JP7143452B2 - CD47とSIRPaの相互作用を遮断できる抗体及びその応用 - Google Patents
CD47とSIRPaの相互作用を遮断できる抗体及びその応用 Download PDFInfo
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Description
本発明において、特に断りのない限り、本明細書で使用される科学用語及び技術用語は、当業者が一般的に理解する意味を有する。また、本明細書において使用されるタンパク質及び核酸化学、分子生物学、細胞及び組織培養、微生物学、免疫学の関連用語および実験室の操作ステップは、いずれも対応する分野で広く使用されている用語および一般的なステップである。また、本発明をよりよく理解するために、以下、関連する用語の定義及び解釈を提供する。
ヒトCD47のcDNAプラスミド(Sino Biological,品番:HG12283-G)をテンプレートとし、ヒトCD47分子のN末端の細胞外領域断片(19-135)をPCRで増幅し、ここでCys33はGlyに突然変異し、PCRプライマーは以下のとおりである:
上流プライマー5’CTGAGAGGTGCCAGATGTCAGCTACTATTTAATAAAACAAAATCTGTAGAATTCACGTTTGGTAATGACACTGTCGT3’
下流プライマー5’TCCGCCTCCGCCGCTAGCTGAAACAACACGATA3’
ヒトCD47全長配列を含有するレンチウイルスベクターを構築し、レンチウイルスパッケージングキットの使用説明書(Lenti-Pac HIV Expression Packaging Kit,GeneCopoeia,品番:HPK-LvTR-20)に従って、構築されたレンチウイルスと包装プラスミドによりHEK293T細胞をコトランスフェクトし、レンチウイルスのパッケージングを行った。48時間トランスフェクトした後に、培地を収集し、500*gで10分間遠心分離して細胞の破片を除去し、レンチウイルスを含有する培養上清を得て、0.45μmのPES濾過膜で濾過した後、1.5mlのEP管(管あたり200μl)に分注し、10μlの上清を用いて1x106個のCHO細胞を感染させ、残りの上清を-80℃で保存した。感染後、培地に10μg/mlのpuromycinを加えてスクリーニングし、陽性クローンの限界希釈後、ヒト全長CD47分子を安定して発現させる細胞株hCD47-CHO-1B10を得た。結果を図3に示す。
ヒトCD47組換えタンパク質又はhCD47-CHO-1B10細胞を抗原として等量の免疫アジュバント(フロイントアジュバント)と混合し、群ごとに6匹の6~8週齢の雌性Balb/cマウスを免疫した。初回免疫の2週間後、追加免役を行った。3回の免疫後、眼窩から採血して血清の力価を検出した。融合する前に、1x106個のhCD47-CHO安定形質転換細胞をショック免疫のために尾静脈注射した。3日後、頸椎脱臼によってマウスを殺し、マウスの脾臓と一部の末梢リンパ節をDMEM培地で粉砕して遠心分離し、上清を捨て、脾臓細胞塊を軽く崩し、5mlの赤血球溶解液を加え、50s溶解した後、DMEMを40ml加えて遠心分離し、赤血球を含まない脾臓細胞懸濁液を得た。適量のリンパ節及び脾臓細胞の懸濁液とSP2/0を混合して、BTXエレクトロフュージョン装置を用いて細胞融合を行った。融合細胞を96ウェルプレートに播種し、HATを含むDMEM完全培地中に、5%CO 2 、37℃の条件下で培養した。約1週間でハイブリドーマ細胞の増殖状況を観察し、60%以上に増殖したとき、抗体検査のために上清を取り出した。
0.05Mの重炭酸塩緩衝液(pH9.0)を用いて1μg/mlのhCD47抗原(hCD47R-ECDchis)を調製し、96ウェルマイクロタイタープレート(Costar,品番:9018)にウェルあたり100μl加え、4℃で一晩インキュベートした。翌日PBSで3回洗浄し、200μlの2%脱脂粉乳/PBSで室温で2時間ブロッキングし、PBSで3回洗浄し、ハイブリドーマ上清を50μl加え、室温で1時間インキュベートした後に、PBSTとPBSで3回洗浄した。第2の抗体(抗mouse IgG-Fc-HRP,Jackson Immuno Research,品番:115-035-071)を加えて1時間インキュベートし、3回繰り返して洗浄し、発色液(TMB溶液、Sigma,品番:T2885)を50μl加えて37℃で5分間放置した後に、2M濃硫酸溶液を50μl加えて反応を終了させ、直ちにマイクロプレートリーダーに入れてOD450値を読み取った。
CCRF-CEM細胞を5×104個/ウェルで96ウェルプレートに加え、各ウェルにハイブリドーマ上清を50μl加え、4℃で30分間インキュベートした。1μg/mlのビオチン化SIRPα-Fc融合タンパク質を50μl加え、4℃で30分間インキュベートし、0.5%BSA/PBSで洗浄した後、第2の抗体溶液(SA-PE,Jackson Immuno Research,品番:016-110-084)を50μl加えた。最後に、1μg/mlの蛍光色素(ヨウ化プロピジウム,PI,Sigma,品番:P4170)を含有するPBS溶液60μlを用いて細胞を再懸濁させ、フローサイトメーターで検出した。結果を図5に示す。ハイブリドーマ陽性クローン1H1、2E4、7A11、7G5、7H5、9C4、9G11、10B8、12G8、14G6、15A7及び15G6は、CD47陽性細胞の表面に結合すると、SIRPαとCD47の結合を効果的に防ぐことができる。
前期スクリーニングの結果から、ハイブリドーマ細胞のRNAを抽出し、cDNAに逆転写した。cDNAをテンプレートとしてPCR増幅を行い、配列を決定して、以下の候補陽性クローンの重鎖及び軽鎖の可変領域配列を得た。
重鎖
核酸配列
