JP6042919B2 - Ace2による炎症性疾患の治療 - Google Patents
Ace2による炎症性疾患の治療 Download PDFInfo
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- JP6042919B2 JP6042919B2 JP2015022979A JP2015022979A JP6042919B2 JP 6042919 B2 JP6042919 B2 JP 6042919B2 JP 2015022979 A JP2015022979 A JP 2015022979A JP 2015022979 A JP2015022979 A JP 2015022979A JP 6042919 B2 JP6042919 B2 JP 6042919B2
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- Enzymes And Modification Thereof (AREA)
Description
その場合オートロガス・シグナル配列(下線を付す)は宿主細胞によって除去のために切断される。従って本発明に基づくACE2タンパク質は配列番号1の18位以下に相当するACE2配列を含むことが好ましい。別の実施形態ではACE2ポリペプチドは膜貫通ドメインを持たない。この膜貫通ドメインは配列番号1のC末端にある。従ってその場合は可溶性ACE2となる。特に好ましい実施形態は、アミノ酸からなるポリペプチド鎖がアミノ酸740位に至るまでの配列番号1を含む可溶性ACE2ポリペプチドまたはその酵素活性フラグメントを包含する。別の可溶性ACE2タンパク質は配列番号1のアミノ酸18〜615からなる。
腎細胞株(Ceropithecus aethiops)Vero E6は通常の培養条件でACE2を膜結合糖タンパク質として発現する。Vero E6細胞を10ng/mlのIL−4、IFN−γまたはTNF−αと共に48時間インキュベートし、ポリクローナルACE2特異的ヤギ抗体およびヤギ特異的FITC標識抗体を使用して、ACE2表面発現に関する変化をFACS分析により分析した。図2にそれぞれのヒストグラムを示す。当該分析を表1にまとめた。IL−4、IFN−γまたはTNF−αと共にインキュベートすることによって、ACE2発現が著しく低減された。無刺激の細胞で51±3%のACE2陽性が測定されたが、IL−4、INF−γおよびTNF−α刺激の後にこれがそれぞれ28±2、22±1および39±2%に低下した(図2)。
本実施例では、刺激したPBMC(末梢血単核細胞)のサイトカイン発現に対するACE2の効果を説明する。種々のリンパ球の協動を可能にするために、PBMC調製物およびドナーの全リンパ球スペクトルをバッチに使用した。健康なドナーから全血を採取し、それに含まれるPBMCを遠心して分離した。続いてこの細胞をAngII、ACE2およびACE2とAngIIの存在下で強力な免疫原性物質、例えばリポ多糖(LPS、100ng/ml)および植物性血球凝集素(PHA、20μg/ml)ならびに両物質の組合せを用いて刺激し、37℃で16時間インキュベートした。上清をTNF−αについて調べ、ACE2およびRASのペプチドの不在で処理した対照バッチと比較した。この試験の結果を図3にグラフで示す。すなわちLPSおよびPHAとのインキュベーションはすべての場合にTNF−αの分泌を誘導する。ACE2なしで共インキュベートしたそれぞれの対照バッチは、それぞれLPS、PHAおよび組み合わせの刺激の後に極めて高いTNF−α濃度(203、352および278mOD)を示した。ACE2の存在下ですべてのグループで測定されたシグナルは著しく小さく、各グループで181、266、223のmOD値に達したにすぎない。ところがACE2とAngIIの存在下では、測定されたTNF−α濃度はきわめて小さく、mOD144、247および183にしか達しなかった。これらの結果が示すところでは、刺激のために特に免疫原性の物質、例えばLPSまたはPHAを使用しても、ACE2の存在は炎症性サイトカインの著しく弱められた産生をもたらす。このことはACE2の抗炎症効果を実証する。意外なことにこのメカニズムはAngIIの存在なしでも機能し、その存在のもとで強化される。このことは二重因子を示唆する。効果の一部分はAngIIおよびその分解産物Ang1−7によってもたらされ、その他の部分は明らかに他のACE2基質の分解によって機能し、現存するAngIIに関係がない(図3)。
本実施例では、外因性ACE2の投与がいかにして脱調節RASを再び制御下に置くかを示した。そのためにAPN01(組換え可溶性ヒトACE2)をLPS投与により誘導された敗血症モデルに投与した。−120分の時点から動物に連続的にLPSを輸液した。このため広範囲な炎症が、その結果敗血症が生じた。炎症性サイトカインの大量な放出に基づきACE2発現の遮断が起こり、その結果炎症性ペプチドAngIIの蓄積が生じた(図4を参照)。
以下の実施例では、ブタの敗血症モデルで炎症性サイトカインの濃度が急激に増加し、ACE2投与の後に再び健康な動物のレベルに戻ることを示す。−120分の時点から動物に高用量のLPSを連続的に輸液した。このため広範囲な炎症と、その結果敗血症が生じた。炎症性サイトカインの大量な放出に基づきACE2発現の遮断が起こった。その結果、炎症性ペプチドAngIIだけでなく、炎症性サイトカインTNF−αの蓄積が生じた(図6)。0分の時点から動物(処置群6頭、対照群5頭)に0.4mg/kgの用量のACE2または緩衝溶液を静脈内ボーラスとして投与した。LPSを引き続き同じ高用量で連続的に投与する一方で、動物をその後の3時間にわたり観察し、血清試料を採取し、TNF−αについて分析した。対照群のTNF−α濃度は実験の終りまで引き続き高かったが、ACE2で処置した群では、連続的LPS投与を伴う1回のACE2投与の後ですでにTNF−α濃度の著しい低下(p<0.001)が起こることを示すことができた。広範囲な敗血症にかかわらず、健康な動物で測定されたのとほぼ同じ値に再び到達した。従って、ACE2投与によって、非常に侵襲的な敗血症モデルでもTNF−α発現を急速に健常者のレベルに低下させ、引き続き増強する炎症を停止することができた(図6)。
