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Journals The FASEB Journal Volume 24 Issue 2

The antagonistic interaction between adenosine and dopamine receptors could have important pathophysiological and therapeutic implications in Parkinson’s disease (PD). The primary aim of this study was to investigate the expression, affinity, and density of A 1 , A 2A , A 2B , and A 3 adenosine receptors (ARs) and D 2 dopamine receptors (D 2 Rs) in PD. An increase in A 2A AR density in putamen was found. The presence and functionality of ARs in human lymphocyte and neutrophil membranes from patients with PD revealed a specific A 2A AR alteration compared with healthy subjects. A statistically significant linear correlation among the A 2A AR density, functionality, or tumor necrosis factor-α (TNF-α) levels and Unified Parkinson’s Disease Rating Scale (UPDRS) motor score was reported. Adenosine concentration and TNF-α levels were increased in plasma of patients with PD. In rat adrenal pheochromocytoma (PC12) cells, a widely useful model, adenosine antagonists decreased dopamine uptake, and an opposite effect was mediated by A 2A agonists. This is the first report showing the presence of an A 2A AR alteration in putamen in PD that mirrors a similar up-regulation in human peripheral blood cells. Moreover, the correlation found between A 2A AR density or A 2A agonist potency and UPDRS motor score highlights the central role of A 2A ARs in the pharmacological treatment of PD.—Varani, K., Vincenzi, F., Tosi, A., Gessi, S., Casetta, I., Granieri, G., Fazio, P., Leung, E., MacLennan, S., Granieri, E., Borea, P. A. A 2A adenosine receptor overexpression and functionality, as well as TNF-α levels, correlate with motor symptoms in Parkinson’s disease.

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A2A adenosine receptor overexpression and functionality, as well as TNF-α levels, correlate with motor symptoms in Parkinson’s disease

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