JP7048567B2 - 二重特異性抗原結合ポリペプチド - Google Patents
二重特異性抗原結合ポリペプチド Download PDFInfo
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Description
本出願は、2014年3月21日出願の米国仮特許出願第61/968,437号に基づく優先権を主張する。該出願の内容は、引用によりその全体が本明細書中に組み込まれる。
本発明は、高度に発現され、容易に精製され、高度に安定で、かつそれらの標的抗原に対して高い親和性を有する、二重特異性抗原結合ポリペプチドを提供する。ある態様において、二重特異性抗原結合ポリペプチドは、PDGFRβおよびHER2の両方に高い親和性を有して結合し、PDGFRβおよびHER2活性の両方を阻害する。ある態様において、二重特異性抗原結合ポリペプチドは、PDGFRβおよびVEGFの両方に高い親和性を有して結合し、PDGFRβおよびVEGF活性の両方を阻害する。本発明はまた、HER2に特異的に結合し、HER2活性を阻害する、新規の抗原結合ポリペプチド(例えば、VHドメイン)を提供する。かかる抗原結合ポリペプチドは、癌の処置に特に有用である。本発明はまた、抗原結合ポリペプチドをコードする核酸、組換え発現ベクターおよびかかる抗原結合ポリペプチドを産生する宿主細胞を提供する。疾患(例えば、癌)の処置のための本発明の抗原結合ポリペプチドの使用法もまた、本発明に包含される。
本発明がより容易に理解されるようにするために、特定の用語を最初に定義する。
本明細書で用いる用語“PDGFRβ”は、血小板由来増殖因子受容体βを意味する。PDGFRβヌクレオチドおよびポリペプチド配列は当技術分野でよく知られている。例示的なヒトPDGFRβアミノ酸配列は、GenBank deposit GI:4505683に記載されており、例示的なマウスPDGFRβアミノ配列は、GenBank deposit GI:226371752に記載されている。
一面において、本発明は、HER2に特異的に結合し、そしてHER2活性を阻害(inhibit)する、抗原結合ポリペプチド(例えば、二重特異性抗原結合ポリペプチド、抗体またはその抗原結合フラグメント)を提供する。かかる結合ポリペプチドは、HER2関連疾患または障害(例えば、乳がんおよび卵巣がんなどの癌)の処置に特に有用である。
別の面において、本発明は、第一および第二標的抗原に特異的に結合する二重特異性抗原結合ポリペプチドを提供する。任意の2つの抗原は、本発明の二重特異性抗原結合ポリペプチドを用いて標的化され得る。一般的に、本発明の二重特異性抗原結合ポリペプチドは、第一抗原に特異的に結合する第一VHドメインを含む抗体重鎖を含み、ここで、該重鎖は、第二抗原に特異的に結合する第二VHドメインに連結されている。
ある態様において、本発明の抗原結合ポリペプチドは、1つまたはそれ以上の修飾を含んでいてよい。本発明の抗原結合ポリペプチドの修飾形態は、当技術分野で公知の何らかの技術を用いて作製可能である。
ある態様において、本発明の抗原結合ポリペプチド(例えば、二重特異性抗原結合ポリペプチド、抗体またはその抗原結合フラグメント)は、当該技術分野で認識された技術を用いて、それらの免疫原性を低下させるために修飾されている。例えば、抗体またはそのフラグメントは、キメラ化、ヒト化、および/または脱免疫化されていてよい。
本発明の抗原結合ポリペプチドは、一般的に、抗体定常領域(例えば、IgG定常領域、例えば、ヒトIgG定常領域、例えば、ヒトIgG1、2、3または4定常領域)を含み、1つまたはそれ以上のエフェクター機能を仲介する。例えば、抗体定常領域への補体の1成分の結合は、補体系を活性化し得る。補体の活性化は、細胞病原体のオプソニン化および溶解に重要である。補体の活性化はまた、炎症反応を刺激し、自己免疫過敏症にも関与し得る。さらに、抗体は、細胞上のFc受容体(FcR)に結合する抗体Fc領域上のFc受容体結合部位で、Fc領域を介して種々の細胞上の受容体に結合する。IgG(ガンマ受容体)、IgE(イプシロン受容体)、IgA(アルファ受容体)およびIgM(ミュー受容体)を含む抗体の異なるクラスに特異的な多くのFc受容体がある。細胞表面上のFc受容体への抗体の結合は、抗体被覆粒子の取り込みおよび破壊、免疫複合体のクリアランス、キラー細胞による抗体被覆標的細胞の溶解(抗体依存性細胞介在性細胞傷害作用、またはADCCと呼ばれる)、炎症性メディエーターの放出、免疫グロブリンの胎盤通過および免疫グロブリン産生の制御を含む、多くの重要かつ多様な生物学的応答を引き起こす。好ましい態様において、本発明の抗原結合ポリペプチド(例えば、抗体またはその抗原結合フラグメント)は、Fc-ガンマ受容体に結合する。さらに別の態様において、本発明の抗原結合ポリペプチドは、1つまたは複数のエフェクター機能(例えば、ADCC活性)を欠く、および/またはFcγ受容体に結合できない、定常領域を含み得る。
