JP7466930B2 - 抗cd137抗体およびその使用 - Google Patents
抗cd137抗体およびその使用 Download PDFInfo
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Description
1つの局面において、本発明は、軽鎖可変領域VLおよび重鎖可変領域VHを有し、ここで、前記VLは、SEQ ID NO:103で表される配列と比べて、V3、A10、K44、D71およびV77からなる群から選ばれる1つまたは複数の位置で起きる1つまたは複数のVLアミノ酸突然変異を含むCD137に特異的に結合する抗体またはその抗原結合断片を提供する。
一方、本発明は、上記の抗体またはその抗原結合断片を含有可能な免疫複合体を提供する。
一方、本発明は、本発明に記載の抗体またはその抗原結合断片、本発明に記載の免疫複合体、または本発明に記載の核酸分子、本発明に記載の細胞、および任意選択で薬学的に許容可能なアジュバントを含有可能な医薬組成物を提供する。上記した薬学的に許容可能なアジュバントは、緩衝剤、酸化防止剤、防腐剤、低分子量ポリペプチド、タンパク質、親水ポリマー、アミノ酸、糖、キレート剤、対イオン、金属複合体および/又は非イオン界面活性剤などを含んでよい。本発明において、上記の医薬組成物は、経口投与、静脈内投与、筋肉内投与、腫瘍部位におけるin situ投与、吸入、直腸投与、膣内投与、経皮投与又は皮下貯蔵部による投与のために調製されることができる。
実施例1抗CD137抗体突然変異分子の構築
1.1 抗CD137抗体突然変異のデザイン
抗CD137抗体分子(C2-WT)のVHおよびVL(それぞれSEQIDNO.127および103で表される)の特定位置に、アミノ酸突然変異が導入され、そして、上記の抗体分子のscFv断片をFc断片に融合した。swiss-modelでC2-WT-Fcに対して相同モデリングを行うと共に、自由エネルギーを算出し、相同モデリングのモデルに基づき、VHとVLのFRを区別して点突然変異し、点突然変異された配列に対して自由エネルギーを算出し、同時にIMGTウェブサイト(http://www.imgt.org/)で突然変異された配列とヒト生殖細胞株の相同性を比較し、自由エネルギーとヒト生殖細胞株の相同性に基づき、すべての突然変異に対し整列を行い、その自由エネルギーおよび相同性整列に従って、安定性の一番高い分子を10個選び出して、その自由エネルギーおよび相同性の整列を図1に示す。上記の抗CD137抗体分子に対して行われる突然変異は、具体的に、表1および図1で表される。
タンパク質データベースUniprotにおけるヒトCD137のアミノ酸配列(Q07011)に基づいて、ヒトCD137の細胞外ドメインのアミノ酸配列(すなわち、Q07011における1位の残基~186位の残基)を取得し、タンパク質データベースUniprotにおけるマウス免疫グロブリンgamma(γ)1(IgG1)の定常領域アミノ酸配列(P01868)に基づいて、マウスIgG1-Fc(muFc)のドメインのアミノ酸配列(すなわち、P01868における98位の残基~324位の残基)を取得した。DNAworksオンラインツール(http://helixweb.nih.gov/dnaworks/)を用いて、対応するコード化DNA配列をデザインしてhCD137-muFc融合タンパク質の遺伝子を取得した。タンパク質データベースUniprotの情報に基づいて、強化型緑色蛍光タンパク質EGFPのアミノ酸配列(C5MKY7)を得て、DNAworksオンラインツール(http://helixweb.nih.gov/dnaworks/)を用いて、対応するコード化DNA配列をデザインしてhCD137-EGFP融合タンパク質の遺伝子を取得した。人工合成により所望のDNA断片を得て、合成された遺伝子配列を、それぞれFermentas社によるHind IIIおよびEcoR Iを利用して、産業化のベクターpcDNA4/myc-HisA(Invitrogen、V863-20)に二重酵素消化によってサブクローニングして、プラスミド構築の正確性をシーケンシングによって確認し、組換えプラスミドDNA、すなわちpcDNA4-hCD137-muFcおよびpcDNA4-hCD137-EGFPを取得した。hCD137-EGFP組換えプラスミドをHEK 293(ATCC、CRL-1573TM)細胞にトランスフェクト後48時間に、蛍光活性化セルソーティング(FACS)によりhCD137の発現を確認した。
便宜上、前述した実施例におけるC2-WT-Fc、C2-4B-Fc、C2-7A-Fc、C2-7B-Fc、C2-7BN78K-Fcは、以下の実施例における検出のために選択された。
2.1抗CD137タンパク質との結合能の検出(ELISA法):
