ここで検出物質は、例えば非限定的に、ガドリニウム、酸化鉄のナノ粒子及び炭素-コートされた鉄-コバルトナノ粒子であり、これにより、プラークの検出のためのMRIの感度を増強する;
・コントラスト-増強型超音波検査法(CEUS)又は超音波、ここで検出物質は、少なくとも1つの音響学的に活性のある気体-充填された微小気泡である。超音波は、ヒト疾患のスクリーニング及び早期発見のために広く採用される技術である。これは、MRI又はシンチグラフィーほど高価ではなく、且つこれは放射線とは関わりがないので、放射性核種造影などの分子造影モダリティよりもより安全である。
FC5の配列(配列番号:16)を基に、抗体のCDR内の単独の点変異を、性能を向上するように、設計した。FC5のCDRコンフォメーションのモデリングした3D-構造を使用し、sdAb変異体の構築の情報をもたらした。
実施例1において同定した単独の変異を、FC5-H7配列へ導入した。
実施例2において作製したプラスミドを、大腸菌細胞へクローニングし、発現させ、且つ小規模で精製し、各クローンの性能を評価した。
FC5変異体の選択戦略は、Mirrorball(登録商標)結合アッセイ(下記参照)を用い、少量で発現された全ての変種のスクリーニングを基にした。最初のスクリーニングラウンドは、ラットの脳内皮細胞SV-ARBECにおいて行った。次にSV-ARBECへの最良の結合親和性を持つクローンを、同じ結合アッセイを用い、SV-ARBEC及びヒト脳内皮細胞(HBEC)の両方における結合について再度試験した。
レーザー設定:488及び可能なら640、6.0mW
チャネル設定:FL-2(488-540nm)電圧600、感度4、Tiffファイルセーブド、並びにFL-4(650-690nm)電圧600、感度4、トリガー4、Tiffファイルセーブド
オブジェクト特徴:FL-2(ピーク強度、平均強度、総強度、及びベースライン)、並びにFL-4(ピーク強度、平均強度、総強度、及びベースライン)
集団定義:オブジェクト-セルフィルター(FL-4周辺長範囲0-500nm、並びにFL-2平均強度範囲0-15000)
集団統計:オブジェクト:オブジェクトの数、オブジェクト:平均(FL-2ピーク、平均、総強度及び周辺長)、並びにオブジェクト:平均FL-2ベースライン。オブジェクト:中央値(FL-2ピーク、平均、及び総強度)、オブジェクト:平均(FL-4ピーク、平均、総強度及び周辺長)、並びにオブジェクト:平均FL-4ベースライン。オブジェクト:中央値(FL-4ピーク、平均、及び総強度)セル:オブジェクトの数、セル:平均(FL-2ピーク、平均、及び総強度)、並びにセル:平均FL-2ベースライン。セル:中央値(FL-2ピーク、平均、及び総強度)セル:平均(FL-4ピーク、平均、及び総強度)、並びにセル:平均FL-4ベースライン。セル:中央値(FL-4ピーク、平均、及び総強度)。
SV-ARBEC細胞及びHBEC細胞の両方において改善された結合を明らかにしている実施例4において同定した48のクローンの最高の候補を、インビトロBBB透過性アッセイにおいて、Papp決定のために単独の時点を使用し、スクリーニングした。変種の定量は、MRM-ILISを用いて行った。
ヒトIgG1 Fc断片(配列番号:29)のN-末端へ融合した、FC5変種FC5、FC5-H7、D56K、N57D、F59I、F59L、及びT105K VHHを含む構築体(図7)を、調製し、発現し、且つ精製した。
Fc-融合したFC5 CDR変種(FC5、FC5-H7、D56K、N57D、F59I、F59L、及びT105K;実施例6)のラット(SV-ARBEC)、ヒト(HBEC-D3)及び非-ヒト霊長類(CynoBEC)の脳内皮細胞への結合を、実施例4に記載したように、Mirrorball(登録商標)高感度マイクロプレートサイトメトリー(TTP Labtech)を用いて評価した。
実施例6からのFc-融合したFC5-H7 CDR変異性変種(FC5、FC5-H7、D56K、N57D、F59I、F59L、及びT105K)は、血液-脳関門を移行するかどうかを評価するために、実施例5に記載したようなインビトロにおけるアッセイ及び定量法を、使用した。
FC5-H7変異性変種F59I及びT105KとのFc融合体は、脳へ、具体的には脳脊髄液(CSF)へ横断することができるかどうかを決定し、並びにCSF及び血清中のその存在を定量するために、インビボアッセイを行った。
アルブミン比=分析した血漿1nL当たりの強度/分析したCSFの1nL当たりの強度
1500及びそれ以下の比は、血液が夾雑したとみなした。
