Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 359, Issue -, Pages 828-835Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbr.2018.07.020
Keywords
5-Methoxy-a-methyltryptamine; Head-twitch response; Serotonin receptor 2a; Conditioned place preference; Self-administration
Categories
Funding
- Ministry of Food and Drug Safety (MFDS) of Korea [14182MFDS979]
- National Research Foundation of Korea [NRF-2017R1D1A1A02018695]
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5-Methoxy-alpha-methyltryptamine (5-MeO-AMT) is a tryptamine derivative that is used recreationally because of its reported hallucinogenic and mood elevating effects. Studies suggest that the psychopharmacological effects of tryptamines involve serotonin receptor 2a (5-HTR2a) activation in the brain. The head-twitch response (HTR) is widely used as a behavioral correlate for assessing 5-HTR2a agonist activity of a drug. Thus, we investigated whether 5-MeO-AMT induces HTR in mice and explored its mechanism of action. 5-MeO-AMT (0.3, 1, 3, 10 mg/kg) was administered once a day for 7 days, and the HTR was measured after 1 day (acute) and 7 days (repeated) of administration. Another cohort of mice was treated with 5-HTR2a antagonist ketanserin (KS) before 5-MeO-AMT administration. We measured 5-HTR2a and 5-HTR2c mRNA levels in the prefrontal cortex of the mice treated acutely or repeatedly with 5-MeO-AMT. We performed western blotting to determine the effects of the drug on the expression of G protein (G(q/11)), protein kinase C gamma (PKC-gamma), and extracellular signal-regulated kinases 1/2 (ERK1/2), in addition to PKC-gamma and ERK1/2 phosphorylation. Additionally, we evaluated potential rewarding and reinforcing effects of 5-MeO-AMT using locomotor sensitization, conditioned place preference (CPP), and self-administration (SA) paradigms. Acute 5-MeO-AMT administration elicited the HTR, while repeated administration resulted in tolerance. KS blocked the 5-MeO-AMT-induced HTR. 5-MeO-AMT increased 5-HTR2a mRNA levels and induced PKC-gamma phosphorylation in the prefrontal cortex. 5-MeO-AMT did not induce locomotor sensitization, CPP, or SA. This study shows that 5-MeO-AMT induces HTR through 5-HTR2a activation in the prefrontal cortex, and may have low potential for abuse.
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