Erowid
 
 
Plants - Drugs Mind - Spirit Freedom - Law Arts - Culture Library  
Erowid References Database
Johnson M, Hanson GR, Gibb JW. 
“Effect of MK-801 on the decrease in tryptophan hydroxylase induced by methamphetamine and its methylenedioxy analog”. 
Eur J Pharmacol. 1989;165(2-3):315-8.
Abstract
The role of N-methyl-D-aspartate (NMDA) receptors in the decrease in neostriatal tryptophan hydroxylase (TPH) activity induced by repeated high doses of methamphetamine or 3,4-methylenedioxymethamphetamine (MDMA) was evaluated. Rats received 4 injections of methamphetamine (15 mg/kg) or MDMA (10 mg/kg) at 6 h intervals, and were killed 18-20 h after the last administration. These treatments with methamphetamine or MDMA reduced neostriatal TPH activity to 26 and 34% of control, respectively. Coadministration of MK-801 (2.5 mg/kg) significantly attenuated the methamphetamine-induced decrease in TPH activity (66% of control), but did not alter the effect of MDMA. This study suggests that excitatory amino acids may participate in the methamphetamine-induced decline in central TPH activity, and that the mechanism by which MDMA and methamphetamine decreases TPH activity may differ.
Comments and Responses to this Article
#
Submit Comment
[ Cite HTML ]