JP7487989B2 - 抗メソテリンscFvを含むキメリック抗原受容体及びその用途 - Google Patents
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Description
MALPTARPLLGSCGTPALGSLLFLLFSLGWVQPSRTLAGETGQEAAPLDGVLANPPNISSLSPRQLLGFPCAEVSGLSTERVRELAVALAQKNVKLSTEQLRCLAHRLSEPPEDLDALPLDLLLFLNPDAFSGPQACTRFFSRITKANVDLLPRGAPERQRLLPAALACWGVRGSLLSEADVRALGGLACDLPGRFVAESAEVLLPRLVSCPGPLDQDQQEAARAALQGGGPPYGPPSTWSVSTMDALRGLLPVLGQPIIRSIPQGIVAAWRQRSSRDPSWRQPERTILRPRFRREVEKTACPSGKKAREIDESLIFYKKWELEACVDAALLATQMDRVNAIPFTYEQLDVLKHKLDELYPQGYPESVIQHLGYLFLKMSPEDIRKWNVTSLETLKALLEVNKGHEMSPQAPRRPLPQVATLIDRFVKGRGQLDKDTLDTLTAFYPGYLCSLSPEELSSVPPSSIWAVRPQDLDTCDPRQLDVLYPKARLAFQNMNGSEYFVKIQSFLGGAPTEDLKALSQQNVSMDLATFMKLRTDAVLPLTVAEVQKLLGPHVEGLKAEERHRPVRDWILRQRQDDLDTLGLGLQGGIPNGYLVLDLSMQEALSGTPCLLGPGPVLTVLALLLASTLA(配列番号9)
標的抗原であるメソテリン(MSLN:mesothelin)に結合する抗体を選別するために、KBIOヒト合成scFvファージディスプレイライブラリーKscFv-Iを利用し、五松先端医療産業振興財団新薬開発支援センターで構築したファージパンニングプロトコルにより、MSLN(Acro Biosystems)に係わるファージパンニングを4回目まで行った。該ファージディスプレイ抗体ライブラリーパンニング過程を、図1に模式化して示した。
前記実施例1のファージパンニングによって得たファージのうちから、抗原MSLNに特異的に結合するクローン(clone)を選別するために、免疫チューブを利用したパンニング3回目で得た470(94コロニーx5プレート)個クローンに対し、単一クローンファージELISAを遂行した。具体的には、96-ハーフ(half)ウェルELISAプレートに、1μg/mLのヒトMSLNタンパク質(抗原)を、ウェル当たり30μLずつ入れ、4℃で一晩培養してコーティングした。陰性対照群として、他のプレートには、PBSを、ウェル当たり30μLずつ入れ、4℃で一晩培養した。翌日、プレート内容物を除去し、5% MPBS 150μLを使用し、プレートを室温で1時間ブロッキングさせた。その後、プレート内容物を除去し、ファージ(~1,011c.f.u.)30μLを添加し、常温で1.5時間培養した。陰性対照群の場合、ファージの代わりに、PBS 30μLを添加した。PBS-T(PBS-0.05% Tween 20)溶液でプレートを4回洗浄し、抗M13-HRP(PBSでもって、1:5,000に希釈)を添加し、37℃で1時間培養した。PBS-T溶液でプレートを4回洗浄し、各ウェル当たりTMB基質試薬(TMB substrate)を30μLずつ添加し、室温で8分間培養し、発色反応を誘導した。ウェル当たり2N H2SO4 30μLを添加し、発色反応を停止させた後、450nmにおける吸光度 (O.D.)を測定した。
前記実施例2で選別された総120種の陽性クローンからファージを回収した後、DNA配列分析を進め、カバット(Kabat)ナンバリングシステムによって配列を整列し、グルーピングした。その結果、CDR配列が異なる抗原MSLNに係わる22種の特異クローン(unique clone)を選別した。前記22種クローンの抗原MSLNに対する特異的結合を確認するために、各ファージを精製し、ファージ力価(phage titer)を同一に合わせた後(3.3E+11pfu/ウェル)、ELISAを介して比較した。陰性対照群としては、MSLNと同一に、ヒスチジンタッグ(His tag)に接合されたTLR4抗原を使用した。その結果を図3に示した。
