JP6893939B2 - Psma結合抗体及びその使用 - Google Patents
Psma結合抗体及びその使用 Download PDFInfo
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- JP6893939B2 JP6893939B2 JP2018556006A JP2018556006A JP6893939B2 JP 6893939 B2 JP6893939 B2 JP 6893939B2 JP 2018556006 A JP2018556006 A JP 2018556006A JP 2018556006 A JP2018556006 A JP 2018556006A JP 6893939 B2 JP6893939 B2 JP 6893939B2
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Description
(i)配列番号03に述べるCDRH1領域(GFTFSDFYMY)と、配列番号04に述べるCDRH2領域(TISDGGGYTSYPDSVKG)と、配列番号05に述べるCDRH3領域(GLWLRDALDY)とを含む、又は配列番号03、配列番号04若しくは配列番号05と少なくとも75%の配列同一性若しくは少なくとも80%の配列同一性を有するCDRH1、CDRH2若しくはCDRH3の配列を含む重鎖可変ドメインと、
(ii)配列番号06に述べるCDRL1領域(SASSSISSNYLH)と、配列番号07に述べるCDRL2領域(RTSNLAS)と、配列番号08に述べるCDRL3領域(QQGSYIPFT)とを含む、又は配列番号06、配列番号07若しくは配列番号08と少なくとも75%の配列同一性若しくは少なくとも80%の配列同一性を有するCDRL1、CDRL2若しくはCDRL3の配列を含む軽鎖可変ドメインと、
を含む、抗体分子又はその抗原結合性フラグメントに関する。
(i)本発明のPMSA結合抗体分子の重鎖可変ドメイン及び軽鎖可変ドメインを含む可変領域であって、ヒト前立腺特異的膜抗原(PSMA)に結合することができる第1の結合部位を含む、可変領域と、
(ii)第2の結合部位を含む、抗体分子の重鎖可変領域及び軽鎖可変領域と、
を含む、二重特異性抗体分子に更に関する。
アラニン(Ala)、グリシン(Gly);
アスパラギン酸(Asp)、グルタミン酸(Glu);
アスパラギン(Asn)、グルタミン(Gln);
アルギニン(Arg)、リジン(Lys);
イソロイシン(Ile)、ロイシン(Leu)、メチオニン(Met)、バリン(Val);
フェニルアラニン(Phe)、チロシン(Tyr)、トリプトファン(Trp);
セリン(Ser)、スレオニン(Thr);及び、
システイン(Cys)、メチオニン(Met)。
(i)配列番号03に述べるCDRH1領域(GFTFSDFYMY)と、配列番号04に述べるCDRH2領域(TISDGGGYTSYPDSVKG)と、配列番号05に述べるCDRH3領域(GLWLRDALDY)とを含む、又は配列番号03、配列番号04若しくは配列番号05と少なくとも75%の配列同一性若しくは少なくとも80%の配列同一性を有するCDRH1、CDRH2若しくはCDRH3の配列を含む重鎖可変ドメインと、
(ii)配列番号06に述べるCDRL1領域(SASSSISSNYLH)と、配列番号07に述べるCDRL2領域(RTSNLAS)と、配列番号08に述べるCDRL3領域(QQGSYIPFT)とを含む、又は配列番号06、配列番号07若しくは配列番号08と少なくとも75%の配列同一性若しくは少なくとも80%の配列同一性を有するCDRL1、CDRL2若しくはCDRL3の配列を含む軽鎖可変ドメインと、
を含む、抗体分子又はその抗原結合性フラグメント。
scFvフラグメントがOKT3抗体に由来する重鎖可変領域及び軽鎖可変領域を含む、項32に記載の抗体分子。
scFvフラグメントがヒト化UCHT1抗体に由来する重鎖可変領域及び軽鎖可変領域を含む、項35に記載の抗体分子。
配列番号01:ネズミ科10B3抗体の重鎖可変ドメイン(アミノ酸配列)。
配列番号02:ネズミ科10B3抗体の軽鎖可変ドメイン(アミノ酸配列)。
配列番号03:ネズミ科10B3抗体のCDRH1(アミノ酸配列)。
配列番号04:ネズミ科10B3抗体のCDRH2(アミノ酸配列)。
配列番号05:ネズミ科10B3抗体のCDRH3(アミノ酸配列)。
配列番号06:ネズミ科10B3抗体のCDRL1(アミノ酸配列)。
配列番号07:ネズミ科10B3抗体のCDRL2(アミノ酸配列)。
