JP5809068B2 - 免疫抑制−関連疾患の治療 - Google Patents
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Description
本出願は、2009年2月24日に出願された、米国特許出願第12/391,581号の優先権を主張する。該出願の内容は、全体として参照により本明細書に取り込まれる。
免疫系は、病原体感染、細胞形質転換、および物理学的または化学的なダメージから生体を守る。免疫系が正常より活性が低い場合に、免疫欠損または免疫抑制が起こり、結果的に、致命的な感染または癌をもたらす。免疫抑制は、疾患の結果であるか、薬剤または感染症によって引き起こされる可能性がある。全身免疫抑制は、腫瘍増殖に続発する異常な骨髄造血、骨髄抑制療法ならびに増殖因子の投与およびその後の免疫抑制細胞由来の骨髄の拡大/流動に関連することがわかった。これらのミエロイド由来サプレッサー細胞(MDSCs, myeloid−derived suppressor cells)は、活性化されたT−細胞の数を減少し、複数の作用機構によるT−細胞機能を阻害することで、免疫抑制および免疫寛容をもたらす。従って、MDSCsは、促進腫瘍(pro−tumor)の役割を持っている。さらに、MDSCsは、腫瘍内微小環境においての変異誘導、血管形成および転移の促進、ならびに腫瘍性成長および炎症反応の両方の直接支援を含む多面的な活性をもつ。実際に、このような細胞は、感染症、炎症性病気、移植片対宿主病(Graft−Versus−Host Disease)、心的外傷性ストレス、および腫瘍性疾患を含む多数の病状で増加する。 (Dolcetti et al., Cancer Lett. 2008 Aug 28; 267(2): 216−25; Talmadge, Clin Cancer Res. 2007 Sep 15;13(18 Pt 1):5243−8)。
本発明は、成熟したまたは幼弱な動物から作製した幹細胞の集団、すなわち卵割球様幹細胞(BLSCs, blastomere−like stem cells)が、動物のMDSCsの数を著しく減少することができるという、少なくとも部分的に予期せぬ発見に基づいている。
E.W.Martin、第18版による「Remington’s Pharmaceutical Sciences」中に記載されている。
BLSCsの活性化、精製、および増殖方法は、国際公開第2007/100845号に公開されている。本実施例において、BLSCsは、2つの方法を用いてヒト患者の血液から精製された。その2つの方法とは、血漿分画法(plasma fraction method)および溶血法(hemolysis method)である。
その次に、BLSCsを、国際特許公開第2007/100845号に記載されている方法、または当業者にはよく知られている方法を用いて、それらの分化能力について調べた。その結果によると、当業者に知られる条件下で誘導の際に、それらの細胞は、外胚葉、中胚葉、内胚葉、および精原細胞に由来するものを含む多様な系統に分化することが分かった。それらは、分化ポテンシャルを失うことなく、300を超える継代で未分化の状態で維持し、拡張される。それらは、奇形種を形成しなかった。
BLSCsを、上記方法に従い、ヒト患者から精製し、1x109個細胞で自己移植の患者に投与した。投与後、0日目、14日目、および28日目に、ヒトから血液サンプルを得た。次いで、サイトメトリー分析は、血液のMDSCsおよびTregレベルを調べるために行われた。その結果、0日目、14日目、および28日目のMDSCs(CD14−CD33+CD11b+Lin−)レベルは、それぞれ全抹消血液単核細胞(PBMC)の9.24%、2.19%、および0.35%であることが分かった。これらの結果は、BLSCsが大幅に患者のMDSCsのレベルを減少し、したがって、MDSCs関連免疫欠損疾患を持つ患者を治療するために使用することができることを示している。
本明細書で開示されているすべての特徴は、どのような組み合わせにおいても組み合わせることができる。明細書で開示されている各特徴は、同じ、等価の、または同様の目的を果たす他の特徴によって置換することができる。したがって、他で明示的に述べられていない限り、開示されている各特徴は等価のまたは他の特徴を有する包括的一群の一例に過ぎない。
Claims (9)
- 割球様幹細胞(blastomere−like stem cells)を有効成分として含有する、細胞増殖疾患の治療、ミエロイド由来サプレッサー細胞レベルの減少、およびミエロイド由来サプレッサー細胞介在の免疫抑制の克服の少なくとも一つのための薬剤。
- 前記割球様幹細胞を一回あたり1×108〜1×1011個で投与する、請求項1に記載の薬剤。
- 前記割球様幹細胞を一回あたり5×108〜5×1010個で投与する、請求項2に記載の薬剤。
- 前記割球様幹細胞を一回あたり1×109〜1×1010個で投与する、請求項3に記載の薬剤。
- 前記割球様幹細胞を二週間一回2〜5回投与する、請求項1〜4のいずれか1項に記載の薬剤。
- 前記割球様幹細胞を二週間一回3回投与する、請求項5に記載の薬剤。
- 前記割球様幹細胞は、患者自己細胞である、請求項1〜6のいずれか1項に記載の薬剤。
- 患者におけるミエロイド由来サプレッサー細胞レベルを測定する前または後に、前記割球様幹細胞が投与される、請求項1〜7のいずれか1項に記載の薬剤。
- 前記薬剤は、免疫抑制の克服のためであり、かつ前記免疫抑制は、ミエロイド由来サプレッサー細胞関連の免疫抑制である、請求項1〜8のいずれか1項に記載の薬剤。
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ES2582582T3 (es) | 2016-09-13 |
EP2400971A4 (en) | 2013-03-27 |
WO2010099044A2 (en) | 2010-09-02 |
US9770473B2 (en) | 2017-09-26 |
CN102325537A (zh) | 2012-01-18 |
US20100215622A1 (en) | 2010-08-26 |
JP2012518646A (ja) | 2012-08-16 |
EP2400971B1 (en) | 2016-05-18 |
WO2010099044A9 (en) | 2010-12-16 |
TW201040278A (en) | 2010-11-16 |
CN102325537B (zh) | 2014-07-30 |
US20140030237A1 (en) | 2014-01-30 |
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