JP6705785B2 - トロンビン結合性抗体分子及びその使用 - Google Patents
トロンビン結合性抗体分子及びその使用 Download PDFInfo
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- JP6705785B2 JP6705785B2 JP2017165700A JP2017165700A JP6705785B2 JP 6705785 B2 JP6705785 B2 JP 6705785B2 JP 2017165700 A JP2017165700 A JP 2017165700A JP 2017165700 A JP2017165700 A JP 2017165700A JP 6705785 B2 JP6705785 B2 JP 6705785B2
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Description
(1)トロンビンエキソサイト1に結合し、そして
(2)配列番号2のVHドメインおよび/または配列番号6のVLドメイン;配列番号5のHCDR3;それぞれ配列番号3、4、7、8または9のHCDR1、HCDR2、LCDR1、LCDR2、またはLCDR3;それぞれ配列番号3、4および5のHCDR1、HCDR2およびHCDR3配列を含むVHドメイン;
および/またはそれぞれ配列番号3、4および5のHCDR1、HCDR2およびHCDR3配列を含むVHドメインならびに配列番号7、8および9のLCDR1、LDR2およびLCDR3配列を含むVLドメインを含む抗体分子が、エキソサイト1へ結合するのを競合するものであってもよい。
HCDR1、HCDR2およびHCDR3を含む親VHドメインのアミノ酸配列中に1つ以上のアミノ酸を付加、削除、置換または挿入することにより、親VHドメインのアミノ酸配列変異体であるVHドメインを設け、ここで、HCDR1、HCDR2およびHCDR3はそれぞれ配列番号3、4および5のアミノ酸配列を有し;そして
場合により、このようにして設けたVHドメインを、1つ以上のVLドメインと結合して1つ以上のVH/VLの組み合わせを設け;そして
親VHドメインのアミノ酸配列変異体である前記VHドメインまたは1つもしくは複数のVH/VLの組み合わせを検査して、トロンビンのエキソサイト1エピトープに対する抗体抗原結合ドメインを同定する、
ことを含んでもよい。
VHドメインをコードする出発核酸または各々がVHドメインをコードする核酸の出発レパートリーを設け、ここで、1つまたは複数のVHドメインは、置換されるべきHCDR1、HCDR2および/またはHCDR3を含むか、あるいはHCDR1、HCDR2および/またはHCDR3コード領域を欠くかのいずれかであり;
前記出発核酸または出発レパートリーを、それぞれ配列番号3、4および5のアミノ酸配列を有するHCDR1、HCDR2、および/またはHCDR3のアミノ酸配列の変異をコードするかまたは当該変異により生産した1つまたは複数の供与核酸に結合して、前記1つまたは複数の供与核酸が出発核酸または出発レパートリーのCDR1、CDR2および/またはCDR3領域に挿入されるようにすることで、VHドメインをコードする核酸の生成レパートリーを設け;
前記生成レパートリーの核酸を発現させて生成VHドメインを生産し;
場合により、前記生成VHドメインを1つ以上のVLドメインと結合し;
トロンビンのエキソサイト1に結合する抗体分子であって、生成VHドメインそして場合によりVLドメインを含む抗体分子を選択し;そして
前記抗体分子またはそれをコードする核酸を回収する、
ことを含んでもよい。
凝固スクリーニングを、患者の血漿試料について行った。凝固検査は、頭部損傷後の硬膜下血腫を負った患者で実施した。血腫は、介入なしに自然消失した。出血について過去の病歴はなく、患者が血腫を示してからの4年間、それ以外の出血エピソードはなかった。結果を表1に示す。
C57BL/6マウスを麻酔した。(化合物を注入するため)カテーテルを頸動脈に挿入した。FITC標識したフィブリノゲン(2mg/ml)を頸動脈から注入した。PBS(対照)またはIgAも、頸動脈から注射した。大腿静脈を露出し、凝血を誘導するために3分間10%FeCl3(飽和させた長さ3mmの吸い取り紙)を付した。