配列番号08:ネズミ科10B3抗体のCDRL3(アミノ酸配列)。
配列番号09:ヒト化10B3抗体の重鎖可変ドメイン(アミノ酸配列)。
配列番号10:ヒト化10B3抗体の軽鎖可変ドメイン(アミノ酸配列)。
配列番号11:ヒト化h10B3×ヒト化hUCHT1二重特異性IgGscフォーマット抗体分子の重鎖。
配列番号12:ヒト化h10B3×ネズミ科OKT3二重特異性Fabscフォーマット抗体分子の重鎖。
配列番号13:ヒト化10B3抗体のカッパー軽鎖。
配列番号14:配列番号3に対して少なくとも75%の配列同一性を有するネズミ科10B3抗体の変異CDRH1の実例(アミノ酸配列)。
配列番号15:抗体J519の重鎖の可変ドメインのアミノ酸配列。
配列番号16:抗体J519の軽鎖の可変ドメインのアミノ酸配列。
本発明を、更に以下の非限定的な実施例によって説明する。
放射線照射されたPSMAトランスフェクトSp2/0 Ag14細胞による雌性BALB/cマウスの免疫化の後、抗体10B3を作製した(ATCC(商標)CRL-1581(商標)の名称のもと商業的に入手可能なATCCからSp2/0-Ag14細胞を得た)。最後の免疫化から4日後、脾臓細胞をトランスフェクトしたSp2/0細胞と融合し、HAT選択培地で培養した。生育しているハイブリドーマ細胞の上清をPSMAトランスフェクトしたSp2/0細胞及びPSMAトランスフェクトしていないSp2/0細胞を使用するフローサイトメトリーによってPSMA抗体の産生についてスクリーニングした。限界希釈によってサブクローニングした後、安定なモノクローナルハイブリドーマ細胞株を得た。抗体産生のため、ハイブリドーマ細胞を1%FCS(ドイツ国ベルリンのBiochrom GmbH)で補足した血清低減(advanced)DMEM培地(米国02451マサチューセッツ州ウォルサムのGibco、Thermo Scientific)に適合させて精製中のウシIgGによる汚染を回避した。抗体をプロテインA親和性クロマトグラフィーによって細胞培養上清から単離し、精製した抗体のアイソタイプをIgG2b/カッパーであると同定した(Rapid Mouse-Monoclonal Isotyping Kit、21754メリーランド州イジャムズビルのBioAssay Works)。可変重鎖(配列番号1及び図10Aに示される)及び可変軽鎖(配列番号2及び図10Bに示される)の配列は、ドイツ国フライブルクのAlvedron GmbHによって決定された。
10B3抗体は、ヒト可変κ軽配列IGKV3-20*02(この配列は、アクセッション番号L37729のもとIMGT/LIGMデータベースに寄託され、またIchiyoshi Y., Zhou M., Casali P. A human anti-insulin IgG autoantibody apparently arises through clonal selection from an insulin-specific 'germ-line' natural antibody template. Analysis by V gene segment reassortment and site-directed mutagenesis' J. Immunol. 154(1):226-238 (1995)を参照されたい)及び可変重鎖配列IGHV3-11*06(この配列はアクセッション番号AF064919のもとIMGT/LIGMデータベースに寄託され、またWatson C.T., et al. Complete haplotype sequence of the human immunoglobulin heavy-chain variable, diversity, and joining genes and characterization of allelic and copy-number variation. Am. J. Hum. Genet. 92(4):530-546 (2013)を参照されたい)の生殖細胞系列配列にCDR領域を移植することによりヒト化された。IMGT/LIGM-DBは、ヒト及び他の脊椎動物種に由来する免疫グロブリン(IG)及びT細胞受容体(TR)のヌクレオチド配列のIMGT総合データベースであり、Nucleic Acids Res. 2006 (Jan 1); 34(Database issue):D781-4を参照されたい。
