JP6482459B2 - 細胞サンプル中の生存細胞を検出する方法 - Google Patents
細胞サンプル中の生存細胞を検出する方法 Download PDFInfo
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- JP6482459B2 JP6482459B2 JP2015510465A JP2015510465A JP6482459B2 JP 6482459 B2 JP6482459 B2 JP 6482459B2 JP 2015510465 A JP2015510465 A JP 2015510465A JP 2015510465 A JP2015510465 A JP 2015510465A JP 6482459 B2 JP6482459 B2 JP 6482459B2
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/536—Immunoassay; Biospecific binding assay; Materials therefor with immune complex formed in liquid phase
- G01N33/542—Immunoassay; Biospecific binding assay; Materials therefor with immune complex formed in liquid phase with steric inhibition or signal modification, e.g. fluorescent quenching
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- G—PHYSICS
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
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- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
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Description
本出願は、それぞれ参照により全開示内容が本明細書に組み込まれる、2012年5月2日出願の同時係属の米国仮特許出願第61/641,809号明細書および2013年3月14日出願の同時係属の米国仮特許出願第61/784,789号の優先権および恩典を請求するものである。
本明細書で説明される細胞収集システムは、生存細胞の存在を検出する光検出システムと共に使用することができる。この結果を使用して、目的の特定のサンプルのバイオバーデン(例えば、サンプル中の生存細胞の数および/またはパーセンテージおよび/または画分)を測定することができる。検出システムの例が、例えば、2010年11月3日出願の国際出願PCT/IB2010/054965号明細書、2011年2月24日出願の米国特許出願第13/034,402号明細書、2010年11月3日出願の国際出願PCT/IB2010/054966号明細書、2011年2月24日出願の米国特許出願第13/034,380号明細書、2010年11月3日出願の国際出願PCT/IB2010/054967号明細書、および2011年2月24日出願の米国特許出願第13/034,515号明細書に記載されている。図1Aに概略的に示されている例示的なシステム100の一実施形態は、(i)細胞が配置される多孔質膜が回転軸140を中心に回転する回転プラットフォーム130および(ii)光源180(例えば、白色光源またはレーザー光源(例えば、近赤外線レーザー))を備える検出システム170に対して線形に(経路160を参照)に移動する可動プラットフォーム150含むサンプルアセンブリ120、ならびに少なくとも1つの検出器190、例えば、蛍光検出器を備えている。光源180からの光ビーム(励起光)が、回転プラットフォーム130およびその上に配置された平面膜に衝当し、放射光が検出器190によって検出される。光源180および検出器190は、光ビームが衝突し、実質的に同じ角度でプラットフォーム130から離れるように、プラットフォーム130に対して同様の角度で配置することができる。特定の状況では、検出システムは、1つの波長範囲(図12Bを参照)または複数の波長範囲を検出する1つの検出器からなる。あるいは、検出システムは、それぞれが異なる波長範囲を検出する複数の検出器からなる。
図10Aは、例示的なカップ/ベースアセンブリ550の構成要素を示している。多孔質支持部材558および膜202が、ベース554の中心に配設される。次いで、カップ552が、膜202の上部に取り付けられ、これにより、この膜202が平らな位置に容易に維持される。カップ552の内部が汚染されないようにするためにカップ552の上部に蓋556を設けることができる。図10Bは、構成要素の取り付けを示している(膜202および支持部材558は示されていない。
