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Body temperature effect on methylenedioxymethamphetamine-induced acute decrease in tryptophan hydroxylase activity

S Che1, M Johnson, G R Hanson

  • 1Department of Pharmacology and Toxicology, University of Utah, Salt Lake City 84112, USA.

European Journal of Pharmacology
|December 7, 1995
PubMed
Summary
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Body temperature significantly influences the acute decrease in brain tryptophan hydroxylase activity following 3,4-methylenedioxymethamphetamine administration. Hypothermia prevents this decrease, suggesting a role for body temperature in the drug

Area of Science:

  • Neuroscience
  • Pharmacology
  • Biochemistry

Background:

  • 3,4-methylenedioxymethamphetamine (MDMA) acutely decreases brain tryptophan hydroxylase (TPH) activity.
  • The influence of body temperature on this neurochemical change is not well understood.

Purpose of the Study:

  • To investigate the role of body temperature in the acute reduction of TPH activity induced by MDMA.
  • To explore the potential involvement of free radicals in MDMA's effect on TPH activity.

Main Methods:

  • Rats were administered MDMA and exposed to conditions inducing hyperthermia (25°C) or hypothermia (6°C).
  • TPH activity was measured in brain regions (hippocampus, striatum, frontal cortex).
  • The effect of a free radical scavenger, N-tert-butyl-alpha-phenylnitrone (PBN), was assessed.

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Main Results:

  • MDMA-induced hyperthermia correlated with a significant decrease in TPH activity.
  • MDMA did not alter TPH activity in hypothermic rats.
  • PBN administration attenuated the MDMA-induced decrease in TPH activity and prevented hyperthermia, but lost protective effects under hyperthermic conditions.

Conclusions:

  • Body temperature plays a critical role in the acute MDMA-induced decrease in brain TPH activity.
  • Hypothermia appears to protect against MDMA's detrimental effects on TPH activity, potentially by reducing free radical formation.
  • These findings highlight the importance of thermoregulation in MDMA neurotoxicity.