JP2023533669A - C5に結合する抗体及びその用途 - Google Patents
C5に結合する抗体及びその用途 Download PDFInfo
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Abstract
Description
本出願は、2020年7月15日に出願された米国仮特許出願シリアル番号63/051,966の優先権を主張するものである。
(a)表1において上記に列挙されたアミノ酸配列を含んでいてもよい重鎖可変領域;及び
(b)表1において上記に列挙されたアミノ酸配列を含んでいてもよい軽鎖可変領域、又は別の抗C5抗体のVLからなり、ここで抗体はヒトC5を特異的に結合することができる。
(a)表1において上に挙げた重鎖可変領域のCDR1、CDR2、及びCDR3領域;ならびに
(b)表1において上に挙げた軽鎖可変領域のCDR1、CDR2、及びCDR3領域又は別の抗C5抗体のCDRからなり得、ここで、抗体はヒトC5を特異的に結合する。
(a)重鎖可変領域CDR1配列は、上記表1に記載の配列、及び/又はその保存的修飾を含んでいてもよい;及び/又は
(b)重鎖可変領域CDR2配列は、上記表1に記載の配列、及び/又はその保存的修飾を含んでいてもよい;及び/又は
(c)重鎖可変領域CDR3配列は、上記表1に記載の配列、及び/又はその保存的修飾を含んでいてもよい;及び/又は
(d)軽鎖可変領域CDR1、及び/又はCDR2、及び/又はCDR3配列は、上記表1に記載の配列、及び/又はその保存的修飾を含んでいてもよい;及び/又は
(e) 抗体は、ヒトC5と特異的に結合する。
<免疫化>
トランスジェニックマウスプラットフォームCAMouseHG (HG5042, Chongqing Camab Biotech Ltd.) を用いて、完全ヒト抗体を作製した。E Harlow, D. Lane, Antibody: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. , 1998に記載の方法に従い、トランスジェニックマウスを免疫化した。リコンビナントヒトC5タンパク質(Sino biological Inc.、Cat#13416-H18H)を免疫原として、また抗血清力価の測定及び抗原特異的抗体を分泌するハイブリドーマのスクリーニングに使用した。免疫量は、一次免疫ではマウス1匹当たり50μgのヒトC5タンパク質を注射し、ブースト免疫ではマウス1匹当たり25μgのヒトC5タンパク質を注射した。免疫反応を高めるために、一次免疫には完全フロイトのアジュバント、ブースト免疫には不完全フロイトのアジュバント(Sigma, St. Louis, Mo.)。簡単に言うと、アジュバントと抗原の混合物を以下のように調製した。まず、アジュバントをバイアル内でボルテックスを使って穏やかに混合した。所望の量のアジュバントをオートクレーブした1.5mLマイクロ遠心管に移した。抗原はPBS又は生理食塩水で0.25~0.5 mg/mlの濃度で調製した。次に、計算された量の抗原をアジュバントとともに遠心管に加え、得られた混合物を2分間穏やかにボルテックスして混合し、油中水型エマルジョンを生成した。その後、アジュバント-抗原エマルジョンを動物注射に適したシリンジに引き込んだ。合計50又は25μgの抗原を、150~200μlの容量で注射した。各動物は免疫され、その後、抗血清力価に応じて3~4回ブーストされた。良好な力価の動物には、ハイブリドーマ融合の前に腹腔内注射で最終ブーストを行った。
マウス骨髄腫細胞株(SP2/0-Ag14、ATCC#CRL-1581)の細胞を、融合直前に対数期段階に達するようにイベキュートした。免疫したマウスの脾臓細胞を無菌的に調製し、Kohler G, and Milstein C, "Continuous cultures of fused cells secreting antibody of predefined specificity," Nature, 256:495-497 (1975) に記載の方法に従ってマウスミエロマ細胞と融合させた。融合した「ハイブリッド細胞」は、その後、DMEM/20% FCS/HAT培地中の96ウェルプレートに分注された。融合後7日から10日目に生存しているハイブリドーマコロニーを顕微鏡で観察した。2週間後、各ウェルの上清を、ヒトC5タンパク質(Sino biological Inc.、Cat#13416-H18H)を用いた捕捉ELISAに供した。ヒトC5タンパク質に結合する抗体を分泌する陽性ハイブリドーマを選択し、24ウェルプレートに移した。