JP7510518B2 - 抗c-Met抗体薬物複合体及びその応用 - Google Patents
抗c-Met抗体薬物複合体及びその応用 Download PDFInfo
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- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
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Description
(1)重鎖可変領域が、配列番号7に示される配列、或いは配列番号7と同じCDR1~3を有し、かつ配列番号7と比較して同一性が80%、85%、90%、95%、96%、97%、98%又は99%を超える配列を有し、かつ/又は
(2)軽鎖可変領域が、配列番号8に示される配列、或いは配列番号8と同じCDR1~3を有し、かつ配列番号8と比較して同一性が80%、85%、90%、95%、96%、97%、98%又は99%を超える配列を有する、c-Metを標的とするヒト化抗体又はその抗原結合断片を提供する。
別段の定義がない限り、本明細書で使用されるすべての技術用語及び科学用語は、当業者によって理解されるものと同じ意味を有する。この分野の定義と用語については、当業者がCurrent Protocols in Molecular Biology(Ausubel)を具体的に参照すればよい。アミノ酸残基の略語は、当分野で用いられている、20個の慣用のL-アミノ酸を表す標準的な3文字及び/又は1文字コードの1つを指す。
[具体的な実施例]
c-Metマウス抗体mAAJ8D6に基づいて、様々なキメラ抗体及びヒト化抗体をさらに設計し、親和力を比較し、そして、候補のキラメc-Met抗体c AAJ8D6及びヒト化抗体AAJ8D6を決定した。
キラメcAAJ8D6及びヒト化抗体AAJ8D6の親和力をELISA法で測定した。96ウェルプレートを可溶性EDタンパク質で被覆した後、希釈した抗体とともにインキュベートした。ただし、ED関連抗体は、HRPを結合したヤギF(ab’)2抗-ヒトIgG Fc-特異的二次抗体で検出した。GraphPaD Prismソフトウェアを使用して、XをlogXに変換し、用量反応曲線を使用してフィッティングした。フィッティングして得られた曲線を図1に示す。
c-Metタンパク質を最終濃度2μg/mlになるように希釈して調製し、1ウェルあたり100μlでマイクロプレートに加え、4℃で一晩置いた。ウェル中の溶液を廃棄し、PBSTで3回洗浄した。ブロッキング液を300μl/ウェルで加え、37℃で2時間インキュベートした。ウェル中の溶液を廃棄し、PBSTで3回洗浄した。AAJ8D6抗体及びABT-700(即ち、テリソツズマブとしても知られるtelisotuzumabであり、その配列情報についてhttps://extranet.who.int/soinn/mod/page/view.php?id=137&inn_n=10366を参照されたい。以下でも同じである。)を9個の濃度ポイントに希釈し、96ウェルプレートに加え、2時間インキュベートした。ウェル中の溶液を廃棄し、PBSTで3回洗浄した。希釈液を、希釈度を1:5000として、1ウェルあたり100μlで加え、37℃で1時間インキュベーし、HRP検出抗体を調製した。ウェル中の溶液を廃棄し、PBSTで3回洗浄した。TMB発色液を加えて室温で2分間インキュベートした後、Elisa停止液を加え、リーダーに載せてデータを得た。結果を表4及び図2に示す。
抗体薬物複合体の調製としては、一般的な結合方法を使用した。精製水で還元剤及び保護剤をそれぞれ次のように調製した。1~20mMのTCEP(Tris-2-carboxyethyl-phosphine)、1~20mMのDTPA(Diethylene triamine pentacetate acid)を母液として、必要な複合体化率に応じて一定の濃度範囲内の量で還元剤を添加し、TCEPと抗体との最終濃度のモル比が0.5~6.0:1となるように、一定の体積比(1:1)で一定の濃度のモノクローナル抗体(例えば:5~30mg/mL)を混合し、25℃で1時間攪拌反応させた。TCEPで還元された抗体をそのままに複合体化に使用した。
