JP2011510953A - 制御性t細胞活性を抑制するための、ヒトcd39に対する抗体およびその使用 - Google Patents
制御性t細胞活性を抑制するための、ヒトcd39に対する抗体およびその使用 Download PDFInfo
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Abstract
Description
本発明は、制御性T細胞(Treg)活性を抑制するための、ヒトCD39に対する抗体に関する。
制御性T細胞(Treg細胞)は、現在、それらの起源および抑制活性に応じて、2つの主要な部分集合に分類されている(Bluestone, J. A. & Abbas, A. K. Natural versus adaptive regulatory T cells. Nature Rev. Immunol. 3, 253-257 (2003))。内在性Treg細胞は、T−細胞受容体(TCR)と、胸腺ストロマにおいて発現した抗原との高親和性の相互作用によって、胸腺において発生する。これら内在性Treg細胞は、従来から、インビトロで、エフェクターT細胞の増殖を、接触依存的、かつ、サイトカイン非依存的に、抑制するものとして説明されている。内在性Treg細胞は、活性化リンパ球を特徴とする分子である、CD25、細胞傷害性Tリンパ球抗原4(CTLA4)、グルココルチコイド誘導性腫瘍壊死因子(TNF)受容体(GITR)およびOX40を構成的に発現する。しかしながら、少なくともマウス系では、転写因子FOXP3(フォークヘッドボックスp3)の高レベルの発現は、制御系統における最も際立ったマーカーである。今まで、不完全にしか特徴付けられていないが、内在性Treg細胞の抑制機構のネットワークは、CTLA4、膜結合性のトランスフォーミング成長因子(TGF)、および細胞周囲のアデノシンの産生といった表面分子を含む。
本発明は、増大した制御性T細胞(Treg)活性に関連付けられる疾病を治療または予防するためのCD39抗体に関する。
定義
「CD39」という語は、エクトヌクレオシド三リン酸塩ジホスホヒドロラーゼ−1(ENTPDl)とも呼ばれるCD39タンパク質を指す。CD39は、ATP/UTPおよびADP/UDPを、それぞれ、AMPなどのヌクレオシドに加水分解する外酵素である。
本願発明者は、BY40と呼ばれるCD39抗体を含む、CD39に対する抗体が、Treg活性を抑制することができることを証明した。ここに、本願発明者は、Treg活性を抑制するため、つまり、増大したTreg活性に関連付けられる疾病の治療または予防のための、CD39抗体の使用を提案する。
(i)CD39抗体を発現するハイブリドーマ(例えばCNCM-I-3889として寄託されたハイブリドーマ)を、抗体の発現を可能にするために適した条件下で培養するステップと、
(ii)発現された抗体を回復するステップとを含む。
本発明はまた、増大したTreg活性に関連付けられる疾病を治療または予防するための、CD39抗体を含む薬学的組成物に関する。
本発明は、ヒトCD39に対する、単離された抗体または該抗体のフラグメントを提供する。特に、本願発明者は、2008年1月4日に、マウスの CD39抗体 (BY40)を生成するハイブリドーマを、ブタペスト条約の条項に基づき、Collection Nationale de Cultures de Microorganismes (CNCM, Institut Pasteur, 25 rue du Docteur Roux, 75724 Paris Cedex 15, France)に寄託した。寄託したハイブリドーマのCNCM寄託番号は、I-3889である。
図1は、HIV-対照群およびHIV+患者群からのCD4+CD25lowおよびCD4+CD25highT細胞上のCD39の発現を示す図である。
HIV−対照群およびHIV+患者群からのCD4+CD251owおよびCD4+CD25high T細胞上のCD39の発現;
最近、マウスおよびヒトCD4+CD25high制御性T細胞は、エクトヌクレオチダーゼであるCD39を構成的に発現することが報告されている。エクトヌクレオチダーゼは、免疫活性化サイトで生成された細胞外ATPを変換し、細胞増殖の阻害剤であるアデノシンの生成を導く。ここで、我々は、抗CD39mAb BY40を用いて、HIV−対照群およびHIV+患者群からのCD4+CD251owおよびCD4+CD25high末梢血リンパ球(PBL)母集団におけるCD39の発現を検査した。図1からは、HIV−およびHIV+個体からのPBLでは、CD4+CD25high部分母集団内のCD39+細胞の割合が、CD4+CD251ow部分母集団内のCD39+細胞の割合よりも、著しく高い(p<0.01)ことが示されている(図1A)。平均は、16%対46%(HIV−)、および、17%対42%(HIV+)である。HIV-およびHIV+の群の間の母集団の同一のCD4+のそれぞれ比較した場合に、CD39+細胞間の割合に、統計上の差異は確認されなかった。
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Claims (7)
- 増大した制御性T細胞(Treg)活性に関連付けられる疾病を治療または予防するための、CD39抗体。
- 前記疾病は、癌および感染症からなる群から選択される、請求項1に記載の抗体。
- 前記疾病は、肺癌、乳癌、卵巣癌、黒色腫、肝臓癌、胃癌、およびリンパ腫からなる群から選択される、請求項2に記載の抗体。
- 前記疾病は、VIH、HBV、HCV、熱帯熱マラリア原虫、または結核菌による感染症からなる群から選択される、請求項2に記載の抗体。
- 前記抗体は、
可変ドメインが、CDR−H1として配列番号2と、CDR−H2として配列番号3と、CDR−H3として配列番号4とからなる群から選択された1つの配列を有する少なくとも1つのCDRを含む重鎖、および/または、
可変ドメインが、CDR−L1として配列番号6と、CDR−L2として配列番号7と、CDR−L3として配列番号8とからなる群から選択された1つの配列を有する少なくとも1つのCDRを含む軽鎖を含む、請求項1〜4のいずれか1項に記載の抗体。 - 配列番号1に示されるアミノ酸配列を含む重鎖可変領域と、
配列番号5に示されるアミノ酸配列を含む軽鎖可変領域とを含む、請求項1〜5のいずれか1項に記載の抗体。 - 増大した制御性T細胞(Treg)活性に関連付けられる疾病を治療または予防するための、請求項1〜6のいずれか1項に記載の抗体と薬学的に許容される担体とを含む、薬学的組成物。
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JP2016529892A (ja) * | 2013-08-01 | 2016-09-29 | ユニベルシテ カソリク デ ロウバイン | 抗garpタンパク質及びその使用 |
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PT2238170T (pt) | 2017-02-21 |
US20160137747A1 (en) | 2016-05-19 |
EP3153526A1 (en) | 2017-04-12 |
US10662253B2 (en) | 2020-05-26 |
HUE032025T2 (en) | 2017-08-28 |
ES2848323T3 (es) | 2021-08-06 |
EP2238170B1 (en) | 2016-11-23 |
US11685792B2 (en) | 2023-06-27 |
EP2238170A1 (en) | 2010-10-13 |
JP2015057405A (ja) | 2015-03-26 |
US20210032367A1 (en) | 2021-02-04 |
WO2009095478A1 (en) | 2009-08-06 |
DK2238170T3 (en) | 2017-02-27 |
DK3153526T3 (da) | 2020-12-14 |
US20100303828A1 (en) | 2010-12-02 |
JP6018361B2 (ja) | 2016-11-02 |
JP6041842B2 (ja) | 2016-12-14 |
ES2618292T3 (es) | 2017-06-21 |
EP3153526B1 (en) | 2020-09-23 |
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