title: "Off-on" red-emitting fluorescent probes with large Stokes shifts for nitric oxide imaging in living cells.
abstract: Fluorescent probes with larger Stokes shifts in the far-visible and near-infrared spectral region (600-900 nm) are more superior for cellular imaging and biological analysis due to avoiding light scattering interference, reducing autofluorescence from biological sample and encouraging deeper tissue penetration in vivo imaging. In this work, two bis-methoxyphenyl-BODIPY fluorescent probes for the detection of nitric oxide (NO) have been firstly synthesized. Under physiological conditions, these probes can react with NO to form the corresponding triazoles with 250- and 70-fold turn-on fluorescence emitting at 590 and 620 nm, respectively. Moreover, the triazole forms of these probes have large Stokes shifts of 38 nm, in contrast to 10 nm of existing BODIPY probes for NO. Excellent selectivity has been observed against other reactive oxygen/nitrogen species, ascorbic acid and biological matrix. After the evaluation of MTT assay, new fluorescent probes have been successfully applied to fluorescence imaging of NO released from RAW 264.7 macrophages by co-stimulation of lipopolysaccharide and interferon-γ. The experimental results indicate that our fluorescent probes can be powerful candidates for fluorescence imaging of NO due to the low background interference and high detection sensitivity.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine, Ministry of Education, Department of Chemistry, Wuhan University, Wuhan, 430072, China.
authors.forename: Jian-Bo
authors.initials: JB
authors.lastname: Chen
authors.forename: Hui-Xian
authors.initials: HX
authors.lastname: Zhang
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Guo
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Hua-Shan
authors.initials: HS
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000737:chemistry; D001896:Boron Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D002460:Cell Line; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007371:Interferon-gamma / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008262:Macrophage Activation / Q000187:drug effects; D008264:Macrophages / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D057054:Molecular Imaging / Q000379:methods*; D009569:Nitric Oxide / Q000032:analysis* / Q000096:biosynthesis; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D014230:Triazoles / Q000737:chemistry
chemical_list: C095489:4,4-difluoro-4-bora-3a,4a-diaza-s-indacene; D001896:Boron Compounds; D005456:Fluorescent Dyes; D008070:Lipopolysaccharides; D014230:Triazoles; D009569:Nitric Oxide; D007371:Interferon-gamma; D001205:Ascorbic Acid