JP6170143B2 - 血液試料中のタンパク質分解カスケードのペプチド分解産物の測定方法 - Google Patents
血液試料中のタンパク質分解カスケードのペプチド分解産物の測定方法 Download PDFInfo
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- JP6170143B2 JP6170143B2 JP2015515397A JP2015515397A JP6170143B2 JP 6170143 B2 JP6170143 B2 JP 6170143B2 JP 2015515397 A JP2015515397 A JP 2015515397A JP 2015515397 A JP2015515397 A JP 2015515397A JP 6170143 B2 JP6170143 B2 JP 6170143B2
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- bradykinin
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Description
本明細書で用いる用語「保存」、「安定化」、「凍結」および「クエンチ」は、生化学状態の保存、たとえばタンパク質分解の阻害などによる、ペプチドレベルの保存などを意味する。定常状態平衡ペプチドレベル(またはインビボペプチドレベル)の安定化は、1種以上のプロテアーゼ阻害剤の添加、特に、プロテアーゼ阻害剤カクテルの添加によって行うことができる。したがって、1種以上のプロテアーゼ阻害剤は、少なくとも1つのペプチド分解産物について定常状態平衡が達成されるまでインキュベーション後に添加されてもよい。適当なプロテアーゼ阻害剤またはその組合せは、当業者によって選択されうるものであり、たとえば、特異的または非特異的酵素阻害剤の組合せ、あるいはそれらの組合せを含んでよい。1種以上のプロテアーゼ阻害剤またはプロテアーゼ阻害剤カクテルは、特に、対象のカスケードのタンパク質分解ステップ(すなわち、測定されるペプチドを形成または分解する酵素)またはタンパク質分解カスケードの各酵素が、完全に阻害されるのを確実にする。
ts=(cf−cmin)/Vf
ts 供給基質濃度に基づく安定時間[時間]
cf 供給基質濃度[mol/L]
cmin 試料中の供給酵素の最大代謝回転速度を達成するための試料特異的最小基質濃度[mol/L]
Vf カスケードの供給速度[[mol/L]/[時間]]
および
cmin=f・cE
f 過剰因子
cE 供給酵素濃度
材料:
C18カートリッジ:Sep-Pak Vac 3cc(500mg)、Waters
質量分析計:Q TRAP4000-Applied Biosystems
HPLCシステム: 1100シリーズ、Agilent
C18 RP-HPLCカラム:Luna 3u C18(2)100A、100x2.00mm、(Phenomenex、カタログ番号00D-4251-B0)
無水エタノール(Merck、カタログ番号100983)
メタノール(Fluka、カタログ番号14262)
水、LiChrosolv(Merck、カタログ番号115333)
アセトニトリル、LiChrosolv(Merck、カタログ番号114291)
ギ酸、>98%(Fluka、カタログ番号06440)
Z-Arg、レニン阻害剤として(Bachem、C-3195)
ペプスタチンA(Bachem(N-1125)
p-ヒドロキシメルクリ安息香酸ナトリウム塩(Fluka、55540)
1,10-フェナントロリン一水和物(Sigma、P9375)
リシノプリル(Sigma、L6394)
カプトプリル(Sigma、C4043)
アマスタチン・HCl、(Bachem、N-1410)
ACE、NEPおよびAPNは、R&D Systemsから購入した。
rhACE2(組換え可溶性ヒトACE2)は、Apeiron Biologicsから購入した。
EDTA(Sigma)
GTC(Sigma、カタログ番号G9277)
トリフルオロ酢酸(TFA)(Sigma-Aldrich、カタログ番号302031)
生物試料中のペプチドの絶対的定量に用いる内部標準は合成ペプチドであり、それらの配列はペプチド分析物と同一であり、LC-MS/MS分析において、外部からのペプチドと標準ペプチドの間の区別を可能にする質量ラベルでタグ付された。これらの合成ペプチドの物理化学的特性が同一であることによって、それらは、それらの対応するペプチド分析物と比較して、試料処理中に同一の挙動および回収を示す、少量のペプチド定量のための理想的な内部標準になる。内部標準は、すべての操作誘発性バリエーションを考慮して、血液採取中または直後に、試料に加えられた。ペプチド回収は、異なるペプチドと個々の試料の間で異なるので、ペプチド特異的内部標準の使用が、推奨されうる。
本発明による血液試料中のタンパク質分解カスケード分解産物の分析(RSSEフィンガープリント)
RSSE-フィンガープリント法:
