JP2022538531A - Cthrc1に特異的な新規抗体及びその使用 - Google Patents
Cthrc1に特異的な新規抗体及びその使用 Download PDFInfo
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Abstract
Description
アラニン Ala,A
アルギニン Arg,R
アスパラギン Asn,N
アスパラギン酸 Asp,D
システイン Cys,C
グルタミン酸 Glu,E
グルタミン Gln,Q
グリシン Gly,G
ヒスチジン His,H
イソロイシン Ile,I
ロイシン Leu,L
リシン Lys,K
メチオニン Met,M
フェニルアラニン Phe,F
プロリン Pro,P
セリン Ser,S
トレオニン Thr,T
トリプトファン Trp,W
チロシン Tyr,Y
バリン Val,V
実施例1-1:4H5及び9E6の選択
CTHRC1タンパク質をターゲットとする抗体を開発するために、CTHRC1タンパク質に結合するマウスモノクローナル抗体を選択した。具体的には、CTHRC1タンパク質をマウスに注射し、CTHRC1に対する抗体が生成されたら、マウスの脾臓からBリンパ球を分離した。分離したBリンパ球をCTHRC1タンパク質がコーティングされた96ウェルプレート(well plate)にリンパ球が1つのみ入るように希釈した。その後、HRP(Horseradish peroxidase)が標識された抗マウス(anti-mouse)抗体を用いて、CTHRC1タンパク質に結合するBリンパ球をスクリーニングした。
実施例1-1で選択した抗CTHRC1マウスモノクローナル抗体4種の抗体のうちCTHRC1タンパク質に対して親和性が最も高い抗体を選択するために、間接(indirect)ELISAを行った。
4種のanti-CTHRC1マウス抗体のうち親和性が高い4H5及び9E6のエピトープを確認するために、競合(Competitive)ELISAを行った。ここで、エピトープとは、抗体が認識する抗原の位置を意味する。
CTHRC1に特異的であり、高い親和性を有する4H5及び9E6マウス抗体の免疫原性を最小限に抑えるために、マウス抗体の可変領域は維持し、定常領域のみヒト由来のタンパク質に置換したキメラ抗体を作製した。これらをcCMAb45及びcCMAb96と命名した。
実施例1-3で作製した抗CTHRC1キメラ抗体であるcCMAb45及びcCMAb96のCTHRC1タンパク質に対する親和性を検証した。抗原と抗体の親和性テストのために、間接ELISAを行った。
cCMAb45及びcCMAb96がCTHRC1に特異的に結合するか否かを確認するために、間接ELISAを行った。親和性の分析と同様に、免疫プレートにCTHRC1タンパク質と複数の不特定抗原タンパク質をコーティングした。その翌日、コーティング溶液を捨ててブロッキングし、その後cCMAb45及びcCMAb96を0、1、5μg/mlの濃度で入れて2時間反応させた。その後、抗体を含む溶液を捨て、次いで結合していない抗体を排除するために、洗浄過程を行った。二次抗体として抗ヒトκ軽鎖-HRP(kappa light chain-HRP)を用いて、O.D値を測定した。
cCMAb45及びcCMAb96の治療効能を検証するために、膵臓癌、乳癌、卵巣癌、膀胱癌の細胞株を用いて遊走抑制効果を確認した。
実施例1-7と同様に、cCMAb45及びcCMAb96の効能検証のために、癌細胞浸潤抑制効果を確認した。それを膵臓癌、患者由来膵臓癌細胞株、乳癌、卵巣癌、膀胱癌において行った。
実施例2-1:ヒト化抗体ライブラリーの構築
Anti-CTHRC1 chimeric抗体であるcCMAb45及びcCMAb96の免疫原性を低下させるために、抗原との結合に最も重要な部分であるCDR領域を除いて、CDR領域を支えるフレームワーク領域(Framework region, 以下、「FR」という)をヒトのものに交換したヒト化抗体を作製した。
作製したヒト化抗体ライブラリーから、CTHRC1に特異的であり、高い親和性を有するクローンを選択した。IgG臨時発現テストをHEK293F細胞において行い、4H5及び9E6に対する8種の抗体をそれぞれ精製し、SDS-PAGEにより純度を確認した。
実施例2-2で生産した4H5の8個の候補クローンの親和性の分析のために、間接ELISAを行った。免疫プレートにCTHRC1-Hisをコーティングし、その翌日、8個のヒト化候補抗体とcCMAb45の濃度を最高500ng/mlから1/3ずつ段階希釈して入れた。二次抗体として抗ヒトFc-HRPを用いて、O.D値を測定した。親和性をKD値で示した。KD値が低ければ低いほど、高い親和性を有することを意味する。
4H5及び9E6ヒト化抗体候補クローンの効能をテストするために、膵臓癌細胞株であるPanc-1を用いて、遊走分析を行った。各抗体5μg/mlと5×104個の細胞を無血清培地で希釈し、transwellの上部チャンバに分注した。次に、血清を含む培地を下部チャンバに設け、細胞が遊走できる環境を造成した。24時間培養し、その後遊走した細胞の数を測定して候補抗体の効能を評価した。