HT29細胞をウェルあたり約1×105個の細胞で6ウェルプレートに再懸濁した。AAJ8D6抗体、AAJ8D6-Mc-Val-Cit-MMAE、AAJ8D6-PY-Val-Cit-MMAE、AAJ8D6-D07-Val-Cit-MMAEをそれぞれpHAbアミン反応性染料に抱合した後、細胞培養培地で10μg/mlに希釈した。100μlのAAJ8D6抗体、AAJ8D6-Mc-Val-Cit-MMAE、AAJ8D6-PY-Val-Cit-MMAE、AAJ8D6-D07-Val-Cit-MMAEの染料複合体を細胞に加え、所定時間(0時間、1時間、3時間、5時間、21時間和24時間)で37℃でインキュベートした。AAJ8D6抗体、AAJ8D6-Mc-Val-Cit-MMAE、AAJ8D6-PY-Val-Cit-MMAE、AAJ8D6-D07-Val-Cit-MMAEのエンドサイトーシス効果をフローサイトメトリーにより測定した。24時間後、サンプルがHT29細胞に明らかにエンドサイトーシスされた。3時間後、エンドサイトーシス効果が90%程度になった。それから、本発明で提供されるヒト化抗体及び調製されたADは、良好なエンドサイトーシス効果を有し、薬物を標的細胞に効率的に送達することができたことが分かった。結果を図3に示す。
対数増殖期でのc-Met発現程度の異なる細胞MKN-45、SNU-620、HT29、BXPC-3を96ウェルプレートにそれぞれ接種した。37℃、5%CO2インキュベーターで一晩インキュベートした。AAJ8D6、AAJ8D6-Mc-Val-Cit-MMAE、IgG1-Mc-Val-Cit-PABを完全培地で濃度1.25~2000ng/mLに調製し、MMAEを完全培地で濃度0.0021~80ng/mLに調製し、100μLでウェルに加え、濃度ごとに3つの重複ウェルを設定し、同時にブランク対照群を設定した。72±2hの薬物作用の後、CCK-8試薬を加え、37℃、5%CO2インキュベーターで1~4時間インキュベートし、マイクロプレートリーダーの450nmで各ウェルのOD値を検出した。阻害率をIR%=(ODブランク-OD薬物)×100/ODブランクとして算出した。阻害率及び薬物濃度に対して4パラメータフィッティングを行い、IC50を算出した。
ヒト結腸がん細胞HT29の細胞株懸濁液を100μL/ウェル、5000個/ウェルの密度で96ウェルプレートに加え、水で飽和した37℃のCO2インキュベーターで一晩培養した。抗体薬物複合体AAJ8D6-Mc-Val-Cit-MMAE及び抗体薬物複合体ABT-700-Mc-Val-Cit-MMAEを段階希釈して細胞を含む96ウェルプレートに100μL/ウェルで加えた。37℃インキュベーターで72時間培養を続けた。マイクロプレートリーダーで450nmでのOD値を読み取った。阻害率の計算式は:IR%=(ODブランク-OD薬物)×100/ODブランクであった。カーブフィッティングソフトウェアSoftmax Pro7.0.3 GxpによりIC50値を算出した。
6~7週齢の42匹のBalb/cヌードマウスを採用し、0.1mLのMKN-45細胞懸濁液(2.4×106cells/匹)をマウスの右脇の後方に皮下植入し、腫瘍が約100~300mm3に成長したら、腫瘍体積に応じてVehicle(PBS)群、IgG1-Mc-Val-Cit-PAB(3mg/kg)群、抗体薬物複合体AAJ8D6-Mc-Val-Cit-MMAE(0.75mg/kg)群、抗体薬物複合体AAJ8D6-Mc-Val-Cit-MMAE(1.5mg/kg)群、抗体薬物複合体AAJ8D6-Mc-Val-Cit-MMAE(3mg/kg)、ヒト化抗体AAJ8D6(3mg/kg)群にランダムにグループ分け、各群に6匹の担癌マウスで、各群に週1回、計3回静脈内投与し、投与期間中、腫瘍の長径、短径及び体重を週2回測定した。投与21日目に腫瘍阻害率(TGIRTV)を算出して有効性評価を行った。
腫瘍体積:TV=D1×D22/2、ここで、D1、D2はそれぞれ腫瘍の長径と、腫瘍の短径を表す。
マウス胃癌GA0046のPDXモデル(即ち、ヒト由来の組織異種移植片、patient-derivedxenografts)は、ヒト胃癌患者の腫瘍組織を重度の免疫不全マウスに移植することにより構築され、胃癌組織はマウス体内で成長して移植腫瘍を形成した。
腫瘍体積:TV=D1×D22/2、ここで、D1、D2はそれぞれ腫瘍の長径と、腫瘍の短径を表す。