血液試料を採取し、標準ヘパリン採血管(BD)で抗凝固処理した。図3に示すように、インキュベーションが定常状態平衡を達成する前に各資料について血漿分離を行った。37℃の水浴中で、図1に示す時間の血液または血漿試料のインキュベーションを行った後、または図2、3および4については2時間のインキュベーションを行った後、試料を氷上で冷却し、次いで、ペプスタチンA、1,10-フェナントロリン、EDTA、p-ヒドロキシメルクリ安息香酸およびZ-Arg、ならびに内部標準を含む定常状態平衡保存プロテアーゼ阻害剤カクテルの即時添加を行った。
4℃にて10分間の3000 rcfでの遠心分離による血漿分離に続いて、0.2〜2 mlの血漿を活性化し、平衡化したSep-Pak C18カートリッジに適用した。1 mlの水で3回洗浄することによって、試料マトリックス成分を除去した。次いで、結合した分析物を1 mlのメタノールで溶離した。溶出液を蒸発乾固し、0.1%ギ酸を補足した10%アセトニトリル/90%水で再構成し、次いで、LC-MS/MS分析に付した。
真空マニホールドを用いて試料を処理した。
1.活性化:無水EtOH
2.平衡:2 x 1ml H2O
3.ローディング:0.2〜1ml安定化血漿
4.洗浄:3 x 1 ml H2O
5.溶離:1ml MeOH
Applied Biosystemsが提供するAnalyst 1.5.1ソフトウェアを用いて、MRMクロマトグラムを積分した。定量限界のための閾値は、シグナル:ノイズ比10にて設定した。この比に達しない積分シグナルは、ゼロに設定した。分析物シグナルを、内部標準シグナルに関連させ、内部標準の最初に急上昇した量(spiked amounts)から濃度を計算した。
アンジオテンシンペプチド濃度に関するRASの評価は、試料採取および試料保存ために用いた条件に大きく依存する。血液試料中のインビボならびにエクスビボ定常状態平衡アンジオテンシンペプチドレベルを有効に保存し、次いで、高感度LC-MS/MS-分析および絶対的定量を行うことができる分析システムが創設された。
本発明による血液試料中のレニン-アンジオテンシン系ならびにブラジキニン系のタンパク質分解カスケード分解産物の分析
即時あるいは水浴中37℃にて1時間または3時間のインキュベーション後のいずれかに血漿試料が4M GTC/1% TFAの添加によって安定化される以外は、実施例Iに記載のとおりすべての方法を行った。
結果:
図6および7は、本発明方法が、RASのみならず、ブラジキニン系などの他のタンパク質分解カスケードにも適用されうることを示す。さらに、これらの図面は、定常状態平衡が、プロテアーゼ阻害剤カクテルの添加によってのみならず、GTCなどのカオトロピック剤によって効率的に安定化されうることを示す。1時間のインキュベーションと3時間のインキュベーションのペプチドレベルの比較から明らかなように、1時間のインキュベーション期間の後、RASおよびブラジキニン系について定常状態平衡が達成され、安定性は維持される。
Claims (17)
- 生物試料中の少なくとも2つの連続したタンパク質分解反応を含むタンパク質分解カスケードのペプチド分解産物の測定方法であって、試料が、少なくとも1つのペプチド分解産物の実際の全体的分解速度が、該少なくとも1つのペプチド分解産物の実際の全体的形成速度に等しく、該タンパク質分解カスケードに関与する該少なくとも1つのペプチド分解産物に対して定常状態平衡が達成されるまでインキュベートされ、定常状態平衡濃度における該少なくとも1つのペプチド分解産物が、試料中で定量される方法。
- 該試料が血液試料である請求項1に記載の方法。
- 該血液試料が全血、血漿または血清である請求項2に記載の方法。
- 該血液試料が新鮮または凍結抗凝固全血または新鮮または凍結抗凝固血漿である請求項3に記載の方法。
- タンパク質分解カスケードの少なくとも2つ、少なくとも3つまたは少なくとも4つのペプチド分解産物が、定常状態平衡濃度において試料中で定量される請求項1〜4のいずれか1つに記載の方法。
- 少なくとも2つのペプチド分解産物が定量され、少なくとも2つのペプチド分解産物の定常状態平衡定量の比が計算される請求項5に記載の方法。
- 試料が、15分、20分、25分、30分、60分、90分、120分、150分、180分、210分、240分、270分まで、または300分までインキュベートされる請求項1〜6のいずれか1つに記載の方法。
- 試料が、30〜50℃、35〜40℃、または約37℃の温度にてインキュベートされる請求項1〜7のいずれか1つに記載の方法。
- タンパク質分解カスケードが、レニン-アンジオテンシン系(RAS)またはブラジキニン系またはその両方である請求項1〜8のいずれか1つに記載の方法。
