JP7385850B2 - 細胞滞留性蛍光化合物並びにそれを用いた細胞の染色方法及び高感度検出方法 - Google Patents
細胞滞留性蛍光化合物並びにそれを用いた細胞の染色方法及び高感度検出方法 Download PDFInfo
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- HSSLDCABUXLXKM-UHFFFAOYSA-N resorufin Chemical class C1=CC(=O)C=C2OC3=CC(O)=CC=C3N=C21 HSSLDCABUXLXKM-UHFFFAOYSA-N 0.000 description 1
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Description
Aは酵素反応により切断される1価の親水基であり、
R1、R2、R3、R4及びR5は、それぞれ独立して、下記の(a)、(b)及び(c)からなる群より選択される原子又は原子団であり、
(a)水素原子、ヒドロキシル基、アルコキシル基、ハロゲン原子、アミノ基、ニトロ基、スルホン酸基、スルホンアミド基、シアノ基
(b)1又は複数の水素原子が他の原子又は原子団で置換されていてもよく、かつ炭素骨格中に、二重結合、三重結合、アミノ基、酸素原子、ケイ素原子、硫黄原子、カルボニル基、エステル結合、アミド結合、ウレタン結合及び尿素結合のいずれか1又は複数を含んでいてもよい直鎖アルキル基、分岐鎖アルキル基、シクロアルキル基、アルケニル基、アルキニル基、アリール基及びヘテロアリール基
(c)エステル基、アミド基、ウレタン基及び尿素基
R1、R3又はR5は、ベンジル位にフッ素原子を1つ又は2つ有するアルキル基であり、
R1、R2、R3、R4及びR5のいずれか1つは、疎水性の蛍光基を含み、
或いは、R1、R2、R3、R4及びR5のうち、ベンジル位にフッ素原子を1つ又は2つ有するアルキル基を除く隣り合う2つは、原子又は原子団を共有し環を形成し、当該環が結合したベンゼン環と共に疎水性の蛍光基を形成していてもよい。
Aは前記酵素標識抗体に結合した酵素に触媒される反応により切断される1価の親水基であり、
R1、R2、R3、R4及びR5は、それぞれ独立して、下記の(a)、(b)及び(c)からなる群より選択される原子又は原子団であり、
(a)水素原子、ヒドロキシル基、アルコキシル基、ハロゲン原子、アミノ基、ニトロ基、スルホン酸基、スルホンアミド基、シアノ基
(b)1又は複数の水素原子が他の原子又は原子団で置換されていてもよく、かつ炭素骨格中に、二重結合、三重結合、アミノ基、酸素原子、ケイ素原子、硫黄原子、カルボニル基、エステル結合、アミド結合、ウレタン結合及び尿素結合のいずれか1又は複数を含んでいてもよい直鎖アルキル基、分岐鎖アルキル基、シクロアルキル基、アルケニル基、アルキニル基、アリール基及びヘテロアリール基
(c)エステル基、アミド基、ウレタン基及び尿素基
R1、R3又はR5は、ベンジル位にフッ素原子を1つ又は2つ有するアルキル基であり、
R1、R2、R3、R4及びR5のいずれか1つは、疎水性の蛍光基を含み、
或いは、R1、R2、R3、R4及びR5のうち、ベンジル位にフッ素原子を1つ又は2つ有するアルキル基を除く隣り合う2つは、原子又は原子団を共有し環を形成し、当該環が結合したベンゼン環と共に疎水性の蛍光基を形成していてもよい。
(a)水素原子(-H)、ヒドロキシル基(-OH)、アルコキシル基(-OR)、ハロゲン原子(-F、-Cl、-Br、-I)、アミノ基(-NR2)、ニトロ基(-NO2)、スルホン酸基(-SO3H又はその塩)、スルホンアミド基(-SO2NR2)、シアノ基(-CN)