組み換え二重特異性抗体分子の構築のため、PSMA抗体J591及び10B3の可変ドメインを、次のの順にCD3抗体OKT3又はUCHT1のヒト定常領域及び可変領域へと融合した。Fabscフォーマット及びIgGscフォーマットの両方に対して、VL-CL。重鎖を次の通り構築した:Fabscフォーマットに対してVH-CH1-CH2mod-scFv(OKT3/UCHT1)、IgGscフォーマットに対してVH-CH1-CH2mod-CH3-scFv(OKT3/UCHT1)(図1A及び図1Bも参照されたい)。これらの抗体分子では、PMSA結合部位はFabフラグメントとして存在するが、CD3結合部位はscFvフラグメントとして存在する(図1A及び図1Bを再度参照されたい)。FcR結合、糖鎖付加部位、及びジスルフィド結合の形成を抑制するため、以下の修飾をFabscフォーマットのヒンジ領域及びCH2ドメインに導入した(EUインデックス):C226S;C229S;E233P;L234V;L235A;ΔG236;D265G;N297Q;A327Q;A330S(これに関して国際特許出願の国際公開第2013/092001号も参照されたい)。IgGscフォーマットの修飾は、IgGscフォーマットを欠くヒンジ領域中の配列位置226及び229の2つのシステイン突然変異を除いて同一であった。コンストラクトをpcDNA3.1に由来する発現ベクター(InVitrogen、Thermo Fisher)にクローニングし、国際特許出願の国際公開第2013/092001号にも記載される電気穿孔によってSp2/0細胞にトランスフェクトした。kappaSelect(Fabsc)樹脂又はプロテインA(IGGsc)樹脂を用いる親和性クロマトグラフィーによってトランスフェクトした細胞の上清から抗体分子を精製した。両方の親和性樹脂をドイツ国フライブルクのGE Health Careから購入した。
図3において、T細胞活性化を3Hチミジン取り込みによって評価した。図3Aには、比較のためオフターゲットT細胞活性化を示す。図3Cでは、活性化T細胞によるPSMA発現標的細胞の溶解を、Xelligence細胞傷害性アッセイによって実証する。3Hチミジン取り込みアッセイのため、PBMC(205個/ウェル)を96ウェルプレートに3連(triplicates)で蒔き、放射線照射した(100 Gy)PSMA発現22RV1細胞(105個/ウェル)を含んで(図3B)又はそれを含まずに(図3A)、様々な濃度の二重特異性抗体分子と共にインキュベートした。72時間後、細胞は3Hチミジン(0.5 μCi/ウェル)で更に20時間パルスされ、フィルターマット上で採取された。取り込まれた放射能を、2450 Microplate counter(Perkin Elmer)において液体シンチレーションカウンティングによって特定した。
図4A及び図4Bでは、FLT3×CD3特異性を有する抗体分子を比較する(Fabscフォーマット対bsccフォーマット)のに対し、図4C〜図4Fでは、PSMA×CD3特異性を有するそれらの抗体分子を比較する(Fabscフォーマット対IgGscフォーマット)。多量体化の挙動を分析するため使用したゲル濾過をSuperdex S200カラム上で行った。
結合(図5A)、結合競合の欠如(図5B)、及び抗体結合によるPSMA抗原のシフト(図5C)を、PSMAトランスフェクトSp2/0細胞を使用するフローサイトメトリーによって評価した。この目的のため、種々のα-PSMA抗体をこれらの細胞と共に、4℃にて30分間〜45分間、96ウェルプレートでインキュベートした。その後、細胞を洗浄し、PE複合化ヤギ-抗マウスF(ab)2フラグメント(図5A、図5C)(Jackson ImmunoResearch)、又はPE-ヤギ-抗ヒトFC-γ特異的フラグメント(Jackson ImmunoResearch)(B)と共にインキュベートした。細胞をFACSCalibur(BD Biosciences)で分析した。図5Bではヤギ抗ヒト二次抗体によって特異的に検出されるキメラ(ch)PMSA結合抗体J591は、ネズミ科(mu)抗体J591によって打ち負かされるが、ネズミ科抗体10B3、すなわち本発明の抗体によっては打ち負かされないことを実証する。抗原シフトの判定のため(図5C)、PSMA発現細胞を、実験の開始時に指定される抗体と共に、また24時間後及びFACS分析の前に再び、飽和量(10 μg/ml)の各抗体と共にインキュベートした。未処理の細胞によるPSMA発現は、参照(100%PSMA発現)としての役割を果たした。
