JP2023502501A - 眼内血管新生のための長時間作用型vegf阻害剤 - Google Patents
眼内血管新生のための長時間作用型vegf阻害剤 Download PDFInfo
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Abstract
Description
この出願は、2019年11月25日に提出された米国仮出願第62/939,756号の優先権の利益を主張し、この出願は参照により本明細書に組み込まれる。
本出願は、ASCIIフォーマットで電子的に提出され、参照によりその全体が本明細書に組み込まれる配列表を含む。2020年11月19日に作成された上記のASCIIコピーの名称は24978-0595_SL.txtであり、サイズは54,480バイトである。
D3とHPSGとの相互作用は、様々な組織内での隔離に起因するVEGFR1ベースの抗VEGF戦略の制限と長い間考えられており、結果として全身半減期が低下する。そのような問題を克服するために、HolashらはVEGFR1 D3をVEGFR2 D321に置き換えた。同じ目的のために、Leeらは、より最近、VEGFR1 D3にグリコシル化部位を導入し、正電荷を効果的に中和し、したがって、D3媒介性HSPG結合48を排除した。両方の場合において、全身半減期は、元のVEGFR1構築物21 48と比較して増加した。
VEGFR-Fc発現プラスミドの構築のために、シグナルペプチドをコードする核酸断片と、VEGRF127(遺伝子ID:2321)のうちの1~4個の細胞外Ig様ドメインの組み合わせをGenScrep USA Inc.によって合成した。以下の構築物を行った:V123、D1、D2およびD3、V23、D2およびD3、V1233、D1、D2、D3およびD3、V233 D2、D3およびD3、V1234、D1、D2、D3およびD4、V234、D2、D3およびD4、V124、D1、D2およびD4、V24、D2およびD4。合成された断片は、EcoRIおよびBgIII部位でpFUSE-hIgG1-Fc1ベクター(InvivoGen、#pfuse-hgifc1)に挿入され、様々なVEGFR1 ECDを含有するプラスミドが生成された。次に、PrimeSTAR Mutagenesis Basal Kit(Takara、R046A)を使用して、ECDとFc断片との間のインターバルアミノ酸RおよびS(BgIII部位)を除去し、227アミノ酸ヒトIgG1-Fcを有するVEGFR1 ECDの融合タンパク質を発現するプラスミドを生成した。
製造業者の指示に従い、Expi293発現系(Life technologies、A14524)を使用して、精製用の馴化培地を生成した。簡潔に、Expi293F(商標)細胞(ThermoFisher)を、8%CO2の加湿雰囲気中、37℃で、Expi293(商標)発現培地中で懸濁培養した。細胞密度が250万/mlに達したら、プラスミドDNAおよびExpiFectamine(商標)293試薬を混合し、5分間インキュベートし、細胞に添加した。DNAおよびトランスフェクトされた試薬の最終濃度は、それぞれ、1μgおよび2.7μl/ミリリットルであった。トランスフェクションの5時間後、100μg/mlのヘパリン(Sigma、H3149)およびプロテアーゼ阻害剤カクテル1:400(Sigma、P1860)を細胞に添加した。トランスフェクションの16時間後、エンハンサー試薬1および2を添加した。トランスフェクションの96時間後、馴化培地を採取した。製造業者の指示に従い、ヒトFc ELISA Kit(Syd Labs、EK000095-HUFC-2)を使用して、Fc融合タンパク質濃度についてアリコートを試験した。プロテアーゼ阻害剤をバルクに添加し(1:500)、さらに使用するまで-80℃で保存した。
発熱物質不含試薬を使用した。使用する前に、カラムおよび機器(Akta Explorer System)を0.5 NのNaOHに曝露して消毒した。トランスフェクトされた細胞からの馴化培地を、PBS、0.01%のポリソルベート(PS)20に調整した。PS20を、すべてのステップで緩衝液に添加した。20,000xgで30分間遠心分離した後、上清を、Hi-Trap MabSelect SuRe(5ml、GE Healthcare)を使用するプロテインA(PA)親和性クロマトグラフィーにかけた。ローディング後、カラムを、20mMジエタノールアミン、pH9.2、1.2MのNaClで洗浄した後、0.1Mのクエン酸、pH3.0で溶出し、これをすぐに中和した。次に、PA溶出プールを、20mMのジエタノールアミン、pH9.2に希釈し、Hi-Trap Q(GE Healthcare)陰イオン交換カラムに適用した。結合した物質を、NaClの勾配で溶出した。