JP4954348B2 - Cfhまたはapohを急性骨髄性白血病寛解診断用生化学的マーカーとして使用する方法 - Google Patents
Cfhまたはapohを急性骨髄性白血病寛解診断用生化学的マーカーとして使用する方法 Download PDFInfo
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- JP4954348B2 JP4954348B2 JP2011510438A JP2011510438A JP4954348B2 JP 4954348 B2 JP4954348 B2 JP 4954348B2 JP 2011510438 A JP2011510438 A JP 2011510438A JP 2011510438 A JP2011510438 A JP 2011510438A JP 4954348 B2 JP4954348 B2 JP 4954348B2
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Description
(実験方法)
1.患者、検体、化学療法後応答基準
本発明で使用された血清検体は、3次医療機関である全南大学校病院の造血系遺伝体研究センター(GRCHD)から得た。臨床情報は、チャート検討により得られて、全ての診断は、骨髄生体組織検査により組織学的に確認された。骨髄サンプルの収集の間、全ての患者は、検査後の検体が研究のための目的で使用されることに対する許可を求める同意書が提供されて、この研究は、臨床試験審議委員会で審議されて通過された。血清サンプルは、氷上で直ちに実験室に移動されて、遠心分離後分株して、使用前まで-80℃で凍結した。
33名の患者のPreCRとCR血清サンプルを30μlずつ混ぜて、それぞれ約1mlの混合されたPreCR血清とCR血清を得た。albuminとIgGのように大量存在する蛋白質は、それぞれの混合された血清サンプルから、提供された使用法にしたがってmultiple affinity removal system(MARS; Agilent technologies, SanDiego, CA)を利用して除去した。Flow-through fraction(PreCRとCR)は、5000molecular weight cut off濃縮機で濃縮した。濃縮されたサンプルは、定量後、1mgの蛋白質を取ってlysis buffer(30mM Tris [pH8.5], 8M urea, 4% CHAPS)を利用して1mlの容量に調整して、氷上に置いた。Cy3とCy5 dyeは、それぞれ混合されたPreCRとCRサンプルの標識化に使用された。簡単に言えば、Cy dyeは、0.4mM(400pmol/ul)の濃度になるようにN,N-dimethylformamideに溶かして、Cy dye :蛋白質比率が400pmol : 50ugになるように反応させた(1mgの蛋白質当たり20ulのCy dye)。Lysine残基のアミノグループのCy dye標識化反応は、氷上で30分間暗反応で進行した。反応は、10mM l-lysine 20ulを添加した後、10分間反応して終結した。Cy3とCy5で標識化された血清蛋白質は混ぜた後、アルミニウムホイルで包んで、使用前まで-80℃に凍結した。
Cy dye標識化された蛋白質混合物の分離とその後の調査に対する手順図は、図1に提示された。混合された1対の血清蛋白質サンプルは、ProteomeLab HPLC system(Beckman Coulter, Fullerton, CA)を利用してchromatofocusing (CF) chromatography(Tricorn High Performance Columns, Mono P 5/200GL System; Amersham Biosciences, Wikstr, Sweden)を通じて1次分離をした。UV検出器波長は、280nmであり、蛋白質分離は、pH間隔0.2に9.0-4.0のpH範囲でなされた。CFカラムは、1ml/minの流速のBuffer A(0.075 M Tris [pH 9.3])を20-30分間流して平衡化させた。2mlの混合された血清蛋白質がカラムに注入された。0.5ml/minの流速で10分間Buffer Aがカラムを通過して、付着された蛋白質は、0.5ml/minの流速で40分間流れるBuffer B (Polybuffer 74, pH 4.0; Amersham Biosciences)により溶出された。その後、カラムは、0.5ml/minの流速で30分間流れるBuffer C(1M NaCl)と同一流速で30分間流れるBuffer D(ddH2O)で洗浄した。全体的に8個fractionが分離されたvialに集まれて、使用前まで4℃に保管された。
