Psychopharmacology

, 198:301 | Cite as

The effects of methamphetamine on core body temperature in the rat—PART 1: chronic treatment and ambient temperature

  • Benita J. Myles
  • Lee Ann Jarrett
  • Susan L. Broom
  • H. Anton Speaker
  • Karen E. Sabol
Original Investigation

Abstract

Rationale

Stimulants such as methamphetamine (METH) alter core temperature in a manner that is dependent on ambient temperature and that shows tolerance after chronic use. Our objectives were to (1) determine whether tolerance to METH-induced hyperthermia was a consequence of neurotoxicity to dopamine or serotonin and (2) determine the relationship between ambient temperature and chronic treatment on the METH-induced temperature response.

Materials and methods

Rats were treated with 1.0, 5.0, or 10.0 mg/kg METH at 24°C (experiment 1) or treated with 5.0 mg/kg METH at 20°C, 24°C, or 28°C (experiment 2). Treatment occurred for 12 days, and temperature measurements were made once per minute telemetrically during 7-h sessions in computer-regulated environments.

Results

Peak increases in core temperature occurred at 60 min post-treatment for the 1.0 and 10.0 mg/kg doses, and at 180 min for the 5.0 mg/kg dose. Tolerance-like effects were seen with chronic 5.0 (mixed results) and 10.0 mg/kg METH in the absence of dopamine or serotonin depletions measured 2 weeks after the completion of treatment. After 5.0 mg/kg METH, variations in ambient temperature resulted in an early flexible change in core temperature (phase 1) (hyperthermia at 28° and hypothermia at 20°) and a later inflexible hyperthermia (phase 2).

Conclusions

The results suggest that (1) the peak effect of different doses of METH occurs at different times (24°), (2) the diminished temperature response with chronic METH treatment was not associated with long-term dopamine and serotonin depletions, and (3) a two-phase temperature response to METH may reflect two independent mechanisms.

Keywords

Drug abuse Methamphetamine Temperature Rat Tolerance 

Notes

Acknowledgment

This paper was supported by Biomedical Research Internship, NIH PHS IR25 GM55379, NIDA 08588, and the University of Mississippi Faculty Research Small Grants Program.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Benita J. Myles
    • 2
  • Lee Ann Jarrett
    • 1
  • Susan L. Broom
    • 1
  • H. Anton Speaker
    • 1
  • Karen E. Sabol
    • 1
    • 2
  1. 1.Department of PsychologyUniversity of MississippiUniversityUSA
  2. 2.Department of PharmacologyUniversity of MississippiUniversityUSA

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