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Antioxidant activity of 3-methyl-1-phenyl-2-pyrazolin-5-one

Y Yamamoto1, T Kuwahara1, K Watanabe2

  • 1a Research Center for Advanced Science and Technology , University of Tokyo , Tokyo , Japan.

Redox Report : Communications in Free Radical Research
|July 14, 2016
PubMed

Insights

The anti-ischemic agent 3-methyl-1-phenyl-2-pyrazolin-5-one (MCI-186) demonstrates potent antioxidant activity. It effectively inhibits lipid peroxidation in liposomal membranes, suggesting its potential as an antioxidant in biological systems.

Area of Science:

  • Biochemistry
  • Medicinal Chemistry

Background:

  • The anti-ischemic agent 3-methyl-1-phenyl-2-pyrazolin-5-one (MCI-186) possesses antioxidant properties.
  • Understanding its antioxidant mechanism is crucial for its therapeutic applications.

Purpose of the Study:

  • To investigate the antioxidant activity and mechanism of MCI-186.
  • To evaluate its efficacy in inhibiting lipid peroxidation in liposomal membranes.

Main Methods:

  • Assessed the oxidation rate of MCI-186 at varying pH levels.
  • Identified major and minor oxidation products.
  • Examined the inhibition of phosphatidylcholine (PC) liposomal membrane oxidation using both water-soluble and lipid-soluble initiators.
  • Evaluated the synergistic effects of MCI-186 with ascorbate and α-tocopherol.

Main Results:

  • The anionic form of MCI-186, with a pKa of 7.0, exhibited higher reactivity.
  • MCI-186 effectively inhibited PC liposomal membrane oxidation initiated by both water-soluble and lipid-soluble agents.
  • Combination therapy with MCI-186 and other antioxidants (ascorbate, α-tocopherol) resulted in near-complete inhibition of oxidation.

Conclusions:

  • MCI-186 functions as a potent antioxidant by inhibiting lipid peroxidation.
  • Its efficacy in both cell-free and cellular systems suggests significant therapeutic potential.

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