Get access

Adenosine A2A receptor antagonists exert motor and neuroprotective effects by distinct cellular mechanisms

Authors


Abstract

Objective

To investigate whether the motor and neuroprotective effects of adenosine A2A receptor (A2AR) antagonists are mediated by distinct cell types in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) model of Parkinson's disease.

Methods

We used the forebrain A2AR knock-out mice coupled with flow cytometric analyses and intracerebroventricular injection to determine the contribution of A2ARs in forebrain neurons and glial cells to A2AR antagonist-mediated motor and neuroprotective effects.

Results

The selective deletion of A2ARs in forebrain neurons abolished the motor stimulant effects of the A2AR antagonist KW-6002 but did not affect acute MPTP neurotoxicity. Intracerebroventricular administration of KW-6002 into forebrain A2AR knock-out mice reinstated protection against acute MPTP-induced dopaminergic neurotoxicity and attenuated MPTP-induced striatal microglial and astroglial activation.

Interpretation

A2AR activity in forebrain neurons is critical to the control of motor activity, whereas brain cells other than forebrain neurons (likely glial cells) are important components for protection against acute MPTP toxicity. Ann Neurol 2008

Ancillary