A(2A) adenosine receptor deletion is protective in a mouse model of Tauopathy
2016
Mol Psychiatry
21:97-107
Authors: 
Laurent C
Burnouf S
Ferry B
Batalha VL
Coelho JE
Baqi Y
Malik E
Parrot S
Van der Jeugd A
Faivre E
Flaten V
Ledent C
D'Hooge R
Sergeant N
Hamdane M
Humez S
Muller CE
Lopes LV
Buee L
Blum D

Consumption of caffeine, a non-selective adenosine A(2A) receptor (A(2A)R) antagonist, reduces the risk of developing Alzheimer's disease (AD) in humans and mitigates both amyloid and Tau burden in transgenic mouse models. However, the impact of selective A(2A)R blockade on the progressive development of AD-related lesions and associated memory impairments has not been investigated. In the present study, we removed the gene encoding A(2A)R from THY-Tau22 mice and analysed the subsequent effects on both pathological (Tau phosphorylation and aggregation, neuro-inflammation) and functional impairments (spatial learning and memory, hippocampal plasticity, neurotransmitter profile). We found that deleting A(2A)Rs protect from Tau pathology-induced deficits in terms of spatial memory and hippocampal long-term depression. These effects were concomitant with a normalization of the hippocampal glutamate/gamma-amino butyric acid ratio, together with a global reduction in neuro-inflammatory markers and a decrease in Tau hyperphosphorylation. Additionally, oral therapy using a specific A(2A)R antagonist (MSX-3) significantly improved memory and reduced Tau hyperphosphorylation in THY-Tau22 mice. By showing that A(2A)R genetic or pharmacological blockade improves the pathological phenotype in a Tau transgenic mouse model, the present data highlight A(2A) receptors as important molecular targets to consider against AD and Tauopathies.