尾クリップアッセイを、400nMのIgA(血中最終濃度、約6mg/Kgの用量に相当)またはPBSのいずれかを注射した野生型C57BL/6雄マウスで行った。注射から15分後に尾を直径3mmで切断し、その後10分にわたり失血をモニターした。総失血は、抗エキソサイト1IgAによる処理によって影響を受けないことが分かった(図17)。
FeCl3損傷性頸動脈閉塞試験を、9週齢の野生型C57BL/6雄マウスで実施した。マウスは、5%FeCl3による損傷の15分前に、400nM抗IIa型IgA(血中最終濃度、約6mg/Kgの用量に相当)またはPBSを2分間注射した。その後、血流をドップラーによりモニターし、閉塞までの時間を計測した。「血塊」は、血流が典型的には0.1ml/min未満の値に減少し、そして減少したままであるという安定した閉塞性血栓であると定義した。対照マウスでは、安定した血塊が、損傷後約20分で形成されることが観察された(図18A)。しかし、400nM抗IIa型IgAで処理したマウスの大多数は、安定した血塊を形成できず、血塊は速やかに溶解し、繰り返し溶解するか、または全く形成されなかったというトレース(trace)を示した。3つの代表的なトレースを、図18B〜18Dに示す。
前述の患者において同定したIgA分子を、標準的な技術を用いてIgGとして再構成(re−formatted)した。
GYTLTEAAIH
GLDPQDGETVYAQQFKG
GDFSEFEPFSMDYFHF
RASQNVSSFLA
DASSRAT
QQRRSWPPLT
Claims (18)
- それぞれ、配列番号3、4および5の配列を有するHCDR1、HCDR2およびHCDR3を含むVHドメイン、ならびにそれぞれ配列番号8および9の配列を有するLCDR2およびLCDR3および配列番号6のN28に相当する1アミノ酸残基に置換を導入する変異によりグリコシル化部位が消去された配列番号7の配列を有するLCDR1を含むVLドメインを含む、トロンビンのエキソサイト1領域に特異的に結合する単離された抗体分子。
- トロンビン活性を阻害する、請求項1に記載の抗体分子。
- 配列番号2のアミノ酸配列を有するVHドメインを含む、請求項1又は2に記載の抗体分子。
- アミノ酸N28における1アミノ酸の置換によりグリコシル化部位が消去された配列番号6のアミノ酸配列を有するVLドメインを含む、請求項1〜3のいずれか1項に記載の抗体分子。
- 配列番号2のアミノ酸配列を有するVHドメイン、及びアミノ酸N28における1アミノ酸の置換によりグリコシル化部位が消去された配列番号6のアミノ酸配列を有するVLドメインを含む、請求項1〜3のいずれか1項に記載の抗体分子。
- 完全抗体である、請求項1〜5のいずれか1項に記載の抗体分子。
- IgAまたはIgGである、請求項6に記載の抗体分子。
- 前記抗体分子は抗体の断片であり、該断片はトロンビンのエキソサイト1領域に特異的に結合する、請求項1〜5のいずれか1項に記載の抗体分子。
- モノクローナル抗体である、請求項1〜5のいずれか1項に記載の抗体分子。
- 請求項1〜9のいずれか1項に記載の抗体分子および医薬的に許容される賦形剤を含む、医薬組成物。
- トロンビン介在性の状態の治療に使用するための医薬の製造における請求項1〜9のいずれか1項に記載の抗体分子の使用。
- トロンビン介在性の状態は血栓性の状態である、請求項11に記載の使用。
- 血栓性の状態は、血栓症または塞栓症である、請求項12に記載の使用。
- トロンビン介在性の状態は、炎症、感染症、腫瘍の増殖、腫瘍の転移または認知症である、請求項11に記載の使用。
- 請求項1〜9のいずれか1項に記載の抗体分子を含む、トロンビン介在性の状態を治療するための医薬組成物。
- トロンビン介在性の状態は血栓性の状態である、請求項15に記載の医薬組成物。
- 血栓性の状態は、血栓症または塞栓症である、請求項16に記載の医薬組成物。
- トロンビン介在性の状態は、炎症、感染症、腫瘍の増殖、腫瘍の転移または認知症である、請求項15に記載の医薬組成物。
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