CAGATCCAGCTGCAGCAGTCTGGACCTGAGGTGGTGAAGCCTGGGGCTTCAGTGAAGATATCCTGCAAGGCTTCTGGCTACACCTTCACTGACGACTATATAAACTGGGTGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATGCTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGATTGTAGACACATCCTCCACCACAGCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTTCAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACTTTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTCGGAGAGAAAGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAATTACTTGGCCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGCCTGAAGACCTGGCAGTTTATTACTGTCAGCAATTTTATAGGTACCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン7A11-C2:
重鎖
核酸配列
CAGATCCAGCTGCAGCAGTCTGGACCTGAGCTGGTGAAGCCTGGGGCTTCAGTGAAGATATCCTGCAAGGCTTCTGGCTACACCTTCACTGACTACTATCTACACTGGGTGAAGCAGAGGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACAGCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTGCAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGACCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATATTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン7G5-D10:
重鎖
核酸配列
CAGGTCCAACTGCAGCAGCCTGGACCTGAGCTGGTGAAGCCTGGGACTTCAGTGAAGATATCCTGCAAGGCTTCTGGCTACACCTTCACTGACTACTATATAAACTGGGTGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACAGCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTGCAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTGCTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGACCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCTTCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAACAATATTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン7H5-B12:
重鎖
核酸配列
CAGGTCCAACTGCAGCAGCCTGGGGCTGAGCTGGTGAAGCCTGGGGCCTCAGTGAAGATGTCCTGCAAGGCTTCTGGCTACACATTTACCAATTACAATTTTCACTGGGTAAAGCAGACACCTGGACAGGGCCTGGAATGGATTGGAACATTTTATCCAGTAAATGGTGATACTTCCTACAATCAGAAGTTCGATGGCAAGGCCACAGTGACTGCAGACAAATCCTCCAGCACAGCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACTCTGCGGTCTATTACTGTGCAAGAGGGGGTACGAGGGCTATGGACTACTGGGGTCAAGGGACCTCAGTCACCGTCTCCTCA
軽鎖
核酸配列
GATGTTTTGATGACCCAAACTCCACTCTCCCTGCCTGTCAGTCTTGGAGATCAAGCCTCCATCTCTTGCAGATCTAGTCAGGGCATTGTACATAGTAATGGAAACACCTATTTAGCATGGTACCTGCAGAAACCAGGCCAGTCTCCAAAACTCCTGATCTACAAAGTTTCCAACCGATTTTCTGGGGTCCCAGACAGGTTCAGTGGCAGTGGATCAGGGACAGATTTCACACTCAAGATCAGCAGAGTGGAGGCTGAGGATCTGGGAGTTTATTACTGCTTTCAAGGTTCACATGTTCCGTACACGTTCGGAGGGGGGACCAAGCTGGAAATAAAA
クローン9G11-D2:
重鎖
核酸配列
CAGATCCTGCTGCAGCAGTCTGGACCTGACCTGGTGAAGCCTGGGGCTTCAGTGAAGATTTCCTGCAAGGCTTCTGGATACACCTTCACTGACTACTATATACACTGGGTGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAATTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACACCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTACAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGGCCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATTTTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン10B8-B8:
