Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 106, Issue -, Pages 329-338Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2017.02.044
Keywords
Genetically encoded redox probes; Polysulfides; HOCl; Peroxynitrite; Glutathione; H2O2; Nitric oxide
Funding
- CAPES/CNPq (Ciencia sem Fronteiras postdoctoral fellowship)
- DFG Priority Program Dynamics of thiol-based redox switches in cellular physiology [LE 2905/1-1, DI 731/3-1, SPP1710]
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The genetically encoded probes roGFP2-Orp1 and Grx1-roGFP2 have been designed to be selectively oxidized by hydrogen peroxide (H2O2) and glutathione disulfide (GSSG), respectively. Both probes have demonstrated such selectivity in a broad variety of systems and conditions. In this study, we systematically compared the its vitro response of roGFP2, roGFP2-Orp1 and Grx1-roGFP2 to increasing amounts of various oxidant species that may also occur in biological settings. We conclude that the previously established oxidant selectivity is highly robust and likely to be maintained under most physiological conditions. Yet, we also find that hypochlorous acid, known to be produced in the phagocyte respiratory burst, can lead to non-selective oxidation of roGFP2-based probes at concentrations >= 2 mu M, in vitro. Further, we confirm that polysulfides trigger direct roGFP2 responses. A side-by-side comparison of all three probes can be used to reveal micromolar amounts of hypochlorous acid or polysulfides.
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