本発明の抗原結合ポリペプチドは、例えば、共有結合が結合ポリペプチドをその同族エピトープへの特異的結合から妨げないように、該結合ポリペプチドへの分子の共有結合により、修飾されていてよい。例えば、限定はしないが、本発明の抗原結合ポリペプチドは、グリコシル化、アセチル化、ペグ化、リン酸化、アミド化、公知の保護基/遮断基による誘導体化、タンパク質分解切断、細胞リガンドまたは他のタンパク質への結合などにより修飾され得る。多数の化学修飾のいずれかは、特定の化学的切断、アセチル化、ホルミル化などを含むが、これに限定されない既知の技術によって行われ得る。さらに、誘導体は、1つまたはそれ以上の非古典的アミノ酸を含有していてよい。
上記のように、本発明の抗原結合ポリペプチドを提供するために、単離された遺伝物質の操作に続いて、遺伝子を、一般的に、所望の量の抗原結合ポリペプチドを生成するために使用することができる宿主細胞への導入のために発現ベクターに挿入する。
別の面において、本発明は、本明細書に記載の抗原結合ポリペプチドを含む医薬組成物を提供する。
本発明の抗原結合ポリペプチドは、HER2および/またはPDGFRβなどの細胞表面受容体の活性をアンタゴナイズするのに有用である。従って、別の面において、本発明は、本発明の1つまたはそれ以上の抗原結合ポリペプチドを含む医薬組成物をそれを必要とする対象に投与することにより、PDGFRβ-および/またはHER2-関連疾患または障害を処置するための方法を提供する。
本発明の好ましい態様を次に記載する:
[項1]
第二抗原に特異的に結合する第二VHドメインにC末端で連結されている、第一抗原に特異的に結合する第一VHドメインを含む抗体重鎖を含み、
抗体軽鎖を含まない、
単離された二重特異性抗原結合ポリペプチド。
[項2]
抗体重鎖が、アミノ酸リンカーを仲介して第二VHドメインに遺伝子的に連結されている、上記項1に記載の抗原結合ポリペプチド。
[項3]
リンカーが、配列番号23に記載のアミノ酸配列を含む、上記項2に記載の抗原結合ポリペプチド。
[項4]
抗体軽鎖をさらに含む、上記項1から3のいずれか一項に記載の抗原結合ポリペプチドであって、該軽鎖が、抗原に特異的に結合するVLドメインを含み、該重鎖および軽鎖は自然に対を形成している、ポリペプチド。
[項5]
VLドメインが第一抗原に結合する、上記項4に記載の抗原結合ポリペプチド。
[項6]
VLドメインが第三抗原に結合する、上記項4に記載の抗原結合ポリペプチド。
[項7]
上記項1から6のいずれか一項に記載の2つの抗原結合ポリペプチドの二量体を含む抗原結合ポリペプチドであって、該2つの抗原結合ポリペプチドが、重鎖定常領域を介して自然に二量体化している、抗原結合ポリペプチド。
[項8]
第一抗原と第二抗原とが異なる、上記項1から7のいずれか一項に記載の抗原結合ポリペプチド。
[項9]
第一抗原および第二抗原が同一分子の異なる領域内にある、上記項1から8のいずれか一項に記載の抗原結合ポリペプチド。
[項10]
第一抗原および第二抗原が異なる分子上にある、上記項1から9のいずれか一項に記載の抗原結合ポリペプチド。
[項11]
第一抗原および第三抗原が同一分子の異なる領域内にある、上記項1から10のいずれか一項に記載の抗原結合ポリペプチド。
[項12]
第一抗原および第三抗原が異なる分子上にある、上記項1から11のいずれか一項に記載の抗原結合ポリペプチド。
[項13]
第一抗原がヒトPDGFRβまたはHER2である、上記項1から12のいずれか一項に記載の抗原結合ポリペプチド。
[項14]
第二抗原がヒトPDGFRβまたはHER2である、上記項1から13のいずれか一項に記載の抗原結合ポリペプチド。
[項15]
ヒトHER2に特異的に結合するVHドメインを含み、かつ配列番号1、4、7および10からなる群より選択されるアミノ酸配列を含むHCDR3を含む、上記項1から14のいずれか一項に記載の抗原結合ポリペプチド。
[項16]
VHドメインが、配列番号2、5、8または11からなる群より選択されるアミノ酸配列を含むHCDR2をさらに含む、上記項15に記載の抗原結合ポリペプチド。