このハイブリドーマクローンをさらに試験し、高い特異的ヒトC5結合能と補体介在性溶血阻止活性を示す抗体を産生するものを、細胞株のクローナリティを確保するために限定希釈によりサブクローニングした。その後、モノクローナル抗体の精製を行った。簡単に説明すると、プロテインAセファロースカラム(bestchrom(Shanghai)Biosciences社製、Cat#AA0273)を、5~10カラム容量でPBSバッファーを用いて洗浄した。開示の各モノクローナルハイブリドーマの細胞上清をカラムに通した後、タンパク質に対する吸光度がベースラインに達するまでPBSバッファーでカラムを洗浄した。カラムを溶出緩衝液(0.1M Glycine-HCl, pH 2.7)で溶出し、直ちに中和緩衝液(1M Tris-HCl, pH 9.0)で1.5mlチューブに採取した。免疫グロブリンを含む画分をプールし、PBS中で4℃、一晩透析した。
実施例1で生成した精製抗C5モノクローナル抗体(mAbs)を、Biacore T200システム(GE healthcare, Pittsburgh, PA, USA)により結合親和性及び結合動態を特性評価した。
[表2-1.ヒトC5及びカニクイザルC5に対する抗C5抗体の結合親和性]
[表2-2.変異型ヒトC5に対する抗C5抗体の結合親和性]
本開示の抗体は、さらに抗体捕捉ELISA及び間接ELISAにより、C5への結合能を試験した。
簡単に言うと、96ウェルプレートに、PBS中2μg/mlのAffiniPure ヤギ抗ヒトIgG, Fcγ断片特異的(Jackson Immuno Research, Cat#109-005-098), 100μl/ウェルで、37℃で2時間コーティングした。プレートを洗浄バッファー(PBS+0.05% TweenTM-20、PBST)で1回洗浄し、200μl/ウェルのブロッキングバッファー(PBST中の5% w/v無脂肪乳)で4℃にて一晩阻害した。プレートを再度洗浄し、それぞれ100μl/ウェルの順次希釈した本開示の抗C5抗体、エクリズマブ、hIgG(静脈注射用ヒト免疫グロブリン(pH4)、Hualan Biological Engineering Inc.)(PBST中の2.5%無脂肪乳で5倍希釈、66.7nMから開始)を37℃で40分間イベキュートし、再度4回洗浄した。捕捉した抗体を含むプレートを、100 μl/ウェルのビオチン標識ヒトC5-hisタンパク質(Sino biological Inc, Cat#13416-H18H, 2.5%w/v無脂肪乳を含むPBST中0.9nM)と37℃で40分間インキュベートし、4回洗浄後、ストレプトアビジン結合HRP(PBST中1:5000希釈、Jackson Immuno Research, Cat#016-030-084, 100 μl/ウェル)と37℃で40分間インキュベートした。最終洗浄後、プレートを100 μl/ウェル ELISA基質TMB(Innoreagents, Cat#TMB-S-002)と共にインキュベートした。3分後に室温で50 μl/ウェル 1M H2SO4 で反応を停止させた。各ウェルの吸光度を、TMBを450nm、630nm を参照波長とする二波長モードにし、マイクロプレートリーダーで読み取り、OD(450-630)値を抗体濃度に対してプロットした。データは Graphpad Prism ソフトウェアを使用して解析し、EC50 値を報告した。
Cynomolgus又はヒトC5変異体タンパク質に対する抗C5抗体の交差反応を測定した。
本開示の抗C5抗体がエクリズマブ-ヒトC5結合を阻害する能力は、競合ELISAアッセイで測定された。
抗C5抗体A5H1D11A7及びA3C8E4H1について、熱安定性を試験した。簡単に言うと、GloMeltTMThermal Shift Protein Stability Kit(Biotium,Cat# 33022-T)を用いて、タンパク質熱シフトアッセイによりTm(溶融温度)を測定した。GloMeltTM染料を解凍し、室温に戻した。色素の入ったバイアルをボルテックスし、遠心分離した。次に、10倍色素を、5 μL の 200倍色素を95 μL の PBS に加えて調製した。得られた2 μL の 10倍色素に、10 μg のヒト化抗体に加え、PBS を、総反応体積が 20 μLになるまで加えた。色素と抗体の入ったチューブを軽く回転させ、表3のパラメータでメルトカーブプログラムを設定したリアルタイムPCRサーモサイクラー(Roche,LightCycler 480 II)にセットした。
