JP2021508479A - ヘテロ二量体特異的抗体上のcd3デルタ及びcd3イプシロン - Google Patents
ヘテロ二量体特異的抗体上のcd3デルタ及びcd3イプシロン Download PDFInfo
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Abstract
【選択図】図2
Description
本出願は、2017年12月27日に出願された米国仮特許出願第62/610,764号の優先権の権益を主張し、この開示は、その全体が本明細書に参考として援用される。
身体の免疫システムは、感染、傷害及びがんに対する防御の役割を果たす。2つの別々ではあるが、相互に関連したシステムである、体液性免疫システムと細胞性免疫システムは、身体を保護するために一緒に働く。体液性システムは、抗体と呼ばれる可溶性因子によって媒介され、体内で異物として認識される生成物を中和する。対照的に、細胞性システムは、外来の侵入物を除去し中和するT細胞及びマクロファージなどの細胞を含む。
CD3抗体は、例えば、米国特許第5,585,097号、5,929,212号、5,968,509号、6,706,265号、6,750,325号、7,381,803号、7,728,114号に開示されている。CD3結合特異性を有する二重特異性抗体は、例えば、米国特許第7,262,276号、7,635,472号、7,862,813号、及び8,236,308号に開示され、それぞれは本明細書に参照により具体的に組み込まれる。CD3結合抗体配列は、参照により本明細書に具体的に組み込まれる同時係属出願PCT US2017/038377に提供されている。
その組成物及びその使用方法は、CD3に結合し、CD3を介してシグナル伝達を活性化、例えば、CD3+T細胞の活性化する抗体のために提供される。抗体は、本明細書ではF2Bエピトープと呼ばれる場合があるF2B抗体が結合するCD3エピトープへの結合によって特徴付けられ。F2B抗体は、配列番号1のCDR配列のセット、及び配列番号19の固定軽鎖配列を含む。いくつかの実施形態において、F2Bエピトープに結合する抗体は、配列番号1〜18に示される配列以外の重鎖可変領域配列を含む。
本発明の理解を容易にするために、いくつかの用語を以下に定義する。
「含む」とは、列挙された要素が組成物/方法/キットにおいて必要とされることを意味するが、他の要素は、請求項の範囲内において組成物/方法/キットなどを形成するために含まれ得る。
本発明は、CD3に結合し、CD3を介してシグナル伝達を活性化(例えば、CD3+T細胞の活性化)する密接に関連する抗体のファミリーを提供する。ファミリー内の抗体は、本明細書で定義されるCDR配列のセットを含み、配列番号1〜18の提供されるVH配列によって例示される。抗体のファミリーは、臨床的治療剤(複数可)としての有用性に寄与する多くの利益を提供する。ファミリー内の抗体は、ある範囲の結合親和性を有するメンバーを含み、所望の親和性を有する特定の配列の選択を可能にする。親和性を微調整する能力は、治療される個体におけるCD3活性化のレベルを管理し、それによって、毒性を低減することが特に重要である。例えば、小さく豊富な腫瘍抗原(細胞当たり10,000分子未満)が標的化される場合、高い親和性のCD3結合剤(<30nM)が好ましいと予測される。非常に豊富な腫瘍抗原(細胞あたり50,000分子以上)が標的化される場合、低い親和性(>50nM)を有するCD3結合体が好ましい。親和性とは別に評価されるのは、T細胞に結合した場合には、サイトカインの放出、例えば、サイトカインの放出の減少が望ましい場合には、IL−2、IFNγなどの放出を誘導する抗体の傾向であり得る。
ここで、X5は、任意のアミノ酸であってもよく、いくつかの実施形態において、X5は、D、AまたはHであり、いくつかの実施形態において、X5は、Dである。X6は、任意のアミノ酸であってもよく、いくつかの実施形態において、X6は、DまたはNであり、いくつかの実施形態において、D6は、Dである。いくつかの実施形態において、ファミリー2の抗CD3抗体のCDR1配列は、配列番号1〜18、残基26〜33のいずれかに記載の配列を含む。
X9’は、任意のアミノ酸であってもよく、いくつかの実施形態において、X9’は、DまたはSであり、いくつかの実施形態において、X9’は、Dであり、