(b)1又は複数の水素原子が他の原子又は原子団で置換されていてもよく、かつ炭素骨格中に、二重結合、三重結合、アミノ基(-NR-)、酸素原子(-O-)、ケイ素原子(-SiR2-)、硫黄原子(-S-)、カルボニル基(-C(=O)-)、エステル結合(-O-C(=O)-)又は-C(=O)-O-)、アミド結合(-NR-C(=O)-)又は-C(=O)-NR-)、ウレタン結合(-O-C(=O)-NR-)又は-NR-C(=O)-O-)及び尿素結合(-NR-C(=O)-NR-)のいずれか1又は複数を含んでいてもよい直鎖アルキル基(例えば、炭素数1以上10以下)、分岐鎖アルキル基(例えば、炭素数1以上10以下)、シクロアルキル基(例えば、炭素数3以上10以下)、アルケニル基(末端に二重結合を含み、例えば、炭素数2以上10以下の炭化水素基)、アルキニル基(末端に三重結合を含み、例えば、炭素数2以上10以下の炭化水素基)、アリール基(1又は複数の単環式又は縮合環式芳香族環を含む炭化水素基)及びヘテロアリール基(1又は複数の単環式又は縮合環式芳香族環を含み、1又は複数の炭素原子が、酸素原子、窒素原子又は硫黄原子等のヘテロ原子で置換された原子団)
(c)エステル基(-O-C(=O)-R)又は-C(=O)-O-R)、アミド基(-NR-C(=O)-R)又は-C(=O)-NR-R)、ウレタン基(-O-C(=O)-NR-R)又は-NR-C(=O)-O-R)及び尿素基(-NR-C(=O)-NR-R)
下記のスキームにしたがって化合物1の合成を行った。
下記のスキームにしたがって化合物8の合成を行った。
下記のスキームにしたがって化合物3の合成を行った。
下記のスキームにしたがって化合物9の合成を行った。
下記のスキームにしたがって化合物10の合成を行った。
化合物1(5μM)を、β-ガラクトシダーゼ(5U/mL)とリン酸緩衝液(10mM、pH7.4)中で混合し、10分間室温で酵素反応を行った。その後、UV-VISスペクトル(株式会社島津製作所UV-2450)と蛍光スペクトル(日本分光株式会社FP-6300)を測定した。比較のため、酵素反応を行わない状態でのUV-VISスペクトル及び蛍光スペクトルの測定も行った。
CD44はA549細胞などのがん細胞表面に発現するマーカーとして知られている。本実施例では、CD44を標的としたA549細胞の蛍光染色を行った。
PD-L1は、活性化T細胞の表面に発現しているPD-1のリガンドであり、がん免疫サイクルに関与していることが知られているが、近年、肝細胞がん細胞のマーカーとしても注目されている。本実施例では、インターフェロンγ(IFN-γ)によりPD-L1を誘導したヒト肝細胞がん由来HepG2細胞を用いて、化合物1による特異的染色を試みた。
トリプシン/EDTAを用いて培養器から剥離した懸濁状態のHeLa細胞に、抗CD44抗体(アブカム社:ウサギモノクローナル抗体)(MEM培地)を接触させ、CO2インキュベーター内(37℃)で1時間放置した。洗浄後、β-ガラクトシダーゼ標識抗ウサギ抗体(アブカム社)(MEM培地)を接触させ、CO2インキュベーター内(37℃)で1時間放置した。洗浄後、化合物1又は8の20μM溶液(HBSS)を添加し、CO2インキュベーター内(37℃)で30分間インキュベート後、フローサイトメータ(ベクトン・ディッキンソン社、Fortessa X-20)を用いて細胞ごとの蛍光強度(励起 405nm, 蛍光 450/40nm BP)を測定した。。一般的な二次抗体法として、抗CD44抗体と市販の蛍光色素(Alexa405)標識抗ウサギ抗体を用いた実験を行った。