図6A、図6Bでは、前立腺癌細胞試料を両方の抗体で染色したのに対し、図6C及び図6Dでは、扁平細胞癌試料を両方の抗体で染色した。両方の実験において、平行して、ドイツ国ベルリンのZytomed製のポリマー系(POLHRP-100)を使用して染色を行った。矢印は腫瘍間質(Tu)及び血管(Ve)を示す。10個の前立腺癌試料のうちの9個及び10個の扁平細胞癌試料のうちの7個による代表的な結果を示す。
ヒト化、CDR移植(h10B3)又はマウス(m10B3)抗体の可変ドメインのいずれかを含む、PSMA×CD3(10B3×OKT3)特異性を有する二重特異性Fabsc抗体を、PSMA発現22RV1細胞と共にインキュベートし、フローサイトメトリーによって分析した(図7)。この目的のため、細胞を4℃にて30分間〜45分間に亘り96ウェルプレートにおいて、指定の抗体と共にインキュベートした。インキュベーションに際して、細胞を洗浄し、二次PE-ヤギ-抗ヒトFC-γ特異的フラグメント(Jackson ImmunoResearch)と共にインキュベートした。細胞をFACSCalibur(BD Biosciences)で分析した。
Jurkat細胞を抗体分子(Fabsc(UCHT1)=抗体UCHT1のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むFabsc分子、IgGsc(UCHT1)=抗体UCHT1のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むIgGsc分子、Fabsc(OKT3)=抗体OKT3のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むFabsc分子、IgGsc(OKT3)=抗体OKT3のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むIgGsc分子)と共に、4℃にて30分間〜45分間、96ウェルプレートでインキュベートした。その後、細胞を洗浄し、ビオチン-ヤギ-抗ヒトIgG、F(ab’)2フラグメント特異的(Jackson ImmunoResearch)、及びストレプトアビジン-PE(Life Technologies)と共にインキュベートした。細胞をFACSCalibur(BD Biosciences)で分析した。
PSMA発現22RV1前立腺癌細胞をPBMC及び指定の二重特異性PSMA×CD3抗体分子(Fabsc(UCHT1)=抗体UCHT1のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むFabsc分子、IgGsc(UCHT1)=抗体UCHT1のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むIgGsc分子、Fabsc(OKT3)=抗体OKT3のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むFabsc分子、IgGsc(OKT3)=抗体OKT3のCD3結合可変ドメイン及び抗体J591の可変ドメインを含むIgGsc分子)と共に、PBMC:標的の比(ratio)5:1でインキュベートした。接着性標的細胞の生存率を、実施例4に記載されるXelligenceシステムを使用して評価した。標的に対するエフェクターの比(E:T)は5:1であり、抗体の濃度を5 nMに設定した。
本発明のPSMA×CD3(h10B3×UCHT1)-IgGsc(CC-1)二重特異性抗体及び対照二重特異性抗体(NG2×CD3)を、腫瘍細胞(22Rv1細胞、ヒト前立腺癌細胞;Sramkoski RM et al. In Vitro Cell Dev Biol Anim. 1999 Jul-Aug;35(7):403-9.を参照されたい)と共に又はその腫瘍細胞なしでインキュベートした。CD4及びCD8のT細胞活性化を、3日間のインキュベーションの後、細胞表面マーカーとしてCD69及びCD25を使用して、FACSによって分析した。両方のT細胞タイプは活性化され(図15A)、インターフェロンガンマレベル(図15B)及びT細胞増殖(図15C)は増加された。さらに、クロム放出アッセイ(20時間後のE:T比 10:1)及びFACS(72時間超、E:T比1:1)は、CC-1を使用する腫瘍細胞の強力な溶解を示した(図15D及び図15E)。また、本発明のCC-1による治療は、in vitroでの腫瘍増殖を阻害した。2:1のE:T比では、Xelligenceシステム(図15F左)及び顕微鏡を使用する目視検査(図15F右)によって分析されるように、CC-1の存在下で、腫瘍細胞増殖は著しく損なわれる。