X11’は、任意のアミノ酸であってもよく、いくつかの実施形態において、X11’は、RまたはSであり、
X12’は、任意のアミノ酸であってもよく、いくつかの実施形態において、X12’は、LまたはRである。
を有し、X11’及びX12’は、上記で定義されている。いくつかの実施形態において、ファミリー2の抗CD3抗体のCDR3配列は、配列番号1〜18、残基97〜112のいずれかに記載の配列を含む。
抗体は、化学合成によって調製され得るが、典型的には、例えば、単一の組み換え宿主細胞においてタンパク質を構成するすべての鎖の共発現、または重鎖ポリペプチド及び抗体(例えば、ヒト抗体)の共発現などの組換えDNA技術の方法によって産生される。さらに、抗体の重鎖及び軽鎖は、単一のポリシストロニック発現ベクターを用いて、発現させることもできる。個々のポリペプチドの精製は、親和性(プロテインA)クロマトグラフィー、サイズ排除クロマトグラフィー及び/または疎水性相互作用クロマトグラフィーなどの標準的なタンパク質精製技術を用いて達成される。二重特異性物質はサイズ及び疎水性において十分に異なり、精製は標準的な手順を用いて実施され得る。
本発明の別の態様は、適切な薬学的に許容される担体と混合した本発明の1つ以上のタンパク質を含む医薬組成物を提供することである。本明細書で使用される薬学的に許容される担体は、限定されるものではないが、アジュバント、固体担体、水、緩衝液、もしくは治療成分を保持するために当該技術分野で使用される他の担体、またはそれらの組み合わせを例示する。
特に、抗原結合性組成物が治療される状態に適した多重特異性抗体である場合、例えば、関連するがん細胞の治療のために、1つの結合部分(関連する感染症の治療のために、目的の病原体に対する特異的な結合部分など)が腫瘍関連抗原に特異的に結合する場合、標的細胞を本発明の抗原結合性組成物と接触させることを含むレジメンにおいて、限定されるものではないが、感染症、自己免疫疾患、原発性または転移性がんなどを含む疾患を治療または軽減するための方法が提供される。そのような方法は、治療有効量または本発明の有効量の薬剤を、治療を必要とする対象に投与することを含み、限定されるものではないが、試薬と化学療法剤、放射線療法、または手術との組合せを含む。
ヒトIgH遺伝子座を、ヒトVH6−D−JH領域の下流に連結したラットC領域遺伝子の改変及び連結を含むいくつかの部分で構築し、組み立てた。次いで、ヒトVH遺伝子の別々のクラスターを有する2つのBACを、組み立てられた(ヒトVH6−D−JH−ラットC)断片をコードするBACと同時に注入した。
トランスジェニックヒト抗体レパートリーは、固有のL鎖と組み合わせて、多様な(VH−D−JH)n再編成を有するH鎖から生成された。このために、再編成したL鎖ヒトVk−Jk1−CkをDNAマイクロインジェクションによりラット生殖系列に組み込み、得られたトランスジェニック動物を、ヒトH鎖レパートリーを天然に発現する以前に記載されたラット株で飼育した(Osborn et al., 2013)。この新しいラット株は、OmniFlicと命名された。
ラットにおける抗原特異的重鎖抗体の生成のために、遺伝子操作されたラットを2つの方法で免疫化した。
CD69は、刺激によりアップレギュレートされるT細胞の細胞表面マーカーである。この実験では、Biocol(1.077g/ml密度)と標準的な方法を使用して、末梢血単核細胞(PBMC)をバフィーコートから単離した。単離したPBMCを完全培地中で48時間、2×107細胞/mlで前培養し、洗浄し、完全培地中で106細胞/mlに再懸濁した。これらの細胞を、組換えBCMAタンパク質でコーティングされたFACSチューブ(BD Falcon Corning)中で24時間インキュベートした。チューブは、組換えBCMAタンパク質を10マイクログラム/mlで一晩プレコートした。
図5に示される組換え抗原CD3イプシロン(配列番号23、細胞外ドメイン(ECD)残基22〜105)及びCD3デルタ(配列番号24、ECD残基23〜126)は、マウスIgG1 Fcとインフレームでクローン化され、一過性に共発現され、CHO細胞培養培地から精製された。CD3イプシロンサブユニットに追加されたC末端Hisタグは、標準プロトコールを使用したIMACによるCD3デルタ/イプシロン複合体のアフィニティーキャプチャーとイミダゾールによる溶出に使用された。配列EPEA(Cタグ)を含む第2の精製アフィニティータグをCD3デルタサブユニットのC末端に付加した。
