JPWO2016104490A1 - 新規な敗血症治療剤及び/又はそのスクリーニング方法 - Google Patents
新規な敗血症治療剤及び/又はそのスクリーニング方法 Download PDFInfo
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Abstract
Description
本発明は、より有効な敗血症及び/又は敗血症性ショックの治療剤、並びにそのスクリーニング方法を提供することを目的とする。
〔1〕Arid5A阻害剤を有効成分とする、敗血症及び/又は敗血症性ショック治療剤である。
〔2〕Arid5A阻害剤が、核酸オリゴ、及びArid5A抗体からなる群より選ばれる1種以上の物質である、〔1〕記載の敗血症及び/又は敗血症性ショック治療剤である。
〔3〕核酸オリゴが、天然及び非天然のRNAまたはDNAからなるオリゴである、〔2〕記載の敗血症及び/又は敗血症性ショック治療剤である。
〔4〕敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの発現及び/又は機能に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの発現及び/又は機能を減少させる物質を選択する工程、
とを含んでなる方法である。
〔5〕〔4〕に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの発現に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの発現を減少させる物質を選択する工程、
とを含んでなる方法である。
〔6〕〔4〕に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質を、実験動物に投与する工程、
(b)該Arid5Aの発現に対する影響についてPCRにて測定する工程、及び
(c)被験物質を実験動物に投与しない場合と比較して、Arid5Aを減少させる物質を選択する工程、
とを含んでなる方法である。
〔7〕〔4〕に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの機能に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの機能を減少させる物質を選択する工程、
とを含んでなる方法である。
〔8〕〔7〕に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該Arid5Aの機能がIL−6mRNAの安定化である方法である。
〔9〕Arid5A阻害剤を投与することを含んでなる、敗血症及び/又は敗血症性ショックの治療方法である。
〔10〕敗血症及び/又は敗血症性ショックの治療に使用するためのArid5A阻害剤である。
〔11〕敗血症及び/又は敗血症性ショックの治療剤の製造のためのArid5A阻害剤の使用である。
本発明は、敗血症および/又は敗血症性ショック治療剤、並びにそのスクリーニング方法に関する。本発明の敗血症および/又は敗血症性ショック治療剤は、Arid5A阻害剤を有効成分とする。
原核細胞を使用する場合、細菌細胞を用いる産生系がある。細菌細胞としては、大腸菌(E.coli)、枯草菌が知られている。
一方、in vivoの産生系としては、動物を使用する産生系や植物を使用する産生系が挙げられる。動物を使用する場合、哺乳類動物、昆虫を用いる産生系などがある。
パパイン消化:Fab;
ペプシン消化:F(ab')2またはF(ab');
プラスミン消化:Facb。
[VH]−[リンカー]−[VL]−[リンカー]−[VH]−[リンカー]−[VL]
の順に結ぶことによっても作製できる。なお2つのVHと2つのVLの順序は特に上記配置に限定されず、どのような順序で並べられていてもよい。例えば以下のような配置も挙げることができる。
[VL]−[リンカー]−[VH]−[リンカー]−[VH]−[リンカー]−[VL]
[VH]−[リンカー]−[VL]−[リンカー]−[VL]−[リンカー]−[VH]
[VH]−[リンカー]−[VH]−[リンカー]−[VL]−[リンカー]−[VL]
[VL]−[リンカー]−[VL]−[リンカー]−[VH]−[リンカー]−[VH]
[VL]−[リンカー]−[VH]−[リンカー]−[VL]−[リンカー]−[VH]
複数のリンカーは、同じ種類のリンカーであってもよいし、異なる種類のリンカーであってもよい。
で表されるクロルプロマジン又はその医薬上許容しうる塩を含む。クロルプロマジンは、Arid5A発現の阻害を介してIL−6のmRNAの発現も阻害し、IL−6のmRNAの安定化を特異的に阻害する。
所望によりさらに希釈剤、溶解補助剤、pH調整剤、無痛化剤、含硫還元剤、酸化防止剤等を含有してもよい。
使用される製剤上許容しうる担体は、剤型に応じて上記の中から適宜あるいは組合せて選択されるが、これらに限定されるものではない。
(a)被験物質のArid5Aの発現及び/又は機能に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの発現及び/又は機能を減少させる物質を選択する工程、
とを含んでなる。
また、被験物質を用いない場合と比較して、該Arid5Aの発現および/または機能を減少させる物質を選択する工程を含む。
本態様では、次いで、Arid5Aと結合する被験物質を選択する。選択された物質には、被験物質を接触させない場合と比較して、Arid5Aの発現または機能を減少させる物質が含まれ、Arid5Aの発現または機能を抑制することによって、結果的に敗血症および/または敗血症性ショックを治療または予防する効果を示すものと考えられる。
第四の態様において、「機能的に結合した」とは、Arid5A遺伝子のプロモーター領域に転写因子が結合することにより、レポーター遺伝子の発現が誘導されるように、Arid5A遺伝子のプロモーター領域とレポーター遺伝子とが結合していることをいう。従って、レポーター遺伝子が他の遺伝子と結合しており、他の遺伝子産物との融合タンパク質を形成する場合であっても、Arid5A遺伝子のプロモーター領域に転写因子が結合することによって、該融合タンパク質の発現が誘導されるものであれば、上記「機能的に結合した」の意に含まれる。
Arid5AをコードするDNAのプロモーター領域の下流にレポーター遺伝子が機能的に結合したDNAを有する細胞または細胞抽出液は、上述の方法にて調製することが可能である。