[表3.メルトカーブプログラムのパラメータ]
[表4.抗C5抗体の融解温度]
本開示の抗C5抗体は、補体介在性溶血に対する阻害効果についてさらに試験された。
本開示におけるすべての抗C5抗体の配列を決定し、完全な重鎖及び軽鎖可変領域配列ならびに定常領域配列を得た。重鎖及び軽鎖可変領域の配列ID NOを表1に示し、重鎖及び軽鎖のアイソタイプは、データベースの配列アラインメントによりそれぞれヒトIgG1及びカッパであると決定された。
Claims (19)
- 補体成分5に結合する単離モノクローナル抗体またはその抗原結合部分であって、(i)VH CDR1領域、VH CDR2領域およびVH CDR3領域を含み得る重鎖可変領域を含む、単離モノクローナル抗体またはその抗原結合部分。ここで、VH CDR1領域、VH CDR2領域およびVH CDR3領域は、以下に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%または100%の同一性を有するアミノ酸配列を含み得る。(1)配列番号1、7及び14、それぞれ;(2)配列番号2、8及び15、それぞれ;(3)配列番号2、8及び16、それぞれ;(4)配列番号3、9及び17、それぞれ;(5)配列番号4、10及び18、それぞれ;(6)配列番号4、11及び18、それぞれ;(7)配列番号4、12及び18、それぞれ;(8)配列番号5、12及び18、それぞれ;または (9)配列番号6、13及び19、それぞれ;及び/又は(ii)VL CDR1領域、VL CDR2領域及びVL CDR3領域を含み得る軽鎖可変領域であって、VL CDR1領域、VL CDR2領域及びVL CDR3領域は、以下に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、100%の同一性を有するアミノ酸配列から構成されていてもよい。(1)配列番号20、25及び31、それぞれ;(2)配列番号20、26及び32、それぞれ;(3)配列番号20、25及び33、それぞれ;(4)配列番号21、27及び34、それぞれ;(5)配列番号22、28及び35、それぞれ;(8)配列番号23、29及び36、それぞれ;又は (7)配列番号24、30及び37、それぞれ;
- 重鎖可変領域及び軽鎖可変領域を含む、請求項1に記載の単離モノクローナル抗体又はその抗原結合部分であって、VH CDR1領域、VH CDR2領域、VH CDR3領域、VL CDR1領域、VL CDR2領域及びVL CDR3領域は、以下に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%または100%の同一性を有するアミノ酸配列を含む、請求項1に記載の抗原結合部分。(1)配列番号1、7、14、20、25及び31、それぞれ;(2)配列番号2、8、15、20、26及び32、それぞれ;(3)配列番号2、8、16、20、25及び33、それぞれ;(4)配列番号3、9、17、21、27及び34、それぞれ;(5)配列番号4、10、18、22、28及び35、それぞれ;(6)配列番号4、11、18、22、28及び35、それぞれ;(7)配列番号4、12、18、23、29及び36、それぞれ;(8)配列番号5、12、18、23、29及び36、それぞれ;又は(9)配列番号6、13、19、:24、30及び37、それぞれ;
- 重鎖可変領域が、配列番号38、39(X1=I、X2=I、X3=S、X4=F;X1=L、X2=M、X3=G、X4=L)、40、41(X1=T、X2=N;X1=S、X2=F)、42(X1=R;X1=K)又は43に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%又は100%の同一性を有するアミノ酸配列を含む、請求項1に記載の単離モノクローナル抗体又はその抗原結合部分。
- 軽鎖可変領域が、配列番号44(X1=S、X2=S、X3=F;X1=S、X2=S、X3=F;X1=T、X2=H、X3=I)、45、46、47、48、又は59に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%又は100%の同一性を有するアミノ酸配列を含む、請求項1に記載の単離モノクローナル抗体又はその抗原結合部分。