重鎖
核酸配列
CAGATCCAGCTGCAGCAGTCTGGACCTGACCTGGTGAAGCCTGGGGCTTCAGTGAAGATTTCCTGCAAGGCTTCTGGATACACCTTCACTGACTACTATATACACTGGATGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACACCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTGCAAGAAGGAGGGAAGATTCCTTTGACTACTGGGGCCAAGTCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGCAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGGCCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAATTGTTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAGGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATTTTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン12G8-A9:
重鎖
核酸配列
CAGATCCAGCTGCAGCAGTCTGGACCTGAGCTGGTGAAGCCTGGGGCTTCAGTGAAGATATCCTGCAAGGCTTCTGGCTACATCTTCACTGACTACTATATACACTGGGTGAAGCAGAGGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACAGCCTACATGCAGCTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTGCAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCATGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGACCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATCACTGTCAGCAATATTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン14G6-C1:
重鎖
核酸配列
CAAATCCAGCTACAGCAGTCTGGACCTGAGCTGGTGAAGACTGGGGCTTCAGTGAGGATATCCTGCAAGGCTTCTGGCTTCACCTTCACTGACTCCTATATAAACTGGGTGAAGCAGAGGCCTGGACAGGGACTTCAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGACAAGGCCACATTGACTGTAGACACATCTTCCAGCACAGCCTACATGCAGCTCAACAGCCTGACATCTGAGGACACTGCTGTCTTTTTCTGTACAAGAAGGAGGGAGGATTCTTTTGACTATTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGACCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCATTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATATTATAGCTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン15G6-E8:
重鎖
核酸配列
CAGATCCAGCTGCAGCAGTCTGGACCTGAGCTGGTGAAGCCTGGGGCTTCAGTGAAGATATCCTGCAAGGCTTCTGGCTACACCTTCACTGACTACTATATACACTGGGTGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGCGGTAATACTAAGTACAATGAGAAGTTCAAGGGCAAGGCCACATTGACTGTAGACACATCCTCCAGCACAGTCTACATGCAGCCCAGCAGCCTGACATCTGAGGACATTGCTGTCTATTTCTGTGCAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAACTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTATTTGGCCTGGTACCAGCGGAAGCCAGGGCAGTCTCCTAAACTGTTGATTTACTGGGCATCCAATAGGGAATCTGGGGTCCCCGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATTTTATAGGTATCCGCTCACGTTCGGTGCTGGGACCAAGCTGGAGCTGAAA
クローン15A7-A10:
重鎖
核酸配列
