JP2014140374A - 敗血症症候群の診断及び/又は予後診断方法 - Google Patents
敗血症症候群の診断及び/又は予後診断方法 Download PDFInfo
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Abstract
【解決手段】a.生物材料を生物試料から抽出する工程、b.生物材料を、特定な配列からなる核酸配列を有する標的遺伝子に特異的な試薬から選択される4個の特異的試薬と接触させる工程、c.前記標的遺伝子の4個の発現を分析する工程、d.前記標的遺伝子の発現が、予後が良好な患者に由来する生物材料に比較して増加した場合、予後が不良であると判定する工程、を含む、患者に由来する生物試料に基づく敗血症症候群の診断/予後診断方法。
【選択図】なし
Description
・例えば、敗血症は、感染に関係する炎症性の全身反応である、
・重症敗血症は、少なくとも1つの臓器の機能不全を伴う敗血症である、
・敗血症ショックは、持続する低血圧症を伴い、以下によって定義することができる重症敗血症である:
○特定の感染部位の存在、
○以下の兆候の少なくとも3つによって現れる全身性の炎症反応:a)体温が38℃より高いか又は36℃より低い;b)心拍が1分間に90回より多い;c)呼吸速度が1分間に20回より遅い;d)白血球数が12,000個/mm3より多いか又は4,000個/mm3より少ない、
○適切な充填(filling)とバソプレッシン処理をしたにもかかわらず、低血圧症が持続する。
a.核酸を含む生物材料を生物試料から抽出する工程、
b.生物材料を、配列番号1、5、11、及び16のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な試薬から選択される4個の特異的試薬と接触させる工程、
c.前記標的遺伝子の4個の発現を分析する工程、及び
d.配列番号1、5、11、及び16の核酸配列を有する標的遺伝子の発現が、予後が良好な患者に由来する生物材料と比較して増加した場合に、予後不良であると判定する工程:
を含むことを特徴とする、
敗血症症候群の予後の判定方法に関する。
以下の工程:
a.生物材料を生物試料から抽出する工程、
b.生物材料を、配列番号1〜28のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な試薬から選択される少なくとも1つの特異的試薬と接触させる工程、
c.上記標的遺伝子の少なくとも1つの発現を判定する工程:
を含むことを特徴とする
患者に由来する生物試料に基づく敗血症症候群の診断/予後診断方法
に関する。
−患者の細胞に含まれる核酸を放出させるために、生物試料中に存在している細胞を溶解させることからなる工程。
例えば、複数の特許出願に記載されているような溶解の方法を使用することができる:
○磁気による溶解と機械的溶解の組み合わせに関するWO00/05338
○電気的溶解に関するWO99/53304
○機械的溶解に関するWO99/15321。
−溶解工程で放出された他の細胞構成要素から核酸を分離するための精製工程。概してこの工程では核酸の濃縮が可能であり、かつ、この工程はDNA又はRNAの精製に利用することができる。例えば、吸着又は共有原子価により必要に応じてオリゴヌクレオチドでコーティングされた磁性粒子(この点で、米国特許第4,672,040号及び米国特許第5,750,338号を参照のこと)を使用可能であり、例えば、この磁性粒子に付着する核酸は洗浄工程によって精製することができる。引き続いて上記核酸の増幅が望まれる場合に、この核酸精製工程は特に有利である。この磁性粒子の特に有利な実施形態は、特許出願WO−A−97/45202及びWO−A−99/35500に記載される。核酸の精製方法の別の有利な例は、カラムの形態での、又は、不活性粒子(Boom Rら、J.Clin.Microbiol.、1990、n°28(3)、p.495〜503)若しくは磁性粒子(Merck社:MagPrep(登録商標)Silica,Promega社:MagneSil(商標)常磁性粒子)の形態でのシリカの使用である。これ以外に、カラムにおける、又は、常磁性粒子型(Whatman社:DEAE−magarose)(Levison PRら、J.Chromatography、1998、p.337〜344)におけるイオン交換樹脂に基づく方法も非常に広範に使用される。本発明に大いに関連している別の方法は、金属酸化物支持体(Xtrana社:Xtra−Bind(商標)マトリックス)への吸着であるが、これに限定されない。
− 例えば欧州特許出願第0201184号に開示されるLCR(リガーゼ連鎖反応);
− 国際特許出願WO90/01069に記載されるRCR(修復連鎖反応(repair chain reaction));
− 国際特許出願WO90/06995による3SR(自立配列複製(self sustained sequence replication));
