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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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A modular trigger for the development of selective superoxide probes.

Zuo Hang Yu1, Clive Yik-Sham Chung, Fung Kit Tang

  • 1Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China. hoyuay@hku.hk.

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|August 25, 2017
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Researchers developed a novel copper-based method for detecting superoxide, creating sensitive fluorescent probes. These probes allow for imaging superoxide levels in live mammalian cells, advancing cellular analysis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Chemical Biology

Background:

  • Superoxide is a key reactive oxygen species involved in cellular signaling and disease.
  • Existing methods for superoxide detection in live cells have limitations in sensitivity and selectivity.

Purpose of the Study:

  • To develop a novel bioinspired copper-based strategy for sensitive and selective superoxide sensing.
  • To create fluorescent probes for real-time imaging of endogenous superoxide levels in live mammalian cells.

Main Methods:

  • Design and synthesis of a bioinspired copper-based fluorescent probe.
  • Evaluation of probe sensitivity and selectivity using biochemical assays.
  • Application of the probe for imaging superoxide in live HEK293T, HeLa, and A431 cells.

Main Results:

  • The developed probe exhibits a >90-fold fluorescence turn-on response to superoxide.
  • The probe demonstrates high selectivity for superoxide over other reactive oxygen species.
  • Successful imaging of endogenous superoxide variations in various live mammalian cell lines was achieved.

Conclusions:

  • The new copper-based strategy provides a sensitive and selective tool for superoxide detection.
  • This bioinspired probe enables advanced imaging of superoxide dynamics in live cells.
  • The findings contribute to a better understanding of superoxide's role in cellular processes.