精製された組換えタンパク質を含有するフロースルーを、直ちに20mMのTris、pH6.8に調整し、ヘパリン-セファロース(Hi-Trap(商標)-HS)への結合により濃縮した。0.2~0.45MのNaCl(構築物に依存)で洗浄した後、組換えVEGFR1融合タンパク質を1MのNaClで溶出した。最終的な研磨ステップは、サイズ排除クロマトグラフィー(SEC)からなった。最後に、10mMのTris、pH6.8、10mMのヒスチジン、5~7%のスレアロース(threalose)、40mMのNaCl、0.01%のPS20への透析により、タンパク質を緩衝液交換した。目標は、等浸透圧製剤(約300mOsm)に近いものを得ることである。内毒素レベルを決定するために、ToxinSensor Chromogenic LAL Endotoxin Assay Kit(GenScript、L00350)を、製造業者のプロトコルに従って使用した。
内皮細胞増殖アッセイは、本質的に以前に記載されているように実施された63 64。初代ウシ脈絡膜内皮細胞(BCEC)(継代数<10)(VEC Technologies Rensselaer,NY、カタログ番号BCME-4)をトリプシン処理し、再懸濁し、10%ウシ仔牛血清、2mMグルタミンおよび抗生物質を補充した低グルコースDMEM中の96ウェルプレート(コーティングなし)に、200μl容量でウェル当たり1000細胞の密度で播種した。rhVEGF165(R&D Systems、カタログ番号293-VE-010)またはrhVEGF121(R&D Systems、カタログ番号4644-VS010)を10ng/mlの濃度で添加した。アフリベルセプト(EYLEA)は薬局から購入した。阻害剤は、リガンドを添加する前に、図に示されるように、様々な濃度で細胞に添加された。5または6日後、細胞をAlamar Blueと4時間インキュベートした。蛍光を、530nmの励起波長および590nmの発光波長で測定した。
ウシ硝子体試料(InVision BioResource,Seattle,WA)を4℃で解凍し、次いでPBSで1:1で希釈し、0.22pmのフィルターで濾過し、分取し、-80℃で保存した。総タンパク質濃度を、Pierce BCAタンパク質アッセイによって測定した。Costar 96ウェルEIA/RIAストリップウェルを、室温で4時間、硝子体(1pg/ウェル)でコーティングし、続いて、PBS-0.1% Tween 20(PBS-T)で1回洗浄した。各ウェルに、0.08~10nMのキメラVEGF受容体タンパク質を50pl体積で添加し、4℃で一晩インキュベートした。次いで、プレートをPBS - Tで洗浄し、APコンジュゲートヤギ抗ヒトFc(1:2000、Invitrogen、#A18832)とともに室温で1時間インキュベートした。プレートを、PBS-Tで洗浄した後、室温で15~30分間、1ステップPNPP基質(Thermo Scientific,Rockford,IL,#37621)を添加した。吸光度は405nmで測定されるであろう。S
雄のC57BL/6Jマウス(6~8週)を、レーザー治療の前にケタミン/キシラジンカクテルで麻酔した。CNV病変は、ダイオードレーザー(IRIDEX,Oculight GL)、ならびにスポットサイズ50um、出力180mW、および露光時間100msの細隙灯(Zeiss)を使用するレーザー光凝固によって誘導された。47,65.典型的には、4つのレーザー火傷が、各眼の視神経乳頭の周りの3、6、9、および12時の位置で誘導された。異なる構築物またはIgGアイソタイプを、1plの容量の2.5μg/眼の用量で硝子体内に注射した。EYLEAは、2.5または25μgで陽性対照として使用された。注射の1日後にレーザー治療を行い、レーザー治療の7日後に、眼を摘出し、4%のパラホルムアルデヒド(PFA)で15分間固定した。別の一連の研究では、レーザー治療の1日、7日、または14日前に、選択された構築物を1回注射した。脈絡膜-強膜複合体および網膜を分離し、網膜および脈絡膜組織の両方の全体マウント染色により血管系を証明するために抗CD31免疫蛍光法(IF)を実施した。CD31 IFの場合、ラット抗マウス抗体BD 550274を、1:100に希釈し、4℃で一晩インキュベートした。二次抗ラット抗体(Life Technologies A11006)との4時間のインキュベーション後、全体マウントを488nmで撮像した。病変領域の新生血管および網膜の血管密度の定量化は、Image Jによって行われた。P値は、スチューデントのt検定によって評価された(有意な変化、p<0.05)。