被覆緩衝液(50mMNa2CO3, NaHCO3pH9.6)でCD137-muFcタンパク質を2μg/mlまでに希釈して、100μL/ウェルで4℃一晩した。プレートを洗浄後、3%BSA-PBS、37℃にて1時間ブロッキングした。抗CD137抗体C2-WT-Fc、C2-4A-Fc、C2-7A-FcおよびC2-7B-Fcを、それぞれ10μg/mlから、合計11つの濃度で3倍勾配希釈を施し、希釈液(1%BSA-PBS)を対照とし、37℃で2時間インキュベートした。ヤギ抗ヒトIgG-HRP(Goat anti-humanIgG- HRP conjugated)を加えて、37℃で1時間インキュベートした。可溶性単一成分TMB基質発色液を添加して、室温で光のあたらない所に5-10分間発色させた。2NH2SO4を50μL/ウェルで添加して、発色反応を停止させた。MD SpectraMax Plus384マイクロプレートリーダーに移して450nm-650nmにおけるOD値を読み取り、ソフトウェアSoft Max pro v54でデータ処理および作図解析を行い、結果が図2および表2で表される。図2で表される平均値は、次式により得られた。
実施例構築の発現hCD137-EGFPのHEK 293細胞を取り、0.5% PBS-BSA緩衝液で再懸濁させ、抗ヒトCD137のC2-WT-Fc、C2-4B-Fc、C2-7A-FcおよびC2-7B-Fcタンパク質を入れて、hIgG Fcタンパク質を陰性対照とし、氷上で20分間インキュベートした。洗浄後、eBioscience二抗anti-hIg-PEを加えて、氷上で20分間インキュベートした。洗浄後、細胞を500 μL 0.5% PBS-BSA Buffer中で再懸濁させ、フローサイトメーターにより検出した。結果は、図4に示されたように、水平座標がEGFPの発現強度を示し、鉛直座標がa-hIg-PEの強度を示す。
実験室から293T-CD137-NF-kB安定細胞株を取り、パンクレアチンを入れて2-3分間消化後、DMEM完全培地を加えて消化を停止させ、細胞を軽く吹き飛ばして、細胞懸濁液を96ウェルプレートに移して接種し、100μL/ウェルで、C2-WT-Fc、C2-4B-Fc、C2-7A-FcおよびC2-7B-Fc抗体を10μg/mLから10倍希釈し、そして、希釈された抗体およびanti-human crosslinking抗体(Jackson ImmunoResearch Laboratories:109-006-008)を96ウェルプレートに混合して添加すると共に、対照群を完全培地に加えて30時間後、溶解した細胞をルシフェラーゼ検出システム(Promega:E1501)で検出し、その結果は、図5および表4で表される。
末梢血単核細胞PBMCは、ヒトリンパ球分離溶液(Tianjin Haoyang)を用いて、密度勾配遠心分離法によって、健常人ドナーの末梢血における白血球濃厚液から分離され、RPMI完全培地に接種された。CD8+T細胞は、磁気細胞分離キット(Miltenyi Biotec:130-096-533)によって、明細書にしたがってPBMCから分離された。カウントしながらRPMI完全培地に再懸濁させ、濃度が2×106/mLになった。1μg/mLの抗-CD3および0.2μg/mLの抗-CD28により分離したCD8+T細胞を刺激することによって活性化させ、C2-7B抗体を20μg/mlから3倍希釈し、希釈された抗体およびanti-human crosslinking抗体(JacksonImmunoResearch Laboratories:109-006-008)を混合して加えて、RPMI完全培地を陰性対照とし、5日間培養後上清を取り出した。CD8+T細胞は、上清中のIL-2レベルがIL-2 ELISAアッセイキット(ebioscience)により検出され、結果は、図7で表される。結果から、抗CD137抗体C2-7B-Fcは、CD8+T細胞によるIL-2分泌の能力を向上させることができることを示した。
5.1抗CD137抗体の37℃加速安定実験純度測定
抗CD137抗体に対して、37℃で加速安定実験を行い、具体的な実験方法は、Protein Aによりシングルステップ精製された抗CD137抗体C2-WT-Fc、C2-7A-FcおよびC2-7B-FcをPBSに(pH 7.4)溶解させるとともに、2mg/mLまで濃縮し、そして、100μgの抗体を取り200μLのPCRチューブに入れて、37℃の水浴を用いて、それぞれ、0日目、7日目、14日目および21日目にサンプリングしてA280検出およびSEC-HPLC分析を行い、結果は、表7および図8で表される。
抗CD137抗体は、熱的安定性がDSCによって検出された。DSCによる試験を正しくするように、単一緩衝液とタンパク質付き緩衝液の走査結果を収集した。
