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A Rationally Designed Reversible 'Turn-Off' Sensor for Glutathione.

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A novel reversible sensor detects decreasing levels of gamma-glutamyl-cysteinyl-glycine (GSH), crucial for cellular health. This

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Area of Science:

  • Biochemistry and Molecular Biology
  • Chemical Biology
  • Analytical Chemistry

Background:

  • Gamma-glutamyl-cysteinyl-glycine (GSH) is vital for maintaining cellular redox homeostasis.
  • Decreased cellular GSH levels are linked to various disease states.
  • Existing fluorescence probes for GSH are irreversible and signal completion, not concentration.

Purpose of the Study:

  • To develop a reversible, reaction-based sensor for detecting decreasing GSH levels.
  • To provide a tool for monitoring GSH depletion associated with disease onset.

Main Methods:

  • Design and synthesis of a novel reversible sensor (1) based on merocyanine (MC) and spiropyran (SP) isomers.
  • Investigation of the sensor's reaction with GSH in aqueous solutions.
  • Assessment of sensor selectivity against other biologically relevant analytes.
  • Cellular imaging studies using HEK 293 cells to evaluate sensor performance in a biological context.

Main Results:

  • The sensor (1) exhibits a 'turn-off' fluorescence response upon reaction with GSH, enabling quantitative detection of GSH decrease.
  • The sensor demonstrates excellent selectivity for GSH over common metal ions and aminothiols.
  • The sensor successfully permeates HEK 293 cells and detects GSH depletion induced by buthionine sulfoximine.

Conclusions:

  • The developed reversible sensor (1) offers a sensitive and selective method for monitoring declining GSH levels.
  • This sensor provides a valuable tool for studying diseases associated with GSH depletion.
  • The 'turn-off' mechanism allows for real-time assessment of GSH concentration changes.