Gelは、9200 Typhoon Scanner(GE Healthcare, Chalfont St. Giles, UK)を利用してスキャンされた。Cy3とCy5標識化された蛋白質バンドは、Typhoon Scanner Control softwareを通じてCy3 channel 532nm, PMT(photomultiplier tube) 510V; Cy5 channel 633 nm, PMT 490Vの条件でスキャンされた。スキャンされたイメージは、ImageQuant TL software(GE Healthcare)を通じて分析した。
LC-MS/MS分析は、高いCy dye蛍光比率を示すバンド(Coomassie blueで染色)の蛋白質同定のためになされた。まず、蛋白質をトリプシンで加水分解する前に、DTTでreduction後、indole-3 acetic acid (IAA)でalkylationした。サンプルは、10mM ammonium bicarbonateと50% ACNで洗浄して、50mM ammonium bicarbonateと5mM CaCl2, 1ug of trypsinで構成されたdigestion bufferを入れた後、37℃で16時間反応した。ペプチドは、50mM ammonium bicarbonateと100% ACNで2回の抽出過程により回収された。それぞれのバンドに対するペプチド抽出物は、凍結乾燥後、MS分析をする前まで20℃で保管された。
一つのゲルバンドは、普段様々な他の蛋白質を含んでいる。ところが、蛍光の色は、一つまたは幾つかの支配的な蛋白質により影響を受けるように見える。それぞれのバンドにおいて支配的な蛋白質の同定のために、MASCOT検索結果からexponentially modified protein abundance index(emPAI)を評価した。emPAIは、tandem mass spectrometryにより同定された蛋白質のペプチドシーケンスの数からその濃度の推定を提供する。emPAI値は、tandem mass spectrometryで測定されたペプチドの数と蛋白質のアミノ酸シーケンスから予測されたペプチドの数との間の比率で定義されるprotein abundance index(PAI)の改善を示す。PAIは、tandem mass spectrometryを使用して作られたデータベース探索結果でさらに多い蛋白質のペプチドがさらに頻繁に現れるという概念を基にする。さらに多い蛋白質を区別することに利用されるとしても、PAIは、蛋白質濃度に線形的な関係を示すわけではない。ePAI-1と定義されたemPAI値は、蛋白質濃度と大略比例する。だからそれは、絶対的な蛋白質の存在量を決定することに有用である。したがって、emPAI値に基づいて主要バンド蛋白質を識別した。主要蛋白質の中、二つの支配的な蛋白質が潜在的なバイオマーカーとしてさらに調査された。
混合された二つのサンプル(PreCR, CR)のDIGEを通じて、発現が異なっていると推定されるemPAI値の高い蛋白質は、AML患者のPreCRとCR血清グループの事実的な決定因子になり得る。
全ての統計的な計算は、SAS Software 9.1を使用して、全てのP-valuesは、two-tailed testsで報告された。ELISAを通じてそれぞれのPreCR, CR, PreNR, NR, Normalに対してCFHとApoHの水準を決定した後、正規性検定(Shapiro-Wilk test)をして、次のサンプルのグループ間に比較をした: PreCR vs. PreNR; CR vs. NR, and CR vs. Normal。
(実施例1の実験方法を行って得られた実験結果)
1.混合されたPreCRとCR血清サンプルのMDLCとDIGE分析
下記表1に示された特性を有する寛解された(CR group)AML患者の混合した二つの骨髄血清サンプルは、immunodepletedとCy dyes標識化、CFとRP chromatographyによる分析、そして1D-PAGEを、図1のような手順を通じて行った。
抽出されたゲルバンドにおいて、構成蛋白質の中、大量存在する5個の蛋白質は、LTQ-FT MS/MS分析を通じて同定されて、MASCOT検索を行ったが、これは、下記表2に示されている。