SD、メス、2-3月齢のラットから、6匹のラットを選んで、3匹を1群として2群に平均に群分けた。そのラット全体にC2-7B-FcおよびC2-7BN78K-Fcタンパク質2.2mg(10mg/kg)を静脈注射し、投与後13つの時点でそれぞれ100μl採血した。ELISAの方法では、hCD137-muFcでプレートを被覆し、希釈度の適切な血清サンプルを加えて、そして、Goat anti-Human IgG HRP(Sigma CatNO:A0170)を加えて、TMBで発色させることによって血清中での標的タンパク質の濃度を検出した。C2-7B-FcまたはC2-7BN78K-Fcタンパク質を対応する群の標準タンパク質として、標準カーブを作った。WinNolinソフトウェアで薬物動態学のパラメータを算出した。平均C-Tカーブは、図13および表8で表される。検出によると、C2-7B-Fcのの半減期は170.8時間であり、C2-7BN78K-Fcは安定しており、インビボにおける半減期が平均的に173.52時間であり、両者のレベルがほぼ同一である。
腫瘍細胞が移植されたMC38およびCD137ヒト化マウス(バイオサイトジェン)腫瘍モデルを用いて、10匹を1群として4群に群分け、完全抗CD137抗体のインビボにおける効果を評価した。0日目に、1×106個のMC38細胞をCD137ヒト化マウスに皮下接種し、7日目に、用量がそれぞれ0.2mg/kg、1mg/kgおよび5mg/kgで、週に2回、合計6回で、マウスを群分けて投与し、腫瘍の形成を週に2回観察し、ノギスで腫瘍の長径および短径を計測して、腫瘍体積を算出し、腫瘍成長カーブ図を描画し、結果は、図14で表される。
Claims (12)
- 軽鎖可変領域VLおよび重鎖可変領域VHを有し、ここで、
1)前記VLはSEQ ID NO:112で表されるアミノ酸配列を有し、かつ、前記VHはSEQ ID NO:136で表されるアミノ酸配列を有し、
2)前記VLはSEQ ID NO:113で表されるアミノ酸配列を有し、かつ、前記VHはSEQ ID NO:137で表されるアミノ酸配列を有し、または
3)前記VLはSEQ ID NO:114で表されるアミノ酸配列を有し、かつ、前記VHはSEQ ID NO:138で表されるアミノ酸配列を有する、
CD137に特異的に結合することができる抗体またはその抗原結合断片。 - 前記抗原結合断片は、Fab、Fab’、F(ab)2、F(ab’)2、FvおよびscFvから選ばれる、請求項1に記載の抗体またはその抗原結合断片。
- さらに、Fcドメインを含み、ここで、前記Fcドメインが前記抗体またはその抗原結合断片のC末端に位置する、
請求項1又は2に記載の抗体またはその抗原結合断片。 - 前記Fcドメインは、SEQ ID NO:163またはSEQ ID NO:164で表されるアミノ酸配列を有する、
請求項3に記載の抗体またはその抗原結合断片。 - 1本ごとに前記軽鎖可変領域VL、前記重鎖可変領域VHおよび前記VLのC末端に位置する前記Fcドメインを含有する2本のポリペプチド鎖より構成されるホモ二量体タンパク質であり、前記ポリペプチド鎖は、SEQ ID NO. 160-162のいずれかで表されるアミノ酸配列を有する、
請求項3又は4に記載の抗体またはその抗原結合断片。 - CD137に特異的に結合する第1の結合ドメインと、CD137と異なる第2のターゲットに特異的に結合する第2の結合ドメインとを含有し、ここで、前記第1の結合ドメインは請求項1~5のいずれか1項に記載の抗体またはその抗原結合断片であり、前記第2のターゲットは腫瘍関連抗原から選ばれる、
多重特異的抗体またはその抗原結合断片。 - 請求項1~5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含む、
免疫複合体。 - 請求項1~5のいずれか1項に記載の抗体またはその抗原結合断片、あるいは請求項7に記載の免疫複合体をコードする、
単離された核酸分子。 - 請求項8に記載の核酸分子を含む、
ベクター。 - 請求項9に記載のベクターを含む、
細胞。 - 請求項1~5のいずれか1項に記載の抗体またはその抗原結合断片、請求項7に記載の免疫複合体、請求項8に記載の核酸分子、請求項9に記載のベクターおよび/または請求項10に記載の細胞、および任意選択で薬学的に許容可能なアジュバントを含む、
医薬組成物。 - がんの治療のための医薬品の調製における請求項1~5のいずれか1項に記載の抗体またはその抗原結合断片の使用、ここで、前記がんは、黒色腫、前立腺がん、結腸直腸癌、Merkel細胞皮膚がん、膵臓がん、非ホジキンリンパ腫、扁平上皮癌、乳がんの群から選ばれる。
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