JP2017195874A - 血管内皮成長因子融合タンパク質 - Google Patents
血管内皮成長因子融合タンパク質 Download PDFInfo
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Abstract
【解決手段】血管内皮成長因子(VEGFR)及び/又は胎盤成長因子(PIGF)に結合する融合タンパク質であって、(a)2つの重鎖がジスルフィド結合によって連結されている、IgG1のFcドメイン、及び(b)4つのVEGFR1の免疫グロブリンドメイン2、ここで2つの免疫グロブリンドメイン2は(a)のFcドメインの各重鎖に連続して融合されているタンパク質。該融合タンパク質は、細胞移動及び細胞浸潤を阻害する優れた活性を有し、様々な癌腫及び線維芽細胞に対して非常に強化された成長阻害効果を有するため、癌又は眼疾患を治療するための薬剤の調製に使用することができる。
【選択図】なし
Description
ヒトIgG1Fcドメインに融合されたヒトVEGFR2ドメイン3(KP−VR1);ヒトIgG1Fcドメイン(配列番号2)に融合されたヒトVEGFR1ドメイン2(配列番号1)(KP−VR2);ヒトIgG1Fcドメインに融合されたヒトVEGFR2ドメイン3(配列番号3)及びVEGFR1ドメイン2(KP−VR3);ヒトIgG1Fcドメインに融合されたヒトVEGFR1ドメイン2及びVEGFR2ドメイン3(KP−VR4、アフリベルセプト)を、pCHO1.0ベクター(Invitrogen)にそれぞれクローニングした。
VEGF−Aに対する本発明のKP−VR2、アフリベルセプト及びベバシズマブの結合親和性を、本実験で比較した。ELISAアッセイを、BEVACIZUMAB Summary Validation Report(2014年2月28日)に従って実施した。96ウエルプレート(Nunc)を、50ng/mL VEGFA165(I)又はVEGFA121(III)(R&D systems)でコーティングし、続いてKP−VR2、KP−VR4(アフリベルセプト)又はアバスチン(Avastin)(ベバシズマブ)を、0.0122〜1000ng/mLに量を段階的に増加させてウェルに添加した。次に、プレートを洗浄し、ペルオキシダーゼコンジュゲート抗ヒトFc抗体と反応させた。続いて、3,3,5,5−テトラメチルベンジジン(TMB)溶液(Roche)を添加し、その後吸光度をELISAリーダー(分光光度計、Biorad)を使用して450nmで検出した。図5(I及びIII)は、結果を示す。
ELISAを実行して、PlGF(胎盤成長因子)に対する本発明のKP−VR2、アフリベルセプト又はベバシズマブの結合親和性を検出した。96ウエルプレートを、50ng/mL PlGF(I)でコーティングし、続いてKP−VR2(0.0122〜1000ng/mL)、KP−VR4(アフリベルセプト)(0.390625〜16000ng/mL)又はアバスチン(ベバシズマブ)(0.0122〜1000ng/mL)を、量を段階的に増加させてウェルに添加した。続いて、プレートを洗浄し、ペルオキシダーゼコンジュゲート抗ヒトFc抗体と反応させた。次に、3,3,5,5−テトラメチルベンジジン溶液を添加し、吸光度をELISAリーダー(分光光度計、Biorad)を使用して450nmで検出した。
VEGFA165、VEGFA121又はPlGFに対するKP−VR2及びKP−VR4(アフリベルセプト)の結合活性をELISAによって決定し、結果を以下の表1(VEGF及びPIGFに対するKP−VR2及びアフリベルセプトの結合活性の比較)に示した。
SPR(表面プラスモン共鳴)を使用する結合親和性比較実験を、参考文献に従って実施した(Binding and neutralization of vascular endothelial growth factor(VEGF)and related ligands by VEGF Trap、ranibizumab and bevacizumab.Angiogenesis 2012年、15(2):171〜185頁)。最初に、SPRチップを、HBST緩衝液(50nM HEPES、150nM NaCl、0.1%Tween20)で安定化し、続いてSPRチップに1000RU(共鳴単位)の密度になるようにプロテインAを結合させた。チップを、10mMグリシン緩衝液を使用して洗浄し、残留した未結合のプロテインAをチップから除去した。次に、KP−VR2、KP−VR4(アフリベルセプト)及びベバシズマブ(2nM)をそれぞれ添加し、チップに結合させた。VEGFA165(0.5〜8nM)を、チップに流し入れた。結果を、図7及び表2に示した(VEGFに対するKP−VR2、KP−VR4及びKP−VR3の結合親和性)。