次に、CC-1(本発明のIgGsc二重特異性抗体)を、マウスモデルにおけるin vivoでの抗腫瘍活性について試験した。1.5×106個の22Rv1細胞をNSG(NOD scid gamma (NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ))マウスに静脈内注射した(n=4/群)。3日後、3×106個のヒトPBMCを注射し、3日目及び5日目に10 μgのCC-1又は陰性対照としてPBSを注射した。8日後、FACSを使用して肺における転移形成を分析した。形成された転移の数の著しい減少が、CC-1治療群で見られた(図16A)。その後、NSGマウス(n=3/群)にマウス1匹当たり2×107個のPBMCを注射し、4日間の間隔で2×20 μgで「最大投与量以上の(supratherapeutic)」CC-1用量、及び対照抗体(T細胞を非特異的に活性化する、陽性対照としてのUCHT1)又は陰性対照としてのPBSで治療した。自己免疫活性のマーカーとしてのIFNガンマ放出及び体重を分析した(図16B)。UCHT1と比較してCC-1はIFNガンマ産生を誘導せず、UCHT1治療群とは対照的に、CC-1治療マウスの体重の減少は観察されなかった。別の実験では、NOS/SCIDマウスに22Rv1細胞(PSMA陽性(positive)腫瘍細胞)又はDU145細胞(PSMA陰性ヒト前立腺腫瘍細胞)を注射し、そして35日後の腫瘍の定着(establishment)の後、マウスを放射性同位元素で標識したCC-1抗体(50 μCi)で治療し、24時間後に屠殺して、種々の臓器で放射能を測定した。22Rv1治療マウスの腫瘍においてのみ、放射能の著しい増加を観察することができた(図16C)。BiTE又は本発明のIgGscのフォーマットの二重特異性抗体の血清半減期の差を試験するため、CC-1(IgGscフォーマット)又はBiTEフォーマットのいずれかの二重特異性PSMA×CD3抗体50μgをBalb/Cマウスに注射した。血清濃度を経時的に測定した。BiTEフォーマットの二重特異性抗体は注射から2時間〜4時間後に検出できなかったのに対し、CC-1は注射から24時間後であっても検出可能であった(図16D)。したがって、本発明のIgGscフォーマットは、他の二重特異性抗体フォーマットと比較して、血清安定性の増加を提供する。
IgGsc二重特異性抗体フォーマット(上記を参照されたい)のCD3結合部位としてOKT3に対するUCHT1の本明細書に示される優越性(supremacy)を更に解明するため、両方の単一特異性抗体のFab型及びIgG型を比較して試験した。OKT3及びUCHT1をプロテインA親和性クロマトグラフィーによって精製した。Fabフラグメントを、以前に記載される(Jung et al. Target cell induced T cell activation with bi- and trispecific antibody fragments. Eur J Immunol 1991; 21,2431-2435)通り、ペプシン消化に続くヒンジ領域ジスルフィド結合の還元及び修飾によって作製した。Fabフラグメントを、Superdex S200カラム上のサイズ排除クロマトグラフィーによって精製した。
二価の無傷のIgG分子ではなく一価のFabフラグメントとして使用される場合、OKT3は結合活性を失う(loses)。対照的に、UCHT1フラグメントの結合活性は変わらない。理論に拘束されるものではないが、これは無傷のUCHT1抗体の一価の結合を指し、その結合活性は二価で結合するOKT3抗体に匹敵する。UCHT1を支持する一価のFabフラグメントの結合の著しい差は、Fabscフォーマット内の2つの抗体の結合における対応する差を説明する(図8、実施例9)。このフォーマットでは、抗体は、標的抗体のC末端に付着した一価の単鎖分子として存在する(図1)。また、UCHT1の一価の結合は、FabscフォーマットではなくIgGscフォーマット内に存在する場合に、OKT3が結合活性を得るのに対して、なぜこの抗体が結合活性を失う(loses)のかを説明する(図1及び図8、実施例9)。