前記実施例3で選別された19種のファージクローンが、実際の細胞膜に存在するメソテリンに結合するか否かということを調べるために、メソテリン過発現細胞株である膵臓癌細胞株AsPC-1、及び対照群としてのヒト慢性骨髄白血病細胞株K562を使用し、流細胞分析(flow cytometry analysis)を行った。
前記実施例4で選別された3種クローンを使用し、抗体断片発現菌株であるTop10F’ competent E.coliを形質転換(transformation)した。その後、3種クローンに形質転換されたE.coli菌株を、それぞれTB培地200mLで培養しながら、IPTG(最終濃度0.5mM)でタンパク質発現を誘導した後、30℃で一晩培養した。前記培養液を遠心分離して細胞を獲得し、細胞形質抽出(periplasmic extraction)を介し、水溶性タンパク質を確保した後、タンパク質Lレジン(protein L resin)を利用した親和度クロマトグラフィ(affinity chromatography)を介し、抗MSLN-scFv抗体を精製した。前記精製された抗体タンパク質をSDS-PAGEによって分析し、その結果を図6に示した。
前記実施例5で製造された3種の抗MSLN抗体タンパク質を利用したELISAを介し、各抗体の抗原MSLNに係わる親和度を比較分析した。具体的には、MaxiSorb ELISAプレート(Nunc)に、ヒトメソテリンタンパク質30μLを、ウェル当たり1μg/mLの濃度でコーティングし、4℃で一晩培養した。プレート内容物を除去し、5% MPBS 300μLを使用し、プレートを室温で1時間ブロッキングさせた。精製された抗体を、PBSで連続して希釈し、各ウェルに30μLずつ添加し、室温で2時間培養した。陰性対照群としては、精製された抗体の代わりに、PBS 60μLを添加し、37℃で2時間培養した。
前記実施例6で製造された抗MSLN抗体タンパク質において、メソテリンが過発現された細胞株と高い結合特異性を示したMSLN3を基に、抗MSLNキメリック抗原受容体を構築した(抗MSLN-CAR)。
ベクターとしては、新薬開発支援センターで保有した2世代CARレンチウイルス用ベクター(pLV lentiviral vector)システムに属することであり、前記システムは、gag/polをコーディングするpMDLg/pRRE(Addgene)、Revタンパク質をコーディングする外被(envelope)プラスミドpRSV-Rev(Addgene)、及びVSV-Gタンパク質をコーディングする外被プラスミドpMD2.G(Addgene)をいずれも含む。
前記実施例7-1で作製された組み換えベクターを、HEK293T細胞に導入し、抗MSLN-CARレンチウイルスを生産した。MSLN特異的抗原結合ドメインを含む一態様による抗MSLN-CAR発現システムの模式図を図8に示した。まず、DNA形質転換1日前、100mm組織培養ディッシュに、HEK293T細胞を、6x106細胞/ディッシュでシーディングした。翌日、細胞密度が70~80%に逹したとき、試薬マニュアルにより、リポフェクタミン3000(Lipofectamine 3000(ThermoFisher))で、MSLN-CAR-pLV、pMDLg/pRRE(Addgene)、pRSV-Rev(Addgene)、pMD2.G(Addgene)(5.5μg:3.5μg:1.5μg:2μg)の形質転換を進めた。対照群としては、CD19(FMC63)を使用した。形質転換遂行4時間後、3% FBS(Gibco)が含まれたDMEM培地に替え、48時間後、ウイルス培養液を収穫した。遠心分離用チューブに、20%スクロース溶液10mLを入れ、その上に、収穫されたウイルス培養液20mLを用心深く込めた後、SW32Tロータに装着させ、25,000rpmで、4℃で90分間超高速遠心分離を実施した。遠心分離が終わった後、チューブ底にあるウイルスペレットが落ちないように注意し、上澄み液を捨て、RPMI1640培地(Gibco)400μLを入れ、冷蔵庫で16時間培養した後、再浮遊させ、100μLずつ分注し、-80℃で保管した。
8-1:レンチウイルスの形質導入(transduction)