4H5及び9E6ヒト化抗体候補クローンを親和性、効能及び収率の3つの項目で評価し、抗体を選択した。4H5ヒト化抗体においてはSA2759、SA2761、SA2762を選択し、9E6ヒト化抗体においてはSA2768、SA2769、SA2770を選択した。
hCMAb45及びhCMAb96がCTHRC1に特異的に結合するか否かを確認するために、間接ELISAを行った。免疫プレートにCTHRC1-Hisと複数の不特定抗原をコーティングした。その翌日、hCMAb45及びhCMAb96を0、1、5μg/mlの濃度で抗原と反応させ、その後二次抗体として抗ヒトκ軽鎖-HRPを用いて、O.D値を測定した。
hCMAb45及びhCMAb96の治療効能の検証のために、癌細胞の遊走抑制効果を確認した。膵臓癌、乳癌、卵巣癌、膀胱癌、肺癌、悪性黒色腫を用いた。実験方法は、実施例1-7と同様である。
実施例1-8の実験方法と同様に、hCMAb45及びhCMAb96の癌細胞浸潤抑制効果を確認した。
実施例2-7、2-8により、CTHRC1タンパク質に特異的に結合するヒト化抗体hCMAb45及びhCMAb96の癌細胞遊走及び浸潤抑制能を試験管内(in vitro)で確認した。よって、生体内でも同様の抗癌効果を発揮するか否かを確認した。具体的には、CTHRC1が過剰発現する膵臓癌細胞株BxPC-3を用いて、subcutaneous xenograftマウスモデルを作製した。1×106個の細胞をマウスの右脚皮下に移植し、6日後に形成された腫瘍の大きさが73~77mm3のマウスを選択してグループに分けた。薬物は尾静脈に注入した。対照群IgGグループと実験群hCMAb45及びhCMAb96は、10mg/kgの用量で1週間に2回ずつ計4週間投与し、腫瘍の大きさは、カリパスを用いて1週間に2回測定した。抗体での処理を開始して28日目(8回処理)に実験を終了し、対照群IgGの腫瘍大きさと比較した。
4H5及び9E6ヒト化抗体候補クローンを親和性、効能及び収率の3つの項目で評価し、抗体を選択した。4H5ヒト化抗体においてはSA2759、SA2761、SA2762、SA2765を選択し、9E6ヒト化抗体においてはSA2768、SA2769、SA2770を選択した。
Claims (18)
- (a)配列番号1又は11の重鎖CDR1、配列番号2又は12の重鎖CDR2、及び配列番号3又は13の重鎖CDR3を含む重鎖可変領域と、
(b)配列番号4又は14の軽鎖CDR1、配列番号5又は15の軽鎖CDR2、及び配列番号6又は16の軽鎖CDR3を含む軽鎖可変領域とを含む、
CTHRC1(Collagen triple helix repeat containing-1)タンパク質に特異的に結合する抗体。 - 前記抗体は、
配列番号1の重鎖CDR1、配列番号2の重鎖CDR2、及び配列番号3の重鎖CDR3を含む重鎖可変領域と、
配列番号4の軽鎖CDR1、配列番号5の軽鎖CDR2、及び配列番号6の軽鎖CDR3を含む軽鎖可変領域とを含む、
請求項1に記載の抗体。 - 前記抗体は、
配列番号11の重鎖CDR1、配列番号12の重鎖CDR2、及び配列番号13の重鎖CDR3を含む重鎖可変領域と、
配列番号14の軽鎖CDR1、配列番号15の軽鎖CDR2、及び配列番号16の軽鎖CDR3を含む軽鎖可変領域とを含む、
請求項1に記載の抗体。 - 前記重鎖可変領域は、配列番号7、17、21又は25のアミノ酸配列からなり、前記軽鎖可変領域は、配列番号9、19、23又は27のアミノ酸配列からなる、請求項1に記載の抗体。
- 請求項1~4のいずれか一項に記載の抗体をコードするポリヌクレオチド。
- 請求項5に記載のポリヌクレオチドを含む発現ベクター。
- 請求項6に記載の発現ベクターを含む宿主細胞。
- 請求項1~4のいずれか一項に記載の抗体を含む、癌の予防又は治療用薬学的組成物。
- 前記癌は、膵臓癌、卵巣癌、乳癌、黒色腫、肝癌、胃癌、肺癌、大腸癌、口腔癌、子宮頸癌及び膀胱癌からなる群から選択される、請求項8に記載の組成物。
- 請求項1~4のいずれか一項に記載の抗体を用いて、癌の疑いのある個体の分離された生物学的試料のCTHRC1タンパク質を抗原抗体反応により検出するステップを含む、癌の診断のための情報の提供方法。
- 請求項1~4のいずれか一項に記載の抗体を用いて、癌を発症している個体の分離された生物学的試料のCTHRC1タンパク質を抗原抗体反応により検出するステップを含む、癌の予後予測のための情報の提供方法。
- 請求項1~4のいずれか一項に記載の抗体を含む、癌診断又は予後予測用組成物。
- 請求項12に記載の組成物を含む、癌診断又は予後予測用キット。
- 請求項1~4のいずれか一項に記載の抗体を含むCTHRC1検出用キット。
- 前記キットはELISAの形態である、請求項14に記載のキット。
- 前記抗体は捕獲抗体である、請求項15に記載のキット。
- 前記ELISAは、
(i)CTHRC1に結合するポリクローナル抗体と、
(ii)請求項1~4のいずれか一項に記載の抗体の形態である捕獲抗体と、
(iii)検出標識が結合されたIgG Fcに結合された抗体とを含む、
間接ELISAである、請求項15に記載のキット。 - 請求項1~4のいずれか一項に記載の抗体を用いて、CTHRC1抗原抗体複合体を検出するステップを含む、試料内のCTHRC1タンパク質を検出する方法。
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