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Medroxyprogesterone acetate and tamoxifen do not decrease aggressive behavior in CF-1 male mice.

N G Simon1, M Perry

  • 1Department of Psychology, Lehigh University, Bethlehem, PA 18015.

Pharmacology, Biochemistry, and Behavior
|August 1, 1988
PubMed
Summary
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Medroxyprogesterone acetate (MPA) and tamoxifen (TAM) did not reduce aggression in male mice. Tamoxifen even increased aggression, suggesting complex hormonal interactions affecting behavior.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Behavioral Science

Background:

  • Hormones like androgens and estrogens significantly influence male aggressive behaviors.
  • Anti-androgens and anti-estrogens are used clinically, but their effects on behavior require further investigation.

Purpose of the Study:

  • To investigate the effects of medroxyprogesterone acetate (MPA) and tamoxifen (TAM) on aggressive behavior in male mice.
  • To determine if these hormonal modulators alter testosterone-facilitated behaviors.

Main Methods:

  • Intact male CF-1 mice received daily injections of MPA, TAM, or a combination for 20 days.
  • Aggressive behavior was assessed by testing interactions with bulbectomized stimulus males.
  • Testis and seminal vesicle weights were measured post-treatment.

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Main Results:

  • No significant decrease in fighting behavior was observed with MPA, TAM, or combination treatments.
  • Tamoxifen (TAM) administration led to increased aggression, even when combined with MPA.
  • MPA reduced testis weight, while both MPA and TAM decreased seminal vesicle weight.

Conclusions:

  • MPA and TAM are ineffective in reducing aggressive behavior in this mouse model.
  • TAM may paradoxically increase aggression, highlighting complex anti-estrogen effects.
  • These findings have implications for the clinical use of these drugs in modulating testosterone-dependent behaviors.