IgGscに基づく抗体フォーマットの抗CD3抗体としてのUCHT1の好ましい使用を、他の非PSMA特異抗体について更に試験した。この抗原のO-アセチル化形態(oaGD2)と同様に、ガングリオシドGD2を発現する放射線照射したM21メラノーマ細胞を、健常なヒトドナーの末梢血から単離した末梢血単核細胞(PBMC)及び指定の特異性を有する二重特異性IgGsc抗体と共にインキュベートした。これらのコンストラクト内に使用される親単一特異性抗体は、それぞれhu14.18(抗GD2)、8B6(抗oaGD2)、J591(抗PSMA)、及びUCHT1(抗CD3)であった。3日後、3Hチミジン取込みアッセイを使用してT細胞活性化を評価した(assessed)。さらに、M21細胞をPBMC及び指定の二重特異性IgGsc抗体(50 nM)とインキュベートした。その後、Xelligenceシステムを使用して腫瘍細胞の増殖をモニターした。無関係な標的特異性(MOPC)を有する二重特異性IgGsc抗体を対照として使用した。
GD2及びoaGD2を発現する腫瘍細胞、及びこれらの抗原を標的とする二重特異性抗体の存在下で、PBMC集団内のT細胞の有効な活性化が観察された。M21がPSMAを発現しないことから、対照抗体ターゲッティングPSMAは効果がなかった(図17A)。
図1
Cystein depleted システイン枯渇
Fc-attenuated Fc減衰
CH2 domain CH2ドメイン
図2
CD69 expression [%] CD69発現[%]
without antibody 抗体なし
CD3 antibody CD3抗体
図3
without target cells 標的細胞なし
target cells 標的細胞
Cell death, 22RV1 cells+PBMC 細胞死、22RV1細胞+PBMC
normalized cell index 正規化した細胞指標
PBMC only PBMCのみ
Time [h] 時間[時間]
図4
Elution volume [ml] 溶出容量[ml]
Retention time [min] 保持時間[分]
Molecular weight standard 分子量スタンダード
図5A
Binding 結合
図5B
Competition of binding 結合の競合
(median) (中央値)
図5C
Antigen shift 抗原シフト
shift PSMA シフトPSMA
図6
A: Prostate Ca, PSMA antibody J591 A:前立腺癌、PSMA抗体J591
B: Prostate Ca, PSMA antibody 10B3 B:前立腺癌、PSMA抗体10B3
C: Squamous cell Ca, PSMA antibody J591 C:扁平細胞癌、PSMA抗体J591
D: Squamous cell Ca, PSMA antibody 10B3 D:扁平細胞癌、PSMA抗体10B3
図8
Binding to Jurkat cells (CD3+) Jurkat細胞(CD3+)への結合
Median fluorescence intensity 中央値蛍光強度
PSMA (J591) X CD3 concentration (nM) PSMA(J591)×CD3濃度(nM)
図9
Cell Index 細胞指標
Time (Hour) 時間(時間)
図10A
PSMA (m10B3) murine HC variable region PSMA(m10B3)ネズミ科HC可変領域
(SEQ ID NO:01) (配列番号01)
図10B
PSMA (m10B3) murine LC variable region PSMA(m10B3)ネズミ科LC可変領域
(SEQ ID NO:02) (配列番号02)
図10C
PSMA (h10B3) humanized HC variable region PSMA(h10B3)ヒト化HC可変領域
(SEQ ID NO:09) (配列番号09)
図10D
PSMA (h10B3) humanized LC variable region PSMA(h10B3)ヒト化LC可変領域
(SEQ ID NO:10) (配列番号10)
図11
IgGsc_PSMA(h10B3)_CD3(hUCHT1) Heavy chain IgGsc_PSMA (h10B3)_CD3 (hUCHT1)重鎖
Ig Leader peptide Igリーダーペプチド
Humanized PSMA (10B3) HC variable region ヒト化PSMA(10B3)HC可変領域
IgG1 CH1 domain IgG1 CH1ドメイン
IgG1 hinge region IgG1ヒンジ領域
Mutated IgG1 CH2 domain 変異IgG1 CH2ドメイン
IgG1 CH3 domain IgG1 CH3ドメイン
Humanized CD3 single chain (UCHT1) LC variable region ヒト化CD3単鎖(UCHT1)LC可変領域
