JP4991273B2 - Fsap活性の差異的調節に基づく第vii因子活性化プロテアーゼ(fsap)のマールブルグi変異の保因者を同定するための診断方法 - Google Patents
Fsap活性の差異的調節に基づく第vii因子活性化プロテアーゼ(fsap)のマールブルグi変異の保因者を同定するための診断方法 Download PDFInfo
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Description
i)FSAP MR I変異体の保因者由来の試料中のおよびFSAP MR I変異体の非保因者由来の試料中のFSAP活性の両方を阻害もしくは亢進するがその程度は異なるものであるか、または
ii)FSAP MR I変異体の保因者由来の試料中のFSAP活性を阻害しそしてFSAP MR I変異体の非保因者由来の試料中のFSAP活性を亢進するか、もしくはその逆であり、または
iii)試料型の1つではFSAP活性を亢進もしくは阻害するが、他の試料型ではFSAP活性の変化は無視し得る、
ようないずれかの物質または物質の混合物を意味する。
a)FSAP MR I変異体の非保因者および保因者それぞれ由来の試料中のFSAP活性の阻害(減少)もしくは亢進(増加)において定量的な差異をもたらす、すなわち両方の試料型でFSAP活性を、例えば増加もしくは減少させるかが、その程度は異なるものであるかまたは
b)FSAP MR I変異体の非保因者および保因者それぞれ由来の試料中のFSAP活性の調節における定量的な差異をもたらす、すなわち試料型の1つでは活性を亢進させすなわち増加させ、他の試料型では活性を減少させすなわち阻害する、
ものである。
1)並行して、すなわち2つの別々の反応混合液中にて、または
2)連続して、すなわち単独の反応混合液中で、最初に不在下で、そして続いて差異的活性調節剤を添加して、該差異的活性調節剤の存在下にて、
可能となる。
1.2つの反応混合物中の活性の変化の測定
この試験原理では、試料中に存在するFSAP活性を、第一の反応混合液中すなわち試料の第一アリコット中でFSAP活性の差異的活性調節剤の存在下で測定し、次に第二の反応混合液中すなわち試料の第二アリコット中で該差異的活性調節剤の不在下で測定することによって、該FSAP活性の変化の程度が決定される。2つの反応結果を比較して活性調節剤の存在下でのFSAP活性の変化の程度に関する情報が与えられる。
この試験原理では、試料を1つまたはそれ以上の試薬と共にインキュベーションしFSAP活性を単一反応混合物中で測定できるようにし、次に反応中に差異的活性調節剤を添加し、続いて反応中での変化を知ることで、試料中に存在するFSAP活性の変化の程度を決定する。
a)イオン類(塩化物、カーボネート、サルフェート、ホスフェート等のような陰イオン、またはナトリウム、リチウム、アンモニウム、マグネシウム、カルシウム、マンガン等のような陽イオン);
b)キレート剤、例えばエチレンジアミン四酢酸(EDTA)、エチレングリコールビス(β−アミノエチルエーテル)−N,N,N',N'−四酢酸、クエン酸等;
c)洗剤、例えばドデシル硫酸ナトリウム(SDS)、トリトン(R) X100、ツイーン(R)等;
d)酸化還元活性物質、例えばジチオエリスロール、ジチオスレイトール、β−メルカプトエタノール、グルタチオン、リポ酸、ビタミンC、ビタミンE等;
e)核酸、特にアプタマー;
f)抗体;
g)タンパク質、ペプチドおよびオリゴペプチド類、例えば、アンチトロンビンIII、C1−エステラーゼ阻害インヒビター、組織因子経路インヒビター(TFPI)、ヘパリン補因子II、α2−マクログロビン、α2−アンチプラスミン、インター−α−トリプシンインヒビター、α1−アンチトリプシン、α1−アンチキモトリプシン、2型プラスミノゲン・アクチベーター・インヒビター(PAI-2)、3型プラスミノゲン・アクチベーター・インヒビター(PAI-3)、キニノゲン、高分子量キニノゲン(HMWK)等;
h)合成セリンプロテアーゼ阻害剤、例えばFOY-305[N,N−ジメチル−カルバモイルメチル−4−(4−グアニジノベンゾイルオキシ)フェニルアセテート・メタン−スルホネート]および対応する誘導体;
i)低分子量プロテアーゼ阻害剤、例えばフォイパン(FOIPAN)(カモシタットメシレート)。
図1は、非保因者(野生型)の血漿試料について見られた、アプロチニンの存在下でのプロウロキナーゼ活性化FSAP活性の阻害を示す。
図2は、MR I多形のヘテロ接合型保因者の血漿試料について見られた、アプロチニンの存在下でのプロウロキナーゼ活性化FSAP活性の阻害を示す。
図3は、FSAP MR I変異体の非保因者(野生型)の血漿プールの試料について見られた、アプロチニンの存在下でのアミド分解FSAP活性の阻害を示す。
図4は、MR I多形のヘテロ接合型保因者の血漿試料について見られた、アプロチニンの存在下でのアミド分解FSAP活性の阻害を示す。
