JP2022513008A - 融合タンパク質およびその使用 - Google Patents
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Abstract
Description
a)上記の抗体または上記のその抗原結合断片における1つまたは複数のアミノ酸が置換、欠失または付加されたタンパク質またはポリペプチド、および
b)上記の抗体または上記のその抗原結合断片と少なくとも90%の配列相同性を持つタンパク質またはポリペプチドからなる群から選ばれる。
一方、本発明は、第1結合ドメインと第2結合ドメインを含み得る融合タンパク質を提供する。上記の第1結合ドメインは、腫瘍関連抗原に特異的に結合し、上記の第2結合ドメインは、CD47タンパク質に特異的に結合し、SEQ ID NO:50で表される配列に比べて、33位~149位における1つまたは複数(例えば、1~2つ、1~3つ、1~4つ、1~5つ、1~6つ、1~7つ、1~8つ、1~9つ、1~10つまたはより多く)の位置にアミノ酸残基の置換、欠失または付加を含むヒトSIRPα変異体1の突然変異体を含む。本発明に記載の融合タンパク質は、腫瘍関連抗原とCD47タンパク質に同時に特異的に結合することによって、腫瘍および/あるいは自己免疫疾患の治療に機能する。
本発明において、上記の突然変異体(例えば、CD47タンパク質に特異的に結合するヒトSIRPα変異体1の突然変異体)は、R22、I29、I61、V63、E77、Q82、K83、E84、V93、D95、D96、K98、N100、R107、G109およびV132からなる群から選ばれる1つまたは複数(例えば、1~2つ、1~3つ、1~4つ、1~5つ、1~6つ、1~7つ、1~8つ、1~9つ、1~10つまたはより多く)のアミノ酸残基にアミノ酸置換を含む。
本発明において、上記の第1結合ドメインは、抗体またはその抗原結合断片もしくは変異体を含み得る。例えば、上記の抗体は、モノクローナル抗体、一本鎖抗体、キメラ抗体、ヒト化抗体と完全ヒト化抗体からなる群から選ばれる。例えば、上記の抗原結合断片は、Fab、Fab'、(Fab')2、F(ab)2、dAb、散在している相補性決定領域CDR、FvおよびscFvからなる群から選ばれる。
本発明に記載の抗体またはその抗原結合断片もしくは変異体は、CD38タンパク質に特異的に結合することによって、腫瘍細胞の殺傷および/または腫瘍成長の抑制を行える。例えば、上記の腫瘍は、CD38陽性の腫瘍を含み得る。例えば、上記のCD38陽性の腫瘍は、骨髄腫、リンパ腫および白血病からなる群から選ばれる。又、例えば、上記の腫瘍は、非ホジキンリンパ腫およびホジキンリンパ腫からなる群から選ばれる。上記の腫瘍の細胞は、Raji細胞、Daudi細胞、Ramos細胞およびRPMI8226細胞からなる群から選ばれる。本発明において、上記の抗体、その抗原結合断片または変異体は、多発性骨髄腫、リンパ腫、白血病、非ホジキンリンパ腫およびホジキンリンパ腫細胞の殺傷または多発性骨髄腫、リンパ腫、白血病、非ホジキンリンパ腫およびホジキンリンパ腫成長の抑制を行える。
本発明に記載の抗体またはその抗原結合断片もしくは変異体は、AXLに特異的に結合することによって腫瘍細胞の殺傷および/または腫瘍成長の抑制を行える。例えば、上記のAXLは、ヒトAXLであってよい。
本発明に記載の抗体またはその抗原結合断片もしくは変異体は、Trop2に特異的に結合することによって腫瘍細胞の殺傷および/または腫瘍成長の抑制を行える。例えば、上記のTrop2は、ヒトTrop2であってよい。
本発明において、上記の第1結合ドメインは、上記の第2結合ドメインのN末端に位置してよい。例えば、上記の第1結合ドメインのC末端は、リンカーによって上記の第2結合ドメインのN末端に間接に連結してよい。いくつかの場合において、上記の第1結合ドメインのC末端は、第2結合ドメインのN末端に直接に(例えば、フレームワーク内)連結してもよい。
他方、本発明は、上記の融合タンパク質または上記の免疫複合体をコード化する1つまたは複数の単離された核酸分子を提供する。例えば、上記の1種または複数種の核酸分子における各核酸分子が、完全な上記の抗体またはその抗原結合断片をコード化することができるし、その一部(例えば、HCDR1-3、LCDR1-3、VL、VH、軽鎖あるいは重鎖のうちの1種または複数種)をコード化することもできる。
他方、本発明は、上記の融合タンパク質を含む免疫複合体を提供する。例えば、上記の免疫複合体は、本発明に記載の融合タンパク質が細胞毒性薬、放射性毒性薬剤(例えば、放射性同位体)および/または免疫阻害剤(例えば、免疫応答を抑制することなどによって細胞を殺傷するいかなる薬剤)などを含むが限定されない1種または複数種の治療薬と複合する融合タンパク質-薬物複合体(ADC)であってよい。いくつかの実施形態において、上記の治療薬は、腫瘍関連疾患または病症を治療可能な治療薬であってよい。