トリプシン/EDTAを用いて培養器から剥離した懸濁状態のHeLa細胞を4%PFA/PBSで固定し、1%Triton-X100/PBSで膜透過処理を行った。抗CD44抗体(アブカム社:ウサギモノクローナル抗体)(10% Blocking One/PBS)を接触させ、室温で1時間放置した。洗浄後、β-ガラクトシダーゼ標識抗ウサギ抗体(アブカム社)(0.1%Tween20/PBS)を接触させ、室温で1時間放置した。洗浄後、化合物1又は化合物8の20μM溶液(PBS)を添加し、CO2インキュベーター内(37℃)で30分間インキュベート後、フローサイトメータ(ベクトン・ディッキンソン社、Fortessa X-20)を用いて細胞ごとの蛍光強度(励起 405nm, 蛍光 450/40nm BP)を測定した。一般的な二次抗体法として、抗CD44抗体と市販の蛍光色素(Alexa405)標識抗ウサギ抗体を用いた実験を行った。
HeLa細胞に、抗CD44抗体(アブカム社:ウサギモノクローナル抗体)(MEM培地)を接触させ、CO2インキュベーター内(37℃)で1時間放置した。洗浄後、β-ガラクトシダーゼ標識抗ウサギ抗体(アブカム社)(MEM培地)を接触させ、CO2インキュベーター内(37℃)で1時間放置した。洗浄後、化合物3(HBSS)を添加し、CO2インキュベーター内(37℃)で30分間インキュベート後、蛍光顕微鏡(キーエンスBZ-X710)を用いて細胞の蛍光観察を行った。一般的な二次抗体法として、抗CD44抗体と市販の蛍光色素(Alexa488)標識抗ウサギ抗体を用いた実験を行った。
Claims (7)
- 下記の式(1)から(10)のいずれかで表される細胞滞留性蛍光化合物。
- 標的細胞の表面に発現する抗原タンパク質に対する特異性を有する抗体に酵素を結合させた酵素標識抗体を該標的細胞に結合させる工程と、
前記酵素標識抗体が結合した前記標的細胞に、下記の式(1)から(10)のいずれかで表される細胞滞留性蛍光化合物を接触させる工程を含む細胞の染色方法。
- 前記標的細胞に発現する抗原タンパク質が、上皮成長因子受容体(EGFR)、HER2、PDL-1、PDL-2、WT-1、PD-1、CCR4、CD33、CD24、CD29、CD40、CD44、CD80、CD86、CD105、CD133、CD166、CD200、ESA、CXCR4、Stro-1、EpCAM、Integrin12b1、BMI-1のいずれかであることを特徴とする請求項2に記載の細胞の染色方法。
- 前記酵素標識抗体に含まれる前記酵素がβ-ガラクトシダーゼであり、前記細胞滞留性蛍光化合物が、前記式(1)から(9)のいずれかで表されることを特徴とする請求項2又は3に記載の細胞の染色方法。
- 前記酵素標識抗体に含まれる前記酵素がアルカリホスファターゼであり、前記細胞滞留性蛍光化合物が、前記式(10)で表されることを特徴とする請求項2又は3に記載の細胞の染色方法。
- 請求項2から5のいずれか1項に記載の細胞の染色方法を用いて、標的細胞の染色を行う工程と、
蛍光法を用いて染色された前記標的細胞を検出する工程を含む細胞の高感度検出方法。 - 染色された前記標的細胞の検出にフローサイトメトリー又は蛍光イメージングを用いることを特徴とする請求項6に記載の細胞の高感度検出方法。
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JP2017512210A (ja) | 2014-02-24 | 2017-05-18 | ヴェンタナ メディカル システムズ, インク. | キノンメチドアナログシグナル増幅 |
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WO2018079859A1 (ja) | 2016-10-26 | 2018-05-03 | 国立大学法人九州大学 | 細胞の標識方法 |
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