CAGATCCTGCTGCAGCAGTCTGGACCTGACCTGGTGAAGCCTGGGGCTTCAGTGAAGATTTCCTGCAAGGCTTCGGGATACACCTTCACTGACAACTATATACACTGGGTGAAGCAGAAGCCTGGACAGGGACTTGAGTGGATTGGATGGATTTATCCTGGAAGTGGTAATGCTAAGTACAATGAGAAATTCAAGGGCAAGGCCACATTGACTGTAGACAGATCCTCCAGCACACCCTACATGCAACTCAGCAGCCTGACATCTGAGGACACTGCTGTCTATTTCTGTACAAGAAGGAGGGAGGATTCCTTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCCTCA
軽鎖
核酸配列
GACATTGTGATGTCACAGTCTCCATCCTCCCTAGCTGTGTCAGTTGGAGAGAAGGTTACTATGAGCTGCAAGTCCAGTCAGAGCCTTTTATATAGTAGCAATCAAAAGAACTACTTGGCCTGGTACCAGCAGAAACCAGGGCAGTCTCCTAAACTGCTGATTTACTGGGCATCCACTAGGGAATCTGGGGTCCCTGATCGCTTCACAGGCAGTGGATCTGGGACAGATTTCACTCTCACCATCAGCAGTGTGAAGGCTGAAGACCTGGCAGTTTATTACTGTCAGCAATTTTATAGGTATCCGCTCACGTTCGGCGCTGGGACCAAGCTGGAGCTGAAA
重鎖及び軽鎖の可変領域配列断片を増幅し、GibsonAssemblyを介して、完全な抗体の重鎖及び軽鎖を発現させる対応するプラスミドベクターに挿入し、ここで、ヒト重鎖定常領域を含むベクターに重鎖可変領域をクローニングすることにより、哺乳動物細胞に完全なIgG1重鎖を発現させることができる。同様に、ヒト軽鎖定常領域を含むベクターに軽鎖可変領域をクローニングすることにより、哺乳動物細胞に完全なIgGkappa軽鎖を発現させることができる。配列が正しかったプラスミドは、哺乳動物細胞HEK293.6EにCD47候補抗体を瞬時に発現させ、5~7日後に細胞上清を収集し、濾過して精製した。ProteinAクロマトグラフィーを用いてIgGを精製し、50mMのTris-HCl(pH8.0)と250mMのNaClで洗浄し、結合したIgGを0.1MのGlycine-HCl(pH3.0)で溶出した。濃縮管(Millipore)を用いてタンパク質を限外濾過により濃縮し、PBSに液交換し、IgGの濃度を測定した。
組換えで発現されるキメラ抗体に対して、ELISA及びFACSによりそれぞれ抗原と細胞レベルでヒトCD47分子結合及びCD47-SIRPα遮断実験を行った。
0.05Mの重炭酸塩緩衝液(pH9.0)を用いて1μg/mlのhCD47抗原を調製し、96ウェルマイクロタイタープレートにウェルあたり100μl加え、4℃で一晩インキュベートした。翌日PBSで3回洗浄し、200μlの2%脱脂粉乳/PBSを用いて室温で2時間ブロッキングし、PBSで3回洗浄し、等比希釈された抗体を50μl加え、室温で1時間インキュベートした後に、PBSTとPBSで3回洗浄した。第2の抗体抗mouse IgG-Fc-HRPを加えて1時間インキュベートし、3回繰り返し洗浄して、発色液(TMB溶液,Sigma,品番:T2885)を50μl加え、37℃で5分間放置した後、直ちに2Mの濃硫酸溶液を50μl加えて反応を終了させ、直ちにマイクロプレートリーダーに入れてOD450値を読み取った(図6-1)。
1μg/mlの組換えタンパク質hCD47を一晩被覆し、翌日PBSで3回洗浄して、2%脱脂粉乳/PBS200μlを用いて室温で2時間ブロッキングし、PBSで3回洗浄し、先に等比希釈された異なる濃度のCD47キメラ抗体を50μl加えた。次にビオチン化SIRPα-Fc融合タンパク質を50μl加え、それぞれ室温で1時間インキュベートした後にPBSTとPBSで3回繰り返し洗浄して、第2の抗体(SA-HRP,Jackson Immuno Research,品番:016-030-084)を加え、1時間インキュベートした。3回繰り返し洗浄して、発色液を50μl加え、37℃で5分間放置した後、直ちに2Mの濃硫酸溶液を50μl加えて反応を終了させ、直ちにマイクロプレートリーダーに入れてOD450値を読み取った(図6-2)。
hCD47を発現させる腫瘍細胞CCRF-CEMを選択し、96ウェルU底プレートにウェルあたり5×104個の細胞を播き、等比希釈された異なる濃度のCD47キメラ抗体を50μl加えた。4℃で60分間インキュベートした後に、0.5%BSA/PBSで余分な第1の抗体を洗い流し、次に第2の抗体抗mouse IgGFc-AF647溶液を50μl加えた。4℃で45分間インキュベートした後に、0.5%BSA/PBSで余分な第2の抗体を洗い流し、最後に1μg/mlの蛍光色素PIを含有するPBS溶液60μlを用いて細胞を再懸濁させ、直ちにフローサイトメーターにより検出した(図6-3)。
CCRF-CEMを96ウェルU底プレートにウェルあたり5×104個の細胞を播き、等比希釈された異なる濃度のCD47キメラ抗体を50μl加え、4℃で30分間インキュベートした後に、1μg/mlのビオチン化SIRPα-Fc融合タンパク質溶液を50μl加え、4℃で30分間インキュベートした後に、0.5%BSA/PBSで余分な第1の抗体を洗い流し、次に第2の抗体SA-PE溶液を50μl加え、最後に1μg/mlの蛍光色素PIを含有するPBS溶液60μlを用いて細胞を再懸濁させ、直ちにフローサイトメーターにより検出した(図6-4)。実験結果は、構築されたヒト-マウスキメラ抗体が抗原と細胞の両方のCD47に結合できるとともに、CD47-SIRPα受容体及びリガンドの結合を競合的に阻害する生物学的活性を有することを示している。
