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Chronic methamphetamine increases fighting in mice.

Boris P Sokolov1, Charles W Schindler, Jean Lud Cadet

  • 1Molecular Neuropsychiatry Branch, National Institute on Drug Abuse, NIH, DHHS, 5500 Nathan Shock Drive, Baltimore, MD 21224, USA.

Pharmacology, Biochemistry, and Behavior
|January 31, 2004
PubMed
Summary
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Chronic methamphetamine (METH) exposure increases aggression in mice, not hyperactivity. Repeated METH administration enhances fighting behaviors and alters social interactions, suggesting a model for studying aggressiveness.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Chronic methamphetamine (METH) abuse is linked to increased violent behaviors.
  • The neurobiological underpinnings of METH-induced aggression require further investigation.

Purpose of the Study:

  • To investigate the effects of chronic versus single methamphetamine exposure on aggressive behaviors in mice.
  • To determine if METH-induced aggression is secondary to hyperactivity or other behavioral changes.

Main Methods:

  • Mice were subjected to chronic (8-week intermittent) or single METH administration.
  • Aggressive behaviors, including bite attacks and latency to attack, were assessed.
  • Locomotor activity and persistent sniffing were measured to control for confounding factors.

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Main Results:

  • Single METH injection did not increase fighting behavior.
  • Chronic METH administration significantly increased the incidence and initiation of bite attacks.
  • Latency to the first attack was reduced after chronic METH exposure.
  • Increased fighting was not attributable to METH-induced hyperactivity or altered sniffing duration at later time points.

Conclusions:

  • Repeated methamphetamine administration increases fighting behaviors and modifies social interactions in mice.
  • Intermittent METH administration may serve as a valuable pharmacological model for studying the neurobiological basis of aggression.