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Here's a summary of research that I've read about MDMA and Neurotoxicity. I am still going through some 2004 and the 2005 articles so my summary is not up to date.
Neurotoxicity of MDMA
The heated debate regarding the classification of Ecstasy as a neurotoxin continues as a result of limitations in research methodology (Cole, Bailey, Sumnall, Wagstaff, & King, 2002; Green, Mechan, Elliott, O'Shea, & Colado, 2003; Murray, 2001). Alarmingly, MDMA has been found to produce dose-dependent hyperthermia in rodents, primates, and humans that is potentially fatal (Kalant, 2001; Mechan, O'Seah, Colado, & Green, 2001). Studies of MDMA have also detailed serotonin neurodegeneration that lasts for months in rats and years in primates (Malberg, & Seiden, 1998; Ricaurte et al., 1987). Furthermore, research of MDMA administration in mice has found evidence of a selective long-term loss of dopamine in nerve endings (Stone, Merchant, Hanson, & Gibb, 1987). However, some argue that these studies are not representative of human consumption, particularly of recreational users of MDMA (Cole et al., 2002). Notably, Ricaurte, Yuan, Hatzidimitrious, Cord, and McCann (2002) recently retracted a study in which they reported dopamine neurotoxicity in primates injected repeatedly with doses of MDMA thought to mimic those often taken by ecstasy users at rave parties. As reported by the journal, Science, the labels on the drugs supplied to the researchers were incorrect; the animals were given methamphetamine rather than MDMA (Ricaurte, Yuan, Cord, & McCann, 2003).
Human studies of MDMA use are also problematic. Potential confounds may result from using subjective reports of drug use, variability in MDMA composition and simultaneous use of other drugs (Cole et al., 2002; McCann, Ricaurte, & Molliver, 2001; Rivas-Vazquez, & Delgado, 2002). Several studies have examined memory deficits in recreational users of ecstasy (Morgan, 1999; Parrott, 2000; Parrott, Buchanan, Schooley, Heffernan, Ling, & Rodgers, 2002; Taffe, Davis, Yuan, Schroeder, Hatzidimitrious, Parsons, et al., 2002; Thomasisus, Petersen, Buchert, Andresen, Zapletalova, Wartberg et al., 2003; Verkes, Gijsman, Pieters, Schoemaker, de Visser, & Kuijpers, 2001; Zakzanis, & Young, (2001). However, to date, researchers have yet to conduct a study in which the amount of MDMA or other concomitant substances were quantified (Cole et al., 2002; Green et al., 2003).
Here are a bunch of the Ricaurte articles. I have a few choice words that I will refrain from saying
Ricaurte, G., & McCann, U. D. (2001). Assessing long-term effects of MDMA (Ecstasy). The Lancet, 358(9296), 1831-1832.
Ricaurte, G. A., Forno, L. S., Wilson, M. A., DeLanney, L. E., Irwin, I., & Molliver, M. E. (1988). (+/-)-3, 4-methylenedioxymethamphetamine selectively damages central serotonergic neurons in nonhuman primates. Journal of the American Medical Association, 260(51-55).
Ricaurte, G. A., Hatzidimitrious, G., Cord, B. J., & McCann, U. D. (2002). Severe dopaminergic neurotoxicity in primates after common recreational doses regimen of MDMA ("Ecstasy"). Science, 297(2260-2263).
Ricaurte, G. A., Irwin, I., Forno, L. S., DeLanney, L. E., E., L., & Langston, J. W. (1987). Aging and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced degeneration of dopaminergic neurons in the substantia nigra. Brain Research, 403(1), 43-51.
Ricaurte, G. A., Yuan, J., Hatzidimitrious, G., Cord, B. J., & McCann, U. D. (2003). Retraction. Science, 301(5639), 1479.
Thomasius, R., Petersen, K., Buchert, R., Andresen, B., Zapletalova, P., Wartberg, L., Nebeling, B., & Schmoldt, A. (2003). Mood, cognition and serotonin transporter availability in current and former ecstasy (MDMA) users. Psychopharmacology, 167, 85-96.
Rivas-Vazquez, F., & Delgado, L. (2002). Clinical and toxic effects of MDMA ("Ecstasy"). Professional Psychology: Research and Practice, 33(4), 422-425.
Schifano, F. (2000). Potential Human Neurotoxicity of MDMA ("Ecstasy"): Subjective self-reports, evidence from an Italian drug addiction centre and clinical case studies. Neuropsychobiology, 42(25-33). (So no will say I'm biased and only post the American research) =D
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Last edited by UMD Gradstudent on Jan-15-2006 at 23:40
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