JP5670192B2 - 新規p2x7エピトープ - Google Patents
新規p2x7エピトープ Download PDFInfo
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- JP5670192B2 JP5670192B2 JP2010524309A JP2010524309A JP5670192B2 JP 5670192 B2 JP5670192 B2 JP 5670192B2 JP 2010524309 A JP2010524309 A JP 2010524309A JP 2010524309 A JP2010524309 A JP 2010524309A JP 5670192 B2 JP5670192 B2 JP 5670192B2
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- 239000011734 sodium Substances 0.000 description 1
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- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
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- 239000004094 surface-active agent Substances 0.000 description 1
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- 229960003087 tioguanine Drugs 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61K39/00—Medicinal preparations containing antigens or antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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- A61P35/02—Antineoplastic agents specific for leukemia
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- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
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- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Description
- 配列番号2の配列からなるペプチド;
- 配列番号2の配列内の配列からなるペプチドであって、ATP非結合性P2X7受容体に選択的に結合することができるが、ATP結合性P2X7受容体に結合することができない抗体を生成させる免疫原として有用であるペプチド;
- 配列番号3の配列からなるペプチドであって、ATP非結合性P2X7受容体に選択的に結合することができるが、ATP結合性P2X7受容体に結合することができない抗体を生成させる免疫原として有用であるペプチド;または
- 配列番号3の配列内の配列からなるペプチドであって、ATP非結合性P2X7受容体に選択的に結合することができるが、ATP結合性P2X7受容体に結合することができない抗体を生成させる免疫原として有用であるペプチド
が提供される。
- 上述したペプチドに結合することができる;または
- 配列番号2の配列を有するペプチドの1または複数の残基を含むエピトープに結合することができる
抗体またはその断片が提供される。
- 上述した免疫複合体を形成する条件で、細胞、組織または細胞外体液を抗体またはその断片と接触させる工程;および
- 免疫複合体が形成したかどうかを検出する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片を含むことを決定する方法が提供される。
- 細胞、組織または細胞外体液においてペプチドと抗体の免疫複合体を形成する条件で、細胞、組織または細胞外体液を上述したペプチドと接触させる工程;および
- 免疫複合体が形成したかどうかを検出する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片に対する抗体を含むことを決定する方法が提供される。
- 上述したペプチド;および/または
- 上述した抗体または断片;および/または
- ATP非結合性P2X7受容体、その単量体または断片;および場合により
- 前記ペプチド、抗体もしくはその断片、またはATP非結合性P2X7受容体、その単量体もしくは断片に結合するさらなる抗体;
- 上述した方法においてキットを使用するための取扱説明書
を含むキットまたは組成物が提供される。
- 上述された免疫複合体を形成するための条件で、細胞、組織または細胞外体液を抗体またはその断片と接触させる工程;および
- 免疫複合体が形成されたかどうかを検出する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片を含むことを決定する方法が提供される。
- 細胞、組織または細胞外体液においてペプチドと抗体の免疫複合体を形成するための条件で、細胞、組織または細胞外体液を上述されたペプチドと接触させる工程;および