マウス肺癌LU2503のPDXモデル(即ち、ヒト由来の組織異種移植片、patient-derivedxenografts)は、ヒト肺癌患者の腫瘍組織を重度の免疫不全マウスに移植することにより構築され、肺癌組織はマウス体内で成長して移植腫瘍を形成した。
腫瘍体積:TV=D1×D22/2、ここで、D1、D2はそれぞれ腫瘍の長径と、腫瘍の短径を表す。
Claims (36)
- 重鎖可変領域と軽鎖可変領域とを含むヒト化抗体又はその抗原結合断片であって、
(1)重鎖可変領域が、Kabatによって定義される配列番号1~3に記載のCDR1~3を有し、かつ
(2)軽鎖可変領域が、Kabatによって定義される配列番号4~6に記載のCDR1~3を有する、ことを特徴とするc-Metを標的とするヒト化抗体又はその抗原結合断片。 - 前記ヒト化抗体又はその抗原結合断片が、モノクローナル抗体、二重特異性抗体、多重特異性抗体、Fab断片、F(ab’)断片、F(ab’)2断片、Fv断片、および単鎖抗体(scFv)からなる群より選択される、ことを特徴とする請求項1に記載の抗体又はその抗原結合断片。
- 前記抗体又はその抗原結合断片が、IgG1、IgG2、IgG3、IgG4から選択された免疫グロブリンの定常領域をさらに含む、ことを特徴とする請求項1に記載の抗体又はその抗原結合断片。
- (1)重鎖可変領域のアミノ酸配列が配列番号7に示され、かつ
(2)軽鎖可変領域のアミノ酸配列が配列番号8に示される、請求項1に記載の抗体又はその抗原結合断片。 - 前記c-Metを標的とするヒト化抗体の重鎖及び軽鎖は、それぞれ、
(1)重鎖のアミノ酸配列が配列番号9に示され、かつ
(2)軽鎖のアミノ酸配列が配列番号10に示される、ことを特徴とする請求項4に記載の抗体又はその抗原結合断片。 - 請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片をコードする、ことを特徴とする単離されたポリヌクレオチド。
- 請求項6に記載のポリヌクレオチドを含む、ことを特徴とする核酸構築物。
- 前記核酸構築物が発現ベクターであって、前記ポリヌクレオチドが、それによってコードされるポリペプチドの宿主細胞又は無細胞発現系における発現を可能にする調節配列に作動可能に連結されている、ことを特徴とする請求項7に記載の核酸構築物。
- 請求項6に記載のポリヌクレオチドまたは請求項7に記載の核酸構築物を含むことを特徴とする宿主細胞。
- 原核細胞、真核細胞、酵母細胞、哺乳動物の細胞、大腸菌細胞からなる群より選択されることを特徴とする請求項9に記載の宿主細胞。
- 前記宿主細胞がCHO細胞、NS0細胞、Sp2/0細胞およびBHK細胞から選択されることを特徴とする請求項9に記載の宿主細胞。
- 請求項8に記載の核酸構築物の発現を可能にする条件下で請求項9~11のいずれか1項に記載の宿主細胞を培養する工程と、
生成された発現タンパク質を培養物から回収する工程とを含む、ことを特徴とする請求項1~5のいずれか一項に記載の抗体又はその抗原結合断片の製造方法。 - c-Metを標的とする抗体薬物複合体であって、1個又は複数個の治療剤と複合体化された請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片を含む、ことを特徴とする抗体薬物複合体。
- 前記治療剤が、細胞毒性分子、免疫増強剤、及び放射線性同位体から選択され、
前記細胞毒性分子が、チューブリン阻害剤およびDNA損傷剤からなる群より選択される、ことを特徴とする請求項13に記載の抗体薬物複合体。 - 前記チューブリン阻害剤が、ドラスタチン(dolastatin)系細胞毒性分子、アウリスタチン(auristatin)系細胞毒性分子及びマイタンシン(maytansine)系細胞毒性分子からなる群より選択され、前記DNA損傷剤が、カリケアマイシン(calicheamicin)系、デュオカルマイシン(duocarmycin)系、PBD、カンプトテシン(camptothecins)、SN-38、Dxdからなる群より選択される、ことを特徴とする請求項14に記載の抗体薬物複合体。
- 前記アウリスタチン系細胞毒性分子がMMAEおよびMMAFからなる群より選択され、および/または前記マイタンシン系細胞毒性分子がDM1およびDM4からなる群より選択される、ことを特徴とする請求項15に記載の抗体薬物複合体。
