JP6341486B2 - リポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出するためのロブスター血球抽出物からの組成物 - Google Patents
リポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出するためのロブスター血球抽出物からの組成物 Download PDFInfo
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- JP6341486B2 JP6341486B2 JP2014549358A JP2014549358A JP6341486B2 JP 6341486 B2 JP6341486 B2 JP 6341486B2 JP 2014549358 A JP2014549358 A JP 2014549358A JP 2014549358 A JP2014549358 A JP 2014549358A JP 6341486 B2 JP6341486 B2 JP 6341486B2
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Description
10mlの血リンパを、10mlの冷却抗凝固剤溶液を含む20mlの滅菌かつ発熱物質を含まない使い捨て注射器を使用して、第4歩行脚の基節から得た。使用した抗凝固剤は、27mMのクエン酸ナトリウム、336mMの塩化ナトリウム、115mMのグルコース、9mMのEDTA、pH7(1000mオスモル)から成るアルセバー変性溶液であった。血リンパ:抗凝固剤の混合物を50mlの滅菌かつ発熱物質を含まないポリプロピレン遠心管に注ぎ、10分間4℃で700gにて遠心分離した。血漿を含有する上清を廃棄した。その後、ペレット化した血球を洗浄して残留血漿成分を除去した。これを達成するために、血球ペレットを20mlの冷却抗凝固剤に懸濁させ、次いで体積を元の抗凝固剤:血リンパの体積(50ml)まで抗凝固剤を用いて上昇させ、上記のように再度遠心分離した。洗浄工程をもう一度繰り返した。洗浄した血球ペレットを、50mMのTris−HCl、450mMのNaCl、pH7.5から成る3mlの溶解緩衝液に再懸濁させ、次いで、13mm×10cmのホウケイ酸チューブに移した。血球懸濁液を、氷浴中で10秒間、20ワットの3サイクルを用いて超音波処理により溶解させた。血球ホモジネートを30分間4℃にて13000rpmで遠心分離することにより、清澄LHLを得た。
溶解物(0.1mg/mlで420μl)を1mg/mlのウシトリプシン4.2mlを用いて37℃で30分間インキュベートした。この混合物の100μlを、50mMのTris−HCl、pH7.5中の種々の濃度のL−DOPA(0.3〜8mM)又はドーパミン(0.15〜9mM)150μlを含有するマイクロプレートのウェルに添加した。マイクロプレートリーダにおいて37℃で20分間、490nmでフェノールオキシダーゼ活性を速度論的に測定した。
LHL(12mg/ml)を、50mMのTris−HCl、pH7.5を用いて0.5mg/mlに希釈した。滅菌かつ発熱物質を含まないことが保証された96ウェル平底マイクロプレートにおいてアッセイを実施した。反応混合物は150μlの50mM Tris−HCl、pH7.5、50mM CaCl2、20μlのLHL、及び50μlの活性化物質(LPS、PG又はBG)から構成された。対照は、内毒素を含まない水であった。最後に、50μlの3.75mMドーパミンを基質として添加した。ドーパミンクロム形成は、マイクロプレートリーダで37℃にて15秒ごとに読み出すことによって、1時間の間、490nmで速度論的に評価した。反応速度(ΔOD490/分)は、OD490nm対時間のプロットの直線部分から決定した。あるいは、開始時間は反応混合物が0.1の吸光度値に到達するのに必要な時間として決定した。PAMP濃度の対数に対する開始時間の対数のプロットは線形であり、かつ定量目的のために有用であった。
0.8mg/mLのLHLを、50mMのTris−HCl、pH7.5を用いて0.1mg/mLに希釈した。アッセイは平底ウェルマイクロプレートにおいて実施した。反応混合物は40μlの50mM Tris−HCl、pH7.5、50mM Tris−HCl、pH7.5に溶解させた160μlの1mg/mlトリプシン、10μlのLHL及び蒸留水に溶解させた40μlのMBTHから構成された。この混合物を37℃で20分間インキュベートし、最後に50μlの3.75mMドーパミンを各ウェルに添加した。反応はマイクロプレートリーダにおいて37℃で1時間の間、15秒ごとに490nmで速度論的に読み取った。
溶解緩衝液中に塩化ナトリウムを含まない実施例1に記載した通りに得られる50μlのLHL(1mg/ml)を、150μlの50mM Tris−HCl、pH7.5緩衝液、及び50μlのLPSと合わせた。その後、50μlの0.6mM 発色基質S−2222(Bz−Ile−Glu(γ−OR)−Gly−Arg−pNA−HCl)を各ウェルに添加した。放出されたp−ニトロアニリンを37℃で1時間、405nmで速度論的に検出した。
