Bioimaging of nitric oxide with fluorescent indicators based on the rhodamine chromophore.
Diaminofluoresceins are widely used for detection and imaging of nitric oxide (NO), but for biological applications, they have the disadvantages that the fluorescence of the fluorescein chromophore is pH-sensitive and overlaps the autofluorescence of cells. We have developed a membrane-permeable fluorescent indicator for NO based on the rhodamine chromophore, DAR-4M AM, which can be excited with 550-nm light. The fluorescence quantum yield of the product after reaction with NO is 840 times higher than that of DAR-4M. The detection limit of NO was 7 nM, and the fluorescence showed no pH dependency above pH 4. DAR-4M AM was successfully applied to practical bioimaging of NO produced in bovine aortic endothelial cells.
Kojima
H
H
Graduate School of Pharmaceutical Sciences, and Second Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
Hirotani
M
M
Nakatsubo
N
N
Kikuchi
K
K
Urano
Y
Y
Higuchi
T
T
Hirata
Y
Y
Nagano
T
T
D000818:Animals; D001011:Aorta / Q000166:cytology; D001921:Brain / Q000378:metabolism; D002417:Cattle; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid; D004730:Endothelium, Vascular / Q000737:chemistry / Q000166:cytology; D005456:Fluorescent Dyes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D015394:Molecular Structure; D009569:Nitric Oxide / Q000032:analysis*; D010784:Photomicrography; D051381:Rats; D017207:Rats, Sprague-Dawley; D012235:Rhodamines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
D005456:Fluorescent Dyes; D012235:Rhodamines; D009569:Nitric Oxide