図5は、非保因者(野生型;白い円)およびMR I多形のヘテロ接合型保因者(黒い四角)の血漿試料について、アプロチニンの不在下および、約1時間の反応時間で添加した(矢印)後のアプロチニンの存在下でのアミド分解FSAP活性の変化を示し、該活性は単一反応混合物中で測定された。両方の試料共、最初はアプロチニンの不在下で同じFSAP活性を示すために識別はできないが、アプロチニンの存在下で活性は変化し、FSAP活性が非保因者の試料ではより強く阻害されるので2つの試料は識別できる。
例として、図6は、例えば野生株ホモ接合型保因者(破線)とMR Iへテロ接合型保因者(実線および点線)の群由来の試料中のFSAP活性のような、実側変数の可能な頻度分布を示す。この場合に用いた点線の調節剤は野生型ホモ接合型保因者のFSAP活性への影響はないが、MR Iへテロ接合型ではFSAP活性をさらに減少させる。野生型とMR Iへテロ接合型の保因者の群由来の試料のFSAP活性の分布の重なりは、活性調節剤の存在下ではその不在下より小さかった。したがって、各種の保因者および形態の間で、活性調節剤の存在下ではその不在下に比べてより良い識別が可能であり、したがって診断の感受性および/または特異性は増加する。
差異的活性調節剤のアプロチニンの存在下および不在下でのプロウロキナーゼ活性化FSAP活性の測定
ハイブリドーマ細胞株DSM ACC2453により産生された抗FSAP抗体を、固相に結合させたFSAPに親和性を有する結合パートナーとして用いた。ポリスチレンミクロタイタープレート(MTP)を、不均一系検出方法を行うための固相として用いた。50mM NaHCO3, pH8.2中の抗FSAP抗体を、MTPのウエル当たり120μlのコーティング容積および1mL当たり抗体20μgのコーティング濃度を用いて、室温でポリスチレン固相へ終夜結合させた。非結合抗体を50mM リン酸ナトリウム緩衝化等張NaCl溶液、0.02% ツイーン(R)20, pH6.5を用いて三回洗浄して除去した。
a)30μlの試験緩衝液I(50mM トリス塩酸, pH7.2, 150mM NaCl, 0.2% ツイーン(R)80, 15mM CaCl2 および50I.U./ml のヘパリンを含む)、または
b)30μlの、追加的にアプロチニンを、反応混合液中で最終アプロチニン濃度が0.055 KIU/mlになるような濃度で加えた試験緩衝液I(1U=1カリクレイン−阻害単位[KIU];アプロチニンはウシ肺由来、Sigma-Aldrich Laborchemikalien GmbH, タウフキルヘン、ドイツ)、
そして各場合、組み換えプロウロキナーゼ(Landing Biotech Inc., ブライトン、マサチューセッツ州、米国;試験緩衝液I中5μg/ml)、および各場合、試験緩衝液II(100mM トリス塩酸, 150mM NaCl, 15mM アジ化ナトリウム, 0.1% ツイーン(R)80, pH8.2)中の発色性基質S-2444(0.6mM)をMTPウエル中に注入し、そして+37℃でインキュベーションした。反応混合物の吸収(OD)の変化を405nmの波長で追跡した。結果を表1にまとめて示した。FSAP MR I変異体の保因者と非保因者との間の識別が、アプロチニンを加えない試料の反応速度のvmaxであるvmax0とアプロチニンを加えたvmaxアプロチニンとの商を求めることで可能である。以下の式がそれに適用される:
FSAP野生型vmax0/FSAP野生型vmaxアプロチニン>FSAP MR Ivmax0/FSAP MR Ivmaxアプロチニン。
差異的活性調節剤のアプロチニンの存在下および不在下での低分子量発色性ペプチド基質S-2288に対するアミド分解FSAP活性の測定
マイクロタイタープレートは実施例1と同じものを用いた。各場合に、測定すべき血漿試料の100μlを、試料緩衝液(実施例1を参照)中で1:50に希釈してウエルにピペットで注入した。+37℃で1時間インキュベーションした後、非結合成分を50mM リン酸ナトリウム緩衝化等張NaCl溶液、0.02% ツイーン(R)20, pH6.5を用いて三回洗浄して除去した。
a)30μlの試験緩衝液I(実施例1を参照)、または
b)30μlの、追加的にアプロチニンを、反応混合液中で最終アプロチニン濃度が0.055 KIU/mlになるような濃度で加えた試験緩衝液I(実施例1を参照)、
そして各場合、試験緩衝液II(実施例1を参照)中の発色性基質S-2288(1.5mmol/L;Chromogenix Instrumentation Laboratory S.p.A., ミラノ、イタリア)を試験ウエル中に注入し、そして+37℃で1時間インキュベーションした。MTP中での比較的長いインキュベーション時間の間の蒸発効果を減少させるために、上に鉱油の層を載せた。
FSAP野生型vmax0/FSAP野生型vmaxアプロチニン>FSAP MR Ivmax0/FSAP MR Ivmaxアプロチニン。
反応中に差異的活性調節剤を添加することによる低分子量発色性ペプチド基質S-2288に対するアミド分解FSAP活性の変化の測定