予め50mMのTris−HCl、0.2MのNaCl、pH7.5で平衡化したカラムXK16/70(Vt=131.4ml)中に充填したセファデックスG−50スーパーファインでのゲル濾過クロマトグラフィを用いて、LHL中のproPO活性化系の活性成分からプロテアーゼ阻害剤を分離する。4mlの8mg/ml LHL(3%Vt)を、0.3ml/分の流速で分画した。クロマトグラフィ分画を280nmでモニタリングした。カラムの空隙容量に相当する画分を集め、F1又は修正LHL(LHL−M)と命名した。
LHLをセファデックスG−50(1.5ml)で充填したスピンカラムで分画した。カラムを1分間1000rpmにて4回洗浄することにより、カラムを50mMのTris−HCl、450mMのNaCl、pH7.5緩衝液で平衡化した。実施例1の通りに調製した150μlのLHLをスピンカラムに適用し、1分間1000rpmで遠心分離した。溶出液を集め、LHL(F0画分とも称される)及び溶出液又は分画LHL(F1又はLHL−Mとも称される)の両方を、タンパク質濃度、トリプシンに対する阻害活性、及びフェノールオキシダーゼ活性について分析した。
阻害剤を含まない溶解物(修飾LHL;LHL−M)を実施例5に従って得た。50μlのLPS、150μlのTris−HCl、50mMのCaCl2、pH7.5、及び20μlの0.8mg/ml溶解物(LHL−M)の反応混合物を30分間37℃でインキュベートした。最後に50μlの3.75mMドーパミンを添加し、反応の進行を37℃で1時間、490nmで速度論的に読み取った。開始時間は、0.3の光学密度に到達するのに必要な時間として算出し、その後、LPS濃度の対数に対する開始時間の対数をプロットした。
LHL調製中に得られた血漿を、4℃で20分間、5000rpmで遠心分離して清澄化した。100mlの清澄化した血漿を、8000Daのカットオフの透析膜を用いて、48時間4℃にて5Lの蒸留水に対して透析した。期間中、透析水を12時間ごとに4回変更した。透析液を4℃で20分間、5000rpmで遠心分離し、上清を捨てた。タンパク質のペレットを50mMのTris−HCl、0.2MのNaCl、pH7.5(緩衝液A)に懸濁させ、再度遠心分離して不溶性の変性タンパク質を除去した。5ml中の35mgの試料を、予め緩衝液Aで平衡化したヘパリン−セファロースCL−6Bを充填したカラムに適用した。非結合タンパク質を溶出後、カラムを緩衝液A:緩衝液B(60:40v/v)の混合物の2.5カラム体積で洗浄した。緩衝液Bは50mMのTris−HCl、1MのNaCl、pH7.5から構成された。最後に、LGBPを緩衝液A:緩衝液B(30:70v/v)の5カラム体積で溶出させた。クロマトグラフィ工程を1ml/分の流速で実施し、タンパク質画分を280nmで検出した。
Claims (13)
- 病原体関連分子パターンのリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンの全てを検出するための組成物を得る方法であって、該組成物はプロフェノールオキシダーゼ活性化系を含むロブスターの血球抽出物であり、ロブスターから血リンパを抽出し、その後に血球を分離、洗浄及び崩壊する工程を含み、前記血リンパの抽出は、スルフヒドリル基を修飾可能な試薬、メチルキサンチン誘導体、又は二価の陽イオンキレート剤と組み合わされた等張液から構成される抗凝固剤を用いて行われる、ことを特徴とする方法。
- 請求項1に記載の組成物を得る方法であって、前記血球抽出物はザリガニ下目、イセエビ下目(イセエビ類)又はアナジャコ下目に含まれるロブスターから得る、方法。
- 請求項1又は2に記載の方法であって、前記血球は遠心分離又は重力によって血漿から分離され、洗浄されて0.001〜600mモルの間の濃度の塩化ナトリウムを少なくとも含む溶解緩衝液中で溶解する、方法。
- 請求項1又は2に記載の方法であって、前記血球は浸透圧ショック、凍結/融解によって、撹拌若しくは手動の均質化によって、又は超音波によって溶解される、方法。
- 請求項1又は2に記載の方法であって、前記組成物は5kDaのペプチダーゼ阻害剤を含まないことを特徴とする、方法。
- 請求項5に記載の方法において、5kDaのペプチダーゼ阻害剤を除去する方法が、分子のサイズ及び形状、親和性、免疫親和性、又は分子電荷による分離に基づく、方法。
- 請求項5に記載の方法によって得られた組成物を用いて、前記リポ多糖、ペプチドグリカン及び1,3−β−D−グルカンの存在を検出する方法であって、前記プロフェノールオキシダーゼ活性化酵素のペプチダーゼ活性を測定することによって検出することを特徴とする検出方法。