VR−2及びKP−VR4(アフリベルセプト)の薬物速度論プロファイルを評価するために、ラットを2つの群に分類した。1mg/kg KP−VR2及び1mg/kg KP−VR4(アフリベルセプト)を、一方の群のラットにi.v.(静脈内)注射し、別の群のラットにs.c.(皮下)注射した。
実施例7−1.KP−VR2及びKP−VR4(アフリベルセプト)でHUVEC(ヒト臍静脈内皮細胞)を処理した後にVEGF−Aによって誘導される細胞浸潤阻害の検出
細胞移動を、トランスウェル系で化学走性運動性アッセイを使用することにより評価して、KP−VR2による内皮細胞の細胞移動及び浸潤を検出した。成長因子を減らしたマトリゲル(Millipore)を、トランスウェル系にコーティングし、続いて細胞浸潤を、浸潤アッセイを使用することにより決定した。細胞移動及び細胞浸潤アッセイの定量分析を以下の通り行った。トランスウェルの底部を0.1%ゼラチン10μLでコーティングし、24時間乾燥させた。QCM 24ウェル細胞浸潤アッセイキット(Corning)を本実験に使用した。分離した細胞を、細胞浸潤アッセイ培地(内皮細胞基礎培地、EBM、0.1%FBS)で集めた。細胞数を5×104個細胞/300μL細胞浸潤培地に調整し、細胞を各挿入物に播種した。6つのウェルを、0〜200nM KP−VR2、KP−VR4(アフリベルセプト)(Eylea、商標)又はベバシズマブ(アバスチン、商標)で処理した。6つのウェルにVEGF(350ng/mL)を処理し、続いて37℃で48時間インキュベートした。インキュベーション後に、残留した細胞及び培地を除去し、挿入物を新しいウェルへ移動させた。次に、挿入物を細胞単離溶液225μLに入れ、インキュベータ中で、37℃で30分間更にインキュベートした。
EA−hy926細胞株(ATCC CRL−2922(商標))(3.5×105個細胞/mL)を、96ウエルプレートで0.1%FBSを有するDMEM(ダルベッコ改変イーグル培地 Sigma)に播種した。次に、プレートを、KP−VR2(1500μg/mL)、KP−VR4(アフリベルセプト)(3000μg/mL)及びベバシズマブ(3000μg/mL)それぞれにより37℃、5%CO2条件で24時間処理した。陰性対照として、融合タンパク質で処理していない培地を使用した。結果を図10a及び10bに示した。図10a及び10bに示すように、本発明のKP−VR2は、VEGFによって誘導されるEA−hy926細胞の成長及び増殖をKP−VR4(アフリベルセプト)及びベバシズマブより低い濃度で非常に効果的に阻害した。
MTS細胞増殖比色アッセイを、9種類の癌細胞株について実行して、癌細胞分裂に対するKP−VR2の阻害能を決定した。表4は本実験で使用した9つの癌細胞株を示す。
MTS細胞成長アッセイを、抗VEGFA又は抗VEGFRに抵抗性の癌細胞及び線維芽細胞株に対して実行し、癌細胞分裂に対するKP−VR2の阻害活性を評価した。表6は、本実験に使用した4種類の癌細胞株及び2種類の線維芽細胞株を示す。
様々な腫瘍異種移植片モデル(HT−29、LOVO及びSKUT1b)をBALB/cヌードマウスで利用してin vivo実験を実行し、それによりKP−VR2の腫瘍成長阻害活性を評価した。
HT−29細胞(ATCC HTB−38(商標))(5×106個細胞/0.2mL)を、ヌードマウス(Orient bio、雌、4週齢)の背部の皮下に注射した。腫瘍の体積が、200mm3より大きくなったら、KP−VR2(1mg/kg又は2mg/kg)及びKP−VR4(アフリベルセプト)(2mg/kg又は3mg/kg)それぞれをマウスの腹腔に週2回注射し、同量のPBS(リン酸緩衝食塩水)を同時間及び同期間陰性対照マウスの腹腔に注射した。腫瘍の体積を3〜4日毎に測定し、結果を図14に開示した。図14に示すように、本発明のKP−VR2は、HT−29大腸癌細胞株に対し2mg/kgの用量で、同量のアフリベルセプト(KP−VR4)と比較して約40%増加した成長阻害活性を示した。更に、同程度の効果がKP−VR2(1mg/kg)とアフリベルセプト(KP−VR4)(3mg/kg)の間に観察された。
HT−29細胞株の代わりにLOVO(ATCC CCL−229(商標))細胞株を使用して実施例10−1と同じ実験を実行した。LOVO細胞株(5×106個細胞/0.2mL)を、ヌードマウス(Orient bio、雌、4週齢)の背部の皮下に注射した。腫瘍の体積が、200mm3より大きくなったら、KP−VR2(1mg/kg)及びKP−VR4(アフリベルセプト)(1mg/kg)それぞれを、ヌードマウスの腹腔に週2回注射し、同量のPBS(リン酸緩衝食塩水)を同時間及び同期間陰性対照マウスの腹腔に注射した。腫瘍の体積を3〜4日毎に測定し、最後の42日目に腫瘍を摘出して重量を比較した。結果を図15a及び15bに開示した。図15a及び15bに示すように、本発明のKP−VR2は、直腸癌細胞株(LOVO)に対し1mg/kgの用量で、同量のアフリベルセプト(KP−VR4)と比較して50%〜60%増加した成長阻害活性を有した(P<0.05)。本発明のKP−VR2の腫瘍成長阻害活性は初回の注射から観察され、KP−VR2とアフリベルセプト(KP−VR4)の間の阻害活性の差異は注射以後に増加した。更に、本KP−VR2の注射は、同じ注射用量のアフリベルセプトと比較して約50%の腫瘍重量の減少をもたらした。