- 免疫複合体が形成されたかどうかを決定する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液が、ATP非結合性P2X7受容体、その単量体または断片に対する抗体を含むことを決定する方法が提供される。
(i)精製された抗原を用いて、宿主血清中の抗体を検出するアッセイ。例えば、精製された抗原は、吸着によって、または間接的に別の分子を介して固相に結合され、宿主血清が適用され、次に、宿主抗体の存在または不存在を検出するための別の抗体が適用される;
(ii)精製された抗原を用いて、TおよびBリンパ球などの免疫細胞を検出するアッセイ。例えば、末梢白血球は、宿主から精製され、精製された抗原とともに培養される。次に、免疫性を示す1または複数の因子の存在または不存在を検出する。他の例には、精製された抗原への曝露後の細胞増殖(リンパ球の増殖または形質転換アッセイ)を測定するアッセイ;ならびに、精製された抗原への曝露後の細胞死(アポトーシスを含む)を測定するアッセイが挙げられる;
(iii)抗原に特異的な精製された抗体を用いて宿主における抗原を検出するアッセイ。例えば、精製された抗体は、固相に結合され、次に、宿主組織が検出されるべき抗原に特異的な別の抗体によって適用される。ELISA、RIAを含むこのアプローチの多くの例がある。
(iv)精製された抗イディオタイプ抗体を用いて宿主抗体を検出するアッセイ。例えば、抗イディオタイプ抗体は、固相に吸着され、宿主血清が添加され、抗Fc抗体を添加して、抗体イディオタイプ抗体によって結合した任意の宿主抗体に結合させる。
- 細胞、組織または細胞外体液におけるペプチドと抗体の免疫複合体を形成するための条件で、細胞、組織または細胞外体液を上述したペプチドと接触させる工程;または
- 上述した免疫複合体を形成させるための条件で、細胞、組織または細胞外体液を抗体またはその断片と接触させる工程;および
- 免疫複合体が形成されたかどうかを検出する工程
を含み、免疫複合体の検出は、個体が癌であることを決定する方法が提供される。
- 上述したペプチド;および/または
- 上述した抗体もしくはその断片;および/または
- ATP非結合性P2X7受容体、その単量体もしくは断片;および、場合により
- ペプチド、抗体もしくはその断片またはATP非結合性P2X7受容体、その単量体もしくは断片に結合するためのさらなる抗体;
- 上述した方法においてキットを使用するための取扱説明書
を含むキットまたは組成物が提供される。
抗非機能的P2X7抗体は、ヒトP2X7タンパク質のアミノ酸297〜313を示すKYYKENNVEKRTLIKVF(配列番号2)、すなわちLys-Tyr-Tyr-Lys-Glu-Asn-Asn-Val-Glu-Lys-Arg-Thr-Leu-Ile-Lys-Val-Pheに対するものであった。このペプチドは、固相化学(Mimotopes Pty Ltd、Melbourne、Australia)によって合成され、質量分析によれば高純度(>95%)であることが分かった。C末端のCys(C)残基をこの配列に結合させ、架橋剤MCS(6-マレイミド-カプロン酸 H-ヒドロキシスクシンイミドエステル)をこの配列に結合させて、Mimotopesによって提供される、個別にジフテリアトキソイド、ウシ血清アルブミンおよびオボアルブミンを含む担体タンパク質にこのペプチドをコンジュゲートさせた。
10〜12週齢の雌性ニュージランド白ウサギを以下のスケジュールに従って免疫した。
0.2mLのエピトープアジュバント乳液中の20μgのP2X7エピトープ(約50μgのDTコンジュゲート)でマウスを注射したことを除いて、実施例2の手法を用いた。
上記で選択したマウスを脾臓細胞ドナーとして用い、これらの細胞をマウスSP20骨髄腫細胞と融合させて、KohlerおよびMilsteinによって記載されたオリジナルプロトコールを改変させた96ウェルプレート用フォーマットに従って、ハイブリドーマ細胞株を樹立した。
標的エピトープに対する適切な高親和性を有するモノクローナル抗体をIHC研究のために選択した。抗体の結合特性は、Biacore装置上で標的エピトープの相互作用を測定することによって試験した。結合の全550共鳴単位は、速度が遅いことを示す60秒のローディング時間で達成された。ローディングの停止に伴い、続く10分以上結合が測定できないほどに減少したので、非常に遅い速度であることが確認できた。
非機能的受容体を発現している、固定され、および透過性にされたC11STH細胞へのモノクローナル抗体の結合をフローサイトメーター(Becton-Dickenson)上でAlexa-488標識を用いて行った。陰性の対照が1.9であったのと比較して、平均値は90.8であった。また、固定されていない生存細胞の表面上の受容体へのモノクローナル抗体の結合を評価した。陰性の対照が0.34であったのと比較して、平均値は5.8であった。
