JP2019525743A - 血液脳関門を通過するヒト化抗体及びその使用 - Google Patents
血液脳関門を通過するヒト化抗体及びその使用 Download PDFInfo
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Landscapes
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Abstract
Description
X1VQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWX2RQAPGKX3X4EX5VSRITWGGDNTFYSNSVKGRFTISRDNSKNTX6YLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号9)
配列中、X1=D又はE、X2=F又はV、X3=E又はG、X4=R又はL、X5=F又はW、X6=L又はVである、
を含む、単離又は精製された抗体又はその断片を提供する。
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWVRQAPGKGLEWVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号2、本明細書ではFC5−H1とも呼ばれる);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWVRQAPGKGLEWVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号3、本明細書ではFC5−H2とも呼ばれる);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGLEFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号4、本明細書ではFC5−H3とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGLEFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号5、本明細書ではFC5−H4とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号6、本明細書ではFC5−H5とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号7、本明細書ではFC5−H6とも呼ばれる);及び
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号8、本明細書ではFC5−H7とも呼ばれる)
のうちいずれか1つから選択されうる。
X1VQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWX2RQAPGKX3X4EX5VSRITWGGDNTFYSNSVKGRFTISRDNSKNTX6YLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号9)
配列中、X1=D又はE、X2=F又はV、X3=E又はG、X4=R又はL、X5=F又はW、X6=L又はVである、
を含む、単離又は精製された抗体又はその断片を提供する。
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWVRQAPGKGLEWVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号2、本明細書ではFC5−H1と呼ばれる);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWVRQAPGKGLEWVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号3、本明細書ではFC5−H2とも呼ばれる);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGLEFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号4、本明細書ではFC5−H3とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGLEFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号5、本明細書ではFC5−H4とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKGREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号6、本明細書ではFC5−H5とも呼ばれる);
DVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTVYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号7、本明細書ではFC5−H6とも呼ばれる);
EVQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWFRQAPGKEREFVSRITWGGDNTFYSNSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号8、本明細書ではFC5−H7とも呼ばれる);及び
これらと実質的に同一である配列
からなる群から選択されうる。
光学イメージング;
ポジトロン断層撮影(PET)、検出可能な薬剤は11C、13N、15O、18F、64Cu、62Cu、124I、76Br、82Rb及び68Gaなどの同位元素であり、18Fが最も臨床で利用される;
単一光子放射型コンピュータ断層撮影(SPECT)、検出可能な薬剤は、特定の用途に応じて99mTc、111In、123I、201Tl、133Xeなどの放射性トレーサーである;
磁気共鳴イメージング(MRI)、検出可能な薬剤は、例えば、以下に限定されないが、ガドリニウム、酸化鉄ナノ粒子、及び炭素コーティングされた鉄−コバルトナノ粒子とすることができ、それによりプラーク検出のためのMRIの感度が増大する;
造影超音波検査(CEUS)又は超音波、検出可能な薬剤は少なくとも1つの音響的に活性で気体が封入されたマイクロバブルである。超音波は、ヒト疾患をスクリーニング及び早期検出するための普及した技術である。超音波は、MRI又はシンチグラフィーほど高価でなく、放射線を伴わないため放射性核種イメージングなどの分子イメージングモダリティよりも安全である。
ヒトにおける潜在的な免疫原性を回避するため、ラマ由来のFC5(配列番号1)を、VHHの「ラクダ科動物」残基の突然変異によりヒト化した。ヒト化においては、CDR残基の特定にKabat付番(Kabatら、1991)を使用したことに注目すべきである。
