JP2011022000A - 敗血症又は多臓器不全の予後診断方法及び予後診断用キット - Google Patents
敗血症又は多臓器不全の予後診断方法及び予後診断用キット Download PDFInfo
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Abstract
【解決手段】本発明に係る予後診断方法は、被験者から採取した尿に含まれる肝型脂肪酸結合蛋白質を特異的抗体で検出する第1の検出工程と、上記尿をヘミン等の酸化還元試薬で処理し、処理後の尿に含まれる肝型脂肪酸結合蛋白質を上記特異的抗体で検出する第2の検出工程と、第1の工程における検出値と第2の工程における検出値とを比較する比較工程と、を含む。第2の工程における検出値が第1の工程における検出値と比較して大きいほど、予後が不良と判断される。
【選択図】図4
Description
前記尿を酸化還元試薬で処理し、処理後の尿に含まれるL−FABPを前記特異的抗体で検出する第2の検出工程と、
前記第1の工程における検出値と前記第2の工程における検出値とを比較する比較工程と、
を含む敗血症又は多臓器不全の予後診断方法。
本発明に係る予後診断方法は、被験者から採取した尿に含まれるL−FABPを特異的抗体で検出する第1の検出工程と、上記尿を酸化還元試薬で処理し、処理後の尿に含まれるL−FABPを上記特異的抗体で検出する第2の検出工程と、上記第1の工程における検出値(検出結果)と上記第2の工程における検出値(検出結果)とを比較する比較工程と、を含むものである。
第1の検出工程では、被験者から採取した尿に含まれるL−FABPを、L−FABPに対する特異的抗体を用いて免疫化学的方法により検出する。
第2の検出工程では、上記被験者から採取した尿を酸化還元試薬で処理し、処理後の尿に含まれるL−FABPを、上記第1の検出工程と同様に特異的抗体で検出・定量する。上述したように、尿を酸化還元試薬で処理することにより、尿中L−FABPの免疫反応性が増強される。これは、尿中L−FABPの一部はシステイン残基等において化学修飾を受けているが(Peter Dormann et al., J. Biol. Chem., 268: 16286−16292, 1993)、酸化還元試薬で処理することによりこの化学修飾が外れ、抗体との結合性が向上するためと推測される。なお、この増強効果は、リコンビナントL−FABPについても観察される。
比較工程では、上記第1の工程における検出値(検出結果)と上記第2の工程における検出値(検出結果)とを比較する。上述したように、採取した尿を酸化還元試薬で処理することで、尿中L−FABPの免疫反応性が増強され、その増強程度(誘導倍率)が大きいほど、敗血症又は多臓器不全の患者の予後は不良である。したがって、上記第1の工程における検出値と上記第2の工程における検出値とを比較し、誘導倍率が閾値を超えるか否かにより、予後を診断することができる。この閾値は、予後の良好な患者と予後が不良な患者とにおける誘導倍率の統計により設定される。例えば、当該閾値は、予後の良好な患者と不良な患者との誘導倍率を基に、ROC解析(Receiver Operating Characteristic analysis)を行い、感度、特異度ともに80%以上、好ましくはROC曲線下面積(AUC:Area Under the Curve)が0.8以上となるように設定される。
本発明に係る予後診断用キットは、上述した予後診断方法に使用するものである。この予後診断用キットとしては、例えば、ビーズやプレート(96穴マイクロプレート等)等の担体上に抗L−FABP抗体を吸着/結合させたものが挙げられる。この場合、予後診断用キットには、L−FABPに対する特異的抗体や酸化還元試薬が組み合わされる。特異的抗体は標識物であってもよい。標識物としては、ペルオキシダーゼ等の酵素が結合された抗体(酵素標識抗体)、ビオチン化された抗体(ビオチン標識抗体)等が挙げられる。また、酸化還元試薬は溶媒に溶解された状態の処理液であってもよい。さらに、予後診断用キットには、EIA等に必要となる試薬(酵素標識した2次抗体や発色基質等)が組み合わされていてもよい。
さらに、迅速・簡便に結果を判断できるイムノクロマトキットを基にした定性、半定量、又は定量測定法を利用したものであってもよい。
