JP6188929B2 - 肺高血圧症の検査方法 - Google Patents
肺高血圧症の検査方法 Download PDFInfo
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Description
[2]上記[1]の結果に基づき、肺高血圧症の有無及び/又はリスクを評価する工程を含む、請求項1に記載の方法。
(i)被験対象由来の試料中のセレノプロテインPタンパク質の濃度を指標として肺高血圧症の検査をする工程、及び
(ii)肺高血圧症が検出された被験対象に、肺高血圧症を治療及び/又は肺高血圧症の進行の予防をするための処置を行う工程。
肺高血圧症
本発明の検査方法は、肺高血圧症を対象とする。
本発明の検査方法は、被験対象由来の試料中のセレノプロテインPタンパク質の濃度を指標とする。
本発明の検査方法において、試料は被験対象から採取したものを用いる。
[1]被験対象由来の試料中のセレノプロテインPタンパク質の濃度を測定する工程、及び
[2]上記[1]の結果に基づき、肺高血圧症の有無及び/又はリスクを評価する工程を含む、検査方法である。
本発明の検査方法において、セレノプロテインP(Selenoprotein P、SeP)タンパク質の試料中濃度を指標とする。
ヒトセレノプロテインP タンパク質:NP_005401、NP_001078955、NP_001087195
ヒトセレノプロテインP mRNA:NM_005410、NM_001085486、NM_001093726
マウスセレノプロテインP タンパク質:NP_033181、NP_001036078、NP_001036079
マウスセレノプロテインP mRNA:NM_009155、NM_001042613 、NM_001042614。
本発明の検査方法において、試料中のSelenoprotein Pタンパク質の濃度測定に基づき、肺高血圧症の有無及び/又はリスクを評価することができる。検査方法における評価基準は、当業者が適宜選択することができる。
本発明の検査方法は、他の公知の、あるいは将来的に見出される肺高血圧症の検査方法と組み合わせてもよい。
本発明は、肺高血圧症を検査するためのキットをも提供する。
本発明は、肺高血圧症の治療方法をも提供する。発明でいう「治療」とは、肺高血圧症の治療、並びに、症状の軽減及び再発防止のための維持療法を包含する。
(i)被験対象由来の試料中のセレノプロテインPタンパク質の濃度を指標として肺高血圧症の検査をする工程、及び
(ii)肺高血圧症が検出された被験対象に、肺高血圧症を治療及び/又は肺高血圧症の進行の予防をするための処置を行う工程を含む。
肺高血圧症患者及び非肺高血圧症患者における、セレノプロテインPタンパク質の血漿中濃度を測定した。測定対象とした肺高血圧症患者は、肺動脈性肺高血圧症であると診断された患者であった。
以下の患者群から採取した血液について試験を行った。
(ii)肺高血圧症患者(PH)群 :146人。
上記患者群から、右心カテーテル検査の時に得た末梢静脈由来の血液試料及び肺動脈由来の血液試料から血漿を分離し、セレノプロテインPタンパク質の血漿中濃度を、Human Selenoprotein P, SEPP1 ELISA Kit(Cusabaio社製、型番CSB-EL021018HU)を用いてELISAにより測定した。
結果を図1に示す。図1に示すように、肺高血圧症患者のセレノプロテインPタンパク質の血漿中濃度は、非肺高血圧症患者と比べて有意に高いことが明らかとなった。
実施例1と同様に、肺高血圧症患者及び非肺高血圧症患者における、セレノプロテインPタンパク質の血漿中濃度を測定した。
以下の患者群から採取した血液について試験を行った。
(ii)肺高血圧症患者(PH)群 :183人。
結合組織病(CPAH、ニース分類 第1群 4)-1):25人、
慢性血栓塞栓性肺高血圧症(CTEPH、ニース分類 第4群):51人、
特発性肺動脈性肺高血圧症(IPAH、ニース分類第1群 1)):58人、
肺疾患および/または低酸素血症に伴う肺高血圧症(Lung-PAH、ニース分類 第3群):10人、
詳細不明な多因子のメカニズムに伴う肺高血圧症(non-categorized、ニース分類 第5群):13人、
門脈肺高血圧(proto-PH、ニーズ分類 第1群 4)-3):6人、及び
先天性心疾患(shunt PAH、ニース分類 第1群 4)-4):20人。
実施例1と同様にして、上記患者群から取得した血液試料から血漿を分離し、セレノプロテインPタンパク質の血漿中濃度を測定した。
結果を図3及び図4に示す。図3は測定をした肺高血圧症患者の全体についての結果を示し、図4は肺高血圧の病型ごとの結果を示す。肺高血圧症の病型によらず、すべての病型の肺高血圧症患者において、セレノプロテインPタンパク質の血漿中濃度は、非肺高血圧症患者と比べて有意に高いことが明らかとなった。
特発性肺動脈性肺高血圧症(IPAH)患者の肺血管平滑筋(Pulmonary Artery Smooth Muscle Cells、PASMC)(以下、IPAH-PASMCともいう。)における、低酸素圧刺激に対する反応性を観察した。
特発性肺動脈性肺高血圧症患者の肺血管平滑筋から、初代培養細胞系統を文献Ogawa A, Nakamura K, Matsubara H, Fujio H, Ikeda T, Kobayashi K, Miyazaki I, Asanuma M, Miyaji K, Miura D, Kusano KF, Date H, Ohe T. Circulation. 2005;112:1806-1812.準じて樹立した。特発性肺動脈性肺高血圧症患者の肺血管平滑筋は、外径が1.5mm以下の肺動脈から単離をした。
IPAH-PASMCは、10%FBS(ウシ胎仔血清、終濃度)を添加したD-MEM培地中で、温度37℃の恒温恒湿条件下、95%の大気と5%の二酸化炭素中で、常法に従い培養を行った。試験には、70〜80%コンフルエンスの、継代4〜7代目(Passage 4 to 7)の細胞を用いた。
試験に用いる細胞を、正常酸素圧(normoxia、酸素濃度21%)、低酸素圧(hypoxia、酸素濃度2%)及びファスジル(fasudil)存在下での低酸素圧(Hydroxyfasudil濃度:10μM)のそれぞれの条件下で24時間培養した。
結果を図2に示す。特発性肺動脈性肺高血圧症患者由来の肺血管平滑筋細胞は、低酸素圧下で、正常酸素濃度圧下と比べて、細胞外(培地中)へのセレノプロテインPタンパク質の分泌が亢進することが明らかとなった。また、Rhoキナーゼ(ROCK)に対する阻害剤であるファスジル(fasudil)の存在下では、低酸素条件下においても、セレノプロテインPタンパク質の分泌の亢進は観察されなかった。
Claims (6)
- 被験対象由来の試料中のセレノプロテインPタンパク質の濃度を指標とする、肺高血圧症の検査方法。
- [1]被験対象由来の試料中のセレノプロテインPタンパク質の濃度を測定する工程、及び
[2]上記[1]の結果に基づく、肺高血圧症の有無及び/又はリスクを判定するための工程を含む、請求項1に記載の方法。 - セレノプロテインPタンパク質の濃度が予め設定したカットオフ値より大きい場合に、肺高血圧症である及び/又は発症するリスクがあると判定するための、請求項2に記載の方法。
- 被験対象由来の試料が血漿である、請求項1〜3のいずれか1項に記載の方法。
- セレノプロテインPタンパク質からなる、肺高血圧症を検出するためのバイオマーカー。
- セレノプロテインPタンパク質に特異的に結合する抗体を含む、肺高血圧症の検査キット。
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