The neurotoxic effects of MDMA (Ecstasy) may depend heavily on how the body metabolizes the drug in the liver. Metabolism produces highly reactive compounds, including catechols, catechol thioethers, and quinones. Researchers used cyclic voltammetry to measure the electrochemical oxidation-reduction processes of chemically synthesized human MDMA metabolites. They then correlated the redox potentials of α-methyldopamine, N-methyl-α-methyldopamine, and 5-(glutathion-S-yl)-α-methyldopamine with their toxicity to rat cortical neurons. The data demonstrated that the lower oxidation potential of the catecholic thioether of α-MeDA correlated with its higher toxicity, supporting the use of voltammetry data to predict the toxicity of MDMA metabolites.
MDMA (ecstasy) disrupts mitochondria in brain and liver cells. In laboratory models, MDMA depletes ATP, inhibits mitochondrial complexes I and III, reduces mitochondrial membrane potential, and triggers mitochondrial permeability transition. It also causes release of cytochrome c, impairing mitochondrial trafficking and increasing fragmentation of axonal mitochondria. Animal studies show decreased complex I activity, lower ATP levels, and oxidative stress leading to mitochondrial DNA deletions and impaired protein synthesis. These mitochondrial abnormalities partly explain MDMA's neurotoxicity and hepatotoxicity, though concentrations used in some studies may not match human exposure levels.