実施例1. 活性に対する異なるリンカーの選択による影響
1.1 異なるリンカーを用いて融合タンパク質を調製する
図1に示される融合タンパク質構造を参照して、抗CD38ヒト化抗体SG003、SIRPα変異体1の突然変異体M91(SEQ ID: NO 62)を例として、N末端からC末端にかけて異なるリンカーを選んで、順次にSG003、リンカーとN末端がそれぞれSG003の重鎖のC末端に連結した2つのM91に連結し、融合タンパク質の生物学的活性に対する異なるリンカーによる影響を検討した。
(1)SG003を対照とし、融合タンパク質とCD38の結合活性に対してELISA評価を行った。
(1)図5の原理を参照して、抗CD38ヒト化抗体SG003を対照とし、両抗原CD38およびCD47に対する融合タンパク質SG3847L1およびSG3847L2による同時結合の生物学的活性に対してELISA分析を行った。
まず、実験に必要な標的細胞(Raji細胞)を、密度が2×105個細胞/mLになるように調整して、ADCC緩衝液(フェノールレッド無しのMEM培養液+1%FBS)に再懸濁させ、96ウェルプレート(50μL/ウェル)に入れた。そして、各ウェルに、濃度の異なるSG003、SG3847L1およびSG3847L2を100μL加えて均一に混合後、37℃、5%CO2のインキュベータに30min培養した。また、実験に必要なエフェクター細胞NK92MI-CD16a(華博生物)を、密度が1.2×106個細胞/mLになるように調整して、標的細胞:エフェクター細胞=1:6になるように、標的細胞付きのウェルに添加した。均一に混合後、37℃、5%CO2のインキュベータに6h培養してから、96ウェルプレートにおける原液を100μL/ウェルで排出し、LDH検出キット(CytotoxicityDetectionKit、Roche)におけるLDH反応混合物を100μL/ウェルで添加し、37℃で10min反応した。また、反応停止液を50μL/ウェルで入れて、軽く均一に混合した。マイクロプレートリーダーによって、492nmにおけるODを測定すると共に、650nmにおけるODをバックグラウンド値として測定した。実験中、同時に、対照1がADCC緩衝液、対照2が標的細胞+ADCC緩衝液、対照3が標的細胞+溶解バッファー+ADCC緩衝液、対照4が標的細胞+エフェクター細胞+ADCC緩衝液である対照群をセットした。特異性殺傷率%=((実験群-対照4)/(対照3-対照2))×100%になった。用量反応曲線は、GraphPad Prism Version 5でデータ分析を行った。
SS002M91を対照とし、融合タンパク質SG3847L1、SG3847L2によるCD47タンパク質とSIRPαの相互作用遮断の生物学的活性を評価した。
図1の融合タンパク質構造および実施例1の結果を参照して、抗AXL抗体(C6G12)と抗Trop2(SG701)抗体を例として、異なる標的抗体による融合タンパク質の生物学的活性への影響を検討し、用いられるリンカーがリンカー2であった。
(1)異なる抗原に対するヒト化抗体を対照とし、対応する融合タンパク質と関連抗原の結合活性に対してELISA評価を行った。
異なる抗原に対するヒト化抗体を対照とし、二重抗原に対する融合タンパク質による同時結合の生物学的活性に対してELISA分析を行った。
CB17 SCIDマウスに、尾静脈よりRaji-Luc細胞を接種し、融合タンパク質SG3847L1の抗腫瘍活性効果を評価するように、腫瘍モデルを作成した。
Claims (61)
- 腫瘍関連抗原に特異的に結合する第1結合ドメイン、およびSEQ ID NO:50で表される配列に比べて、33位~149位における1つまたは複数の位置にアミノ酸残基の置換、欠失または付加を含むヒトSIRPα変異体1の突然変異体を含むCD47タンパク質に特異的に結合する第2結合ドメインを持つ、
融合タンパク質。 - 前記突然変異体は、R22、I29、I61、V63、E77、Q82、K83、E84、V93、D95、D96、K98、N100、R107、G109およびV132からなる群から選ばれる1つまたは複数のアミノ酸残基にアミノ酸置換を有する、
請求項1に記載の融合タンパク質。 - 前記突然変異体は、
(1)I61、V63、E77、E84、V93、L96、K98、N100およびV132、
(2)I61、E77、Q82、K83およびE84、
(3)I61、V63、K83、E84およびV132、
(4)I61、E77、E84、R107およびV132、
(5)I61、V63、E77、K83、E84およびN100、
(6)I61、E77、Q82、K83、E84およびR107、
(7)I61、E77、Q82、E84、V93、L96、N100、R107、G109およびV132、
(8)I61、E77、Q82、K83、E84およびV132、
(9)I61、
(10)I61、D95、L96、G109およびV132、