新鮮なサルの血液を4ml収集して50mlの遠心管に入れ、赤血球溶解液を10ml加え、室温で10分間静置し、1200rpmで10分間遠心分離した。PBSを20ml加えて2回洗浄し、2回目の洗浄前に細胞を数え、2x105個の細胞/管で細胞の染色を準備した。1200rpmで10分間遠心分離し、100μg/mlのマウスIgGで5~10分間ブロッキングし、異なる濃度の抗体を加え、氷上で60分間インキュベートした。2回洗浄して余分な第1の抗体を洗い流し、第2の抗体(抗human IgGFc-AF647,Jackson Immuno Research,品番:109-606-170)を加え、氷上で45分間インキュベートし、2回洗浄して余分な第2の抗体を洗い流し、最後に1μg/mlのPI/PBSで細胞を再懸濁させ、フローサイトメーターにより検出した。結果を図7に示す。
Ficoll(GE healtheare,品番:17-1440-03)を用いて新鮮なヒト血液からPBMC細胞を分離し、ヒトの洗浄されたPBMC細胞の上清を捨て、MACS Bufferを用いて細胞(1x107個の細胞/80μL)を再懸濁させ、CD14 MicroBeads human-lyophilized(10^7個の細胞/20μL)(MACS,品番:130097052)を加え、選別磁気スタンドにより非単核細胞を溶出してから、最後にMACS Bufferで単核細胞を溶出し、RPMI1640培地(40ng/mlのCSF-1を含有する)で培養して誘導しマクロファージとした。
被験抗体をPBS溶液で倍加希釈して、濃度を10μg/mlとし、96ウェルプレートに異なる希釈倍率の抗体を50μl加え、更に密度が1x108個/mlの新鮮な赤血球を50μl加え、室温で数分間静置した後、肉眼で見える凝集粒子が一部の反応ウェルに現れた。顕著な凝集現象が現れていない反応ウェルを2時間放置した後、顕微鏡で赤血球の凝集があるかどうかを確認した。結果を図9に示す。
マウスモノクローナル抗体15G6のヒト化は、典型的なCDR移植ポリシーを参照して行った。すなわち、マウス抗15G6の軽、重鎖可変領域CDR配列を、相同性の高いヒト生殖系配列IGKV4-1*01とIGHV1-3*01に移植し、フレームワーク領域4は、マウス抗体との相同性が最も高いIGKJ1*01とIGHJ4*01を選択し、その後、同時にコンピュータを用いて相同性モデリングを行い、逆突然変異部位を設計した。
核酸配列
CAGATTCAGCTGGTGCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACAAGCAGCAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGATACCGCCGTGTACTTCTGTGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v2:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v3:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCATGACCGTGGACACCAGCATCAGCACCGCCTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v4:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCATGACCAGAGACACCAGCATCAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v5:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCATGACCAGAGACACCAGCATCAGCACCGCCTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v6:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCcctGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v7:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAActgAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v8:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACATTGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v9:
核酸配列
CAGGTTCAGCTGGTTCAGTCTGGCGCCGAAGTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACAACTGTCACCGTTAGCTCT
VH-v10:
核酸配列
CAGGTTCAGCTGGTGCAGTCTGGACCCGAGCTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACCAGCACAAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGACACCGCCGTGTACTACTGCGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
VH-v11:
核酸配列
