Abstract
Adenosine A2A receptor (A2AR) is a G protein-coupled receptor enriched in the striatum for which an increased expression has been demonstrated in certain neurological diseases. Interestingly, previous in vitro studies demonstrated that A2AR expression levels are reduced after treatment with S-adenosyl-L-methionine (SAM), a methyl donor molecule involved in the methylation of important biological structures such as DNA, proteins, and lipids. However, the in vivo effects of SAM treatment on A2AR expression are still obscure. Here, we demonstrated that 2 weeks of SAM treatment produced a significant reduction in the rat striatal A2AR messenger RNA (mRNA) and protein content as well as A2AR-mediated signaling. Furthermore, when the content of 5-methylcytosine levels in the 5′UTR region of ADORA2A was analyzed, this was significantly increased in the striatum of SAM-treated animals; thus, an unambiguous correlation between SAM-mediated methylation and striatal A2AR expression could be established. Overall, we concluded that striatal A2AR functionality can be controlled by SAM treatment, an issue that might be relevant for the management of these neurological conditions that course with increased A2AR expression.
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Acknowledgments
This work was supported by the Ministerio de Ciencia e Innovación, Instituto de Salud Carlos III (grant CP08/00095 to MB), Ministerio de Economía y Competitividad (grants SAF2011-24779, Consolider-Ingenio CSD2008-00005 and PCIN-2013-019-C03-03 to FC, and BFU2011-23034 to MM), and La Fundació La Marató de TV3 (grants 090330 to MB, and 092331 to MM). Also supported by the Catalan Institution for Research and Advanced Studies (ICREA Academia-2010) is FC. FN and FC belong to the “Neuropharmacology and Pain” accredited research group (Generalitat de Catalunya, 2009 SGR 232). IVM is the recipient of an IDIBELL predoctoral fellowship.
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The authors declare no competing financial interests.
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Fabiana Nuñez and Sara Díaz-Sánchez contributed equally.
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Villar-Menéndez, I., Nuñez, F., Díaz-Sánchez, S. et al. Striatal adenosine A2A receptor expression is controlled by S-adenosyl-L-methionine-mediated methylation. Purinergic Signalling 10, 523–528 (2014). https://doi.org/10.1007/s11302-014-9417-4
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DOI: https://doi.org/10.1007/s11302-014-9417-4