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Related Experiment Videos

Cyproterone acetate displaces opiate binding in mouse brain

M Gutiérrez1, L Menéndez, M Ruiz-Gayo

  • 1Departamento de Medicina, Facultad de Medicina, Oviedo, Spain.

European Journal of Pharmacology
|June 5, 1997
PubMed
Summary

Cyproterone acetate, an antiandrogen, directly binds to opiate receptors in the brain. This interaction occurs independently of its known effects on androgen receptors, suggesting a novel mechanism of action for this drug.

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Area of Science:

  • Neuropharmacology
  • Endocrinology
  • Receptor Binding Assays

Background:

  • Androgen receptor modulators influence opioid signaling in the central nervous system.
  • A direct interaction between antiandrogens and opioid receptors requires investigation.

Purpose of the Study:

  • To determine if cyproterone acetate and other compounds interact directly with opioid receptors.
  • To elucidate the binding characteristics of cyproterone acetate to mouse brain membranes.

Main Methods:

  • Radioligand binding assays using [3H]diprenorphine.
  • Incubation of mouse brain membranes with cyproterone acetate, flutamide, 5alpha-dihydrotestosterone, and progesterone.
  • Analysis of IC50 values and association rates.

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Main Results:

  • Cyproterone acetate demonstrated inhibitory activity against [3H]diprenorphine binding.
  • The IC50 for cyproterone acetate was determined to be (1.62 +/- 0.33) x 10(-6) M.
  • Cyproterone acetate did not alter the association rate of [3H]diprenorphine binding.

Conclusions:

  • Cyproterone acetate exhibits direct binding to opiate receptors.
  • This binding is independent of cyproterone acetate's classical antiandrogen activity.
  • Suggests a potential novel mechanism for cyproterone acetate's effects on the central nervous system.