[項17]
VHドメインが、配列番号3、6、9または12からなる群より選択得されるアミノ酸配列を含むHCDR1をさらに含む、上記項16に記載の抗原結合ポリペプチド。
[項18]
配列番号13、14、15および16からなる群より選択されるVHドメインのアミノ酸配列と少なくとも80%のアミノ酸配列同一性を有するVHドメインのアミノ酸配列を含む、上記項15に記載の抗原結合ポリペプチド。
[項19]
VHドメインが、配列番号13、14、15および16からなる群より選択されるアミノ酸配列を含む、上記項15に記載の抗原結合ポリペプチド。
[項20]
ヒトPDGFRβに特異的に結合するVHドメインを含み、配列番号25に記載のアミノ酸配列を含むHCDR3を含む、上記項1から19のいずれか一項に記載の抗原結合ポリペプチド。
[項21]
VHドメインが、配列番号26に記載のアミノ酸配列を含むHCDR2をさらに含む、上記項20に記載の抗原結合ポリペプチド。
[項22]
VHドメインが、配列番号27に記載のアミノ酸配列を含むHCDR1をさらに含む、上記項20に記載の抗原結合ポリペプチド。
[項23]
配列番号24に記載のアミノ酸配列を含むVHドメインを含む、上記項20に記載の抗原結合ポリペプチド。
[項24]
配列番号18または20に記載のアミノ酸配列を含む重鎖を含む、上記項20に記載の抗原結合ポリペプチド。
[項25]
ヒトPDGFRβに特異的に結合するVLドメインを含み、配列番号29に記載のアミノ酸配列を含むLCDR3を含む、上記項1から24のいずれか一項に記載の抗原結合ポリペプチド。
[項26]
VLドメインが、配列番号30に記載のアミノ酸配列を含むLCDR2をさらに含む、上記項25に記載の抗原結合ポリペプチド。
[項27]
VLドメインが、配列番号31に記載のアミノ酸配列を含むLCDR1をさらに含む、上記項25に記載の抗原結合ポリペプチド。
[項28]
VL配列番号28に記載のアミノ酸配列を含むVLドメインを含む、上記項25に記載の抗原結合ポリペプチド。
[項29]
配列番号22に記載のアミノ酸配列を含む抗体軽鎖を含む、上記項25に記載の抗原結合ポリペプチド。
[項30]
配列番号1、4、7および10からなる群より選択されるアミノ酸配列を含むCDR3を含む、HER2に特異的に結合する単離された抗原結合ポリペプチド。
[項31]
配列番号1、4、7および10からなる群より選択されるアミノ酸配列を含むCDR3を含むVHドメインを含む、上記項30に記載の抗原結合ポリペプチド。
[項32]
VHドメインが、配列番号2、5、8または11からなる群より選択されるアミノ酸配列を含むCDR2をさらに含む、上記項31に記載の抗原結合ポリペプチド。
[項33]
VHドメインが、配列番号3、6、9または12からなる群より選択されるアミノ酸配列を含むCDR1をさらに含む、上記項31に記載の抗原結合ポリペプチド。
[項34]
配列番号13、14、15および16からなる群より選択されるVHドメインのアミノ酸配列と少なくとも80%のアミノ酸配列同一性を有するVHドメインのアミノ酸配列を含む、上記項31に記載の抗原結合ポリペプチド。
[項35]
VHドメインが、配列番号13、14、15および16からなる群より選択されるアミノ酸配列を含む、上記項31に記載の抗原結合ポリペプチド。
[項36]
配列番号13、14、15および16からなる群より選択されるアミノ酸配列を有するVHドメインと同じHER2上のエピトープに結合する、抗原結合ポリペプチド。
[項37]
配列番号13、14、15および16からなる群より選択されるアミノ酸配列を有するVHドメインとHER2に対する結合について競合する、抗原結合ポリペプチド。
[項38]
上記項1から37のいずれか一項に記載の抗原結合ポリペプチドをコードする単離された核酸。
[項39]
上記項38に記載の核酸を含む組換え発現ベクター。
[項40]
上記項39に記載の組換え発現ベクターを含む宿主細胞。
[項41]
抗原結合ポリペプチドが宿主細胞により産生されるような条件下で、上記項40に記載の宿主細胞を培養することを含む、抗原結合ポリペプチドの製造法。
[項42]
上記項1から37のいずれか一項に記載の抗原結合ポリペプチドおよび1つまたはそれ以上の薬学的に許容される担体を含む、医薬組成物。
[項43]
上記項42に記載の医薬組成物をそれを必要とする対象に投与することを含む、疾患または障害の処置法。
[項44]
該疾患または障害が癌である、上記項43に記載の方法。