個別の実験において、FC5-H7-Fc、F59I-Fc、T105K-Fc、D56K-Fc、N57D-Fc、F59L-Fc及びA20.1-Fcを、各7mg/kgで、尾静脈を介した静脈内注射により投与し、24時間循環させた。その後ラットを、脳の特異的潅流を促進するために、ヘパリン添加(100U/ml)食塩水10mlで、左総頸動脈を介して、速度1ml/分で、十分に潅流した。その後脳を摘出し、50mMトリス-HCl pH8、150mM NaCl及びプロテアーゼインヒビターカクテル(Sigma-Aldrich、オークビル、ON)を含有する氷冷したホモジナイゼーション緩衝液中で、Dounceホモジナイザーを用いホモジナイズした(4℃で10-12ストローク)。次に試料を、各4℃で10秒間を3回音波処理し、不溶性物質を、除去した(10,000×gで10分間、4℃)。上清を、タンパク質含量について分析し、約0.5μgのタンパク質を、実施例5に説明した方法及び表1に示したペプチド署名を使用する、SRM分析に使用した。
Claims (18)
- 単離又は精製された抗体断片であって、
相補性決定領域(CDR)1配列: GFKITHYTMG(配列番号:1);
CDR2配列: RITWGGX1X2TX3YSNSVKG(配列番号:2)(ここで、X1はD又はKであり、X2はN又はDであり、及びX3はF、I又はLである);並びに、
CDR3配列: GSTSTAX4PLRVDY(配列番号:3)(ここで、X4はT又はKである)
を含み;
ここで、位置X1、X2、X3又はX4のアミノ酸残基の少なくとも1つは、配列番号:16のCDR2(配列番号:4)又はCDR3(配列番号:10)の対応する残基とは異なるものであって、
CDR1配列:GFKITHYTMG(配列番号:1)、CDR2配列:RITWGGDNTFYSNSVKG(配列番号:4)、及びCDR3配列:GSTSTAKPLRVDY(配列番号:9);
CDR1配列:GFKITHYTMG(配列番号:1)、CDR2配列:RITWGGKNTFYSNSVKG(配列番号:5)、及びCDR3配列:GSTSTATPLRVDY(配列番号:10);
CDR1配列:GFKITHYTMG(配列番号:1)、CDR2配列:RITWGGDDTFYSNSVKG(配列番号:6)、及びCDR3配列:GSTSTATPLRVDY(配列番号:10);
CDR1配列:GFKITHYTMG(配列番号:1)、CDR2配列:RITWGGDNTIYSNSVKG(配列番号:7)、及びCDR3配列:GSTSTATPLRVDY(配列番号:10);又は、
CDR1配列:GFKITHYTMG(配列番号:1)、CDR2配列:RITWGGDNTLYSNSVKG(配列番号:8)、及びCDR3配列:GSTSTATPLRVDY(配列番号:10)
を含み、哺乳動物の脳内皮細胞の表面に結合する、単離又は精製された抗体断片。 - CDR2が、RITWGGDNTFYSNSVKG(配列番号:4)、RITWGGKNTFYSNSVKG(配列番号:5)、RITWGGDDTFYSNSVKG(配列番号:6)、RITWGGDNTIYSNSVKG(配列番号:7)、及びRITWGGDNTLYSNSVKG(配列番号:8)からなる群から選択され;但しCDR2配列がRITWGGDNTFYSNSVKG(配列番号:4)である場合、CDR3は、GSTSTATPLRVDY(配列番号:10)ではないことを条件とする、請求項1に記載の単離又は精製された抗体断片。
- CDR3が、GSTSTAKPLRVDY(配列番号:9)又はGSTSTATPLRVDY(配列番号:10)であり;但しCDR3配列がGSTSTATPLRVDY(配列番号:10)である場合、CRD2は、RITWGGDNTFYSNSVKG(配列番号:4)ではないことを条件とする、請求項1に記載の単離又は精製された抗体断片。
- 以下からなる群から選択される配列を含む、請求項1~3のいずれか一項に記載の単離又は精製された抗体断片:
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTAKPLRVDYWGQGTLVTVSS(配列番号:11);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGKNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:12);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDDTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:13);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTIYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:14);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTLYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号:15);及び
