JP2021516765A - 心筋損傷の診断方法 - Google Patents
心筋損傷の診断方法 Download PDFInfo
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Abstract
Description
心房心筋肉組織におけるMYBPHL、MYBPH、MYBPHLアイソフォーム1、及びMYBPHLアイソフォーム2遺伝子発現の増加
例えば “Region and cell-type resolved quantitative proteomic map of the human heart” Doll S, DreBen M, Geyer PE, Itzhak DN, Braun C, Doppler SA, Meier F, Deutsch MA, Lahm H, Lange R, Krane M, Mann M. Nat Commun. 2017 Nov 13;8(1):1469. doi: 10.1038/s41467-017-01747-2. PMID: 29133944 に従って、ヒトの心臓のプロテオームの試験を行った。心臓手術を受けた患者から生検によって得られた心臓組織試料中のさまざまなバイオマーカーの発現を、qPCRによって検証した。試験では、組織試料を以下の部位から採取した(組織試料の数はn=3):左心房(LA)、右心房(RA)、左心室(LV)、及び右心室(RV)。
血漿中のバイオマーカーMYBPHLの検出
バイオマーカーMYBPHLが血漿中に検出されるかどうかを決定するための試験が行われた。冠状動脈バイパス移植術や心臓弁手術などの心臓手術以外に、心房細動の治療のためにアブレーション(修正メイズ手術)を受けた患者群が試験された。メイズ手術では、患者の心内膜心筋肉組織又は心外膜心筋肉組織のいずれかに、集中的な意図した特異的心筋損傷が行われた。以下の測定時点で24時間にわたって、患者から血液試料が採取された:
1. Pre−OP 心臓手術の開始前
2. 0h 集中治療室への患者の到着
3. 2h 集中治療室への患者の到着の2時間後
4. 4h 集中治療室への患者の到着の4時間後
5. 6h 集中治療室への患者の到着の6時間後
6. 24h 集中治療室への患者の到着の24時間後
血漿中のバイオマーカーMYBPHLの濃度による損傷程度依存性
図6は、実施例2で説明したように、心内膜アブレーション(A)又は心外膜アブレーション(B)を受けた患者中における、定義された期間にわたる、及び測定時点における血漿試料中のMYBPHLタンパク質濃度の測定結果を示す。この試験では、9人の患者の群(n=9)が心内膜アブレーションを受け(A)、3人の患者の群(n=3)が心外膜アブレーションを受けた(B)。心内膜アブレーションは心外膜アブレーションより侵襲的なアブレーションであり、より強い心筋損傷を引き起こす。術後の値は、心内膜アブレーションと心外膜アブレーションの両方の患者群で、血漿中のMYBPHLタンパク質濃度の有意な増加するが、これは時間とともに減少することを示す。しかし、心外膜アブレーションを受けた患者では、血漿中のMYBPHLタンパク質濃度は、心内膜アブレーションを受けた患者の血漿中のすべての術後測定時点のMYBPHLタンパク質濃度より高いレベルに到達することはなかった。これは、MYBPHLタンパク質濃度がより侵襲的な心内膜アブレーションを受けた患者の方が高いため、MYBPHLタンパク質濃度と現在の心房心筋損傷の感度と相関関係を示す。
急性ST上昇型心筋梗塞に罹患している患者のMYBPHL血漿濃度
急性ST上昇型心筋梗塞を示した患者群で、MYBPHLタンパク質濃度を測定した。図8は、血漿試料中のMYBPHLタンパク質濃度の測定結果を示す。血液試料は、介入前と介入後72時間の2つの測定時点で採取された。介入は心臓カテーテルによって行われた。急性ST上昇型心筋梗塞の病状により、この群の患者は、図8に示すように、心房の心臓損傷に加えて明確な心室損傷を患い、測定時点1、例えば介入の前に、最高のMYBPHL血漿濃度が見られる。このMYBPHL血漿濃度は、心外膜メイズで治療された患者に見られるMYBPHL血漿濃度と同様である。介入の72時間後、MYBPHL血漿濃度は、患者がメイズで治療される前(図5及び図6a)又は健常な被験者で、実施例3で得られたものと同様の値に減少した。この試験のデータは、MYBPHL血漿濃度が急性心筋損傷の場合に顕著に増加し、時間とともに減少して、病態がもはや存在しなくなると正常値に達することを示す。
心房心筋組織損傷における、特異的バイオマーカーMYBPHLのタンパク質濃度と既知の非特異的バイオマーカーCK−MBのタンパク質濃度の間の比例性
図9Aは、実施例2と同じ患者群から得られた血清試料中のCK−MBタンパク質濃度の測定結果を示す。図9Bは、図9Aによる血清試料中のCK−MBタンパク質濃度の変化倍率を示す。MYBPHLと比較して、CK−MBタンパク質濃度は測定時点2でも最大値に達した。この測定時点2において、CK−MBタンパク質濃度は、アブレーション前のCK−MBタンパク質濃度の15倍高い。