VEGFR1陽性細胞株である子宮癌SKUT1B細胞株(ATCC HTB−115(商標))を、ヌードマウスに注射した。SKUT1B細胞株(1×107個細胞/0.2mL)を、ヌードマウスの背部の皮下に注射し、KP−VR2(2mg/kg)及びKP−VR4(アフリベルセプト)(2mg/kg)それぞれを、ヌードマウスの腹腔に注射の1日〜32日後まで週2回注射した。同量のPBS(リン酸緩衝食塩水)を同時間及び同期間陰性対照マウスの腹腔に注射した。腫瘍の体積を3〜4日毎に観察し、最後の37日目に腫瘍を摘出して腫瘍の重量を比較した。結果を図16に開示した。図16a及び16bに示すように、本発明のKP−VR2は、本実験に使用した細胞株に対し2mg/kgの用量で、同量のアフリベルセプト(KP−VR4)と比較して60%〜70%増加した成長阻害活性を有した(P<0.05)。更に、本KP−VR2の注射は、同じ注射用量のアフリベルセプトと比較して約70%の腫瘍重量の減少をもたらした。
Claims (13)
- (a)2つの重鎖がジスルフィド結合によって連結されている、IgG1のFcドメイン;及び
(b)4つのVEGFR1の免疫グロブリンドメイン2、
を含む、血管内皮成長因子(VEGF)に結合する免疫グロブリン様ドメインの融合タンパク質であって、
1つの前記VEGFR1の免疫グロブリンドメイン2及びもう1つの前記VEGFR1の免疫グロブリンドメイン2が、(a)のFcドメインの各重鎖に連続して融合されている、融合タンパク質。 - (a)2つの重鎖がジスルフィド結合によって連結されている、IgG1のFcドメイン;及び
(b)4つのVEGFR1の免疫グロブリンドメイン2
を含む融合タンパク質をコードする単離された核酸分子であって、
1つの前記VEGFR1の免疫グロブリンドメイン2(配列番号1)及びもう1つの前記VEGFR1の免疫グロブリンドメイン2(配列番号1)が、(a)のFcドメインの各重鎖(配列番号2)に連続して融合されており、
前記単離された核酸分子が、前記Fcドメインをコードする核酸配列、及び4つの前記VEGFR1の免疫グロブリンドメイン2をコードする核酸配列を含む、核酸分子。 - 請求項2に記載の単離された核酸分子を含む、組換え発現ベクター。
- YAC(酵母人工染色体)、YEp(酵母エピソーム型プラスミド)、YIp(酵母組込み型プラスミド)及び組換えウイルスからなる群から選択されるいずれか1つである、請求項3に記載の組換え発現ベクター。
- 請求項4に記載の前記組換え発現ベクターを含む、宿主細胞。
- 細菌、酵母、昆虫細胞及び哺乳動物細胞からなる群から選択されるいずれか1つである、請求項5に記載の宿主細胞。
- 前記哺乳動物細胞が、CHO(チャイニーズハムスター卵巣)細胞である、請求項6に記載の宿主細胞。
- VEGFに結合する免疫グロブリン様ドメインの融合タンパク質を産生する方法であって、
(a)ポリペプチド産生のための条件下で請求項5から請求項7のいずれか一項に記載の宿主細胞をインキュベートするステップと;
(b)上記(a)で産生されたポリペプチドを回収するステップと
を含む、方法。 - 請求項8に記載の方法に従って産生された、免疫グロブリン様ドメインの融合タンパク質。
- 薬理活性成分としての請求項1に記載の融合タンパク質及び医薬的に許容される賦形剤を含む、血管形成性腫瘍を治療するための医薬組成物。
- 前記腫瘍が、大腸癌、膵臓癌、直腸癌、胃癌、腎臓癌、前立腺癌、子宮肉腫、白血病又は皮膚癌である、請求項10に記載の血管形成性腫瘍を治療するための医薬組成物。
- 薬理活性成分としての請求項1に記載の融合タンパク質及び医薬的に許容される賦形剤を含む、血管形成性眼疾患を治療するための医薬組成物。
- 前記眼疾患が、老人性黄斑変性症、滲出性老人性黄斑変性症、脈絡膜新生血管、病的近視、糖尿病性網膜症、糖尿病性黄斑浮腫、網膜血管閉塞、未熟児網膜症又は血管形成神経膠腫である、請求項12に記載の血管形成性眼疾患を治療するための医薬組成物。
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US10023627B2 (en) | 2018-07-17 |
KR101685532B1 (ko) | 2016-12-13 |
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JP6519090B2 (ja) | 2019-05-29 |
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