固定された細胞に関して、標準的な蛍光抗体染色および共焦点顕微鏡を以下のように用いた。48ウェルプレート内の、ポリ-L-リジンで被覆したガラス製カバースリップ上に固定された細胞を、pH7.5のリン酸緩衝生理食塩水(PBS)中の20%の正常なウマ血清とともに20分間インキュベートし、PBSで5分間洗浄し、次に一次抗体とともに30分間インキュベートし、PBSで5分間洗浄し、最後に、蛍光標識した二次抗体(Jackson Immunologics)を用いて30分間標識した。次に、細胞をPBSで2回洗浄(2×5分間)し、その後、50%グリセロールのPBS中にあるスライド上でカバースリップを積層した。1.0にセットしたピンホールを有するLeica TCS NT UVレーザー共焦点顕微鏡システムを用いて細胞を視覚化した。マウスのアイソタイプ対照抗体は、陰性の対照として、規定通り使用し、染色は示さなかった。P2X7でトランスフェクトされたHEK293細胞のウェスタンブロットは、トランスフェクトされていない細胞およびエピトープで前処理されたホモジネートの試料中には存在しない、約75kDaの単一バンドを示した。細胞のタンパク質抽出物(30μg)および分子量マーカーは、ドデシル硫酸ナトリウムのポリアクリルアミノドゲル(8〜16%)(Novex)上で分画された。タンパク質は、イモビロン-Pメンブレン(Millipore)上で電気ブロットされた。ウェスタンブロットは、ECL-ケミルミネッセンスシステム(Amersham)を用いて発色させた。
全体で25の異なる症例の乳癌、25症例の皮膚癌、および25症例の前立腺癌を免疫組織化学法によって調べた。赤血球細胞に存在する機能的受容体と非機能的受容体抗体との間の交差反応性はなかった(データ示さず)。
受容体発現が癌の潜在的な形態と攻撃的な形態の相違に潜在性を与える腫瘍悪性度とともに変化することが指示される。確かに、非常にゆっくりと成長している低悪性度の前立腺癌は、ほぼ全体的に細胞内にある受容体発現のパターンを示し、侵襲性前立腺癌の症例は、より多くの原形質膜および筋上皮細胞ラベリング、ならびに有意に増加した受容体密度を示す。
異形組織は診断が困難であり、異形成のバレット粘膜などの状態はモニターされる必要があり、組織が腺癌に形質転換する傾向がある。良性を維持する異形組織と、再度の差し迫った形質転換の極度の危険性がある組織の相違は、非機能的P2X7受容体発現の劇的なアップレギュレーションを示す関連した筋上皮染色の存在に集中する。類似の結果が、大腸炎などの他の異形な腸状態について観察された。異形のバレットの組織試料では、良性状態を指示する染色はなく、強い筋上皮染色を有する試料は、関連した腺癌を有する対象を特定した。
Claims (13)
- 配列番号3に示される配列からなる、または配列番号3に示される配列内の配列からなる、ペプチドであって、ATP非結合性P2X7受容体に選択的に結合することができるが、ATP結合性P2X7受容体に結合することができない抗体を生成させる免疫原として有用であり、配列番号2に示される配列を含む、ペプチド。
- 以下:
K281からK297、Y298からG314、T282からY298、Y299からI315、T283からY299、K300からR316、N284からK300、E301からF317、V285からE301、N302からD318、S286からN302、N303からI319、L287からN303、V304からL320、Y288からV304、E305からV321、P289からE305、K306からF322、G290からK306、R307からG323、Y291からR307、T308からT324、N292からT308、L309からG325、F293からL309、I310からG326、R294からI310、K311からK327、Y295からK311、V312からF328、A296からV312、またはF313からD329
の一つに従う配列を有する、請求項1に記載のペプチド。 - 配列番号2に示される配列を有するエピトープに結合することができる抗体。
- さらに配列番号3によって特定される領域の外側に位置する、P2X7受容体の細胞外ドメインの1または複数の残基に結合する、請求項3に記載の抗体。
- 前記P2X7受容体の細胞外ドメインの1または複数の残基が、配列番号10、配列番号11または配列番号12に示される配列の1または複数の残基である、請求項4に記載の抗体。
- dAb、Fab、Fd、Fv、F(ab')2、scFvおよびCDRからなる群から選択される、請求項3から5のいずれか一項に記載の抗体。
- 細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片を含むかどうかを決定するための方法であって、
- 免疫複合体を形成する条件で、細胞、組織または細胞外体液を、請求項3から6のいずれか一項に記載の抗体またはその断片と接触させる工程;および
- 免疫複合体が形成したかどうかを検出する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片を含むことを決定する、方法。 - 細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片に対する抗体を含有するかどうかを決定するための方法であって、
- 免疫複合体を形成する条件で、細胞、組織または細胞外体液を請求項1または2に記載のペプチドと接触させる工程;および
- 免疫複合体が形成したかどうかを検出する工程
を含み、免疫複合体の検出は、細胞、組織または細胞外体液がATP非結合性P2X7受容体、その単量体または断片に対する抗体を含むことを決定する、方法。 - 請求項3から6のいずれか一項に記載の抗体を医薬として許容される担体、希釈剤または賦形剤とともに含む医薬組成物。
- 請求項1または2に記載のペプチドを医薬として許容される担体、希釈剤または賦形剤とともに含む医薬組成物。
- 癌を治療するための医薬の製造における、請求項3から6のいずれか一項に記載の抗体の使用。
- 前記癌が癌腫、肉腫、リンパ腫、または白血病である、請求項11に記載の使用。
- 前記癌が前立腺癌、乳癌、皮膚癌、頚癌、子宮癌、胃癌、食道癌、膀胱癌、および結腸癌からなる群より選択される、請求項12に記載の使用。
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