それらと少なくとも90%同一の配列。 - 前記抗体断片が、単一ドメイン抗体(sdAb)である、請求項1~4のいずれか一項に記載の単離又は精製された抗体断片。
- 前記sdAbが、ヒト化されている、請求項5に記載の単離又は精製された抗体断片。
- 前記抗体断片が、多価ディスプレイフォーマットである、請求項1~6のいずれか一項に記載の単離又は精製された抗体断片。
- 前記抗体断片が、Fc断片に連結されている、請求項7に記載の単離又は精製された抗体断片。
- 前記Fc断片が、マウスFc2b又はヒトFc1である、請求項8に記載の単離又は精製された抗体断片。
- 前記Fc断片が、配列番号:29の配列を含む、請求項9に記載の単離又は精製された抗体断片。
- 前記単離又は精製された抗体断片が、血液-脳関門を移行する、請求項1~10のいずれか一項に記載の単離又は精製された抗体断片。
- 請求項1~11のいずれか一項に記載の単離又は精製された抗体断片をコードしている、核酸分子。
- 請求項12に記載の核酸分子を含む、ベクター。
- 前記単離又は精製された抗体断片が、表面上に固定されている、請求項1~11のいずれか一項に記載の単離又は精製された抗体断片。
- 前記単離又は精製された抗体断片が、カーゴ分子に連結されている、請求項1~11のいずれか一項に記載の単離又は精製された抗体断片。
- 前記カーゴ分子が、約1kDa~約200kDaの範囲の分子量を有する、請求項15に記載の単離又は精製された抗体断片。
- 前記カーゴ分子が、
検出物質、治療薬、薬物、ペプチド、成長因子、サイトカイン、受容体トラップ、化合物、糖鎖部分、酵素、抗体もしくはその断片、DNAベースの分子、ウイルスベクター、又は細胞傷害性物質;
検出物質、治療薬、薬物、ペプチド、酵素、抗体もしくはその断片、DNAベースの分子、ウイルスベクター又は細胞傷害性物質を負荷した1又は複数のリポソームもしくはナノ担体;あるいは、
1又は複数のナノ粒子、ナノワイヤ、ナノチューブ、もしくは量子ドット
である、請求項15又は16に記載の単離又は精製された抗体断片。 - 請求項1~11及び14~17のいずれか一項に記載の1又は2以上の単離又は精製された抗体断片、並びに医薬的に許容し得る担体、希釈剤、又は賦形剤を含有する組成物。
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WO2020092202A2 (en) * | 2018-10-29 | 2020-05-07 | Biogen Ma Inc. | Humanized and stabilized fc5 variants for enhancement of blood brain barrier transport |
KR20220134585A (ko) | 2020-01-31 | 2022-10-05 | 리제너론 파아마슈티컬스, 인크. | 액체 크로마토그래피-질량 분석법에 의한 고 신뢰성 화합물 식별 |
AU2023239442A1 (en) * | 2022-03-21 | 2024-10-10 | National Research Council Of Canada | Lipid based nanoparticles for targeted gene delivery to the brain |
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US10906973B2 (en) | 2021-02-02 |
WO2018109663A1 (en) | 2018-06-21 |
US20200095316A1 (en) | 2020-03-26 |
JP2020511941A (ja) | 2020-04-23 |
CA3046906A1 (en) | 2018-06-21 |
EP3551666A4 (en) | 2020-07-29 |
IL267190A (en) | 2019-08-29 |
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