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Effects of repeated doses of MDMA ("ecstasy") on cell-mediated immune response in humans
R Pacifici1, P Zuccaro, M Farré
1Clinical Biochemistry Department, Istituto Superiore di Sanità, Roma, Italy.
Abstract:
Cell-mediated immune response after the administration of two repeated doses of 100 mg 3,4-methylenedioxymethamphetamine (MDMA) at 4-hour and 24-hour intervals was evaluated in two randomised, double-blind and cross-over clinical trials conducted in healthy male MDMA consumers. MDMA produced a time-dependent decrease in the CD4/CD8 T-cell ratio due to a decrease in the number of CD4 T-helper cells, a decrease in the functional responsiveness of lymphocytes to mitogenic stimulation, and a simultaneous increase in natural killer cells. In case of two 100 mg MDMA doses given 4 hour apart, immune alterations produced by the first dose were strengthened by the second one. At 24 hours after treatment, statistically significant residual effects were observed for all the altered immune parameters after the administration of two MDMA doses if compared to single dose and placebo. In the second clinical trial, the second 100 mg MDMA dose given 24 hours after the first dose produced immunological changes significantly greater than those induced by the initial drug administration and which seemed to show a delayed onset. Significant residual effects were observed for all the immune parameters as late as 48 hours after the second dose. These results show that repeated administration of MDMA with both a short and a long time interval between doses extends the critical period following MDMA administration, already observed after a single dose, in which immunocompetence is severely compromised.
Insights
Repeated doses of 3,4-methylenedioxymethamphetamine (MDMA) significantly impair immune function, decreasing T-cells and natural killer cells. These immune alterations persist longer with repeated MDMA administration.
Area of Science:
- Immunology
- Pharmacology
- Clinical Trials
Background:
- 3,4-methylenedioxymethamphetamine (MDMA) is known to affect the immune system.
- Understanding the impact of repeated MDMA administration on cell-mediated immunity is crucial for public health.
- Previous studies indicate single doses of MDMA can compromise immunocompetence.
Purpose of the Study:
- To evaluate the cell-mediated immune response following repeated MDMA administration.
- To compare the immunological effects of MDMA given at short (4-hour) and long (24-hour) intervals.
- To determine the duration of immune alterations after repeated MDMA doses.
Main Methods:
- Two randomized, double-blind, cross-over clinical trials were conducted in healthy male MDMA consumers.
- Participants received two repeated doses of 100 mg MDMA at either 4-hour or 24-hour intervals.
- Immune parameters, including T-cell subsets (CD4, CD8), lymphocyte responsiveness, and natural killer cells, were assessed.
Main Results:
- MDMA caused a time-dependent decrease in the CD4/CD8 T-cell ratio, reduced T-helper cell counts, and impaired lymphocyte responsiveness.
- A simultaneous increase in natural killer cells was observed.
- Repeated MDMA doses, particularly at the 4-hour interval, strengthened immune alterations. Significant residual effects were noted up to 24 hours after the second dose (4-hour interval) and 48 hours (24-hour interval).
Conclusions:
- Repeated MDMA administration, regardless of the interval, significantly compromises immunocompetence.
- The duration of immune suppression is extended with repeated MDMA use compared to single doses.
- These findings highlight the prolonged critical period of compromised immunity following MDMA.