Sep 18, 1998

A single dose model of methamphetamine-induced neurotoxicity in rats: effects on neostriatal monoamines and glial fibrillary acidic protein

Brain Research
Masao FukumuraCharles V Vorhees

Abstract

The neurotoxic effects of a single administration of methamphetamine (MA) were studied under conditions conducive to MA-induced hyperthermia. After a single dose of MA (10, 20, 30, or 40 mg/kg, s. c.) or saline (3 ml/kg) to Sprague-Dawley CD rats, rectal temperatures were monitored for 9 h in a room with an ambient temperature of 22.0+/-0.5 degrees C. MA induced significant dose-dependent hyperthermia, however, no significant increase in mortality occurred. Neostriatal DA, 5-HT, TH, and GFAP were assayed 3 days following treatment. MA induced dose-dependent reductions of DA, 5-HT and TH, and increased GFAP. For DA, at doses of 20, 30, or 40 mg/kg the reductions were to 71%, 49%, and 29%, and for 5-HT were to 73%, 44%, and 19% of control values. No reductions were seen after the 10 mg/kg dose. Semiquantitative analysis Western blots of TH and GFAP demonstrated that TH was reduced to 52%, 75%, and 28%, and GFAP was increased to 125%, 134%, and 149% of control values at MA doses of 20, 30, or 40 mg/kg, respectively. No significant changes in TH or GFAP were seen at the 10 mg/kg MA dose. These results demonstrate that a single-dose of MA can be as effective as the widely used four-dose every 2 h regimen. Moreover, mortality can be ...Continue Reading

Mentioned in this Paper

Alpha-Neurotoxins
Glial Fibrillary Acidic Protein
Lentiform Nucleus Structure
Madrine
Biogenic Monoamines
Intropin
Fever
Tyrosine 3-Monooxygenase
Neurotoxicity Syndromes
Rats, Holtzman

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