- 重鎖可変領域および軽鎖可変領域が、以下に対して少なくとも85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%または100%の同一性を有するアミノ酸配列を含む、請求項2に記載の分離モノクローナル抗体、またはその抗原結合部分。(1)配列番号38及び44(X1=S、X2=S、X3=F)、それぞれ;(2)配列番号39(X1=I、X2=I、X3=S、X4=F)及び59、それぞれ;(3)配列番号39(X1=L、X2=M、X3=G、X4=L)及び44(X1=T、X2=H、X3=I)、それぞれ;(4)配列番号40及び45、それぞれ;(5)配列番号41(X1=T、X2=N)及び46、それぞれ;(6)配列番号41(X1=S、X2=F)及び46、それぞれ;(7)配列番号42(X1=R)及び47、それぞれ;(8)配列番号42(X1=K)及び47、それぞれ;又は (9)配列番号43及び48、それぞれ;
- 重鎖可変領域に連結した配列番号49のアミノ酸配列を有する重鎖定常領域、及び軽鎖可変領域に連結した配列番号50のアミノ酸配列を有する軽鎖定常領域を含む、請求項1に記載の単離モノクローナル抗体、又はその抗原結合部。
- IgG1、IgG2又はIgG4アイソタイプである、請求項1記載の単離モノクローナル抗体又はその抗原結合部分。
- a)野生型ヒトC5と結合する;(b)R885C変異を有するヒトC5と結合する;(c)サルC5と結合する;(d)補体介在性溶血を阻止する;及び/又は(e)補体介在性炎症を阻止する、請求項1記載の単離モノクローナル抗体又はその抗原結合部分。
- ヒト抗体である、請求項1に記載の単離モノクローナル抗体又はその抗原結合部分。
- 請求項1記載の単離モノクローナル抗体又はその抗原結合部位をコードするヌクレオチド。
- 請求項10に記載のヌクレオチドを含む発現ベクター。
- 請求項11に記載の発現ベクターを含んでなる宿主細胞。
- 請求項1記載の単離モノクローナル抗体又はその抗原結合部分と、薬学的に許容される担体とを含む医薬組成物。
- 抗炎症剤をさらに含む、請求項13に記載の医薬組成物。
- 過剰なC5a及び/又はC5bの産生に関連する疾患を治療するための方法であって、請求項13に記載の医薬組成物の治療有効量を被験者に投与することを含む、前記方法。
- 前記疾患が炎症性疾患である、請求項15に記載の方法。
- 前記炎症性疾患が、全身性重症筋無力症又は視神経脊髄炎スペクトラム障害である、請求項16に記載の方法。
- 前記疾患が溶血性疾患である、請求項15に記載の方法。
- 溶血性疾患が発作性夜間ヘモグロビン尿症又は非定型溶血性尿毒症症候群である、請求項18に記載の方法。
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US6074642A (en) * | 1994-05-02 | 2000-06-13 | Alexion Pharmaceuticals, Inc. | Use of antibodies specific to human complement component C5 for the treatment of glomerulonephritis |
ZA200807620B (en) * | 2006-03-08 | 2009-12-30 | Archemix Corp | Complement binding aptamers and anti-C5 agents useful in the treatment of ocular disorders |
WO2010015608A1 (en) * | 2008-08-05 | 2010-02-11 | Novartis Ag | Compositions and methods for antibodies targeting complement protein c5 |
CA3055541A1 (en) * | 2017-03-06 | 2018-09-13 | The Trustees Of The University Of Pennsylvania | Anti-c5 antibodies and uses thereof |
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2021
- 2021-07-15 EP EP21842536.1A patent/EP4181958A4/en active Pending
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JP2017226655A (ja) * | 2016-06-17 | 2017-12-28 | 中外製薬株式会社 | 抗c5抗体および使用方法 |
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