JP6300373B2 - 抗バソヒビン2抗体 - Google Patents
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- JP6300373B2 JP6300373B2 JP2014513846A JP2014513846A JP6300373B2 JP 6300373 B2 JP6300373 B2 JP 6300373B2 JP 2014513846 A JP2014513846 A JP 2014513846A JP 2014513846 A JP2014513846 A JP 2014513846A JP 6300373 B2 JP6300373 B2 JP 6300373B2
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Classifications
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- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/22—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against growth factors ; against growth regulators
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/10—Cells modified by introduction of foreign genetic material
- C12N5/12—Fused cells, e.g. hybridomas
- C12N5/16—Animal cells
- C12N5/163—Animal cells one of the fusion partners being a B or a T lymphocyte
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- G—PHYSICS
- G01—MEASURING; TESTING
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Description
〔1〕 配列番号2に示されるアミノ酸配列のアミノ酸番号269〜288を認識する、抗バソヒビン2抗体又はその抗原結合断片であって、該抗バソヒビン2抗体が、受託番号NITE BP−1474で示されるハイブリドーマにより産生されるモノクローナル抗体である、抗体又はその抗原結合断片。
〔2〕 配列番号2に示されるアミノ酸配列のアミノ酸番号269〜288を認識する抗バソヒビン2モノクローナル抗体を産生する、受託番号NITE BP−1474で示されるハイブリドーマ。
〔3〕 前記〔1〕記載の抗体又はその抗原結合断片を含有してなる、血管新生抑制剤。
〔4〕 前記〔1〕記載の抗体又はその抗原結合断片を含有してなる、医薬組成物。
〔5〕 前記〔3〕記載の血管新生抑制剤を含有してなる、血管新生の抑制を要する疾患の治療用医薬組成物。
〔6〕 工程(A):抗血管新生薬の候補化合物の投与後における被検個体由来の生体試料と、前記〔1〕記載の抗体又はその抗原結合断片とを接触させて複合体を形成させて、該複合体の存在量を測定する工程
工程(B):前記工程(A)で測定された存在量を、投与前における存在量と比較する工程、ならびに
工程(C):前記工程(B)で行った比較において、該候補化合物の投与前に比べて投与後の方が該複合体の存在量が少ないと認められる場合に該候補化合物が抗血管新生薬として薬効を示している可能性が高いと判定する工程
を含む、抗血管新生薬の薬効評価方法。
〔7〕 前記〔1〕記載の抗体又はその抗原結合断片を含有してなる、抗血管新生薬の薬効評価用キット。
〔8〕 血管新生の抑制を要する疾患の治療または予防するための、前記〔1〕記載の抗体又はその抗原結合断片。
NITE BP−1474 (表示1760、受託日2012年11月29日)
工程(A):抗血管新生薬の候補化合物の投与後における被験個体由来の生体試料と、本発明の抗体又はその断片とを接触させて複合体を形成させて、該複合体の存在量を測定する工程
工程(B):前記工程(A)で測定された存在量を、投与前における存在量と比較する工程、ならびに
工程(C):前記工程(B)で行った比較において、該候補化合物の投与前に比べて投与後の方が該複合体の存在量が少ないと認められる場合に該候補化合物が抗血管新生薬として薬効を示している可能性が高いと判定する工程
を含む。
MLTC−1細胞に、Mock遺伝子、野生型バソヒビン2(野生型VASH2)としてAY834202ポリペプチドをコードする遺伝子、変異型バソヒビン2(変異型VASH2)としてAY834202ポリペプチドのアミノ酸番号281〜285のアミノ酸5個をアラニン4個に置換したポリペプチドをコードする遺伝子をそれぞれ導入し、得られた細胞(MLTC−1/Mock、MLTC−1/野生型VASH2、MLTC−1/変異型VASH2)を24穴プレートに1×105個/ウェルずつ播種し、0.5%血清を含む培地で24時間培養した。その後、低血清培地で17時間培養した臍帯静脈内皮細胞(HUVEC)5×104個をポアサイズ8μmのインサートに添加し、37℃で4時間インキュベートした後、メンブレンの下面に移動したHUVECをギムザ染色で染色した。下面に移動したHUVECを光学顕微鏡下に200倍でランダムに5視野カウントしその平均値および標準偏差を算出した。結果を図1に示す。なお、内皮細胞の遊走能検査は、in vitroでの代表的な血管新生のアッセイ法の1つである。
24穴プレートの各ウェルに、500μLの成長因子非添加Matrigel(BD Biosciences)を添加してゲル化させ、その上に低血清培地で17時間培養したHUVEC 7.5×104個(500μLに懸濁)を播種し、参考例1で得られたMLTC−1/Mock、MLTC−1/野生型VASH2、MLTC−1/変異型VASH2の培養上清500μLをそれぞれ添加して37℃で5時間インキュベートした。形成されたネットワークの分岐点を位相差顕微鏡下に40倍でランダムに5視野カウントしその平均値および標準偏差を算出した。PBS添加群を陰性コントロール、VEGF 20ng/mL添加群を陽性コントロールとした。結果を図2に示す。なお、内皮細胞のネットワーク形成能検査は、in vitroでの代表的な血管新生のアッセイ法の1つである。