0.5mM ヘミン又は10mM トリス(2−カルボキシエチル)フォスフィン塩酸塩(TCEP)を含む処理液(溶媒:Trisバッファー)とrhL−FABP標準品(50〜400ng/mL)とを等量混合し、室温で10分間静置後、ELISA法(hL−FABP測定キット、IBL社製)により吸光度を検出した。ベースラインとしては、処理液の溶媒であるTrisバッファーとrhL−FABP標準品とを混合したものを準備した。
まず、ヒトL−FABP遺伝子を導入したトランスジェニックマウス(hL−FABP−Tgマウス)を作製するため、13週齢以上のBCF1系雄マウスを不妊交配用及び自然交配用に、10週齢以上のICR系雌マウスを胚移植用及び里親用に、13週齢以上のBDF1系雄マウスを交配用に、8週齢以上のBCF1系雌マウスを採卵用に、それぞれ使用した。これにより得られるトランスジェニックマウス(B6C3F1系)について、BALB/cAマウスと戻し交配を行い、hL−FABP−Tgマウスを作製した。
東京大学医学部附属病院集中治療部(ICU)にて治療を受けた患者のうち、入室時に2臓器以上の多臓器不全を呈し、血液浄化療法の開始が検討された症例を対象に、入室時における尿を採取し、ELISA法(hL−FABP測定キット、IBL社製)によりhL−FABP量を測定した。また、同じ尿検体と0.5mM ヘミンを含む処理液(溶媒:Trisバッファー)と等量混合し、室温で10分間静置後、同様にしてhL−FABP量を測定した。生存群(N=16)と死亡群(N=6)とにおける、未処理の場合の尿中hL−FABP測定値(ng/mL)、ヘミン処理を行った場合の尿中hL−FABP測定値(ng/mL)、誘導倍率を下記表1に示す。この表1には、各患者の転帰、臨床情報についても併せて示す。また、この表における数値を生存群、死亡群について纏めたものを図3,4に示す。
Claims (5)
- 被験者から採取した尿に含まれる肝型脂肪酸結合蛋白質を特異的抗体で検出する第1の検出工程と、
前記尿を酸化還元試薬で処理し、処理後の尿に含まれる肝型脂肪酸結合蛋白質を前記特異的抗体で検出する第2の検出工程と、
前記第1の工程における検出値と前記第2の工程における検出値とを比較する比較工程と、
を含む敗血症又は多臓器不全の予後診断方法。 - 前記比較工程では、前記第1の検出工程における検出値と前記第2の検出工程における検出値との比を閾値と比較する請求項1記載の予後診断方法。
- 前記酸化還元試薬がヘミンである請求項1又は2記載の予後診断方法。
- 請求項1から3のいずれか記載の予後診断方法に使用するための予後診断用キット。
- 肝型脂肪酸結合蛋白質に対する特異的抗体及び酸化還元試薬を含む請求項4記載の予後診断用キット。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20170118858A (ko) | 2015-02-25 | 2017-10-25 | 세키스이 메디칼 가부시키가이샤 | L-fabp의 면역학적 측정 방법 및 해당 방법에 사용되는 측정 시약 |
EP3564673A1 (en) | 2015-02-25 | 2019-11-06 | Sekisui Medical Co., Ltd. | L-fabp immunoassay method and assay reagent used in said method |
WO2020067472A1 (ja) * | 2018-09-28 | 2020-04-02 | シミックホールディングス株式会社 | 肝疾患の検査方法、その検査キット及びコンパニオン診断薬 |
JP2020056626A (ja) * | 2018-09-28 | 2020-04-09 | シミックホールディングス株式会社 | 肝疾患の検査方法、その検査キット及びコンパニオン診断薬 |
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US9377470B2 (en) | 2016-06-28 |
WO2011007823A1 (ja) | 2011-01-20 |
US20120135433A1 (en) | 2012-05-31 |
JP5565607B2 (ja) | 2014-08-06 |
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