- 前記抗体薬物複合体が一般構造式:A-(L-U)n(ただし、Aは請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片を表し、Uは活性薬物単位であり、Lは前記A及び前記Uにそれぞれ共有結合されている任意の連結基であり、nは1、2、3、4、5、6、7又は8から選択される整数であり、前記Aは、1個又は複数個の前記Lを介して1個、2個、3個、4個、5個、6個、7個、8個の前記Uを連結している。)を有する、ことを特徴とする請求項14に記載の抗体薬物複合体。
- 前記Lが、前記A上のアミノ残基又はスルフヒドリル残基に共有結合されている、ことを特徴とする請求項17に記載の抗体薬物複合体。
- 前記Lが、前記A上のスルフヒドリル残基に共有結合されている、ことを特徴とする請求項18に記載の抗体薬物複合体。
- 前記Lが、前記A上の鎖間ジスルフィド結合が開かれた後に形成されたスルフヒドリル残基に共有結合されている、ことを特徴とする請求項19に記載の抗体薬物複合体。
- 前記Lには、切断可能なリンカー及び切断不可能なリンカーが含まれる、ことを特徴とする請求項18に記載の抗体薬物複合体。
- 前記切断可能なリンカーが、ペプチド単位を含み、
前記ペプチド単位は、2~20個のアミノ酸を含む、ことを特徴とする請求項21に記載の抗体薬物複合体。 - 前記切断可能なリンカーが、-バリン-シトルリン-(-Val-Cit-)、-グリシン-グリシン-フェニルアラニン-グリシン-(-Gly-Gly-Phe-Gly-)、-バリン-アラニン-(-Val-Ala-)、-バリン-リジン-(-Val-Lys-)、-バリン-アルギニン-(-Val-Arg-)、-フェニルアラニン-シトルリン-(-Phe-Cit-)、-フェニルアラニン-リジン-(-Phe-Lys-)、-フェニルアラニン-アルギニン-(-Phe-Arg-)及びそれらの組み合わせから選択されるペプチド単位である、請求項21に記載の抗体薬物複合体。
- 請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片及び/又は請求項13~26のいずれか1項に記載の抗体薬物複合体と、薬学的に許容される担体とを含む、医薬組成物。
- がんを治療又は予防するための薬物の調製における、請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片、請求項6に記載のポリヌクレオチド、請求項7又は8に記載の核酸構築物、請求項13~26のいずれか1項に記載の抗体薬物複合体、或いは請求項27に記載の医薬組成物の、使用。
- 前記がんがc-Met陽性がん又は固形腫瘍である、請求項28に記載の使用。
- 前記c-Met陽性がんが肺癌又は胃癌である、請求項29に記載の使用。
- 請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片、および/または請求項13~26のいずれか1項に記載の抗体薬物複合体を含む、疾患の治療に使用するための医薬組成物であって、
前記疾患は、c-Met陽性がんである、医薬組成物。 - 当該疾患が肺癌又は胃癌である、請求項31に記載の医薬組成物。
- 容器と、
前記容器に入れられた、請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片、或いは請求項13~26のいずれか1項に記載の抗体薬物複合体又はその薬学的に許容される塩又は溶媒和物、或いは請求項27に記載の医薬組成物を含む製剤と、
任意選択的な使用説明書とを含むキット。 - 請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片を含む、ことを特徴とする組換えタンパク質。
- 前記組換えタンパク質が、二重特異性抗体又は多重特異性抗体である、請求項34に記載の組換えタンパク質。
- 組換えタンパク質の調製における請求項1~5のいずれか1項に記載の抗体又はその抗原結合断片の使用。
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WO2024131949A1 (zh) * | 2022-12-23 | 2024-06-27 | 苏州宜联生物医药有限公司 | Anti-cMet抗体、抗体药物偶联物及其制备方法和用途 |
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