Related Experiment Video

Updated: Aug 7, 2026

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
06:23

Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation

Published on: March 9, 2018

MDMA-induced neurotoxicity: long-term effects on 5-HT biosynthesis and the influence of ambient temperature

Esther O'Shea1, Laura Orio, Isabel Escobedo

  • 1Departamento de Farmacologia, Facultad de Medicina, Universidad Complutense, Madrid 28040, Spain.

British Journal of Pharmacology
|June 14, 2006
PubMed

Insights

3,4-Methylenedioxymethamphetamine (MDMA) causes long-term damage to serotonin neurons in rats. However, measuring serotonin levels alone may overestimate neurotoxicity, as MDMA also inhibits serotonin synthesis.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Toxicology

Background:

  • 3,4-Methylenedioxymethamphetamine (MDMA) is known to affect serotonin (5-HT) levels.
  • Previous studies suggested MDMA causes 5-HT neurotoxicity, but this was debated due to MDMA's effect on tryptophan hydroxylase (TPH).
  • This study aimed to validate parameters used to assess MDMA neurotoxicity.

Purpose of the Study:

  • To evaluate the validity of 5-HT concentration, [3H]-paroxetine binding, and TPH activity as indicators of MDMA neurotoxicity.
  • To investigate the long-term effects of MDMA on serotoninergic neurons in rats.

Main Methods:

  • Male DA rats were administered MDMA (12.5 mg/kg) and observed for up to 32 weeks.
  • Measurements included 5-HT content, [3H]-paroxetine binding, in vivo TPH activity, and 5-HT turnover rate.
  • Experiments involved different housing temperatures (4°C vs. 22°C) to assess environmental influences.

Main Results:

  • MDMA induced long-term reductions in 5-HT content and [3H]-paroxetine binding in the cortex and hippocampus.
  • TPH activity was reduced up to 8 weeks but recovered by 32 weeks; striatal markers recovered earlier.
  • Reduced 5-HT concentration did not correlate with an altered 5-HT synthesis rate, and cold housing affected binding and TPH activity but not 5-HT concentration.

Conclusions:

  • MDMA causes persistent damage to serotoninergic neurons, but this damage does not lead to increased 5-HT synthesis in remaining terminals.
  • Tissue 5-HT concentration measurements may overestimate MDMA-induced neurotoxicity.
  • Environmental factors like temperature can influence the observed neurotoxic effects of MDMA.

More Related Videos

Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons15:05

Functional Evaluation of Biological Neurotoxins in Networked Cultures of Stem Cell-derived Central Nervous System Neurons

Published on: February 5, 2015

Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons10:36

Modeling Neuronal Death and Degeneration in Mouse Primary Cerebellar Granule Neurons

Published on: November 6, 2017

Related Concept Videos

Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
Long-term Depression01:03

Long-term Depression

Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over time, all...