実施例1に記載されるFC5単一ドメイン抗体(sdAb)又はそのヒト化バリアント(FC5−H1、FC5−H2、FC5−H3、FC5−H4、FC5−H5、FC5−H6、FC5−H7)を、in vitro試験用の調製においてクローニングし、形質転換し、発現させて精製した。ハイトラップキレーティング(HiTrap Chelating)(商標)カラムを使用する固定化金属アフィニティークロマトグラフィーによる精製、及び免疫化学による検出のそれぞれを可能にするため、バリアントは全てHis5及びc−mycタグとの融合物として発現させた。
実施例2で調製されたFC5 VHH及びヒト化バリアントを、融解温度分析を使用して特徴付けた。
ff=([θ]T−[θ]U)/([θ]F−[θ]U) 式I
式中、[θ]Tは任意の温度でのモル楕円率、[θ]Fは30℃で完全にフォールディングされたタンパク質のモル楕円率、[θ]Uは90℃でアンフォールディングされたタンパク質のモル楕円率。グラフ化ソフトウェアGraphPad Prism(Windows用バージョン4.02)を使用して、非線形回帰曲線フィット(Boltzmannシグモイド方程式)により、アンフォールディング曲線(フォールディング比画分、ff、対温度)の中間点として融解温度(Tm)を得た。変性への急な移行に対応する観察された変性曲線と一致する、2状態系を前提とする楕円率データに基づき、VHHの融解温度(Tm)を決定した。フォールディング比(ff)対温度のシグモイド変性曲線の中間点でTm値をとった。
抗体の細胞抗原への結合に対するヒト化の効果を評価するため、FC5及びFC5のヒト化バリアントの、SV−ARBEC細胞又はヒト脳毛細血管内皮細胞(HBEC−D3)への結合を測定した。
レーザー設定:488及び640が使用可能、6.0mW;
チャネル設定:FL−2(488〜540nm)電圧600、感度4、Tiffファイルで保存、及びFL−4(650〜690nm)電圧600、感度4、トリガー4、Tiffファイルで保存;
オブジェクト特性:FL−2(ピーク強度、平均強度、全強度、及びベースライン)及びFL−4(ピーク強度、平均強度、全強度及びベースライン);
集団定義:オブジェクト−細胞フィルター(FL−4周囲長範囲0〜500nm及びFL−2平均強度範囲0〜15000);
集団統計:オブジェクト:オブジェクト数、オブジェクト:平均値(FL−2ピーク、平均、全強度及び周囲長)及びオブジェクト:平均FL−2ベースライン。オブジェクト:中央値(FL−2ピーク、平均、及び全強度)オブジェクト:平均値(FL−4ピーク、平均、全強度及び周囲長)及びオブジェクト:平均FL−4ベースライン。オブジェクト:中央値(FL−4ピーク、平均、及び全強度)細胞:オブジェクト数、細胞:平均値(FL−2ピーク、平均、及び全強度)及び細胞:平均FL−2ベースライン。細胞:中央値(FL−2ピーク、平均、及び全強度)細胞:平均値(FL−4ピーク、平均、及び全強度)及び細胞:平均FL−4ベースライン。細胞:中央値(FL−4ピーク、平均、及び全強度)。
実施例2のヒト化FC5バリアントが血液脳関門を通過するかどうかを評価するため、in vitroアッセイを下記のように使用した。
IgG1のヒト抗体Fc断片のN末端と融合させたFC5又はFC5−H7を含む構築物を調製し、発現させ、精製した。
Fcと融合させたFC5及びFC5−H7(実施例6)の、SV−ARBEC細胞への結合について、実施例4に記載されるようにミラーボール(登録商標)High Sensitivity Microplate Cytometry(TTP Labtech)を使用して評価した。結果は、FC5−H7−Fcが、FC5−Fcと比較してわずかに改善されたSV−ARBECへの結合を有することを示している(図5A)。
本明細書及び本願の至るところで言及される、すべての特許、特許出願及び刊行物は本明細書に援用される。
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WO 95/04069
WO 2004/076670
WO 2003/046560
WO 2002/057445
WO 2011/127580
WO 2007/036021
本出願は、2017年7月6日出願の米国特許仮出願第62/358,777号の利益を主張するものであり、その内容は参照によって本明細書に組み込まれる。
Claims (14)
- 配列
X1VQLVESGGGLVQPGGSLRLSCAASGFKITHYTMGWX2RQAPGKX3X4EX5VSRITWGGDNTFYSNSVKGRFTISRDNSKNTX6YLQMNSLRAEDTAVYYCAAGSTSTATPLRVDYWGQGTLVTVSS(配列番号9)
配列中、X1=D又はE、X2=F又はV、X3=E又はG、X4=R又はL、X5=F又はW、X6=L又はVである、
を含む、単離又は精製された抗体又はその断片。 - 前記配列が、配列番号2〜8のうちいずれか1つから選択される、請求項1に記載の単離又は精製された抗体又はその断片。
- 多価ディスプレイ形式をとる、請求項1又は2に記載の単離又は精製された抗体又はその断片。
- Fc断片に連結されている、請求項3に記載の単離又は精製された抗体又はその断片。
- 前記Fc断片がマウスFc2b又はヒトFc1である、請求項4に記載の単離又は精製された抗体又はその断片。
- 前記Fcが配列番号20の配列を含む、請求項5に記載の単離又は精製された抗体又はその断片。
- 血液脳関門を通過する、請求項1〜6のいずれか一項に記載の単離又は精製された抗体又はその断片。
- 請求項1〜7のいずれか一項に記載の単離又は精製された抗体又はその断片をコードする核酸分子。
- 請求項8に記載の核酸分子を含むベクター。
- 表面に固定化されている、請求項1〜7のいずれか一項に記載の単離又は精製された抗体又はその断片。
- カーゴ分子に連結されている、請求項1〜7のいずれか一項に記載の単離又は精製された抗体又はその断片。
- 前記カーゴ分子が約1kDa〜約200kDaの範囲の分子量を有する、請求項11に記載の単離又は精製された抗体又はその断片。
- 前記カーゴ分子が、検出可能な薬剤、治療薬、薬物、ペプチド、増殖因子、サイトカイン、受容体トラップ、化合物、糖部分、酵素、抗体若しくはその断片、DNAベースの分子、ウイルスベクター、又は細胞毒性薬剤;検出可能な薬剤、治療薬、薬物、ペプチド、酵素、抗体若しくはその断片、DNAベースの分子、ウイルスベクター、又は細胞毒性薬剤を担持する1つ又は複数のリポソーム又はナノ担体;又は1つ若しくは複数のナノ粒子、ナノワイヤー、ナノチューブ、若しくは量子ドットである、請求項11又は12に記載の単離又は精製された抗体又はその断片。
- 請求項1〜7及び10〜13のいずれか一項に記載の1つ又は1つを超える単離又は精製された抗体又はその断片、並びに薬学的に許容される担体、希釈剤、又は賦形剤を含む組成物。
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