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- Title
Methamphetamine Blocks Adenosine A 2A Receptor Activation via Sigma 1 and Cannabinoid CB 1 Receptors.
- Authors
Casanovas, Mireia; Reyes-Resina, Irene; Lillo, Alejandro; Lillo, Jaume; López-Arnau, Raul; Camarasa, Jorge; Escubedo, Elena; Navarro, Gemma; Franco, Rafael; Svenningsson, Per
- Abstract
Methamphetamine is, worldwide, one of the most consumed drugs of abuse. One important side effect is neurodegeneration leading to a decrease in life expectancy. The aim of this paper was to check whether the drug affects one of the receptors involved in neurodegeneration/neuroprotection events, namely the adenosine A2A receptor (A2AR). First, we noticed that methamphetamine does not affect A2A functionality if the receptor is expressed in a heterologous system. However, A2AR becomes sensitive to the drug upon complexes formation with the cannabinoid CB1 receptor (CB1R) and the sigma 1 receptor (σ1R). Signaling via both adenosine A2AR and cannabinoid CB1R was affected by methamphetamine in cells co-expressing the two receptors. In striatal primary cultures, the A2AR–CB1R heteromer complex was detected and methamphetamine not only altered its expression but completely blocked the A2AR- and the CB1R-mediated activation of the mitogen activated protein kinase (MAPK) pathway. In conclusion, methamphetamine, with the participation of σ1R, alters the expression and function of two interacting receptors, A2AR, which is a therapeutic target for neuroprotection, and CB1R, which is the most abundant G protein-coupled receptor (GPCR) in the brain.
- Subjects
SIGMA-1 receptor; G protein coupled receptors; METHAMPHETAMINE; ADENOSINES; CANNABINOID receptors; PROTEIN kinases
- Publication
International Journal of Molecular Sciences, 2021, Vol 22, Issue 5, p2743
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms22052743