DPBS 5mLに、抗CD3(1μg/mL)抗体、抗CD28(3μg/mL)抗体を、それぞれ指定された濃度になるように製造し、ボルテックシングさせた後、24-ウェルプレートに、500μl/ウェルでコーティングし、4℃冷蔵庫で一晩保管した。翌日、T細胞培養液(10% FBS+RPMI1640+200IU IL-2)9mLに、PBMC(ヒト一次PBMC)を溶かし、1,500rpmで5分間遠心分離した。その後、上澄み液を除去し、培養液1mLに再浮遊させてセルカウンティングし、1x106細胞/mLに希釈し、抗体がコーティングされた24-ウェルプレートにシーディングした後、37℃,CO2培養基に入れて培養した。3日後、PBMC細胞をいずれも収穫し、レンチウイルス感染のために、5x105細胞/500μLに、レンチウイルスをMOI(multiple of infection)5になるように合わせ、プロタミン硫酸塩(protamine sulfate)10μg/mLを添加し、新たな24-ウェルプレートにシーディングした(a)。前記24-ウェルプレートを、300g、32℃で90分間遠心分離した後、37℃,CO2培養基に入れて培養した(b)。翌日、T細胞をいずれも収穫し、前述の(a),(b)段階をさらに1回遂行した。その後、T細胞をいずれも収穫し、1,500rpmで5分間遠心分離して上澄み液を除去し、T細胞を培養液に再浮遊させ、さらに培養した。
前述の実施例8-1で製造された抗MSLN-CARが導入されたT細胞におけるCARの発現有無を確認した。T細胞のレンチウイルス形質導入完了5日後、一部抗MSLN-CAR-T細胞を収穫し、ビオチン・MSLN(AcroBiosystemsまたはBioLegend)を入れ、20分間、氷上で培養した後、細胞を洗浄し、PE・抗ビオチン1μLを添加し、20分間、氷上で培養した。細胞洗浄後、FACS Canto II(BD)を利用し、CAR発現率を確認し、それを図9A及び表7に示した。また、抗MSLN-CAR-Tを14日間培養しながら、最終的に分化されたT細胞(CD3)の発現を、FACSを介して分析し、CD3陽性T細胞における、CD4+T細胞及びCD8+T細胞の比率を測定し、結果を図9Bに示した。
9-1:腫瘍動物基盤抗MSLN-CAR-T細胞の投与
卵巣癌(OVCAR 3)動物モデルにおいて、MSLN3-CART細胞治療剤の有効性を確認する実験を行った。具体的には、前記実施例9で確認された抗MSLN3-CAR-T細胞の癌細胞に対する細胞死滅効果を基に、腫瘍卵巣癌動物モデルを構築し、腫瘍殺傷能を確認した。
前述の実験群分離後、抗MSLN-CAR-T細胞を、尾静脈に単回投与し、試験群の体重、腫瘍サイズ、腫瘍体積及び腫瘍重量は、投与開始日から週2回測定した。
実験群分離後、抗MSLN-CAR-T細胞を尾静脈に単回投与し、50mg/kgのゾレチル(Zoletil)TMと10mg/kgのキシラジン(xylazine)とを腹腔注射し、麻酔を誘導させ、腹腔を開腹し、腹帯静脈から採血後に放血し、安楽死を進めた。その後、群当たり3匹を任意に選別し、分離された腫瘍の一部を、10%中性ホルマリンに固定させた後、スライドを作製し、hCD3ε(細胞信号伝逹(Cat.No58061))につき、免疫組織化学染色(IHC:immunohistochemistry)を施した。その後、該スライドは、PANNORAMIC SCAN II(3DHISTECH(ハンガリー))を利用して撮影し、3DHISTECHソフトウェアを利用して分析し、各群の前記免疫染色を5xの倍率で確認した結果、及び20xの倍率で確認した結果をそれぞれ図14及び図15に示した。
Claims (16)
- 配列番号1によってなるアミノ酸配列を含む重鎖CDR1、配列番号2によってなるアミノ酸配列を含む重鎖CDR2、及び配列番号3によってなるアミノ酸配列を含む重鎖CDR3を含む重鎖可変領域と、
配列番号4によってなるアミノ酸配列を含む軽鎖CDR1、配列番号5によってなるアミノ酸配列を含む軽鎖CDR2、及び配列番号6によってなるアミノ酸配列を含む軽鎖CDR3を含む軽鎖可変領域と、を含む、抗メソテリン抗体またはその抗原結合断片。 - 配列番号7によってなるアミノ酸配列を含む重鎖可変領域を含む、請求項1に記載の抗メソテリン抗体またはその抗原結合断片。
- 配列番号8によってなるアミノ酸配列を含む軽鎖可変領域を含む、請求項1に記載の抗メソテリン抗体またはその抗原結合断片。
- 配列番号7によってなるアミノ酸配列を含む重鎖可変領域、及び配列番号8によってなるアミノ酸配列を含む軽鎖可変領域を含む、請求項1に記載の抗メソテリン抗体またはその抗原結合断片。
