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Area of Science:

  • Neuroendocrinology
  • Behavioral Pharmacology
  • Sex Differences in Addiction

Background:

  • Sex and hormonal differences impact cocaine responses in humans and animal models.
  • Cocaine affects progestogens (progesterone) and their metabolites, but neuroendocrine effects during initial use are understudied.
  • Progestogen formation may underlie sex differences in early cocaine responses.

Purpose of the Study:

  • To investigate the role of progestogens in sex differences in response to acute cocaine administration.
  • To examine cocaine's neuroendocrine effects on progesterone (P) and 5alpha-pregnan-3alpha-ol-20-one (3alpha,5alpha-THP) levels.
  • To assess cocaine's impact on psychomotor stimulation, anxiety, and sexual behaviors in relation to hormonal status.

Main Methods:

  • Male and female rats were administered varying doses of cocaine (0-20 mg/kg).
  • Rats were studied during high (proestrous) or low (diestrous) progestogen phases of their estrous cycle.
  • Cocaine's effects on P and 3alpha,5alpha-THP levels, psychomotor activity, anxiety, and sexual behaviors were measured.

Main Results:

  • Cocaine administration resulted in U-shaped dose-response curves for progestogens and anxiety-like behaviors.
  • Enhanced psychomotor stimulation correlated with increased P and/or 3alpha,5alpha-THP levels post-cocaine.
  • Male rats showed less susceptibility to cocaine's progestogen- and anxiety-related effects compared to females.

Conclusions:

  • Progestogen levels and hormonal milieu significantly interact with the neuroendocrine and behavioral effects of cocaine.
  • Sex differences in cocaine response are partly mediated by hormonal fluctuations and progestogen formation.
  • These findings highlight the complexity of hormonal influences on cocaine's acute effects and initiation phase responses.