Translated from our German original by AI. The German text was researched, written, and edited by the Psychedelia Foundation team and remains the authoritative version.
The compound rapamycin can prevent both the development and the later expression of a behavioral sensitization caused by the synthetic cathinone MDPV in mice. That is the finding of a recent study in the journal Forensic Toxicology, which examined the influence of the mTOR signaling pathway on early addiction processes.
3,4-Methylenedioxypyrovalerone (MDPV) is a potent psychostimulant with a high potential for dependence. After repeated administration it triggers what is known as locomotor sensitization in animals, an increase in movement activity when the drug is given again. In research, the phenomenon serves as an animal model for neuroadaptive changes in the early phase of an emerging addiction.
To test the role of the enzyme mTOR (mammalian target of rapamycin) in these processes, the researchers treated C57BL/6JRj mice with the mTOR inhibitor rapamycin at different stages of the experiment:
- Induction phase (days 1 to 7): giving rapamycin at the same time during the first seven days prevented the increase in horizontal and vertical movement activity on day 7 compared with the first day. The development of sensitization was thus blocked.
- Expression phase (withdrawal): when the animals received rapamycin only during the last five days of a 13-day drug-free phase, the heightened movement response likewise failed to appear when MDPV was given again on day 21. The triggering (the expression) of sensitization was therefore suppressed.
The results show that the neuroadaptive processes underlying the behavior depend on the mTOR signaling pathway. This opens up approaches for further research on mTOR inhibitors in addiction medicine.
A direct conclusion about the treatment of human addiction is not yet possible, however: the study design captured only a specific movement model in mice, not complex clinical features such as craving, compulsive use or relapse behavior.