− 国際公開WO91/02818によるNASBA法(核酸配列増幅法)
− 米国特許第5399491号によるTMA法(転写介在増幅法)。
以下の工程:
a.生物材料を生物試料から抽出する工程、
b.生物材料を、配列番号1〜28のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な試薬から選択される少なくとも28個の特異的試薬と接触させる工程、
c.上記標的遺伝子の少なくとも28個の発現を判定する工程:
を含むことを特徴とする
上記で定義された方法にも関する。
以下の工程:
a.生物材料を生物試料から抽出する工程、
b.生物材料を、配列番号1、3、7、9〜15及び17〜28のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な試薬から選択される少なくとも22個の特異的試薬と接触させる工程、
c.上記標的遺伝子の少なくとも22個の発現を判定する工程:
を含むことを特徴とする
患者に由来する生物試料に基づく敗血症症候群の診断/予後診断方法に関する。
添付の図面は説明用の例示であって、本質的に何ら限定的なものではない。これによって、本発明をより完全に理解することが可能となるであろう。
生物試料の特性;敗血症症候群を発症している、Lyon−Sud hospital centerの外科又は内科集中治療室の患者について研究を行った。研究に含めるためには、患者は以下の基準を満たしている必要があった:年齢が18歳を超える;先に記載したコンセンサス会議による敗血症ショックの存在;併存疾患(転移性のガン、悪性血液疾患、I型糖尿病、慢性的な肝臓病理、慢性腎不全、AIDS)がないこと。研究の目的は、敗血症ショックによって誘導される遅発性死亡を研究することであったので、症候群の最初の48時間の間に死亡した患者は研究から除外した。実施した全ての患者について処置は同じとした。
b:中央値(Q1−Q3)
COPD:慢性閉塞性肺疾患
試料を、PAXGene(登録商標)Blood RNAチューブ(PreAnalytix社 アメリカ合衆国フランクリンレイクス)の中に直接回収した。血液試料を採取して細胞の全溶解物を得る工程の後、チューブを室温に4時間置き、その後、生物材料の抽出までの間、−20℃で保存した。より具体的には、このプロトコルでは、製造業者による推奨を見てPAXGene Blood RNA(登録商標)キット(PreAnalytix社)を使用して、総RNAを抽出した。簡単に説明すると、チューブを遠心分離して(10分間、3000g)、核酸のペレットを得た。このペレットを洗浄し、タンパク質の消化に必要なプロテイナーゼKを含むバッファー中に取った(10分間、55℃)。さらに遠心分離(5分間、19,000g)して細胞の破片を除去し、エタノールを添加して核酸結合条件を最適化した。総RNAは、PAXGene RNAスピンカラムに特異的に結合し、そしてその後の溶出の前に、混入しているDNAの消化をRNAseを含まないDNAseセット(キアゲン社、英国クローリー)を使用して行った。総RNAの性質をAGILENT 2100バイオアナライザー(Agilent Technologies社,ドイツ国Waldbronn)を用いて分析した。総RNAには、トランスファーRNA,メッセンジャーRNA(mRNA)及びリボソームRNAが含まれている。
これについては、それぞれの試料に由来する20μgの断片化cRNAをハイブリダイゼーションバッファー(アフィメトリクス社)に添加し、この溶液200μlを、発現用チップ(Human Genome U133A GeneChip(登録商標)(アフィメトリクス社))と45℃で16時間接触させた。発現用チップには、アフィメトリクス社のインターネットサイト上に記載されているアフィメトリクス社のプロトコルにしたがって、およそ14500個の遺伝子を提示する22283グループのプローブが含まれている。ハイブリダイゼーション及び洗浄能力を最良とするために、ビオチン化した(bioB、bioC、bioD及びcre)「対照」RNAと記載されるRNAとオリゴヌクレオチド(オリゴB2)とをハイブリダイゼーションバッファーの中に含めた。ハイブリダイゼーション工程の後、チップ上にハイブリダイズしたビオチン化cRNAの溶液を、ストレプトアビジン−フィコエリスリンの溶液を使用して視覚化し、その後、シグナルを抗ストレプトアビジン抗体を使用して増幅した。ハイブリダイゼーションは、「GeneChipハイブリダイゼーションオーブン」(アフィメトリクス社)において実施し、アフィメトリクス社のプロトコルのEuk GE−WS2V4プロトコルにしたがった。洗浄と視覚化の工程は、「Fluidics Station 450」(アフィメトリクス社)を用いて行った。続いて、それぞれのU133AチップについてAgilent G2500A GeneArray Scannerを用いて解像度3ミクロンで分析し、チップ上でハイブリダイズした領域を正確に示した。このスキャナーを用いることによって、落射蛍光顕微鏡技術を使用してアルゴンレーザーで励起させた後に、蛍光分子によって放射されるシグナルを検出することが可能となる。このようにして、結合したcRNAの量に比例するシグナルを、それぞれの点について得た。続いて、シグナルをMicroarray Suite 5.0ソフトウェア(MAS5.0、アフィメトリクス社)を使用して分析した。