(11)I61、D95、L96、K98、G109およびV132、
(12)I61、E77、E84、V93、R107およびV132、
(13)E77、L96、N100、G109およびV132、
(14)I61、V63、Q82、E84、D95、L96、N100およびV132、
(15)I61、E77、Q82、K83、E84、V93、D95、L96、K98、N100およびV132、
(16)I61、E77、Q82、K83、E84およびV93、
(17)I61、V63、E77、K83、E84、D95、L96、K98およびN100、
(18)I61、V63、E77、K83、D95、L96、K98、N100およびG109、
(19)I61、E77、Q82、E84、V93、D95、L96、K98およびN100、ならびに、
(20)I61、V63、E77、Q82およびE84からなる群から選ばれるアミノ酸残基にアミノ酸置換を有する、
請求項2に記載の融合タンパク質。 - 前記突然変異体は、R22C、I29L、I61L/V/F、V63I、E77I/N/Q/K/H/M/R/N/V/L、Q82S/R/G/N、K83R、E84K/H/D/R/G、V93L/A、D95H/R/E、D96S/T、K98R、N100G/K/D/E、R107N/S、G109R/HおよびV132L/R/I/Sからなる群から選ばれる1つまたは複数のアミノ酸置換を有する、
請求項1~3のいずれか1項に記載の融合タンパク質。 - 前記突然変異体は、
(1)I61L、V63I、E77I、E84K、V93L、L96S、K98R、N100GおよびV132L、
(2)I61V、E77N、Q82S、K83RおよびE84H、
(3)I61F、V63I、K83R、E84KおよびV132I、
(4)I61L、E77Q、E84D、R107NおよびV132I、
(5)I61L、V63I、E77K、K83R、E84DおよびN100G、
(6)I61V、E77H、Q82R、K83R、E84HおよびR107S、
(7)I61L、E77I、Q82G、E84R、V93L、L96T、N100G、R107S、G109RおよびV132R、
(8)I61L、E77M、Q82G、K83R、E84DおよびV132L、
(9)I61L、
(10)I61F、D95H、L96S、G109HおよびV132S、
(11)I61F、D95H、L96S、K98R、G109HおよびV132S、
(12)I61L、E77Q、E84D、V93A、R107NおよびV132I、
(13)E77K、L96S、N100K、G109HおよびV132L、
(14)I61L、V63I、Q82G、E84G、D95R、L96S、N100DおよびV132I、
(15)I61L、E77R、Q82N、K83R、E84G、V93L、D95E、L96T、K98R、N100DおよびV132L、
(16)I61V、E77N、Q82S、K83R、E84HおよびV93A、
(17)I61V、V63I、E77V、K83R、E84D、D95E、L96T、K98RおよびN100E、
(18)I61L、V63I、E77V、K83R、D95E、L96S、K98R、N100DおよびG109R、
(19)I61V、E77L、Q82G、E84G、V93L、D95E、L96T、K98RおよびN100G、ならびに、
(20)I61L、V63I、E77N、Q82GおよびE84Gからなる群から選ばれるアミノ酸置換を有する、
請求項4に記載の融合タンパク質。 - 前記突然変異体は、SEQ ID NO:51-70のいずれかで表されるアミノ酸配列を有する、
請求項1~5のいずれか1項に記載の融合タンパク質。 - 前記第1結合ドメインは、抗体またはその抗原結合断片もしくは変異体を含む、
請求項1~6のいずれか1項に記載の融合タンパク質。 - 前記抗体は、モノクローナル抗体、一本鎖抗体、キメラ抗体、ヒト化抗体および完全ヒト化抗体からなる群から選ばれる、
請求項7に記載の融合タンパク質。 - 前記抗原結合断片は、Fab、Fab’、F(ab')2、F(ab)2、dAb、散在している相補性決定領域CDR、FvおよびscFvからなる群から選ばれる、
請求項7~8のいずれか1項に記載の融合タンパク質。 - 前記抗体またはその抗原結合断片の前記変異体は、
a)前記抗体または前記その抗原結合断片における1つまたは複数のアミノ酸が置換、欠失または付加されたタンパク質またはポリペプチド、および
b)前記抗体または前記その抗原結合断片と少なくとも90%の配列相同性を持つタンパク質またはポリペプチドからなる群から選ばれる、
請求項7~9のいずれか1項に記載の融合タンパク質。 - 前記腫瘍関連抗原は、非固形腫瘍および/または固形腫瘍関連の腫瘍関連抗原を含む、
請求項1~10のいずれか1項に記載の融合タンパク質。 - 前記腫瘍関連抗原は、CD38、AXLおよびTrop2からなる群から選ばれる、