Linker region リンカー領域
Humanized CD3 single chain (UCHT1) HC variable region ヒト化CD3単鎖(UCHT1)HC領域
(SEQ ID NO: 11) (配列番号11)
図12
S6:Fabsc_PSMA (h10B3)_mCD3(OKT3) Heavy chain S6:Fabsc_PSMA(h10B3)_mCD3(OKT3)重鎖
Ig Leader peptide Igリーダーペプチド
Humanized PSMA (10B3) HC variable region ヒト化PSMA(10B3)HC可変領域
IgG1 CH1 domain IgG1 CH1ドメイン
IgG1 hinge region IgG1ヒンジ領域
Mutated IgG1 CH2 domain 変異IgG1 CH2ドメイン
Beginning of IgG1 CH3 domain IgG1 CH3ドメインの開始
CD3 single chain (OKT3) HC variable region CD3単鎖(OKT3)HC可変領域
Linker region リンカー領域
CD3 single chain OKT3 LC variable region CD3単鎖OKT3 LC可変領域
(SEQ ID NO: 12) (配列番号12)
図13
PSMA (h10B3)_Kappa_Light chain PSMA(h10B3)_カッパー_軽鎖
Ig Leader peptide Igリーダーペプチド
Humanized PSMA (10B3) LC variable region ヒト化PSMA(10B3)LC可変領域
C-Kappa C-カッパー
(SEQ ID NO: 13) (配列番号13)
図14A
mPSMA (J591) HC variable region mPSMA(J591)HC可変領域
(SEQ ID NO: 15) (配列番号15)
図14B
mPSMA (J591) LC variable region mPSMA(J591)LC可変領域
(SEQ ID NO: 16) (配列番号16)
図15
CD69+ T Cells [%] CD69+ T細胞[%]
CD25+ T Cells [%] CD25+ T細胞[%]
Control 対照
PBMC alone PBMC単独
Without Targe cells 標的(Target)細胞を含まない
with Target cells 標的細胞を含む
3H-Thymidine Incorporation [103 cpm] 3H-チミジン取り込み[103 cpm]
Specific lysis [%] 特異的溶解[%]
Antibody concentration [μg/ml] 抗体濃度[μg/ml]
Living tumor cells 生存腫瘍細胞
Tumor cell growth 腫瘍細胞増殖
Un-treated 未処理 Time [h] 時間[時間]
図16
Pulmonary foci/mouse 肺病巣/マウス
control 対照
Un-treated 未処理
Body weight [%] 体重[%]
Days after injection 注射後の日数
Blood 血液
Tumor 22Rv1 (PSMA+) 腫瘍22Rv1(PSMA+)
Tumor DU145 (PSMA-) 腫瘍DU145(PSMA-)
Heart 心臓
Lung 肺
Liver 肝臓
Right kidney 右腎臓
Left kidney 左腎臓
Spleen 脾臓
Right muscle 右の筋肉
Antibody concentration [μg/ml] 抗体濃度[μg/ml]
Time [h] 時間[時間]
図17
[3H]-incorporation (cpm) [3H]取り込み(cpm)
Antibody concentration [nM] 抗体濃度[nM]
Cell index 細胞指標
Time (Hour) 時間(時間)
Claims (14)
- ヒト前立腺特異的膜抗原(PSMA)に結合することができる抗体分子又はその抗原結合性フラグメントであって、
(i)配列番号03に示されるCDRH1領域(GFTFSDFYMY)と、配列番号04に示されるCDRH2領域(TISDGGGYTSYPDSVKG)と、配列番号05に示されるCDRH3領域(GLWLRDALDY)とを含む、重鎖可変ドメインと、及び
