JP6621620B2 - 血液分析方法ならびにそれに用いる染色液および血液分析装置 - Google Patents
血液分析方法ならびにそれに用いる染色液および血液分析装置 Download PDFInfo
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Description
測定試料は、フローサイトメータに流し測定を行うための試料であり、検体として血液、上記の式1で示される蛍光色素(ヘキスト34580)および検体希釈液を含む。測定試料中における蛍光色素の濃度の下限は、0.15μM、好ましくは0.16μM、より好ましくは0.18μMである。測定試料中における蛍光色素の濃度の上限は、1.0μM、好ましくは0.95μM、より好ましくは0.89μMである。測定試料中における蛍光色素の濃度の具体的数値は、例えば0.15、0.18、0.2、0.25、0.3、0.35、0.36、0.4、0.45、0.5、0.55、0.6、0.62、0.65、0.7、0.75、0.8、0.85、0.89、0.9、0.95、1.0(単位:μM)であり得る。
上記の式1で示される蛍光色素は、CAS番号911004−45−0で当業者に周知であり、ヘキスト34580とも呼ばれる。この蛍光色素は、RNAよりもDNAを強く染色するDNA選択的蛍光色素である。上記の蛍光色素は、例えば青紫色レーザ光(波長が約405nm)により励起することができる。上記の蛍光色素は、公知の方法に従って合成してもよいし、市販品を用いてもよい。
検体希釈液は、赤血球を可溶化する溶血剤、好ましくは界面活性剤を含む。界面活性剤としては、例えばラウリルトリメチルアンモニウムクロライド、ステアリルトリメチルアンモニウムクロライド、ミリスチルトリメチルアンモニウムクロライドおよびセチルトリメチルアンモニウムクロライド等のカチオン系界面活性剤、ドデシル硫酸ナトリウム等のアニオン系界面活性剤、CHAPS等の両性界面活性剤、PBC-44等のノニオン系界面活性剤、あるいはこれらの混合物が挙げられる。界面活性剤は、好ましくはラウリルトリメチルアンモニウムクロライド、ステアリルトリメチルアンモニウムクロライドおよびPBC-44である。より好ましくは、溶血剤は、赤血球膜に対する溶解力が異なる少なくとも2種類の界面活性剤を含む。このような少なくとも2種類の界面活性剤の組合せとしては、具体的にはラウリルトリメチルアンモニウムクロライドとステアリルトリメチルアンモニウムクロライドとPBC-44との組合せ、ミリスチルトリメチルアンモニウムクロライドとセチルトリメチルアンモニウムクロライドとの組合せ等が挙げられ、好ましくはラウリルトリメチルアンモニウムクロライドとステアリルトリメチルアンモニウムクロライドとPBC-44との組合せである。
検体となる血液は、血液の通った生体から採取されたものであれば特に限定されない。生体はヒトまたは鶏、サル等のヒト以外の動物であってもよく、好ましくはヒトである。生体は、網赤血球(RET)高値検体またはマラリア感染率の低い検体であってもよい。血液は、当業者に公知の方法、例えば採血等によって生体から取得することができる。
測定試料の調製方法は特に限定されず、当業者に公知の方法に従って調製することができる。例えば、検体となる血液、上記の蛍光色素(好ましくは上記の蛍光色素を含む染色液)および検体希釈液を混合することによって調製することができる。
培養マラリア原虫(国立大学法人大阪大学微生物病研究所から入手;以下「Malaria」と言う場合がある)を添加したヒト全血(ACD採血・O型)(Golden West社製) 17μlに、染色液20μlおよび検体希釈液1mlを添加し、41℃で20秒間混合し、測定試料を調製した。染色液および検体希釈液は以下のとおりにして調製した。
以下の表3に示す組成の染色液を用いて、比較例1と同様の実験を行った。
マラリア感染ヒト全血に代えて、マラリアに感染しており且つ網赤血球(RET)が高値の患者から採取された血液を用いて、実施例1と同様の実験を行った。
マラリア感染ヒト全血に代えて、マラリアの感染率の低い患者から採取された血液を用いて、実施例1と同様の実験を行った。
ヘキスト34580に代えて、4',6-ジアミジノ-2-フェニルインドールジヒドロクロリド(DAPI、ライフテクノロジーズコーポレーション)を用いて調製した以下の表4に示す組成の染色液を用いて、実施例1と同様の実験を行った。
以下の表5に示す組成を有する染色液を用いて、実施例1と同様の実験を行った。なお、測定試料を調製した際、染色液は、表5の右欄に示される「測定試料中の濃度」の値となるように添加した。
Claims (10)
- 血液、下式1で示される蛍光色素および検体希釈液から、前記蛍光色素の濃度が0.18μM以上0.89μM以下の測定試料を調製する工程と、
前記測定試料に光を照射して得られる蛍光情報を取得する工程と、
前記蛍光情報に基づいて、前記血液中のマラリア原虫に感染した赤血球を検出する工程と、を備える血液分析方法。
- 前記取得工程において、測定試料に光を照射して得られる前方散乱光情報を更に取得し、
前記検出工程において、前記前方散乱光情報に基づいて、前記血液中のマラリア原虫に感染した赤血球を更に検出する、請求項1に記載の血液分析方法。 - 前記蛍光色素のカウンターイオンがハロゲン化物イオンである、請求項1または2に記載の血液分析方法。
- 前記蛍光色素のカウンターイオンがCl−である、請求項1乃至3の何れか一項に記載の血液分析方法。
- 前記検体希釈液は、赤血球膜に対する溶解力が異なる少なくとも2種類の界面活性剤を含む、請求項1乃至4の何れか一項に記載の血液分析方法。
- 前記検体希釈液のpHが5.0以上7.0以下である、請求項1乃至5の何れか一項に記載の血液分析方法。
- 前記検体希釈液の赤血球に対する浸透圧が、200mOsm/kg・H2O以上300mOsm/kg・H2O以下である、請求項1乃至6の何れか一項に記載の血液分析方法。
- 下式1で示される前記蛍光色素を含み、前記蛍光色素の濃度が3μM以上200μM以下であり、請求項1乃至7の何れか一項に記載の血液分析方法に用いるためのマラリア分析用染色液。
- 溶媒がエチレングリコールである、請求項8に記載のマラリア分析用染色液。
- 血液、下式1で示される蛍光色素および検体希釈液から、前記蛍光色素の濃度が0.18μM以上0.89μM以下の測定試料を調製する測定試料調製部と、
前記測定試料に光を照射する光源部と、
光が照射された前記測定試料から得られる蛍光情報を取得する検出部と、
前記蛍光情報に基づいて、前記血液中のマラリア原虫に感染した赤血球を検出する制御部と、を備える血液分析装置。
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