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Simultaneous monitoring of intra- and extracellular nitric oxide in living cells by means of dual-color fluorescence imaging.
Nitric Oxide : Biology and Chemistry 2017 July 2
A dual-color fluorescence imaging method for simultaneous monitoring of intra- and extracellular nitric oxide (NO) was developed. Assisted by confocal laser scanning microscope, the intra- and extracellular NO can be successfully visualized by using two selected probes, 4,4-difluoro-8-(3,4-diaminophenyl)-3,5-bis(4-methoxyphenyl)-4-bora-3a,4a-diaza-s-indacene (p-MOPB) and disodium 2,6-disulfonate-1,3-dimethyl-5-hexadecyl-8-(3,4-diaminophenyl)-4,4'-difluoro-4-bora-3a,4a-diaza-s-indacene (DSDMHDAB), which display distinct membrane permeability and show different colors of fluorescence after reaction with NO. Results indicated that intra- and extracellular NO could be fluorometrically detected without mutual interference. The applicability of the proposed method was validated by dual-color imaging of NO on both sides of the plasma membrane in RAW 264.7 murine macrophages and human vascular endothelial (ECV-304) cells. This multi-labeling approach using multi-laser excitation and multi-color fluorescence detection holds great promise for simultaneous analysis of NO as well as other gasotransmitters in living cells with subcellular resolution.
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