−全ての患者において発現していない遺伝子を排除した(MAS5.0ソフトウェア);
−蛍光中央値が2つのグループにおいて30未満であった遺伝子を排除した;
−2つのうち1つのグループにおいて患者の少なくとも30%において発現していなかった遺伝子を排除した;
−GP患者とPP患者の間での発現中央値の比が0.77〜1.3であった遺伝子を排除した。
別の分子生物学的技術によってこれらの結果を確認するために、特定の遺伝子を定量的RT−PCRによってアッセイした。簡単に説明すると、逆転写(RT)反応を最終容量20μlで行った。総RNA(1μg)を1μlのポリTと共に、50μM及び1μlのdNTP混合物(ThermoScript(登録商標)RT−PCRシステム、Invitrogen社)で混合し、その後、65℃で5分間インキュベートした。氷中での冷却の後、溶液を、4μlの5×cDNA合成バッファー、1μlのRNAse out(40U/μl)、1μlのDEPC処理水、及び、1μlのThermoscript RT(15U/μl)(これらの製品は全て、ThermoScript(登録商標)RT−PCRシステム(Invitrogen社)による)と混合した。逆転写を50℃で1時間行い、その後、85℃で5分間インキュベートすることによって停止させた。最後に、cDNA溶液のそれぞれを、DEPC水溶液中に1/10になるように希釈した。
配列番号1、5、11及び16の標的遺伝子のmRNAを、LightCycler(登録商標)(Roche社)を使用して定量的リアルタイムPCRによって定量した。PCR反応は、Fast−Start(登録商標)DNA Master SYBR Green IリアルタイムPCRキット(Roche Molecular Biochemicals)を使用して行った。個々のPCRは、1μlのLC−Fast Start Reaction Mix SYBR Green I、1μlのLC−Fast Start DNA Master SYBR Green I/Enzyme(Taq DNAポリメラーゼ、反応バッファー及びデオキシヌクレオチド3リン酸混合物を含む)、MgCl2(最終濃度3mM)、センスプライマーとアンチセンスプライマー(最終濃度0.5μM)、並びに、10μlのcDNA溶液を含む、最終容量20μlで行った。95℃で10分間の変性工程の後、増幅を、40サイクルの「タッチダウン」PCRプロトコル(95℃で10秒間、68〜58℃での10秒間のハイブリダイゼーション、その後に、72℃で16秒間の伸張)によって行った。それぞれのサイクルの終わりに、SYBR Greenによって放射された蛍光を測定した。
本発明者らはまた、いくつかの遺伝子の発現の同時分析がGP患者とPP患者を区別することに極めて関連性が深いことも明らかにした。
Claims (6)
- 以下の工程:
a.核酸を含む生物材料を生物試料から抽出する工程、
b.生物材料を、配列番号1、5、11、及び16のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な試薬から選択される4個の特異的試薬と接触させる工程、
c.前記標的遺伝子の4個の発現を分析する工程、及び
d.配列番号1、5、11、及び16の核酸配列を有する標的遺伝子の発現が、予後が良好な患者に由来する生物材料と比較して増加した場合に、予後不良であると判定する工程:
を含むことを特徴とする、
敗血症症候群の予後の判定方法。 - 生物試料は血液試料である
ことを特徴とする請求項1に記載の判定方法。 - 工程b.の特異的試薬は、少なくとも1つのハイブリダイゼーションプローブを含む
ことを特徴とする請求項1又は2に記載の判定方法。 - 前記少なくとも1つのハイブリダイゼーションプローブは基体上に固定されている
ことを特徴とする請求項3に記載の判定方法。 - 敗血症症候群の予後を判定するための、配列番号1、5、11、及び16のいずれか1つを有する核酸配列を有する標的遺伝子に特異的なプローブから選択される4個のハイブリダイゼーションプローブを有する基体の使用。
- 敗血症症候群の予後を判定するための、配列番号1、5、11、及び16のいずれか1つを有する核酸配列を有する標的遺伝子に特異的な4個の試薬の使用。
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CN110191960A (zh) | 2016-11-08 | 2019-08-30 | 克维拉公司 | 进行核酸稳定和分离的方法 |
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