請求項1~11のいずれか1項に記載の融合タンパク質。 - 前記第1結合ドメインは、CD38抗体またはその抗原結合断片もしくは変異体を含む、
請求項12に記載の融合タンパク質。 - 前記CD38はヒトCD38である、
請求項13に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 4、SEQ ID NO: 5およびSEQ ID NO: 6であるHCDR1-3を含有する抗体重鎖またはその断片を含む、
請求項7~14のいずれか1項に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、SEQ ID NO: 8のようなアミノ酸配列を有する重鎖可変領域VHを含む、
請求項15に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、IgGを有する重鎖定常領域を含む、
請求項15~16のいずれか1項に記載の融合タンパク質。 - 前記IgGは、IgG1およびIgG4からなる群から選ばれる、
請求項17に記載の融合タンパク質。 - 前記抗体重鎖は、SEQ ID NO: 13、SEQ ID NO: 17、SEQ ID NO: 19およびSEQ ID NO: 21からなる群から選ばれるアミノ酸配列のうちのいずれか1つを有する、
請求項15~18のいずれか1項に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 1、SEQ ID NO: 2およびSEQ ID NO: 3であるLCDR1-3を含有する抗体軽鎖またはその断片を含む、
請求項7~19のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、SEQ ID NO: 7のようなアミノ酸配列を有する軽鎖可変領域VLを含む、
請求項20に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、Igκを有する軽鎖定常領域を含む、
請求項20~21のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖は、SEQ ID NO: 11、SEQ ID NO: 16、SEQ ID NO: 18およびSEQ ID NO: 20からなる群から選ばれるアミノ酸配列のうちのいずれか1つを有する、
請求項20~22のいずれか1項に記載の融合タンパク質。 - 前記第1結合ドメインは、AXL抗体またはその抗原結合断片もしくは変異体を含む、
請求項12に記載の融合タンパク質。 - 前記AXLはヒトAXLである、
請求項24に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 25、SEQ ID NO: 26およびSEQ ID NO: 27であるHCDR1-3を含有する抗体重鎖またはその断片を含む、
請求項24~25のいずれか1項に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、SEQ ID NO: 29のようなアミノ酸配列を有する重鎖可変領域VHを含む、
請求項26に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、IgGを有する重鎖定常領域を含む、
請求項26~27のいずれか1項に記載の融合タンパク質。 - 前記IgGは、IgG1およびIgG4からなる群から選ばれる、
請求項28に記載の融合タンパク質。 - 前記抗体重鎖は、SEQ ID NO: 34のようなアミノ酸配列を有する、
請求項24~29のいずれか1項に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 22、SEQ ID NO: 23およびSEQ ID NO:24であるLCDR1-3を含有する抗体軽鎖またはその断片を含む、
請求項24~30のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、SEQ ID NO: 28のようなアミノ酸配列を有する軽鎖可変領域VLを含む、
請求項31に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、Igκを有する軽鎖定常領域を含む、
請求項31~32のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖は、SEQ ID NO: 32のようなアミノ酸配列を有する、
請求項31~33のいずれか1項に記載の融合タンパク質。 - 前記第1結合ドメインは、Trop2抗体またはその抗原結合断片もしくは変異体を含む、
請求項12に記載の融合タンパク質。 - 前記Trop2はヒトTrop2である、