CAGATTCAGCTGGTGCAGTCTGGCGCCGAACTGAAGAAACCTGGCGCCTCTGTGAAGGTGTCCTGCAAGGCTAGCGGCTACACATTCACCGACTACTACATCCACTGGGTCCGACAGGCCCCTGGACAGGGACTTGAATGGATGGGCTGGATCTACCCTGGCAGCGGCAACACCAAGTACAACGAGAAGTTCCAGGGCAGAGTGACCCTGACCGTGGACACAAGCAGCAGCACCGTGTACATGGAACTGAGCAGCCTGAGAAGCGACGATACCGCCGTGTACTTCTGTGCCAGAAGAAGAGAGGACAGCTTCGACTACTGGGGCCAGGGAACACTGGTCACCGTTAGCTCT
Vk-v1:
核酸配列
GACATCGTGATGACACAGAGCCCTGATAGCCTGGCCGTGTCTCTGGGAGAGAGAGCCACCATCAACTGCAAGAGCAGCCAGAGCCTGCTGTACTCCAGCAACCAGAAGAACTACCTGGCCTGGTATCAGAGAAAGCCCGGCCAGCCTCCTAAGCTGCTGATCTACTGGGCCAGCAACAGAGAATCCGGCGTGCCCGATAGATTCAGCGGCTCTGGATCTGGCACCGACTTCACCCTGACAATCAGCTCCCTGCAGGCCGAGGATGTGGCCGTGTACTACTGCCAGCAGTTCTACAGATACCCTCTGACCTTCGGCCAGGGCACCAAGGTGGAAATCAAG
Vk-v2:
核酸配列
GACATCGTGATGACACAGAGCCCTGATAGCCTGGCCGTGTCTCTGGGAGAGAGAGCCACCATCAACTGCAAGAGCAGCCAGAGCCTGCTGTACTCCAGCAACCAGAAGAACTACCTGGCCTGGTATCAGCAGAAGCCCGGCCAGCCTCCTAAGCTGCTGATCTACTGGGCCAGCAACAGAGAAAGCGGCGTGCCCGATAGATTCAGCGGCTCTGGATCTGGCACCGACTTCACCCTGACAATCAGCTCCCTGCAGGCCGAGGATGTGGCCGTGTACTACTGCCAGCAGTTCTACAGATACCCTCTGACCTTCGGCCAGGGCACCAAGGTGGAAATCAAG
Vk-v3:
核酸配列
GACATCGTGATGACACAGAGCCCTGATAGCCTGactGTGTCTCTGGGAGAGAGAGCCACCATCAACTGCAAGAGCAGCCAGAGCCTGCTGTACTCCAGCAACCAGAAGAACTACCTGGCCTGGTATCAGCAGAAGCCCGGCCAGCCTCCTAAGCTGCTGATCTACTGGGCCAGCAACAGAGAAAGCGGCGTGCCCGATAGATTCAGCGGCTCTGGATCTGGCACCGACTTCACCCTGACAATCAGCTCCCTGCAGGCCGAGGATGTGGCCGTGTACTACTGCCAGCAGTTCTACAGATACCCTCTGACCTTCGGCCAGGGCACCAAGGTGGAAATCAAG
Vk-v4:
核酸配列
GACATCGTGATGACACAGAGCCCTGATAGCCTGGCCGTGTCTCTGGGAGAGAGAGCCACCATCAACTGCAAGAGCAGCCAGAGCCTGCTGTACTCCAGCAACCAGAAGAACTACCTGGCCTGGTATCAGCAGAAGCCCGGCCAGCCTCCTAAGCTGCTGATCTACTGGGCCAGCAACAGAGAAAGCGGCGTGCCCGATAGATTCAGCGGCTCTGGATCTGGCACCGACTTCACCCTGACAATCAGCTCCCTGCAGGCCGAGGATGTGGCCGTGTACTACTGCCAGCAGTTCTACAGATACCCTCTGACCTTCGGCCAGGGCACCAAGCTGGAAATCAAG
Vk-v5:
核酸配列
GACATCGTGATGACACAGAGCCCTGATAGCCTGGCCGTGTCTCTGGGAGAGAGAGCCACCATCAACTGCAAGAGCAGCCAGAGCCTGCTGTACTCCAGCAACCAGAAGAACTACCTGGCCTGGTATCAGCAGAAGCCCGGCCAGCCTCCTAAGCTGCTGATCTACTGGGCCAGCAACAGAGAAAGCGGCGTGCCCGATAGATTCAGCGGCTCTGGATCTGGCACCGACTTCACCCTGACAATCAGCTCCCTGCAGGCCGAGGATGTGGCCGTGTACTACTGCCAGCAGTTCTACAGATACCCTCTGACCTTCGGCCAGGGCACCAAGGTGGAACTGAAG
全ての重鎖と軽鎖を真核発現ベクターに構築し、全ての重鎖と軽鎖を互いにペアリングし、瞬時に発現した抗体を用いて親和性検出、受容体リガンド遮断実験を行った結果、ヒト化した抗体のCD47に対する親和性と受容体リガンドに対する遮断能は顕著に変化していないことが示された。さらに赤血球凝集試験を行った結果、図10に示すとおり、凝血現象が現れなかった。
Fortbio、ELISA及びFACSにより抗CD47モノクローナル抗体とヒトCD47分子の親和性を測定した。
ProteinAプローブをそれぞれ5μg/mlの被検抗体で被覆し、組換えタンパク質hCD47を段階希釈し、5μg/ml、2.5μg/ml、1.25μg/ml、0.625μg/ml、0μg/mlの5つの濃度に設定して、Fortbio機器により試料検出を行った。結果を図11に示す。
Ficoll(GE healtheare,品番:17-1440-03)を用いて新鮮なヒト血液からPBMC細胞を分離し、ヒトの洗浄されたPBMC細胞の上清を捨て、MACS Bufferを用いて細胞(10^7個の細胞/80μL)を再懸濁させ、CD14 MicroBeads human-lyophilized(10^7個の細胞/20μL)(MACS,品番:130097052)を加え、選別磁気スタンドにより非単核細胞を溶出してから、最後にMACS Bufferで単核細胞を溶出し、RPMI1640培地(40ng/mlのCSF-1を含有する)で培養して誘導し、マクロファージとした。