本発明は、さらに限定するものとして解釈されるべきではない以下の実施例によりさらに説明される。配列表、図面ならびに本明細書中に引用した全ての文献、特許および公開された特許出願の内容は、引用により明示的に本明細書に包含される。
種々のHER2/PDGFRβ二重特異性抗原結合ポリペプチドフォーマットをコードする遺伝子を合成し、哺乳動物発現ベクター中にクローニングした。次いで、構築物を、標準的なプロトコルに従ってHEK293細胞中に一過性にトランスフェクトした。上清を回収し、発現について試験した。二重特異性フォーマット2(表4に記載の配列番号18)の発現された二量体のSDS-PAGEゲルを、図5に記載する。該ゲルは、非還元条件下で、期待値125Daのポリペプチドが発現されたこと(レーン2)、およびこれは、還元条件下で、期待値62.5kDaの単量体に解離されること(レーン1)を示す。
ELISAアッセイは、細胞上清中のHER2/PDGFRβ二重特異性抗原結合ポリペプチドの発現をアッセイするために開発された。すなわち、2ug/mLの抗ヒトFc抗体を、一晩、Maxisorp Immulonプレート上に捕捉し、そしてスーパーブロックでブロッキングした。上清を連続希釈し、プレート上にローディングした。培養培地を同様に希釈し、陰性対照として並行してローディングした。二重特異性抗原結合ポリペプチドを、抗ヒトFab特異的HRPを用いて検出した。図6に記載の結果は、ELISAアッセイが、HEK293細胞上清において二重特異性抗原結合ポリペプチドを検出可能であることを示す。
ELISAアッセイは、HER2/PDGFRβ二重特異性抗原結合ポリペプチドのHER2およびPDGFRβへの同時結合を検出するために開発された。すなわち、2ug/mLのヒトHer2-Fc融合タンパク質(Hisエピトープタグを含まない)を、一晩、Maxisorp Immulonプレート上に捕捉し、そしてスーパーブロックでブロッキングした。二重特異性抗原結合ポリペプチドを含むHEK293細胞上清を連続希釈し、プレート上にローディングした。1時間インキュベーション後、プレートを洗浄し、100nMのヒトPDGFRβ-Fc融合(Hisエピトープタグを含む)を該プレートに適用し、1時間インキュベートした。二重特異性AbのHer2およびPDGFRβへの結合を、抗HisHRPを用いて検出した。図7に記載の結果は、二重特異性抗原結合ポリペプチドが、HER2およびPDGFRβの両方に同時に結合できることを示す。
FACSベースの結合アッセイは、細胞の表面上に発現されたとき、HER2/PDGFRβ二重特異性抗原結合ポリペプチドのHER2およびPDGFRβへの同時結合を検出するために開発された。具体的には、HER2を構成的に過剰発現する200ulのHEK293細胞、またはPFGFRβを一過性に過剰発現するHEK293細胞、またはmockをトランスフェクトされた対照細胞を、新鮮な96ウェルプレートに1ml当たり100万個の細胞で播種した。細胞を4℃で維持して、受容体の内在化を回避した。フォーマット2またはフォーマット3のHER2/PDGFRβ二重特異性抗原結合ポリペプチド(表4ならびに図2および3を参照のこと)を含むHEK293細胞上清を、25nMの組換えヒトPDGFRβ-CF647または組換えヒトHer2-CF647と共にインキュベートし、二重特異性/標識されたタンパク質複合体を形成させた。インキュベーション後、100ulの各上清を、適当なHER2発現細胞、PDGFRβ発現細胞、または対照細胞に添加し、4℃で2時間振とうしながらインキュベートして、二重特異性/標識されたタンパク質複合体を細胞表面HER2およびPDGFRβへ結合させた。インキュベーション後、細胞を、1500rpmで4分間遠心してペレット化し、200ulの新鮮な完全培地で1回洗浄し、そして最終容量200ulの新鮮な完全培地中に再懸濁した。蛍光標識されたPDGFRβ-CF647またはHer2-CF647の該細胞への結合を、Guavaフローサイトメーター(Millipore)を用いて決定した。X軸方向の正のシフトは、標識されたPDGFRβ-CF647またはHer2-CF647の細胞との結合を示すと考えられた。
B8抗HER2 VHドメイン(配列番号13)のHER2への結合動態を、表面プラズモン共鳴アッセイ(Biacore)を用いて分析した。図9に示すように、B8 VHドメインは、1.2nMのKdを示し、1.39x105M-1s-1の会合速度(on-rate)および1.67x104s-1の解離速度(off-rate)を示した。