細胞が透過性膜に収集されたら、細胞を、生死判別染色剤または生死判別染色システムを用いて染色して、生存細胞を検出する、または生存細胞と非生存細胞を区別することができる。特定の染色プロトコルは、様々な因子、例えば、検出される細胞、利用される染色剤または染色システム、ならびに細胞が迅速に染色されて検出されるか否か、または細胞が、一定期間、例えば、30分〜数時間培養されて細胞が増殖し、これにより1つの細胞ではなく複数の細胞が特定の位置で検出されるか否かによって決まる。例示的な染色、および必要な場合は培養プロトコルも、以下のセクションで説明される。
細胞収集システムを使用して、流体サンプル中に元々存在した細胞を収集したら、膜または膜アセンブリを、適切な検出システムの中に挿入するために膜ホルダー(例えば、ホルダー802)の中に挿入することができる。例示的な検出システムは、例えば、2010年11月3日出願の国際出願PCT/IB2010/054965号明細書、2011年2月24日出願の米国特許出願第13/034,402号明細書、2010年11月3日出願の国際出願PCT/IB2010/054966号明細書、2011年2月24日出願の米国特許出願第13/034,380号明細書、2010年11月3日出願の国際出願PCT/IB2010/054967号明細書、および2011年2月24日出願の米国特許出願第13/034,515号明細書に記載されている。上述の検出システムでは、励起光ビームが膜の表面に照射されるときに、膜が回転させられる。放射された光は、少なくとも1つの光検出器で検出される。
この実施例は、蛍光プローブおよび1回の消光剤洗浄を用いて固体支持体上の生菌(大腸菌(E.coli))を選択的に染色して画像化することが可能であることを実証する。
この実施例は、蛍光プローブおよび2つのPET消光剤を用いて溶液中の生菌(大腸菌(E.coli))を選択的に染色して画像化することが可能であることを実証する。
この実施例は、蛍光プローブおよびPET消光剤とFRET消光剤との組み合わせを用いて溶液中の生菌(大腸菌(E.coli))を選択的に染色して画像化することが可能であることを実証する。
この実施例は、図1Aに概略的に示されている検出システムを用いて、蛍光プローブおよび消光剤洗浄により生存微生物を選択的に染色して画像化することが可能であることを実証する。
この実施例は、核酸結合膜不透過性消光剤と組み合わせられた核酸結合膜透過性蛍光染料を用いて生存微生物(大腸菌(E.coli)、黄色ブドウ球菌(S.aureus)、カンジダアルビカンス(C.albicans))を選択的に染色して画像化することが可能であることを実証する。
この実施例は、核酸結合膜不透過性消光剤と組み合わせて核酸結合膜透過性蛍光染料を用いて生存微生物(大腸菌(E.coli)および黄色ブドウ球菌(S.aureus))を選択的に染色して画像化し、次いで、生存細胞が回転膜上で検出される本明細書で説明された検出システムまたは落射蛍光顕微鏡のいずれかを用いて生存細胞を画像化することが可能であることを実証する。
本明細書で言及した特許文献および科学論文のそれぞれの全開示は、あらゆる目的のために参照により組み込まれる。米国仮特許出願第61/641,805号明細書;同第61/641,809号明細書;同第61/641,812号明細書;同第61/784,759号明細書;同第61/784,789号明細書;および同第61/784,807号明細書の全ての開示内容は、あらゆる目的のために参照により本明細書に組み込まれる。
本発明は、本発明の概念または本質的な特徴から逸脱することなく、他の特定の形態で実施することができる。従って、上述の実施形態は、本明細書で説明される本発明を限定するのではなく、全ての点で例示であると見なされるべきである。様々な実施形態の様々な構造要素および開示される様々な方法のステップは、様々な組み合わせおよび順で利用することができ、このような全ての変更形態が、本発明の形態と見なされる。従って、本発明の範囲は、上述の説明ではなく添付の特許請求の範囲によって示され、請求項と均等の意味および範囲に含まれる全ての変更が、本発明に包含されるものとする。
Claims (21)
- 液体サンプル中の生存細胞の存在および/または量を検出する方法であって、前記方法が、
(a)液体サンプルを、実質的に平面の多孔質膜の少なくとも一部分を通過させ、その結果、生存細胞が存在する場合、生存細胞が多孔質膜の一部分に保持されるステップ、ここで、前記多孔質膜は、最大でも100μmの平面度公差を有し、最大でも100μmの平面度公差を有する膜接触表面を含む流体透過性支持部材の上に維持される;
(b)前記液体サンプルが多孔質膜を通過した後に、多孔質膜の一部分に保持された生存細胞が存在する場合は、生存細胞を蛍光標識で標識するステップ;
(c)前記多孔質膜を検出システムに対して回転させることによって、最大でも100μmの平面度公差を有する前記多孔質膜の一部分をスキャンするステップ、ここで、前記検出システムが、