表面残基の標識化
エピトープマッピングは、アミノ酸ヒスチジン、リジン、チロシン、システイン、セリン、トレオニン、及び遊離のN末端アミノ基のアクセス可能な側鎖と共有結合的に反応するジエチルピロカーボネートDEPC(参照)で標識した表面残基によって達成された。複合体形成を促進するために、30:1の抗体:抗原のモル比でDEPC標識を行った。DEPC標識抗体−抗原複合体をCapture Select C−tagアフィニティーマトリックス(Thermo Fisher Scientific)でキャプチャーし、過剰な抗体を徹底的に洗浄して除去した。親和性樹脂結合CD3デルタ/イプシロンは、トリプシン、キモトリプシン、及びエンドペプチダーゼGlu−Cで消化する前に、標準的な還元法及びアルキル化法にかけられた。放出されたペプチドをLC−MS/MSで分析した。CD3抗体F2Bの非存在下で同じDEPC標識化実験を行い、続いてアフィニティキャチャー、還元/アルキル化、プロテアーゼ消化を行った。各消化は三重に行われた。mAb CD3 F2Bの非存在下での質量分析に由来する配列カバレッジは高く、図6に示されている。
同じエピトープマッピングアプローチを使用して、治療用抗体OKT3とCD3デルタ/イプシロンの間の既知の相互作用(Salmeron, A., Sanchez−Madrid, F., Ursa, M. A., Fresno, M. & Alarcon, B. (1991) J. Immunol. 147, 3047−3052)を確認した。交差反応性抗体SP−34も特徴付けられている(米国特許第8,236,308号、2012年)。この抗体は、CD3イプシロンの拡張E−Fループ内のエピトープを認識し、結合にCD3デルタを必要としない。
Claims (37)
- CD3に結合する単離されたモノクローナル抗原結合タンパク質であって、CD3イプシロン(配列番号23):K73及びS83、ならびにCD3デルタ(配列番号24)K82及びC93から選択される少なくとも1つの残基を含むCD3上のエピトープに結合する、前記単離されたモノクローナル抗体。
- 前記CD3上のエピトープが、K82、E83、S84、T85、V86、Q87、V88、H89、Y90、R91、M92、C93によって定義されるCD3デルタの領域を含む、請求項1に記載の抗原結合タンパク質。
- 前記CD3上のエピトープが、K73、N74、I75、G76、S77、D78、E79、D80、H81、L82、S83によって定義されるCD3イプシロンの領域を含む、請求項1に記載の単離されたモノクローナル抗体。
- 前記エピトープが、CD3デルタ及びCD3イプシロンの両方の残基を含む立体配座エピトープを含む、請求項1〜3のいずれか1項に記載の抗原結合タンパク質。
- 前記立体配座エピトープが、残基CD3ε K73及びS83;CD3δ K82及びC93のそれぞれを含む、請求項1〜4のいずれか1項に記載の抗原結合タンパク質。
- 前記抗体が、カニクイザルCD3タンパク質と交差反応しない、請求項1〜5のいずれか1項に記載の抗原結合タンパク質。
- 前記抗原結合タンパク質が、T細胞に結合する際に、F2B抗体で観察される最大サイトカイン放出の約200%以下であるサイトカイン放出を誘導する、請求項1〜6のいずれか1項に記載の抗原結合タンパク質。
- CD3に対する結合親和性が50nM以上である、請求項1〜7のいずれか1項に記載の抗原結合タンパク質。
- 前記単離されたモノクローナル抗原結合タンパク質がヒト抗体である、請求項1〜8のいずれか1項に記載の抗原結合タンパク質。
- 前記単離されたモノクローナル抗原結合タンパク質がヒト化抗体である、請求項1〜8のいずれか1項に記載の抗原結合タンパク質。
- 軽鎖の可変領域が配列19中のCDR配列のセットを含む、請求項1〜10のいずれか1項に記載の抗原結合タンパク質。
- 可変軽鎖ドメインが、配列番号19のアミノ酸配列を含む、請求項1〜11のいずれか1項に記載の抗原結合タンパク質。
- 前記抗体が、配列番号1〜18に示されるもの以外のCDR配列のセットを含む、請求項1〜12のいずれか1項に記載の抗原結合タンパク質。
- Fc領域をさらに含む、請求項1〜13のいずれか1項に記載の抗原結合タンパク質。
- 前記Fc領域が、エフェクター機能を低下させるように操作されている、請求項14に記載の抗原結合タンパク質。