酸素誘発性網膜症(OIR)マウスモデルは、虚血性血管性眼疾患の分子変化を描写するのに有用であることが証明されている確立された方法である66 67。密閉チャンバを使用して、新生仔マウスを産後7日目(P7)からP12まで75%の酸素に曝露した後、21%の酸素(室内空気)に戻す。この高酸素症への曝露は、虚血性脈管障害の血管遮断期を模倣して、中心網膜の血管退縮と正常な橈骨血管の成長の停止を引き起こす。室内空気に戻ると、網膜の無血管領域は低酸素になる68 69。この低酸素は、血管新生因子、特にVEGF70の発現を誘導し、血管網膜と無血管網膜の接合部における異常な網膜新生血管の成長をもたらす。阻害剤の効果を試験するために、新生血管相の阻害を試験するために、高酸素症に曝露する前に硝子体内注射を実施する。P7の野生型C57BL/6jマウスは、げっ歯類のフェイスマスクを通って流れるイソフルランを使用して麻酔される。まぶたは、Vannasマイクロディセクションハサミを使用して開き、引き戻して目を露出させる。次に、ピコスプリッツァーIII(Parker Hannifin)に取り付けられた引っ張られたガラス製マイクロピペットを用いて、0.5plの溶液を硝子体内に注射する。注射後、針は30秒間目に残し、漏れを最小限に抑えるためにゆっくりと引き抜かれる。この手順は、対照として等モルのヒトIgG1(Bio X Cell,West Labanon,NH)を注射して、僚眼で繰り返される。EYLEA、種々の構築物を、種々の用量で対照IgG1に対して試験する。まぶたは抗生物質の軟膏で覆われていた。次いで、リッターをP7-P12由来の75%過酸素チャンバ内に配置して、OIR表現型を生成する。新生血管形成のピーク時であるP17では、動物を屠殺し、目を除去し、解剖し、血管をBSL-FITCで染色する。網膜を平らに取り付け、共焦点顕微鏡によって画像化した。新生血管形成の程度を、前網膜血管芽の体積を測定することによって定量化した67 70-72。血管遮断および新生血管形成を、記載したように自動ソフトウェアを使用して分析した73。
プラスミドの構築および発現
VEGFR1のシグナルペプチド(遺伝子ID:2321)およびヒトIgG1-Fcドメイン(遺伝子ID:3500)で1~3個の細胞外Ig様ドメイン(ECD)をコードする核酸断片をGenScrep USA Inc.によって合成した。断片を、XbaIおよびECoR1部位でpD2535nt-HDPデュアルEF1aプロモーターベクター(ATUM)に挿入し、227アミノ酸ヒトIgG1-FcでVEGFR1 ECDの融合タンパク質を発現するプラスミドを生成した。VEGFR1 ECD構築物は以下の通りである。V123はECD1、2および3を含み、V1233はECD1、2、3および3を含み、V233はECD2、3および3を含み、V23はECD2および3を含む。すべての構築物の真偽を配列解析によって検証した。
より高いレベルのV1233タンパク質(20~30ug/ml)クローン14、26、44および46を発現するHorizon Discovery(HD)-BIOP3 CHO細胞を精製する。4つのクローンはすべて、同様の最終生成物を得たので、その後の精製のために、クローン26を使用した。V1233-26からおよそ10mgに相当する条件培地を以下のように行った。37℃で解凍した条件培地を5%PBSおよび0.01%(v/v)Tween20に調整し、20,000gで30分間4℃で遠心分離した。1×PBSおよび0.01%Tween20で平衡化したプロテインAカラム(HiTrap(商標)MabSelect(商標)Sure5ml)(GE Healthcare)に、明確化した抽出物を適用した。カラムを、高pH、高塩緩衝液(5CV:20mMのエタノールアミン(pH9.2、1.2MのNacl、0.01%Tween20)、および結合したタンパク質を0.1Mのクエン酸(pH3.0)によって溶出させ、1MのTris(pH9.5)の体積の1/5を添加することによって直ちに中和した。Flt1タンパク質を含有する画分をプールし、20mMのエタノールアミン(pH9.2、0.01%Tween20)中で10倍に希釈し、HiTrap(商標)Q HP5ml(GE Healthcare)アニオン交換カラムに適用した。フロースルーに存在するFlt1タンパク質を、10%v/vの0.5MのTris(pH6.8)を添加することによってpH6.8に調整し、20mMのTris(pH6.8)、0.01%Tween20中で平衡化したHiTrap(商標)HPヘパリン1mlカラムに適用した。カラムを緩衝液中の0.45MのNaClで洗浄し、続いて1MのNaCl中で最終溶出した。Flt1陽性画分をプールし、10mMのTris(pH7.2、0.4m NaCl、0.01%Tween20)中のHiLoad Superdex 16×600カラム(GE Healthcare)中のゲル濾過クロマトグラフィーに供した。高分子量凝集塊を除く画分をプールし、HiTrap(商標)Heparin HP1mlカラムに結合した後に濃縮し、続いて前述のように1MのNaCl溶出を行った。