マイクロタイタープレートは実施例1と同じものを用いた。各場合に、測定すべき血漿試料の100μlを、試料緩衝液(実施例1を参照)中で1:15に希釈してウエルにピペットで注入した。+37℃で1時間インキュベーションした後、非結合成分を実施例1のように三回洗浄して除去した。
FSAP野生型vmax0/FSAP野生型vmaxアプロチニン>FSAP MR Ivmax0/FSAP MR Ivmaxアプロチニン。
Claims (8)
- 遺伝的関連性のある第VII因子活性化プロテアーゼ(FSAP)MR I変異体のヘテロ−またはホモ接合型発現を検出する方法であって、FSAPの活性を測定し、差異的活性調節剤の不在下および存在下で測定される試料中に存在するFSAP活性を含み、ここで、該差異的活性調節剤は遺伝的関連性のあるFSAP MR I変異体のヘテロ−またはホモ接合型発現を有するヒト由来の試料中の該FSAP活性を、FSAP MR I変異体を発現しないヒト由来の試料中とは異なった程度変化させるものであり、アプロチニン、およびモノクローナルまたはポリクローナル抗FSAP抗体からなる群から選択される上記方法。
- 測定されたFSAP活性がプラスミノゲン・アクチベーター活性化FSAP活性である、請求項1記載の方法。
- 測定されたFSAP活性がアミド分解FSAP活性である、請求項1記載の方法。
- 差異的活性調節剤が、FSAP MR I変異体を発現しないヒト由来の試料中のFSAP活性を、遺伝的関連性のあるFSAP MR I変異体のヘテロ−またはホモ接合型発現を有するヒト由来の試料中と比べてより大きな程度阻害または活性化する、請求項1〜3のいずれかに記載の方法。
- ハイブリドーマ細胞株DSM ACC2454、DSM ACC2674およびDSM ACC2726の1つにより産生されるモノクローナル抗FSAP抗体が用いられる、請求項1〜4のいずれかに記載の方法。
- ハイブリドーマ細胞株DSM ACC2454、DSM ACC2674およびDSM ACC2726の一つにより産生されるモノクローナル抗FSAP抗体の1つにより結合されるFSAPエピトープへ結合するモノクローナル抗FSAP抗体が用いられる、請求項1〜4のいずれかに記載の方法。
- a)試料の第一のアリコット中のFSAP活性を差異的活性調節剤の存在下で測定し;
b)同じ試料の第二のアリコット中のFSAP活性を差異的活性調節剤の不在下で測定し;そして
c)a)およびb)中で測定された2つの活性を比較する、
ことによってFSAP活性の変化の程度が測定される、請求項1〜6のいずれかに記載の方法。 - a)試料のアリコット中のFSAP活性を差異的活性調節剤の不在下で測定し;
b)反応混合物に差異的活性調節剤を加え;次いで
c)FSAP活性を差異的活性調節剤の存在下で測定し;そして
d)a)およびc)中で測定された2つの活性を比較する;
ことによってFSAP活性の変化の程度が測定される、請求項1〜6のいずれかに記載の方法。
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DE102005062053.1 | 2005-12-22 | ||
DE200510062053 DE102005062053A1 (de) | 2005-12-22 | 2005-12-22 | Diagnostisches Verfahren zur Erkennung von Trägern der Marburg I-Variante der Faktor VII-aktivierenden Protease (FSAP) anhand differenzieller Modulation der FSAP-Aktivität |
DE102005062055.8 | 2005-12-22 | ||
DE200510062055 DE102005062055A1 (de) | 2005-12-22 | 2005-12-22 | Diagnostisches Verfahren zur Erkennung von Trägern der Marburg I-Variante der Faktor VII-aktivierenden Protease (FSAP) anhand der differenziellen Modulation der FSAP-Aktivität in einem einzigen Reaktionsansatz |
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US20110039280A1 (en) * | 2007-10-29 | 2011-02-17 | Purdue Research Foundation | Hybrid microfluidic spr and molecular imaging device |
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