- 前記タンパク質が一本鎖である、請求項1〜15のいずれか1項に記載の抗原結合タンパク質。
- 前記タンパク質が二本鎖またはその倍数である、請求項1〜15のいずれか1項に記載の抗原結合タンパク質。
- 前記タンパク質が三本鎖である、請求項1〜15のいずれか1項に記載の抗原結合タンパク質。
- 前記タンパク質が三本鎖であり、両方の抗原結合性アームが抗体の重鎖及び軽鎖を含む、請求項1〜15のいずれか1項に記載の抗原結合タンパク質。
- 前記タンパク質が、CD3以外のタンパク質に特異的な可変重鎖ドメインをさらに含む、請求項1〜15のいずれか1項に記載の抗原結合タンパク質。
- 前記タンパク質が、CD3以外のタンパク質に特異的な可変重鎖ドメインをさらに含み、
活性化アッセイにおいてT細胞と接触させたとき、前記抗原結合タンパク質が、参照抗CD3抗体と比較して、IL−2及びIL−6の一方または両方の低下したレベルの放出を誘導し、
腫瘍細胞及びヒトT細胞を用いた標準インビトロアッセイにおいて、30%を超える腫瘍細胞傷害性を誘導する、請求項1〜20のいずれか1項に記載の抗原結合タンパク質。 - CD3以外のタンパク質に特異的な前記可変重鎖ドメインが重鎖のみのドメインである、請求項21に記載の抗原結合タンパク質。
- CD3以外のタンパク質に特異的な前記可変重鎖ドメインが軽鎖可変領域をさらに含む、請求項21に記載の抗原結合タンパク質。
- 前記軽鎖可変領域が、前記CD3結合領域の軽鎖可変領域と同一である、請求項21に記載の抗原結合タンパク質。
- 前記CD3以外のタンパク質が、腫瘍関連抗原である、請求項21〜24のいずれか1項に記載の抗原結合タンパク質。
- 前記CD3以外のタンパク質が、病原体抗原である、請求項21〜24のいずれか1項に記載の抗原結合タンパク質。
- 前記CD3以外のタンパク質が、免疫調節タンパク質である、請求項21〜24のいずれか1項に記載の抗原結合タンパク質。
- 請求項1〜27のいずれか1項に記載の抗原結合タンパク質を含む医薬組成物。
- 単位用量製剤中の、請求項28に記載の医薬組成物。
- 請求項1〜27のいずれか1項に記載の抗原結合タンパク質をコードするポリヌクレオチド。
- 請求項30に記載のポリヌクレオチドを含むベクター。
- 請求項31に記載のベクターを含む細胞。
- 前記タンパク質の発現を許容する条件下で、請求項32に記載の細胞を増殖させることと、前記タンパク質を前記細胞及び/または細胞培養培地から単離することと、を含む、請求項1〜27のいずれか1項に記載の抗原結合タンパク質の製造方法。
- 有効量の請求項1〜27のいずれか1項に記載の抗原結合タンパク質、または請求項28に記載の医薬組成物を個体に投与することを含む、治療方法。
- 疾患の治療のための医薬の調製における、請求項1〜27のいずれか1項に記載の抗原結合タンパク質の使用。
- 疾患の治療のためにおける使用のための、請求項1〜27のいずれか1項に記載の抗原結合タンパク質。
- 前記個体がヒトである、請求項34〜36のいずれか1項に記載の方法または使用。
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BR112020013086A2 (pt) | 2020-12-08 |
KR20200104364A (ko) | 2020-09-03 |
WO2019133761A1 (en) | 2019-07-04 |
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US20240117050A1 (en) | 2024-04-11 |
RU2020124623A (ru) | 2022-01-27 |
EP3732199A1 (en) | 2020-11-04 |
AU2018395273A1 (en) | 2020-08-13 |
CN111886250A (zh) | 2020-11-03 |
US20200339685A1 (en) | 2020-10-29 |
SG11202006042SA (en) | 2020-07-29 |
JP2024045150A (ja) | 2024-04-02 |
MX2020006715A (es) | 2020-08-20 |
IL275628A (en) | 2020-08-31 |
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