- 請求項7に記載のリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出する検出方法であって、前記プロフェノールオキシダーゼ活性化酵素の酵素活性は、トリプシン様セリンプロテアーゼに対する発色基質又は蛍光発生基質を用いて測定される、検出方法。
- 請求項7に記載のリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出する検出方法であって、前記ペプチダーゼ活性は速度論的、疑似速度論的又はエンドポイントの方法によって分光光度的に測定される、検出方法。
- 請求項5に記載の方法によって得られた組成物を用いて、前記リポ多糖、ペプチドグリカン及び1,3−β−D−グルカンの存在を検出する方法であって、フェノールオキシダーゼ酵素の活性を測定することによって検出することを特徴とする検出方法。
- 請求項10に記載のリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出する検出方法であって、前記フェノールオキシダーゼ活性はモノフェノール基質又はo−ジフェノール基質を用いて測定される、検出方法。
- 請求項10に記載のリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出する検出方法であって、前記フェノールオキシダーゼ反応は速度論的、疑似速度論的又はエンドポイントの方法によって分光光度的に測定される、検出方法。
- 請求項10に記載のリポ多糖、ペプチドグリカン及び1,3−β−D−グルカンを検出する検出方法であって、モノフェノール基質又はo−ジフェノール基質を用いた前記フェノールオキシダーゼ反応の感度は、反応混合物中に0.3〜10mモルの間の濃度の3−メチル−2−ベンゾチアゾリノンヒドラゾンを含むことによって増大される、検出方法。
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US5716834A (en) | 1994-08-19 | 1998-02-10 | National University Of Singapore | Cloned factor C cDNA of the Singapore horseshoe crab, Carcinoscorpius rotundicauda and purification of factor C proenzyme |
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EP0924220A3 (en) | 1997-12-16 | 2000-04-26 | Wako Pure Chemical Industries, Ltd. | Inhibitor of the activation of beta-glucan recognition protein |
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WO2003083090A1 (en) | 2002-03-28 | 2003-10-09 | Council Of Scientific And Industrial Research | In vitro culture of amoebocytes from tachypleus gigas in leibovitz culture medium |
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BR112014016111B1 (pt) | 2020-11-24 |
BR112014016111A2 (pt) | 2018-05-22 |
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ES2690565T3 (es) | 2018-11-21 |
WO2013113296A1 (es) | 2013-08-08 |
CA2861982C (en) | 2020-11-10 |
US10023899B2 (en) | 2018-07-17 |
CU20110243A7 (es) | 2013-08-29 |
IN2014DN05849A (ja) | 2015-05-22 |
EP2811031B1 (en) | 2018-07-11 |
CO7101194A2 (es) | 2014-10-31 |
US10844421B2 (en) | 2020-11-24 |
EP2811031B8 (en) | 2018-12-26 |
JP2015506679A (ja) | 2015-03-05 |
US20140356889A1 (en) | 2014-12-04 |
EP2811031A1 (en) | 2014-12-10 |
CA2861982A1 (en) | 2013-08-08 |
CU24073B1 (es) | 2015-01-29 |
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