Abstract
Thiols (-SH) play various roles in biological systems. They are divided into protein thiols (PSH) and non-protein thiols (NPSH). Due to the significant roles thiols play in various physiological/pathological functions, numerous analytical methods have been developed for thiol assays. Most of these methods are developed for glutathione, the major form of NPSH. Majority of these methods require tissue/cell homogenization before analysis. Due to a lack of effective thiol-specific fluorescent/fluorogenic reagents, methods for imaging and quantifying thiols in live cells are limited. Determination of an analyte in live cells can reveal information that cannot be revealed by analysis of cell homogenates. Previously, we reported a thiol-specific thiol-sulfide exchange reaction. Based on this reaction, a benzofurazan sulfide thiol-specific fluorogenic reagent was developed. The reagent was able to effectively image and quantify total thiols (PSH+NPSH) in live cells through fluorescence microscopy. The reagent was later named as GUALY’s reagent. Here we would like to report an extension of the work by synthesizing a novel benzofurazan sulfide triphenylphosphonium derivative [(((7,7′-thiobis(benzo[c][1,2,5]oxadiazole-4,4′-sulfonyl))bis(methylazanediyl))bis(butane-4,1-diyl))bis(triphenylphosphonium) (TBOP)]. Like GUALY’s reagent, TBOP is a thiol-specific fluorogenic agent that is non-fluorescent but forms fluorescent thiol adducts in a thiol-specific fashion. Different than GUALY’s reagent, TBOP reacts only with NPSH but not with PSH. TBOP was effectively used to image and quantify NPSH in live cells using fluorescence microscopy. TBOP is a complementary reagent to GUALY’s reagent in determining the roles of PSH, NPSH, and total thiols in thiol-related physiological/pathological functions in live cells through fluorescence microscopy.
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Acknowledgements
The authors would like to thank Professor Adam Hoppe of the Chemistry and Biochemistry Department, Professor Michael Hildreth of Biology and Microbiology, and Professor Hemachand Tummala of Pharmaceutical Sciences for technical assistance in fluorescence microscopy experiments and valuable discussion. The authors also would like to thank Professor Teresa Seefeldt for proofreading the manuscript. This work was supported by grants from the National Institutes of Health (1R15GM093678-01; 1R15GM107197-01A1).
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Yang, Y., Guan, X. Non-protein thiol imaging and quantification in live cells with a novel benzofurazan sulfide triphenylphosphonium fluorogenic compound. Anal Bioanal Chem 409, 3417–3427 (2017). https://doi.org/10.1007/s00216-017-0285-y
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DOI: https://doi.org/10.1007/s00216-017-0285-y