(抗原の調製)
バソヒビン2タンパク質として、AY834202ポリペプチドのアミノ酸番号281〜285のアミノ末端あるいはカルボキシル末端にシステイン残基を付加したペプチドをシグマアルドリッチ社にて合成し、それぞれをクローン71、1694、1760、2356とした。得られた各ペプチドについて、マレイミド化したKLH〔Keyhole Limpet Hemocyanin、Imject(登録商標)Maleimide Activated mcKLH、ピアス社製〕を用いて、ペプチドのSH基を介してハプテン抗原を調製した。なお、AY834202ポリペプチドは、特許文献3に記載の方法に従って作製した。
バソヒビン2のハプテン抗原を、初回免疫には完全アジュバントと、2回目以降は不完全アジュバントと等量混和することにより、免疫原としての乳剤を調製した。
MLTC−1/野生型VASH2を24穴プレートに1×105個/ウェルずつ播種し、0.5%血清を含む培地で24時間培養した後、低血清培地で17時間培養したHUVEC 5×104個をポアサイズ8μmのインサートに添加した。この時マウスIgG、マウス抗血清(ポリクローナル抗体)、抗ヒトVASH2モノクローナル抗体のクローン71、1694、1760、2356をそれぞれ5μg/mLの濃度でlower chamberに添加した。37℃で4時間インキュベートした後、メンブレンの下面に移動したHUVECをギムザ染色で染色した。下面に移動したHUVECを光学顕微鏡下に200倍でランダムに5視野カウントしその平均値および標準偏差を算出した。MLTC−1/Mockを播種した群を陰性コントロールとした。結果を図3に示す。
24穴プレートの各ウェルに、500μLの成長因子非添加Matrigel(BD Biosciences)を添加してゲル化させ、その上に低血清培地で17時間培養したHUVEC 7.5×104個(500μLに懸濁)を播種し、MLTC−1/野生型VASH2の培養上清500μLを添加した。この時マウスIgG、マウス抗血清(ポリクローナル抗体)、抗ヒトVASH2モノクローナル抗体のクローン71、1760、あるいは以前にAY834202ポリペプチドのアミノ酸番号207(セリン)〜219(リジン)までの部分ペプチドを抗原として作成したモノクローナル抗体5E3をそれぞれ5μg/mLの濃度でlower chamberに添加した。37℃で5時間インキュベートした後、形成されたネットワークの分岐点を位相差顕微鏡下に40倍でランダムに5視野カウントしその平均値および標準偏差を算出した。MLTC−1/Mockを播種した群を陰性コントロールとした。結果を図4に示す。
6〜8週齢、雌のBALB−cヌードマウスの背部皮下に、ヒト卵巣漿液性腺癌細胞株(SKOV−3)1×106個を100μLのPBSに懸濁して移植した(n=4)。腫瘍が計測可能になった時点(直径5mm程度)よりマウスIgG(5mg/kg)あるいは抗ヒトVASH2モノクローナル抗体のクローン1760(5mg/kg)を腹腔内投与した。また、抗体投与時に腫瘍径を計測し、長径×短径×短径×1/2より腫瘍体積を算出し、平均値を算出した。抗体投与は計6回(0日目、4日目、7日目、12日目、15日目、19日目)行い、治療開始22日目に腫瘍を摘出した。腫瘍摘出直前の代表的な写真を図5に、腫瘍体積の変化を図6に示す。
6〜8週齢、雌のBALB−cヌードマウスの背部皮下に、実施例3と同様にして、ヒト卵巣漿液性腺癌細胞株(SKOV−3)1×106個を移植した(n=8)。腫瘍が計測可能になった時点(直径5mm程度、約1週間後)よりマウスIgG(5mg/kg)あるいは抗ヒトVASH2モノクローナル抗体のクローン1760(10、15、25、50mg/kg)、血管新生阻害薬であるベバシズマブ(中外製薬社製、5mg/kg)を腹腔内投与した。また、抗体投与時に腫瘍径を計測し、長径×短径×短径×1/2より腫瘍体積を算出し、平均値を算出した。抗体投与は計5回(0日目、4日目、7日目、11日目、14日目)行い、治療開始18日目に腫瘍を摘出した。18日目の腫瘍体積を図9に示す。
配列表の配列番号2は、AY834202ポリペプチドである。
Claims (9)
- 配列番号2に示されるアミノ酸配列のアミノ酸番号269〜288を認識する、抗バソヒビン2抗体又はその抗原結合断片であって、該抗バソヒビン2抗体が、受託番号NITE BP−1474で示されるハイブリドーマにより産生されるモノクローナル抗体である、抗体又はその抗原結合断片。
- 配列番号2に示されるアミノ酸配列のアミノ酸番号269〜288を認識する抗バソヒビン2モノクローナル抗体を産生する、受託番号NITE BP−1474で示されるハイブリドーマ。
- 請求項1に記載の抗体又はその抗原結合断片を含有してなる、血管新生抑制剤。
- 請求項1に記載の抗体又はその抗原結合断片を含有してなる、医薬組成物。
- 請求項3に記載の血管新生抑制剤を含有してなる、血管新生の抑制を要する疾患の治療用医薬組成物。
- 血管新生の抑制を要する疾患が、がんであることを特徴とする請求項5に記載の治療用医薬組成物。
- 工程(A):抗血管新生薬の候補化合物の投与後における被検個体由来の生体試料と、請求項1に記載の抗体又はその抗原結合断片とを接触させて複合体を形成させて、該複合体の存在量を測定する工程
工程(B):前記工程(A)で測定された存在量を、投与前における存在量と比較する工程、ならびに
工程(C):前記工程(B)で行った比較において、該候補化合物の投与前に比べて投与後の方が該複合体の存在量が少ないと認められる場合に該候補化合物が抗血管新生薬として薬効を示している可能性が高いと判定する工程
を含む、抗血管新生薬の薬効評価方法。 - 請求項1に記載の抗体又はその抗原結合断片を含有してなる、抗血管新生薬の薬効評価用キット。
- 血管新生の抑制を要する疾患の治療または予防するための、請求項1に記載の抗体又はその抗原結合断片。
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