個々のPreCRとCR患者からの血清検体において、CFHとApoHの発現が異なっていることは、ELISAを通じて確認された。ELISA分析サンプルは、MDLC-DIGE分析のために混合した二つのサンプル(PreCR, CR)の比較のために使用された同じ33対の血清を含めた。それぞれのPreCRとCRサンプルにおいてCFHとApoHの水準は、ELISA(表3参照)を通じて決定されて、統計分析を通じて比較された(表4参照)。
CFHとApoH水準は、ELISAを通じて定量して(表4参照)、PreNRとNRのAML患者と健康な対照群(Normal)からの血清検体に対する統計的な分析がなされた。Box-and-whisker plotsによる比較の結果は、図で表現されており、図6に示されている。
Claims (14)
- 急性骨髄性白血病患者の化学療法治療後、AML寛解診断用生化学的マーカーを使用して、前記急性骨髄性白血病の寛解有無判断時に必要な情報を提供するために、採取した患者の血清に存在するCFH(complement factor H)またはApoH(apolipoprotein H)の含量を測定する生化学的マーカー検出方法。
- 前記CFHまたはApoHの含量は、前記血清に存在するCFHまたはApoHの濃度を測定して決定されることを特徴とする、請求項1に記載のAML寛解診断用生化学的マーカー検出方法。
- 前記CFHまたはApoHの濃度は、ELISAを利用して測定されることを特徴とする、請求項2に記載のAML寛解診断用生化学的マーカー検出方法。
- 前記測定されたCFHの濃度が176.82±28.17μg/mlであると、急性骨髄性白血病が寛解に到達したと見なされることを特徴とする、請求項2または3に記載のAML寛解診断用生化学的マーカー検出方法。
- 前記測定されたCFHの濃度が617.7±43.19μg/mlであると、急性骨髄性白血病が寛解に到達しなかったと見なされることを特徴とする、請求項2乃至4のいずれかに記載のAML寛解診断用生化学的マーカー検出方法。
- 前記測定されたApoHの濃度が181.55±39.81μg/mlであると、急性骨髄性白血病が寛解に到達したと見なされることを特徴とする、請求項2乃至5のいずれかに記載のAML寛解診断用生化学的マーカー検出方法。
- 前記測定されたApoHの濃度が606.6±48.79μg/mlであると、急性骨髄性白血病が寛解に到達しなかったと見なされることを特徴とする、請求項2乃至6のいずれかに記載のAML寛解診断用生化学的マーカー検出方法。
- 急性骨髄性白血病(AML)患者のCFH(complement factor H)またはApoH(apolipoprotein H)の含量を測定するための、CFHまたはApoHに特異的に結合する抗体を含む、急性骨髄性白血病(AML)患者において寛解及び非寛解を決定するための組成物。
- 前記CFHまたはApoHは、AML患者の血清試料に含まれたことを特徴とする、請求項8に記載の組成物。
- 前記組成物は、ELISA(enzyme-linked immunosorbant assay)に利用されることを特徴とする、請求項8に記載の組成物。
- 前記CFHの含量が176.82±28.17μg/mlに測定されると、前記AML患者は寛解に到達したと決定することを特徴とする、請求項8に記載の組成物。
- 前記CFHの含量が617.7±43.19μg/mlに測定されると、前記AML患者は寛解に到達しなかった、即ち非寛解として決定することを特徴とする、請求項8に記載の組成物。
- 前記ApoHの含量が181.55±39.81μg/mlに測定されると、前記AML患者は寛解に到達したと決定することを特徴とする、請求項8に記載の組成物。
- 前記CFHの含量が606.6±8.79μg/mlに測定されると、前記AML患者は寛解に到達しなかった、即ち非寛解として決定することを特徴とする、請求項8に記載の組成物。
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KR1020090034324A KR100937720B1 (ko) | 2009-04-20 | 2009-04-20 | CFH 또는 ApoH를 급성골수성백혈병 관해 진단용 생화학적 마커로 사용하는 방법 |
KR10-2009-0034324 | 2009-04-20 | ||
PCT/KR2010/002273 WO2010123216A2 (ko) | 2009-04-20 | 2010-04-13 | Cfh 또는 apoh를 급성골수성백혈병 관해 진단용 생화학적 마커로 사용하는 방법 |
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