請求項35に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 39、SEQ ID NO: 40およびSEQ ID NO: 41であるHCDR1-3を含有する抗体重鎖またはその断片を含む、
請求項35~36のいずれか1項に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、SEQ ID NO: 43のようなアミノ酸配列を有する重鎖可変領域VHを含む、
請求項37に記載の融合タンパク質。 - 前記抗体重鎖またはその断片は、IgGを有する重鎖定常領域を含む、
請求項37~38のいずれか1項に記載の融合タンパク質。 - 前記IgGは、IgG1およびIgG4からなる群から選ばれる、
請求項39に記載の融合タンパク質。 - 前記抗体重鎖は、SEQ ID NO: 48のようなアミノ酸配列を有する、
請求項37~40のいずれか1項に記載の融合タンパク質。 - 前記抗体は、アミノ酸配列が順次にSEQ ID NO: 36、SEQ ID NO: 37およびSEQ ID NO: 38であるLCDR1-3を含有する抗体軽鎖またはその断片を含む、
請求項35~41のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、SEQ ID NO: 42のようなアミノ酸配列を有する軽鎖可変領域VLを含む、
請求項42に記載の融合タンパク質。 - 前記抗体軽鎖またはその断片は、Igκを有する軽鎖定常領域を含む、
請求項42~43のいずれか1項に記載の融合タンパク質。 - 前記抗体軽鎖は、SEQ ID NO:46のようなアミノ酸配列を有する、
請求項42~44のいずれか1項に記載の融合タンパク質。 - 前記第1結合ドメインは、前記第2結合ドメインのN末端に位置する、
請求項1~45のいずれか1項に記載の融合タンパク質。 - 前記融合タンパク質は、さらに、前記第1結合ドメインのC末端かつ前記第2結合ドメインのN末端にあるリンカーを有する、
請求項1~46のいずれか1項に記載の融合タンパク質。 - 前記リンカーは、SEQ ID NO:73-74のいずれかで表されるアミノ酸配列を有する、
請求項47に記載の融合タンパク質。 - 少なくとも2つの前記第2結合ドメインを持つ、
請求項1~48のいずれか1項に記載の融合タンパク質。 - 各前記第2結合ドメインは、それぞれ前記第1結合ドメインのC末端に位置する、
請求項49に記載の融合タンパク質。 - 請求項1~50のいずれか1項に記載の融合タンパク質を含む、
免疫複合体。 - 請求項1~50のいずれか1項に記載の融合タンパク質または請求項51に記載の免疫複合体をコード化する、
1つまたは複数の単離された核酸分子。 - 請求項52に記載の核酸分子を含む、
1つまたは複数のベクター。 - 請求項1~50のいずれか1項に記載の融合タンパク質、請求項51に記載の免疫複合体または請求項52に記載の核酸分子、および任意選択で薬学的に許容可能な賦形剤を含む、
組成物。 - 請求項1~50のいずれか1項に記載の融合タンパク質、請求項51に記載の免疫複合体、請求項52に記載の核酸分子、または請求項53に記載のベクターを含む、
細胞。 - 前記融合タンパク質を発現可能な条件で、請求項55に記載の細胞を培養することを含む、
請求項1~50のいずれか1項に記載の融合タンパク質の調製方法。 - 腫瘍あるいは自己免疫疾患の治療のための医薬品の調製における請求項1~50のいずれか1項に記載の融合タンパク質、請求項51に記載の免疫複合体、請求項52に記載の核酸分子、請求項53に記載のベクター、請求項54に記載の組成物、または請求項55に記載の細胞の使用。
- 前記腫瘍は、非固形腫瘍と固形腫瘍を含む、
請求項57に記載の使用。 - 前記腫瘍は、多発性骨髄腫、白血病、非ホジキンリンパ腫、ホジキンリンパ腫、神経膠腫、胚細胞腫瘍、肉腫、中皮腫、胎盤腫、脳癌、骨癌、皮膚がん、鼻咽頭癌、肺癌、口腔がん、食道がん、胃癌、肝臓がん、膵臓癌、前立腺がん、腸癌、乳がん、子宮頚部癌、卵巣癌および精巣癌を含む、
請求項57に記載の使用。 - 前記自己免疫疾患は、慢性リンパ球性甲状腺炎、甲状腺機能亢進症、インスリン依存型糖尿病、重症筋無力症、慢性潰瘍性結腸炎、慢性萎縮性胃炎合併悪性貧血、グッドパスチャー症候群、尋常性天疱瘡、類天疱瘡、原発性胆汁性肝硬変症、多発性脳脊髄硬化症、急性特発性多発神経炎、全身性エリテマトーデス、関節リウマチ、強皮症および結節性多発動脈炎を含む、
請求項57に記載の使用。 - 必要のある被験者に、有効量の請求項1~50のいずれか1項に記載の融合タンパク質、請求項51に記載の免疫複合体、請求項52に記載の核酸分子、請求項53に記載のベクター、請求項54に記載の組成物、または請求項55に記載の細胞を投与することを含む、
CD47タンパク質とSIRPαの相互作用を遮断する方法。
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