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Claims (15)
- 必要としている対象においてVEGFに関連する眼の障害を治療する方法であって、第1の治療有効量の抗VEGF剤を前記対象に硝子体内投与することと、前記先の投与から10~30週間以内に第2の治療有効量の前記抗VEGF剤を前記対象に硝子体内投与することと、を含み、前記抗VEGF剤が、Fc-IgGに作動可能に連結されたVEGF結合部分を含み、前記VEGF結合部分が、VEGFR-1のIgG様ドメイン2である少なくとも1つのVEGF結合ドメインを含む、方法。
- 前記第2の治療有効量の前記抗VEGF剤が、前記先の投与から16~24週間以内に硝子体内投与される、請求項1に記載の方法。
- 前記治療有効量の前記抗VEGF剤の後続投与が、前記先の投与から10~30週間以内に、少なくとも1年間、硝子体内投与される、請求項1に記載の方法。
- 前記抗VEGF剤が、アフリベルセプトよりも優れた硝子体結合能力を有する、請求項1に記載の方法。
- 前記抗VEGF剤が、アフリベルセプトよりも優れた硝子体結合VEGF刺激内皮細胞増殖阻害能力を有する、請求項1に記載の方法。
- 前記抗VEGF剤が、アフリベルセプトよりも優れたVEGF刺激有糸分裂誘発阻害能力を有する、請求項1に記載の方法。
- 前記VEGF結合部分が、本質的にVEGFR-1のIgG様ドメイン1、2、および3(V1-2-3)からなる、請求項1に記載の方法。
- 前記VEGF結合部分が、本質的にVEGFR-1のIgG様ドメイン2および3(V2-3)からなる、請求項1に記載の方法。
- 前記VEGF結合部分が、本質的にVEGFR-1のIgG様ドメイン1、2、3および3(V1-2-3-3)からなる、請求項1に記載の方法。
- 前記VEGF結合部分が、本質的にVEGFR-1のIgG様ドメイン2、3および3(V2-3-3)からなる、請求項1に記載の方法。
- 前記治療有効量の前記抗VEGF剤が、約1~10mgである、請求項1に記載の方法。
- 前記治療有効量の前記抗VEGF剤が、約3~6mgである、請求項1に記載の方法。
- 前記VEGFに関連する眼の障害が、新生血管加齢性黄斑変性症、近視に続発する脈絡膜新生血管、増殖性糖尿病性網膜症、糖尿病性黄斑浮腫、網膜静脈閉塞症などの網膜血管閉塞、眼の腫瘍、フォンヒッペル・リンダウ症候群、未熟児網膜症、およびポリープ状脈絡膜血管症を含む群から選択される、請求項1に記載の方法。
- 必要としている対象において眼内新生血管を促進する方法であって、第1の治療有効量の抗VEGF剤を前記対象に硝子体内投与することと、先の投与から10~30週間以内に第2の治療有効量の前記抗VEGF剤を前記対象に硝子体内投与することと、を含み、前記抗VEGF剤が、Fc-IgGに作動可能に連結されたVEGF結合部分を含み、前記VEGF結合部分が、VEGFR-1のIgG様ドメイン2である少なくとも1つのVEGF結合ドメインを含む、方法。
- 必要としている対象においてVEGFに関連する眼の障害を治療する際に使用するための薬学的組成物であって、前記抗VEGF剤が、請求項1~13のいずれか一項に定義される通りである、薬学的組成物。
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2020
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- 2020-11-20 MX MX2022006241A patent/MX2022006241A/es unknown
- 2020-11-20 WO PCT/US2020/061519 patent/WO2021108255A1/en unknown
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- 2020-11-20 KR KR1020227020414A patent/KR20220104756A/ko unknown
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WO2019147944A1 (en) * | 2018-01-26 | 2019-08-01 | The Regents Of The University Of California | Methods and compositions for treatment of angiogenic disordres using anti-vegf agents |
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BR112022010113A2 (pt) | 2022-09-06 |
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