1μMのCFSEで標識されたDaudi細胞を、CD47+標的細胞として使用し、1×105個/ウェルで96ウェルプレートに50μl接種し、次に最終濃度の4倍に希釈したヒト化h15G6-IgG4抗体を50μl加えた。そして密度が2.5×105個/mlであり、CSF-1で7日間誘導して成熟したマクロファージを100μl加え、マクロファージ:Daudi=1:4とした。37℃のインキュベーターで4時間インキュベートし、最後にフローサイトメーターにより収集された細胞を検出した。結果を図14に示す。
抗体依存性細胞によって媒介される細胞毒性作用(ADCC)
適量のエフェクター細胞(NK-92MI-CD16)を用意し、2.5%FBSを含有するRPMI1640培地を用いて細胞を密度4×106個/mlに再懸濁させ、同様に、標的細胞(CCRF-CEM)を密度4×105個/mlに再懸濁させた。抗体の初期濃度を40μg/mlに設定し、次に10倍等比希釈した。エフェクター細胞50μl(2×105個/ウェル)を96ウェルU底プレートに入れ、異なる希釈比率の抗体を25μl加え、37℃、5%CO 2 のインキュベーターで30分間インキュベートした。インキュベート完了後、標的細胞を25μl(1×104個/ウェル)加え、1000rpmで1分間遠心分離し、37℃、5%CO 2 のインキュベーターで4hインキュベートした。検出の30分前に、ウェルの最も大きい標的細胞に溶解液(10×)を2μl加え、そのまま培養し続けた。30分後に、1000rpmで3分間遠心分離し、細胞上清50μlを黒色のマイクロタイタープレートに入れ、等量のLDHを用いて基質(CytoTox-ONE Homogeneous Membrane Integrity Assay,Promega,品番:G7892)を検出し、軽く振とうして均一に混合した。10分後に、25μlの停止溶液で停止し、10s振とうし、excitation560nm、emission590nmのFluorescence波長を選択して、化学発光を検出した。結果を図15に示す。
標的細胞(CCRF-CEM)を密度2×106個/mlに再懸濁させた。抗体の初期濃度を30μg/mlに設定し、RPMI1640培地で抗体を1:3で等比希釈した。RPMI1640培地で30%補体を調製した。細胞懸濁液50μl(1×105個/ウェル)を96ウェルプレートに入れ、異なる希釈濃度の抗体を50μl加え、次に30%に希釈した補体を50μl加え、37℃、5%CO 2 のインキュベーターで2時間インキュベートした。RPMI培地(0.1%BSAを含有する)で40%CCK8を含有する検出溶液を調製し、細胞-抗体-補体を2時間インキュベートした後、各ウェルにCCK8溶液を50μl加えて染色し、10秒間振とうし、37℃、5%CO 2 のインキュベーターで4時間インキュベートした。インキュベート完了後、10秒間振とうし、マイクロプレートリーダーを使用して、450nmを検出波長とし、630nmを基準波長としてOD値を読み取った。結果を図16に示す。
CD47ヒト化マウスC57BL/6-Cd47tm1(hCD47)/Bcgen(バイオサイトジェン社,品番:B-CM-021)を用意し、抗体の腹腔内注射法(10mg/kg体重)を用いて2回投与し、群ごとに3匹の被験マウスを設定した。1回目の投与後2、6、9、13日目に被験マウスの血液を採取し、一般的血液検査を行い、7日目に2回目の投与を行い、9、13、18日目に被験マウスに一般的血液検査を行った。結果を図17に示す。
10%ウシ胎児血清を含有するRPMI1640培養液にRaji細胞を培養した。対数増殖期のRaji細胞を収集し、PBSで適切な濃度に再懸濁させ、NOD/SCIDマウス皮下腫瘍接種のためにmatrigelと1:1で混合した。雌マウスの右側に1×107個のRaji細胞を皮下接種し、腫瘍の平均体積が89.39mm3になったとき、腫瘍の大きさに応じてランダムに群分けした。群ごとに6匹のマウスを設定し、治療群のマウスに対して10mg/kgの用量で毎週2回尾静脈注射し、計2週間投与して、腫瘍体積をモニタリングした。腫瘍体積の計算方法は、腫瘍体積(mm3)=1/2×(a×b2)(ただしaは長径、bは短径)である。
10%ウシ胎児血清を含有するMcCoy’s5a培養液にSKOV-3細胞を培養した。対数増殖期のSK-OV-3細胞を収集し、PBSで適切な濃度に再懸濁させ、NPGマウス皮下腫瘍接種のためにmatrigelと1:1で混合した。雌マウスの右側に1×107個のSKOV-3細胞を皮下接種した。腫瘍の平均体積が93.76mm3になったとき、腫瘍の大きさに応じてランダムに群分けした。群ごとに6匹のマウスを設定し、治療群のマウスに対して10mg/kgの用量で毎週3回尾静脈注射し、計4週間投与して、腫瘍体積をモニタリングした。腫瘍体積の計算方法は、腫瘍体積(mm3)=1/2×(a×b2)(ただしaは長径、bは短径)である。
10%ウシ胎児血清を含有するRPMI1640培養液にHL-60細胞を培養した。対数増殖期のHL-60細胞を収集し、PBSで適切な濃度に再懸濁させ、NPGマウス皮下腫瘍接種のためにmatrigelと1:1で混合した。雌マウスの右側に1×107個のHL-60細胞を皮下接種した。腫瘍の平均体積が107.9mm3になったとき、腫瘍の大きさに応じてランダムに群分けした。群ごとに6匹のマウスを設定し、治療群のマウスに対して3mg/kg、10mg/kgの用量で2週間投与した。1週目は3回、2週目は2回投与して、腫瘍体積をモニタリングした。腫瘍体積の計算方法は、腫瘍体積(mm3)=1/2×(a×b2)(ただしaは長径、bは短径)である。
