Detection and Imaging of Nitric Oxide with Novel Fluorescent Indicators: Diaminofluoresceins
摘要:
一氧化氮是一种气态自由基,它既是细胞内的第二信使,也是可扩散的细胞间信使。为了直接证明一氧化氮在体内的功能,我们设计并合成了二氨基荧光素(DAFs),作为一氧化氮的新型荧光指示剂。DAFs 的荧光化学变化是基于芳香族环状二胺在二氧存在下与 NO 的反应性。DAFs 的 N-亚硝基化反应生成了高绿色荧光的三唑形式,具有特异性、灵敏度高、操作简单等优点,可直接检测 NO(检测限为 5 nM)。DAF 被 NO 转化后,荧光量子效率提高了 100 多倍。利用可见光激发的荧光检测和高灵敏度,可以对活细胞中的 NO 生成进行实际检测。膜渗透性 DAF-2 diacetate(DAF-2 DA)可用于对 NO 进行实时生物成像,并具有较高的时间和空间分辨率。将染料装入活化的大鼠主动脉平滑肌细胞,细胞内酯酶水解酯键,生成 DAF-2。细胞内的荧光增加与 NO 浓度有关。
Detection and Imaging of Nitric Oxide with Novel Fluorescent Indicators: Diaminofluoresceins
摘要:
一氧化氮是一种气态自由基,它既是细胞内的第二信使,也是可扩散的细胞间信使。为了直接证明一氧化氮在体内的功能,我们设计并合成了二氨基荧光素(DAFs),作为一氧化氮的新型荧光指示剂。DAFs 的荧光化学变化是基于芳香族环状二胺在二氧存在下与 NO 的反应性。DAFs 的 N-亚硝基化反应生成了高绿色荧光的三唑形式,具有特异性、灵敏度高、操作简单等优点,可直接检测 NO(检测限为 5 nM)。DAF 被 NO 转化后,荧光量子效率提高了 100 多倍。利用可见光激发的荧光检测和高灵敏度,可以对活细胞中的 NO 生成进行实际检测。膜渗透性 DAF-2 diacetate(DAF-2 DA)可用于对 NO 进行实时生物成像,并具有较高的时间和空间分辨率。将染料装入活化的大鼠主动脉平滑肌细胞,细胞内酯酶水解酯键,生成 DAF-2。细胞内的荧光增加与 NO 浓度有关。
A compound represented by the following formula (I):
wherein R1 and R2 represent amino group that substitute at adjacent positions on the phenyl ring, provided that either of R1 and R2 represents a mono(C1-6 alkyl)-substituted amino group and the other represents an unsubstituted amino group; and R3 and R4 independently represent hydrogen atom or an acyl group, and an agent for measurement of nitrogen monoxide which comprises said compound.
A compound represented by the following general formula:
1
wherein R
1
and R
2
represent amino groups present at adjacent positions each other on the phenyl ring; R
3
, R
4
, R
5
and R
6
independently represent a C
1-6
alkyl group; R
7
, R
8
, R
9
and R
10
independently represent a hydrogen atom, a C
1-6
alkyl group, an allyl group, or a halogen atom; R
11
represents a hydrogen atom or a C
1-18
alkyl group; and X
−
represents an anion, and an agent for nitric oxide measurement comprising said compound.
The compound efficiently reacts with nitric oxide to give a fluorescent compound that emits strong fluorescence by irradiation with excitation light of a long wavelength. This fluorescent compound is characterized in that said compound is detectable in a fluorescence wavelength range hardly influenced by autofluorescence of cells, and its fluorescence intensity is not attenuated under an acidic condition.
A compound represented by the following formula (I):
1
wherein R
1
and R
2
represent amino groups that substitute at adjacent positions on the phenyl ring, provided that either of R
1
and R
2
represents a mono(C
1-6
alkyl)-substituted amino group and the other represents an unsubstituted amino group; and R
3
and R
4
independently represent hydrogen atom or an acyl group, and an agent for measurement of nitrogen monoxide which comprises said compound.
A compound represented by the following general formula:
wherein R1 and R2 represent amino groups present at adjacent positions each other on the phenyl ring; R3, R4, R5 and R6 independently represent a C1-6 alkyl group; R7, R8, R9 and R10 independently represent a hydrogen atom, a C1-6 alkyl group, an allyl group, or a halogen atom; R11 represents a hydrogen atom or a C1-18 alkyl group; and X- represents an anion, and an agent for nitric oxide measurement comprising said compound.
The compound efficiently reacts with nitric oxide to give a fluorescent compound that emits strong fluorescence by irradiation with excitation light of a long wavelength. This fluorescent compound is characterized in that said compound is detectable in a fluorescence wavelength range hardly influenced by autofluorescence of cells, and its fluorescence intensity is not attenuated under an acidic condition.