- 請求項1ないし4のいずれか1項に記載の抗体またはその抗原結合断片をコーディングする、分離された核酸。
- 請求項5に記載の分離された核酸を含む、ベクター。
- 請求項6に記載のベクターによって形質転換された、分離された宿主細胞。
- 請求項7に記載の宿主細胞を培養し、抗体を発現させる段階を含む、抗メソテリン抗体を製造する方法。
- 抗原結合ドメイン、ヒンジ(hinge)ドメイン、膜貫通ドメイン及び細胞内信号伝逹ドメインを含むキメリック抗原受容体であって、
前記抗原結合ドメインは、配列番号1によってなるアミノ酸配列を含む重鎖CDR1、配列番号2によってなるアミノ酸配列を含む重鎖CDR2、及び配列番号3によってなるアミノ酸配列を含む重鎖CDR3を含む重鎖可変領域と、
配列番号4によってなるアミノ酸配列を含む軽鎖CDR1、配列番号5によってなるアミノ酸配列を含む軽鎖CDR2、及び配列番号6によってなるアミノ酸配列を含む軽鎖CDR3を含む軽鎖可変領域と、を含む、抗メソテリン抗体またはその抗原結合断片である、キメリック抗原受容体。 - 前記抗原結合ドメインは、配列番号7によってなるアミノ酸配列を含む重鎖可変領域、及び配列番号8によってなるアミノ酸配列を含む軽鎖可変領域を含む抗メソテリン抗体またはその抗原結合断片である、請求項9に記載のキメリック抗原受容体。
- 前記抗原結合断片は、scFv(single chain variable fragment)である、請求項9に記載のキメリック抗原受容体。
- 請求項9に記載のキメリック抗原受容体をコーディングする、ポリヌクレオチド。
- 請求項12に記載のポリヌクレオチドを含む、ベクター。
- 請求項13に記載のベクターによって形質転換された、分離された細胞。
- 前記細胞は、T細胞、NK細胞、NKT細胞またはγδT細胞(gamma delta T細胞)である、請求項14に記載の分離された細胞。
- 請求項15に記載の分離された細胞を含む癌の予防用または治療用の薬学的組成物。
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JP7138989B1 (ja) * | 2020-08-04 | 2022-09-20 | セレンジーン インコーポレイテッド | メソテリンに特異的に結合する抗メソテリンキメラ抗原受容体 |
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JP2017500869A (ja) | 2013-12-19 | 2017-01-12 | ノバルティス アーゲー | ヒトメソテリンキメラ抗原受容体およびその使用 |
JP2018529327A (ja) | 2015-08-21 | 2018-10-11 | カースゲン セラピューティクス リミテッドCarsgen Therapeutics Limited | 抗メソテリン完全ヒト抗体およびメソテリンを標的とする免疫エフェクター細胞 |
JP2020519295A (ja) | 2017-05-12 | 2020-07-02 | ハープーン セラピューティクス,インク. | メソテリン結合タンパク質 |
WO2020043152A1 (en) | 2018-08-29 | 2020-03-05 | Nanjing Legend Biotech Co., Ltd. | Anti-mesothelin chimeric antigen receptor (car) constructs and uses thereof |
WO2020153605A1 (ko) | 2019-01-21 | 2020-07-30 | (주)녹십자셀 | 메소텔린 특이적인 키메라 항원 수용체 및 이를 발현하는 t 세포 |
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AU2022279862A1 (en) | 2023-06-29 |
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CA3201255C (en) | 2023-11-14 |
KR20220159915A (ko) | 2022-12-05 |
US20240033291A1 (en) | 2024-02-01 |
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