1<html> 2<head> 3 4<title>Tryptophan hydroxylase after taking MDMA</title>
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4</head><body bgcolor="#ffffff" text="#000000" vlink="#293A8B" 5link="#8897DB" alink="#cc0000"> 6<font face="Verdana", "Arial", "Helvetica" font size=-1> 7<blockquote> <blockquote> 8<h3><center> 9<big> 10 11In vitro reactivation of rat cortical tryptophan hydroxylase following in vivo inactivation by methylenedioxymethamphetamine</big> <br> 12<small>by<br> 13Stone DM, Hanson GR, Gibb JW.<br> 14 15Department of Pharmacology and Toxicology, <br>University of Utah, Salt Lake City 84112. 16 17<br> 18 19 <I>J Neurochem</I> 1989 Aug;53(2):572-81</small><br><br> 20ABSTRACT</center></h3><blockquote> 21<big><big>T</big></big>he activity of tryptophan hydroxylase (EC 1.14.16.4) from rat brain was significantly decreased 1 h following a single systemic injection of 3,4-methylenedioxymethamphetamine (MDMA) when assessed ex vivo by radioenzymatic assay or in vivo by the quantitation of 5-hydroxytryptophan accumulation following central L-aromatic amino acid decarboxylase inhibition. Recovery of enzymatic activity in vivo, which occurred within 24 h of low-dose MDMA treatment, appeared not to involve synthesis of new enzyme protein, because the return of enzymatic activity was not prevented by prior cycloheximide. Acutely MDMA-depressed cortical tryptophan hydroxylase activity could be completely restored in vitro by a prolonged (20-24 h) anaerobic incubation in the presence of dithiothreitol and Fe2+ at 25 degrees C; partial reconstitution occurred when 2-mercapto-ethanol was substituted for dithiothreitol. Cortical tryptophan hydroxylase acutely inactivated by methamphetamine or p-chloroamphetamine could be similarly reactivated. MDMA-inactivated cortical tryptophan hydroxylase derived from rats killed later than 3 days after drug treatment could not be significantly reactivated under the conditions described above, indicating the development of irreversible enzymatic damage. Kinetic analysis of enzyme reactivation revealed an approximate doubling of enzyme Vmax with no change in enzyme affinity for either substrate, tryptophan, or pterin cofactor. These studies suggest that MDMA and its congeners inactivate central tryptophan hydroxylase by inducing oxidation of key enzyme sulfhydryl groups. The reactivation capacity of drug-inactivated enzyme at various times after MDMA treatment may provide a means of assessing the development of MDMA-induced neurotoxicity. 22<p> 23</blockquote><b> 24 25 26 27<a href=../l-tryptophan/index.html>L-tryptophan</a><br> 28<a href=../mdma/controversies.html>Controversies</a><br> 29 30<a href=../mdmafluox.html>Protect and survive</a><br> 31<a href=../mdma/immune.html>MDMA and immunity</a><br> 32<a href=index.html>Tryptophan hydroxylase</a> 33<p> 34<p> 35<strong><center> 36 37<br> 38 39<center> 40<a href=../refs/index.html>Refs</a><br></b> 41</strong>and further reading<P><b><b> 42<a href=../index.html>HOME</a><br> 43<a href="https://www.hedweb.com/confile.htm">HedWeb</a><br> 44 45<a href="https://www.nootropic.com/">Nootropics</A><BR> 46<a href="https://www.cocaine.wiki/">cocaine.wiki</a><br> 47 48<a href="https://www.opioids.wiki/">Future Opioids</a><br> 49<a href="https://www.bltc.com/">BLTC Research</a><br> 50 51<a href="https://www.mdma.net/">MDMA/Ecstasy</A><BR> 52<a href="https://www.superhappiness.com/">Superhapiness?</A><br> 53<a href="https://www.general-anaesthesia.com/">Utopian Surgery?</A><BR> 54<a href="https://www.abolitionist.com/">The Abolitionist Project</A><BR> 55 56<a href="https://www.hedweb.com/hedab.htm">The Hedonistic Imperative</a><br> 57<a href="https://www.reproductive-revolution.com/">The Reproductive Revolution</A><BR> 58<a href="https://www.huxley.net/">Critique of Huxley's <I>Brave New World</I></A><BR><p><strong> 59<a href="https://www.biopsychiatry.com/"><img src=../swan.jpg width=100 height=92 border=0 alt="The Good Drug Guide"></a><br> 60 61<a href="https://www.biopsychiatry.com/">The Good Drug Guide</a></b><br></strong></b> The Responsible Parent's Guide <br>To Healthy Mood Boosters For All The Family<br> 62</center></blockquote></blockquote></font> 63 64 65
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