本態様では、次いで、IL−6mRNAと結合する被験物質を選択する。選択された物質にはArid5Aの発現および/または機能を減少させる物質が含まれ、Arid5Aの発現または機能を抑制することによって、結果的に敗血症および/または敗血症性ショックを治療または予防する効果を示すものと考えられる。
CLEA社からC57BL/6野生型マウス(6−8週)を入手し、Arid5Aノックアウトマウス(No.CDB0602K:www.cdb.riken.jp/arg/mutant%20mice%20list.html)をwww.cdb.riken.jp/arg/Methods.htmlの方法により作製した。Arid5A遺伝子のDNA結合ドメインの主要部分を、両端をloxP配列で挟んだNeo−cassetteによって置換するように構築したターゲッティングベクターを、TT2株ES細胞にエレクトロポレーション法により導入した。相同的組み換えによる遺伝子破壊は、Arid5Aの遺伝子の3’UTRに対するプローブを使用したサザンブロッティング法により確認し、得られた変異ES細胞を用いてキメラマウスを作製した。変異アレルのジャームライントランスミッションの確認は、キメラマウスをC57BLマウスと交配して得られた次世代のマウスのゲノムDNAを用いた、サザンブロッティング解析およびゲノムPCR(プライマー1:5’−ATACTTTCTCGGCAGGAGCA−3’;プライマー2:5’−TGAATGAACTGCAGGACGAG−3’)により行った。ヘテロ接合型の変異マウスは特定病原体のフリーの環境下で飼育し、C57BLマウスと5回の戻し交配を行った。
8〜9週齢のArid5Aノックアウトマウス(Arid5A-/-)及び野生型マウス(それぞれ体重18-20g)に対し、Escherichia coli血清を型0127:B8から得られたLPS(シグマ−アルドリッチ社)を腹腔内に投与し、7日間死亡率を観察した。また、LPS投与4時間後にIL−6とIFNγの役割を調べるために抗IL−6受容体抗体(MR16−1抗体、250mg/kg)、抗IFNγ抗体(R4−6A2 BioLegend, 25mg/kg)を投与し、7日間死亡率を観察した。
その結果、野生型、IL−6受容体抗体、TNF抗体を投与したマウスは死亡したのに対し、Arid5Aノックアウトマウスでは敗血症性ショックが起こらなかった。
マウスマクロファージ細胞株RAW264.7に、Arid5AのsiRNA( SASI_Mm02_00341523 (sigma))又はコントロールのsiRNA(100nM)をエレクトロポレーション法にて導入した。24時間の培養後、細胞をLPS(100ng/mL)で24時間刺激し、得られた細胞からRNAを抽出した。Arid5AのmRNAレベルをqPCRによって定量した(図3)。また、それぞれの培養上清中のIL−6及びTNF−αの濃度をELISA法によって定量した(図4及び5)。図3に示す通り、RAW264.7にArid5AのsiRNAを導入したことにより、Arid5AのmRNA発現レベルが顕著に低下した。また、図4及び図5に示す通り、Arid5AのsiRNAを導入した細胞においては、LPS刺激によって産生されるIL−6の量が減少したのに対して、TNF−αの量には変化がなかった。
C57BL/6マウス(6〜8週齢)の腹腔マクロファージを、被験物質(20μM)存在下又は非存在下において、LPS(1μg/mL)で刺激した。定量PCR(qPCR)によって、上記刺激した腹腔マクロファージにおけるArid5A、IL−6及びTNF−αのmRNAの相対発現レベルを測定した。Arid5AのmRNAについては、LPS刺激2時間後、IL−6のmRNA及びTNF−αのmRNAついては、LPS刺激2時間後、6時間後、12時間後、24時間後の発現レベルを測定した。被験物質として、クロルプロマジン(CPZ)を使用した結果を図6〜8に示す。
Claims (11)
- Arid5A阻害剤を有効成分とする、敗血症及び/又は敗血症性ショック治療剤。
- Arid5A阻害剤が、核酸オリゴ、及びArid5A抗体からなる群より選ばれる1種以上の物質である、請求項1記載の敗血症及び/又は敗血症性ショック治療剤。
- 核酸オリゴが、天然及び非天然のRNAまたはDNAからなるオリゴである請求項2記載の敗血症及び/又は敗血症性ショック治療剤。
- 敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの発現及び/又は機能に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの発現及び/又は機能を減少させる物質を選択する工程、
とを含んでなる方法。 - 請求項4に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの発現に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの発現を減少させる物質を選択する工程、
とを含んでなる方法。 - 請求項4に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質を、実験動物に投与する工程、
(b)該Arid5Aの発現に対する影響についてPCRにて測定する工程、及び
(c)被験物質を実験動物に投与しない場合と比較して、Arid5Aの発現を減少させる物質を選択する工程、
とを含んでなる方法。 - 請求項4に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該方法は、
(a)被験物質のArid5Aの機能に対する影響を評価する工程、及び
(b)被験物質を用いない場合と比較して、Arid5Aの機能を減少させる物質を選択する工程、
とを含んでなる方法。 - 請求項7に記載の敗血症及び/又は敗血症性ショックの治療に有用な候補物質のスクリーニング方法であって、該Arid5Aの機能がIL−6mRNAの安定化である方法。
- Arid5A阻害剤を投与することを含んでなる、敗血症及び/又は敗血症性ショックの治療方法。
- 敗血症及び/又は敗血症性ショックの治療に使用するためのArid5A阻害剤。
- 敗血症及び/又は敗血症性ショックの治療剤の製造のためのArid5A阻害剤の使用。
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