肺癌患者の腫瘍組織の異種移植担癌マウスモデルから腫瘍組織を取り、直径2~3mmの腫瘍塊に切り分け、NPGマウスの右前肩甲骨に皮下接種した。平均腫瘍体積が102.97mm3になったとき、腫瘍の大きさに応じてランダムに群分けした。群ごとに6匹のマウスを設定し、治療群のマウスに対して1mg/kg、3mg/kgの用量で毎週2回尾静脈注射し、計3週間投与して、腫瘍体積をモニタリングした。腫瘍体積の計算方法は、腫瘍体積(mm3)=1/2×(a×b2)(ただし、aは長径、bは短径)である。
本試験は、4匹のカニクイザル(雌雄半分ずつ)をランダムに2群に分け、それぞれ高用量群、低用量群とした。毎週1回投与し、計5回、すなわち、D1、D8、D15、D22及びD29にそれぞれ投与した。各群の動物の投与量と濃度は以下の表に示すとおりである。静脈注射により、投与量は10ml/kgであった。
カニクイザルの後肢の静脈から約1mlの血液を採取し、血液試料に抗凝血剤を加えず、採取後2h以内に血清を分離した。血中濃度検出は、ヒトCD47抗原を被覆するELISA法を用い、二次検出抗体をAnti-Human IgG(Fc specific)-Peroxidase antibody produced in goatとした。Winnonlinソフトウェアを使用して薬物動態パラメータを算出し、以下の表に示す。
Claims (15)
- 配列番号102のアミノ酸配列からなる重鎖CDR1、配列番号103のアミノ酸配列からなる重鎖CDR2、及びアミノ酸配列配列番号104からなる重鎖CDR3;並びに、
配列番号157のアミノ酸配列からなる軽鎖CDR1、配列番号158のアミノ酸配列からなる軽鎖CDR2、及び配列番号159のアミノ酸配列からなる軽鎖CDR3を含む、CD47に結合する抗体又はその機能的断片。 - (1)配列番号101のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(2)配列番号101のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
(3)配列番号106のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(4)配列番号106のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
(5)配列番号111のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(6)配列番号111のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
(7)配列番号116のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(8)配列番号116のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
(9)配列番号121のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(10)配列番号121のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
(11)配列番号131のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域;
(12)配列番号131のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;及び/又は、
(13)配列番号151のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域;
を含む、請求項1に記載の抗体又はその機能的断片。 - 配列番号101のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域を含む、請求項2に記載の抗体又はその機能的断片。
- 配列番号121のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域を含む、請求項2に記載の抗体又はその機能的断片。
- 配列番号131のアミノ酸配列からなる重鎖可変領域、及び、配列番号156のアミノ酸配列からなる軽鎖可変領域を含む、請求項2に記載の抗体又はその機能的断片。
- 配列番号131のアミノ酸配列からなる重鎖可変領域、及び、配列番号161のアミノ酸配列からなる軽鎖可変領域を含む、請求項2に記載の抗体又はその機能的断片。
- 前記抗体又はその機能的断片が、CD47とSIRPαの相互作用を遮断する、請求項1~6のいずれか一項に記載の抗体又はその機能的断片。
- 前記抗体又はその機能的断片が、顕著な血球凝集活性を有さない、請求項1~6のいずれか一項に記載の抗体又はその機能的断片。
- 前記抗体又はその機能的断片が、ヒト化されている、請求項1~6のいずれか一項に記載の抗体又はその機能的断片。
- 前記抗体又はその機能的断片が、IgG1型又はIgG4型である、請求項1~6のいずれか一項に記載の抗体又はその機能的断片。
- 請求項1~10のいずれか一項に記載の抗体又はその機能的断片をコードする核酸分子。
- 請求項11に記載の核酸分子を含むベクター。
- 請求項12に記載のベクターを含む細胞。
- 請求項1~10のいずれか一項に記載の抗体若しくはその機能的断片、又は請求項11に記載の核酸分子及び薬学的に許容される担体を含む医薬組成物。
- 癌又はアテローム性動脈硬化症を治療に用いるための、請求項1~10のいずれか一項に記載の抗体若しくはその機能的断片、又は請求項11に記載の核酸分子、又は請求項12に記載のベクター、又は請求項13に記載の細胞、又は請求項14に記載の医薬組成物。
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