(ii)配列番号06に示されるCDRL1領域(SASSSISSNYLH)と、配列番号07に示されるCDRL2領域(RTSNLAS)と、配列番号8に示されるCDRL3領域(QQGSYIPFT)とを含む、軽鎖可変ドメインと、
を含む、抗体分子又はその抗原結合性フラグメント。 - 前記重鎖可変領域が、配列番号01若しくは配列番号09に示されるアミノ酸配列に対して少なくとも90%の配列同一性を有するアミノ酸配列を含む、又は、
前記軽鎖可変領域が、配列番号02若しくは配列番号10に示されるアミノ酸配列に対して少なくとも90%の配列同一性を有するアミノ酸配列を含む、請求項1に記載の抗体分子又はその抗原結合性フラグメント。 - 前記抗体分子若しくはその抗原結合性フラグメントがヒトPSMAへのJ591の結合と競合しない、又は、
前記抗体分子若しくはその抗原結合性フラグメントがPSMAに結合する場合にJ591よりも抗原シフトの誘導が減少される、又は、
前記抗体分子若しくはその抗原結合性フラグメントが扁平細胞癌(SCC)の細胞に更に結合する、請求項1又は2に記載の抗体分子又はその抗原結合性フラグメント。 - (i)請求項1〜3のいずれか一項に定義される重鎖可変ドメイン及び軽鎖可変ドメインを含む可変領域であって、ヒト前立腺特異的膜抗原(PSMA)に結合することができる第1の結合部位を含む、可変領域と、
(ii)第2の結合部位を含む、抗体分子の重鎖可変領域及び軽鎖可変領域と、
を含む、二重特異性抗体分子。 - 前記第1の結合部位又は第2の結合部位が、T細胞又はナチュラルキラー(NK)細胞特異的な受容体分子に結合し、前記T細胞又はNK細胞特異的な受容分子が好ましくはCD3である、請求項4に記載の抗体分子。
- 第2の結合部位を含む、抗体分子の前記重鎖可変領域及び軽鎖可変領域が、OKT3又はUCHT1の重鎖可変領域及び軽鎖可変領域である、請求項5に記載の抗体分子。
- (i)前記第1の結合部位がFabフラグメントに含まれ、前記第2の結合部位がscFvフラグメントに含まれ、又は、
(ii)前記第1の結合部位が単鎖Fvフラグメントに含まれ、第2の結合部位がFabフラグメントに含まれ、
前記Fabフラグメント及び単鎖Fvフラグメントが、CH2ドメイン及び/又はCH3ドメインを介して連結される、請求項4〜6のいずれか一項に記載の抗体分子。 - Fc受容体への結合を媒介することができる前記CH2ドメインの少なくとも1個のアミノ酸残基が欠損又は変異導入されている、請求項7に記載の抗体分子。
- Fabフラグメントと、CH2ドメインと、scFvフラグメントとを含み、
前記Fabフラグメントがヒンジ領域を含み、
前記Fabフラグメントがヒト化10B3抗体のFabフラグメントであり、及び/又は、
前記scFvフラグメントがOKT3抗体に由来する重鎖可変領域及び軽鎖可変領域を含み、
前記抗体分子の重鎖が配列番号12に示される配列を有し、及び/又は、
前記抗体分子の軽鎖が配列番号13に示される配列を有する、
請求項7又は8に記載の抗体分子。 - Fabフラグメントと、CH2ドメインと、CH3ドメインと、scFvフラグメントとを含み、
前記Fabフラグメントがヒンジ領域を含み、
前記Fabフラグメントがヒト化10B3抗体のFabフラグメントであり、及び/又は、
前記scFvフラグメントがヒト化UCHT1抗体に由来する重鎖可変領域及び軽鎖可変領域を含み、
前記抗体分子の重鎖が配列番号11に示される配列を有する、及び/又は、
前記抗体分子の軽鎖が配列番号13に示される配列を有する、
請求項7又は8に記載の抗体分子。 - 前記抗体分子が四量体抗体分子、又はホモ二量体四価の抗体分子である、請求項10に記載の抗体分子。
- 請求項1〜11のいずれか一項に定義される抗体分子又はその抗体結合性フラグメントを含む、医薬組成物。
- 疾患の診断又は治療における使用のための、請求項1〜11のいずれか一項に記載の抗体分子又はその抗原結合性フラグメント又は請求項12に記載の医薬組成物であって、前記疾患が癌であり、前記癌が、前立腺癌、結腸直腸癌、胃癌、肺癌、骨肉腫、乳癌、膵臓癌、又は扁平細胞癌である、請求項1〜11のいずれか一項に記載の抗体分子又は抗原結合性フラグメント又は請求項12に記載の医薬組成物。
- ヒト前立腺特異的膜抗原(PSMA)を検出するin vitro方法であって、
被験体から得られた試料と、請求項1〜11のいずれか一項に記載の抗体分子又はその抗原結合性フラグメント又は請求項12に記載の医薬組成物とをin vitroで接触させることを含む、方法。
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