A novel dihydro-pyrazolo(3,4d)(1,2,4)triazolo(1,5a)pyrimidin-4-one (AJ23) is an antagonist at adenosine A(1) receptors and enhances consolidation of step-down avoidance.

HARVEY AL; YOUNG LC; KORNISUIK E; SNITCOFSKY M; COLETTIS N; BLANCO C; JERUSALINSKY D; JAMIESON AG; HARTLEY RC; STONE TW.

BEHAVIOURAL BRAIN RESEARCH

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2012 vol. 234 p. 184 - 191

0166-4328

Adenosine A1 receptor antagonists are of potential value in the treatment of cognitive dysfunction. We have developed compound AJ23 (7-methyl-1-phenyl-1,8-dihydro-pyrazolo-(3,4d)(1,2,4)-triazolo(1,5a)- pyrimidin-4-one) as a novel, non-xanthine based antagonist at A1 receptors. It has micromolar affinity at human A1 receptors with a 45-fold selectivity for A1 over A2A receptors and little affinity for many other receptors and transporters tested in a screening panel. AJ23 blocks A1 receptors in the rat hippocampus, increasing the baseline size of excitatory post-synaptic potentials and blocking the inhibitory effects of adenosine. When administered directly into the rodent hippocampus this compound improves consolidation in a step-down avoidance learning task. The results suggest that AJ23 or derivatives may represent possible leads for further chemical development towards a chemically novel group of antagonists at A1 receptors with potential value as cognitive enhancers.