本実施例では、ブタの肺障害モデルでの炎症性サイトカインの発現に対する全身的に投与したACE2の影響を示した。このプラセボ対照盲検試験では、14頭の動物について検討した。すべての動物に実験の第1段階で20%胎便溶液の3回の吸引を施し、その際高い血行動態パラメーターに基づきすべての動物に同等な障害が誘導された。実験の第2段階、すなわち処置段階で動物の半数に組換え可溶性ヒトACE2を0.4mg/kgの用量でボーラスとして静脈内投与した。他方の半数には生理食塩液を与えた。−30、0、30、60、90および150分の時点で血清試料を採取し、この試料で最重要の炎症性サイトカインを測定した。この場合、時点0は処置の開始点であり、この時すべての動物はすでにARDS(急性呼吸窮迫性症候群)の症状を示していた。図7から明らかなように、TNF−αの血清濃度に対するACE2投与の非常に明瞭な影響を示す。これはプラセボ群で230ng/ml超と大幅に上昇するが、処置群では投与の後30分以内に40ng/mlに低下し、投与後90分で25ng/mlに近づく。
上記のデータから、免疫調整剤としてのACE2の効果を次のように推論することができる。抗原刺激に基づき炎症性サイトカインの放出が起こる。炎症性サイトカインの存在下でACE2発現の欠失が生じる。ACE2が不在であれば、前炎症性ペプチド、AngIIはACE2によって分解されないために蓄積する。ACE2が不在であれば、同じく前炎症性サイトカインTNF−αが蓄積する。ACE2は抗炎症性を有し、リンパ球で炎症性サイトカインの発現を減少する。従って治療のためのACE2投与は失われた内因性ACE2発現を補償し、AngII力価の低下、Ang1−7の形成およびその他の効果による初期の炎症を阻止することができる。治療のためのACE2投与は重症敗血症の場合でも連続的LPS輸液のもとでAngII力価を再び健常者のレベルに引き下げ、それに応じてRASの調節を再び回復することを可能にする。また治療のためのACE2投与は重症敗血症の場合に連続的LPS輸液のもとでTNF−α力価を再び健常者のレベルに引き下げることを可能にする。胎便吸引による広範囲な機械的肺障害の場合も同じ効果を観察することができた。
Claims (6)
- 組換え水溶性ACE2を含む、全身性エリテマトーデスまたは強皮症の治療または予防のための組成物。
- 全身的投与のための、請求項1に記載の組成物。
- ACE2が哺乳動物に由来するものである、請求項1または2に記載の組成物。
- 哺乳動物がヒト、マウス、ラット、ハムスター、ブタ、霊長類またはウシである、請求項3に記載の組成物。
- 全身性エリテマトーデスまたは強皮症の治療または予防のための医薬組成物の製造のための組換え水溶性ACE2の使用。
- 医薬組成物が全身的に投与される、請求項5に記載の使用。
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US8557958B1 (en) | 2012-06-18 | 2013-10-15 | Tarix Pharmaceuticals Ltd. | Compositions and methods for treatment of diabetes |
US8633158B1 (en) | 2012-10-02 | 2014-01-21 | Tarix Pharmaceuticals Ltd. | Angiotensin in treating brain conditions |
US9333233B2 (en) | 2014-02-25 | 2016-05-10 | Tarix Pharmaceuticals Ltd. | Methods and compositions for the delayed treatment of stroke |
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WO2021174107A2 (en) * | 2020-02-26 | 2021-09-02 | Northwestern University | Soluble ace2 variants and uses therefor |
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WO2021237239A1 (en) * | 2020-05-18 | 2021-11-25 | Northwestern University | Active low molecular weight variant of angiotensin converting enzyme 2 (ace2) for the treatment of diseases and conditions of the eye |
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NO2222330T3 (ja) | 2018-03-10 |
AU2008338288B2 (en) | 2015-01-22 |
JP2011505842A (ja) | 2011-03-03 |
JP5755448B2 (ja) | 2015-07-29 |
EP3272357A1 (de) | 2018-01-24 |
NZ586228A (en) | 2012-06-29 |
PL2222330T3 (pl) | 2018-03-30 |
EP2222330B1 (de) | 2017-10-11 |
AU2008338288A1 (en) | 2009-06-25 |
US20110020315A1 (en) | 2011-01-27 |
WO2009076694A1 (de) | 2009-06-25 |
DK2222330T3 (en) | 2017-12-11 |
JP2017061510A (ja) | 2017-03-30 |
CA2709555C (en) | 2018-10-16 |
CA2709555A1 (en) | 2009-06-25 |
EP2222330A1 (de) | 2010-09-01 |
JP2015145368A (ja) | 2015-08-13 |
AT506258A1 (de) | 2009-07-15 |
US9561263B2 (en) | 2017-02-07 |
PT2222330T (pt) | 2018-01-03 |
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