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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Radical Scavenging Is Not Involved in Thymoquinone-Induced Cell Protection in Neural Oxidative Stress Models.

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Thymoquinone (TQ) from Nigella sativa does not scavenge superoxide radicals. However, TQ protects dopaminergic neurons from oxidative stress by modulating caspase-3 activity and increasing glutathione levels.

Keywords:
MPP+neuroblastoma cell lineneuronal cell cultureoxidative stressprimary mesencephalic cell culturerotenonesuperoxide radical scavengingthymoquinone

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Biochemistry

Background:

  • Thymoquinone (TQ), derived from Nigella sativa seeds, is recognized for its pharmacological relevance.
  • Previous assumptions about TQ's direct radical scavenging abilities are challenged by its in-plant synthesis pathway.
  • This study aims to clarify TQ's actual radical scavenging properties and elucidate its mechanism of action.

Purpose of the Study:

  • To re-evaluate the radical scavenging properties of Thymoquinone (TQ).
  • To investigate the mode of action of TQ in cellular models of oxidative stress and mitochondrial impairment.
  • To assess TQ's protective effects on dopaminergic neurons.

Main Methods:

  • Utilized N18TG2 neuroblastoma cells and primary mesencephalic cells.
  • Induced oxidative stress using rotenone and MPP+.
  • Assessed dopaminergic neuron protection via tyrosine hydroxylase staining.
  • Quantified superoxide radicals using electron paramagnetic resonance (EPR).
  • Measured mitochondrial membrane potential, ATP production, ROS levels, caspase-3 activity, and glutathione levels.

Main Results:

  • TQ did not directly scavenge superoxide radicals; initial EPR suggested an increase in superoxide levels.
  • TQ demonstrated significant protection of dopaminergic neurons against oxidative stress.
  • Mitochondrial membrane potential showed a tendency to decrease, while ATP production remained largely unaffected.
  • Total ROS levels were unaltered; however, glutathione levels increased in both cell systems.
  • TQ decreased caspase-3 activity in primary mesencephalic cells but increased it in neuroblastoma cells.

Conclusions:

  • TQ lacks direct superoxide radical scavenging activity.
  • TQ protects dopaminergic neurons via mechanisms involving reduced caspase-3 activity and enhanced glutathione levels, particularly in primary mesencephalic cells.
  • TQ's pro-apoptotic effect in neuroblastoma cells may contribute to its anti-cancer properties.