バイオマーカーMYBPHLの変化倍率とバイオマーカーFHL−2の変化倍率を使用した心房心筋組織損傷と心室心筋組織損傷の区別
図11は、MYBPHLの変化倍率とFHL−2の変化倍率の比率を示す。表示の左側の2列には、ST上昇型心筋梗塞に罹患している患者の結果が示され、表示の右側の6列には、心房細動に罹患してアブレーションを受けている患者の結果が示されている。MYBPHLの変化倍率とFHL−2の変化倍率の比率は、心房アブレーションを受けた患者では2まで増加する。逆に、ST上昇型心筋梗塞、例えば心室心筋組織損傷に罹患している患者に対する介入の前後で、MYBPHLの変化倍率とFHL−2の変化倍率の比率は、約1で安定したままである。
Claims (14)
- 患者の心筋組織損傷、好ましくは心房心筋組織損傷を診断する方法であって、前記方法は、
(a)患者から得られた試料中の、MYBPHL及びそのアイソフォームからなる群より選択される心房心筋組織損傷のバイオマーカーのレベルを測定する工程;及び
(b)工程a)で測定されたレベルを、対照個体で観察された心房心筋組織損傷のバイオマーカーのレベルと比較する工程を含み、
ここで、工程a)で測定されたレベルが、対照個体中の心房心筋組織損傷のバイオマーカーのレベルと比較して増加している場合、前記患者は心筋組織損傷を有すると診断される、上記方法。 - 前記MYBPHLのアイソフォームが、MYBPHLアイソフォーム1及びMYBPHLアイソフォーム2からなる群より選択される、請求項1に記載の方法。
- 前記MYBPHLアイソフォーム1及びMYBPHLアイソフォーム2が、配列番号3又は6に記載のアミノ酸配列、又は全長にわたってそのアミノ酸配列と少なくとも70%の配列同一性を有するそのホモログを有する、請求項2に記載の方法。
- 工程(a)において、心房心筋損傷の1つ以上の追加のバイオマーカーのレベルが測定され、そして、工程(b)において、工程a)において測定された前記バイオマーカーのレベルが、対照個体におけるそれぞれのマーカーのレベルと比較される、請求項1〜3のいずれか1項に記載の方法であって、
前記バイオマーカーが、MYBPH、MYOT、ASNSD1、CHFR、NTN1、RFC5、POLI、COMP、POF1B、PLA2G2A、HDAC10、ASPG、FMOD、CA13、CACNA2D2、GNL3L、COL2A1、PDLIM4、LEPREL1、OMD、DGKZ、NT5DC2、ITLN1、NTM、PRKG2、CHGB、FAM179A、CKMT1A、CKMT1B、LTBP3、SGSM1、METTL7B、LTBP2、OGDHL、PAM、SBK3、SFRP1、及びそれらのアイソフォームから選択される、上記方法。 - 前記方法が、前記患者における心筋組織損傷の程度を測定することをさらに含む、請求項1〜4のいずれか1項に記載の方法であって、心筋損傷の程度は、前記患者から得られた試料中の心房心筋組織損傷のバイオマーカーのレベルと、対照個体における心房心筋組織損傷のバイオマーカーのレベルとの比率を決定することによって評価される、上記方法。
- 前記方法は、(c)前記患者の試料において、心筋組織損傷の追加のバイオマーカーのレベルを測定することをさらに含み、前記方法は心房筋組織損傷と心室筋組織損傷とを区別するのに適している、請求項1〜5のいずれか1項に記載の方法。
- 請求項6に記載の方法であって、前記追加のバイオマーカーが、心室心筋組織損傷に特異的なバイオマーカー、好ましくはFHL−2、SMYD2、FASTKD1、PRR33、SORBS2、CRISPLD1、NPHP4、ANKRD2、TMEM159、ATP7A、C12ORF73、NAV1、ATP5B、HSPB7、TMEM88、WDR62、ACTN3、TRIM72、EGFLAM、LRRC39、DPYSL4、PFKFB2、ABCB6、METTL2B、METTL2A、CARNS1、SPTBN1、又はそのアイソフォームである、上記方法。
- 前記追加のバイオマーカーが、好ましくはCK−MB又はトロポニンからなる群より選択される、心筋組織損傷の一般的なバイオマーカーである、請求項1〜6のいずれか1項に記載の方法。
- 前記試料が血清又は血漿である、請求項1〜8のいずれか1項に記載の方法。
- 前記患者がヒトである、請求項1〜9のいずれか1項に記載の方法。
- 前記バイオマーカーのレベルを測定することが、バイオマーカーのタンパク質濃度を測定することを含む、請求項1〜10のいずれか1項に記載の方法。
- 前記タンパク質濃度が、イムノアッセイ、ELISA、質量分析、クロマトグラフィー、ウエスタンブロット、又はゲル電気泳動によって測定される、請求項11に記載の方法。
- 請求項6〜12のいずれか1項に記載の方法で使用するためのキットであって、試料中の、心房心筋組織損傷のバイオマーカーのレベルを測定するための試薬と、心筋損傷の追加のバイオマーカーのレベルを測定するための試薬とを含む、上記キット。
- 請求項6〜12のいずれか1項に記載の方法で使用するための、心房心筋組織損傷のバイオマーカーと心筋損傷の追加のバイオマーカーとを含む、マーカーパネル。
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