(i)前記蛍光標識を励起して発光事象を生じさせるのに適した波長の光ビームを放射する光源、および
(ii)前記発光事象を検出することができる少なくとも1つの検出器
を含み、前記スキャンにより、前記平面の多孔質膜の複数の領域を調べ、全ての生存細胞に関連した蛍光標識の励起によって生じる発光事象を検出する;ならびに
(d)ステップ(c)で検出された発光事象に基づいて、前記膜によって収集された生存細胞の存在および/または量を決定するステップ、
を含み、前記生存細胞が微生物である、方法。 - ステップ(b)で、前記細胞が、生死判別染色剤および生死判別染色システムの少なくとも1つを用いて標識される、請求項1に記載の方法。
- 光源のビームが、350nm〜1000nmの範囲の波長を有する光を放射する、請求項1または2に記載の方法。
- 前記波長が、350nm〜600nmおよび600nm〜750nmの少なくとも1つの範囲である、請求項3に記載の方法。
- 前記検出器が、350nm〜1000nmの範囲の放射光を検出する、請求項1〜4のいずれか1項に記載の方法。
- 前記光検出器が、350nm〜450nm、450nm〜550nm、550nm〜650nm、650nm〜750nm、750nm〜850nm、および850nm〜950nmから選択される少なくとも1つの範囲の放射光を検出する、請求項5に記載の方法。
- 前記多孔質膜がディスクを含む、請求項1〜6のいずれか1項に記載の方法。
- 前記多孔質膜が、350nm〜1000nmの範囲の波長を有する光に曝露されたときに実質的に非自家蛍光性である、請求項1〜7のいずれか1項に記載の方法。
- 前記多孔質膜が、前記多孔質膜を流体は通過するが細胞は前記多孔質膜に保持されるように1μm未満の平均直径を有する複数の孔を画定している、請求項1〜8のいずれか1項に記載の方法。
- 前記多孔質膜が、1μm〜3,000μm;10μm〜2,000μm;および100μm〜1,000μmからなる群から選択される範囲の厚さを有する、請求項1〜9のいずれか1項に記載の方法。
- 前記流体透過性支持部材が、0.1mm〜10mm;0.5mm〜5mm;および1mm〜3mmからなる群から選択される範囲の厚さを有する、請求項1〜10のいずれか1項に記載の方法。
- 前記光源からの光によって活性化されると蛍光事象を生成する複数の蛍光粒子を前記多孔質膜上に収集するステップをさらに含む、請求項1〜11のいずれか1項に記載の方法。
- 前記液体サンプルの少なくとも一部における生存細胞の量を決定するステップをさらに含む、請求項1〜12のいずれか1項に記載の方法。
- 前記生存細胞の前記多孔質膜における位置を決定するステップをさらに含む、請求項1〜13のいずれか1項に記載の方法。
- ステップ(d)の後に、前記多孔質膜によって収集された前記生存細胞が成長および/または増殖できる条件下で前記多孔質膜を培養するステップをさらに含む、請求項1〜14のいずれか1項に記載の方法。
- 前記生存細胞の属および/または種を特定するステップをさらに含む、請求項1〜15のいずれか1項に記載の方法。
- 前記スキャンするステップ(c)が、前記多孔質膜上の入れ子状円形パターンおよび螺旋パターンの少なくとも1つを光ビームでトレースするステップを含む、請求項1〜16のいずれか1項に記載の方法。
- ステップ(b)の前、ステップ(b)の最中、またはステップ(b)の前および最中に、細胞増殖できる条件下で前記生存細胞が培養される、請求項1〜17のいずれか1項に記載の方法。
- 前記多孔質膜上に配置された前記生存細胞が、細胞増殖ができる条件下で培養される、請求項18に記載の方法。
- ステップ(b)の後であるが、ステップ(c)の前に、細胞増殖ができる条件下で前記生存細胞が培養される、請求項1〜19のいずれか1項に記載の方法。
- ステップ(c)において、前記多孔質膜を、30rpm〜1000rpmの速度で回転する、請求項1記載の方法。
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- 2013-05-02 JP JP2015510465A patent/JP6482459B2/ja active Active
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EP2780707B1 (en) | 2016-02-24 |
JP2015517656A (ja) | 2015-06-22 |
CN104755931A (zh) | 2015-07-01 |
CN104755931B (zh) | 2016-08-31 |
EP2780707A1 (en) | 2014-09-24 |
US20180120231A1 (en) | 2018-05-03 |
US20130323745A1 (en) | 2013-12-05 |
WO2013166337A1 (en) | 2013-11-07 |
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