B12抗HER2 VHドメイン(配列番号14)、トラスツズマブ、またはペルツズマブの、単独または組み合わせでの、SK-BR-3細胞の増殖を阻害する能力を、MTS細胞増殖アッセイを用いて決定した。図11に示す結果は、B12 VH、トラスツズマブおよびペルツズマブの組合せが、各薬剤の単独使用またはトラスツズマブおよびペルツズマブのみの組合せで得られる結果よりも、細胞増殖のより大きな阻害をもたらしたことを示した。これらのデータは、B12 VHが、トラスツズマブおよびペルツズマブの細胞増殖阻害を増強するために使用可能であることを示している。
Claims (6)
- 抗原結合ポリペプチドの単離されたVHドメインであって、該単離されたVHドメインが配列番号13のアミノ酸配列を含み、該単離されたVHドメインがヒトHER2に特異的に結合する、抗原結合ポリペプチドの単離されたVHドメイン。
- 単離されたVHドメインが、表面プラズモン共鳴アッセイによる測定で1.2nM以下のKdでヒトHER2に結合する、請求項1に記載の抗原結合ポリペプチドの単離されたVHドメイン。
- 請求項1または2に記載の抗原結合ポリペプチドの単離されたVHドメインをコードする単離された核酸。
- 請求項3に記載の核酸を含むベクター。
- 請求項4に記載のベクターを含む細胞。
- 請求項1または2に記載の抗原結合ポリペプチドの単離されたVHドメインおよび薬学的に許容される担体を含む、医薬組成物。
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Patent Citations (2)
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US20090304590A1 (en) | 2007-05-29 | 2009-12-10 | Wyeth | Therapeutic compositions and methods |
WO2014012082A2 (en) | 2012-07-13 | 2014-01-16 | Zymeworks Inc. | Multivalent heteromultimer scaffold design an constructs |
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US10202462B2 (en) | 2019-02-12 |
JP2022062083A (ja) | 2022-04-19 |
WO2015143271A1 (en) | 2015-09-24 |
EP3712176A1 (en) | 2020-09-23 |
RU2016141285A (ru) | 2018-04-26 |
AU2021200347A1 (en) | 2021-03-18 |
KR20160135764A (ko) | 2016-11-28 |
AU2015231155A1 (en) | 2016-11-03 |
US11814441B2 (en) | 2023-11-14 |
JP6640181B2 (ja) | 2020-02-05 |
KR102399028B1 (ko) | 2022-05-17 |
AU2015231155B2 (en) | 2020-11-12 |
CA2943242A1 (en) | 2015-09-24 |
CN113150163A (zh) | 2021-07-23 |
RU2016141285A3 (ja) | 2019-05-15 |
US20150299335A1 (en) | 2015-10-22 |
RU2723940C2 (ru) | 2020-06-18 |
CN106164094A (zh) | 2016-11-23 |
EP3119812B1 (en) | 2020-04-29 |
EP3119812A1 (en) | 2017-01-25 |
ES2800674T3 (es) | 2021-01-04 |
EP3119812A4 (en) | 2017-10-25 |
US20190248918A1 (en) | 2019-08-15 |
CN106164094B (zh) | 2021-05-14 |
JP2017511152A (ja) | 2017-04-20 |
JP2020072686A (ja) | 2020-05-14 |
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