- ペプチド分解産物が、アンジオテンシノーゲン、アンジオテンシンI(Ang 1-10)、アンジオテンシン2-10(Ang 2-10)、アンジオテンシンII(アンジオテンシン1-8またはAng 1-8)、アンジオテンシンIII(アンジオテンシン2-8またはAng 2-8)、アンジオテンシンIV(アンジオテンシン3-8またはAng 3-8)、アンジオテンシン1-9(Ang 1-9)、アンジオテンシン1-7(Ang 1-7)、アンジオテンシン2-7(Ang 2-7)、アンジオテンシン3-7(Ang 3-7)、アンジオテンシン1-5(Ang 1-5)、カリジン(KDまたはLys-ブラジキニン)、ブラジキニン1-9(BK 1-9)、ブラジキニン2-9(BK 2-9)、ブラジキニン1-8(BK 1-8)、ブラジキニン1-7(BK 1-7)およびブラジキニン1-5(BK 1-5)から選ばれる請求項1〜9のいずれか1つに記載の方法。
- 定量されるペプチド分解産物が、アンジオテンシンI(1-10)、アンジオテンシンII(アンジオテンシン1-8またはAng 1-8)、アンジオテンシン1-7(Ang 1-7)およびアンジオテンシン1-5(Ang 1-5)である請求項1〜10のいずれか1つに記載の方法。
- 定量されるペプチド分解産物が、アンジオテンシンII(アンジオテンシン1-8またはAng 1-8)、アンジオテンシン1-7(Ang 1-7)およびアンジオテンシン1-5(Ang 1-5)である請求項1〜10のいずれか1つに記載の方法。
- 定量されるペプチド分解産物が、ブラジキニン1-9(BK 1-9)、ブラジキニン1-8(BK 1-8)、ブラジキニン1-7(BK 1-7)およびブラジキニン1-5(BK 1-5)である請求項1〜10のいずれか1つに記載の方法。
- 定量されるペプチド分解産物が、ブラジキニン1-8(BK 1-8)、ブラジキニン1-7(BK 1-7)およびブラジキニン1-5(BK 1-5)である請求項1〜10のいずれか1つに記載の方法。
- 1種以上のプロテアーゼ阻害剤が、少なくとも1つのペプチド分解産物について定常状態平衡が達成されるまでインキュベーション後に添加される請求項1〜14のいずれか1つに記載の方法。
- 少なくとも1つの定常状態平衡のペプチドレベルが、少なくとも30分、60分、90分、120分、150分、180分、210分、240分、270分または300分の時間にわたって、15%、14%、13%、12%、11%、10%、9%、8%、7%、6%、5%、4%、3%、2%または1%以上変化しない請求項1〜15のいずれか1つに記載の方法。
- 少なくとも2つのタンパク質分解反応の少なくとも1つが供給酵素によって行われ、該供給酵素がタンパク質分解反応の律速段階であり、代謝回転速度を有し、該供給酵素の代謝回転速度が、少なくとも30分、60分、90分、120分、150分、180分、210分、240分、270分または300分の時間にわたって、15%、14%、13%、12%、11%、10%、9%、8%、7%、6%、5%、4%、3%、2%または1%以上変化しない請求項1〜15のいずれか1つに記載の方法。
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- 2012-06-06 AU AU2012381805A patent/AU2012381805B2/en active Active
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HK1209181A1 (en) | 2016-03-24 |
HUE047261T2 (hu) | 2020-04-28 |
CN104395750A (zh) | 2015-03-04 |
EA201401335A1 (ru) | 2015-04-30 |
DK2859343T3 (da) | 2019-12-09 |
ZA201406497B (en) | 2015-12-23 |
CA2875625A1 (en) | 2013-12-12 |
US20170285048A1 (en) | 2017-10-05 |
US11079398B2 (en) | 2021-08-03 |
AU2012381805A1 (en) | 2014-09-25 |
PL2859343T3 (pl) | 2020-05-18 |
CN104395750B (zh) | 2017-06-30 |
JP2015518964A (ja) | 2015-07-06 |
US20150050676A1 (en) | 2015-02-19 |
WO2013182237A1 (en) | 2013-12-12 |
EP2859343B1 (en) | 2019-10-23 |
ES2755928T3 (es) | 2020-04-24 |
EP2859343A1 (en) | 2015-04-15 |
EA034043B1 (ru) | 2019-12-20 |
BR112014025559A2 (pt) | 2017-07-04 |
EP3647790A1 (en) | 2020-05-06 |
NZ630182A (en) | 2016-07-29 |
US9684004B2 (en) | 2017-06-20 |
AU2012381805B2 (en) | 2018-09-20 |
CA2875625C (en) | 2021-06-22 |
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