title: Thioether-Bonded Fluorescent Probes for Deciphering Thiol-Mediated Exchange Reactions on the Cell Surface.
abstract: Study on the processes of the thiol-mediated disulfide exchange reactions on the cell surface is not only important to our understanding of extracellular natural bioreduction processes but to the development of novel strategies for the intracellular delivery of synthetic bioactive molecules. However, disulfide-bonded probes have their intrinsic inferiority in exploring the detailed exchange pathway because of the bidirectional reactivity of disulfide bonds toward reactive thiols. In this work, we developed thioether-bonded fluorescent probes that enable us to explore thiol-mediated thioether (and disulfide) exchange reactions on the cell surface through fluorescence recovery and/or cell imaging. We demonstrated that our thioether-bonded probes can be efficiently cleaved through thiol-thioether exchanges with exofacial protein thiols and/or glutathione (GSH) efflux. The exchanges mainly take place on the cell surface, and GSH efflux-mediated exchange reactions can take place without the requirement of pre-exchanges of the probes with cell surface-associated protein thiols. On the basis of our founder methodology, for the first time we demonstrated the interplay of exofacial protein thiols and GSH efflux on the cleavage of external thioether-bonded compounds. Moreover, given that an understanding of the process of GSH efflux and the mechanism on which it relies is crucial to our understanding of the cellular redox homeostasis and the mechanism of multidrug resistance, we expect that our thioether-bonded probes and strategies would greatly benefit the fundamental study of GSH efflux in living cells.
authors.affiliation: The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, 361005, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Gao
authors.affiliation: The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, 361005, P.R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, 361005, P.R. China.
authors.forename: Jinghui
authors.initials: J
authors.lastname: Wang
authors.affiliation: The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, 361005, P.R. China.
authors.forename: Yibing
authors.identifier: 0000-0001-9349-1213
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, 361005, P.R. China.
authors.forename: Chuanliu
authors.identifier: 0000-0003-2946-7299
authors.initials: C
authors.lastname: Wu
mesh_terms: D005434:Flow Cytometry; D005456:Fluorescent Dyes / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D015394:Molecular Structure; D061848:Optical Imaging; D013438:Sulfhydryl Compounds / Q000737:chemistry / Q000378:metabolism*; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005456:Fluorescent Dyes; D013438:Sulfhydryl Compounds; D013440:Sulfides