A functional role for adenosine A3 receptors: modulation of synaptic plasticity in the rat hippocampus.
Adenosine modulates hippocampal synaptic plasticity, namely long-term potentiation (LTP) and long-term depression (LTD), through activation of A1 and A2A receptors. We now report a novel role for the recently described adenosine A3 receptor in the regulation of synaptic plasticity in the CA1 area of hippocampal slices. Activation of adenosine A3 receptors by (1-[2-chloro-6-[[(3-iodophenyl)methyl]amino]-9H-purin-p-yl]-1-deoxy-N-methyl-beta-D-ribofuranuronamide (Cl-IBMECA) (100 nM) increased the magnitude of theta-burst induced LTP (from 1.2+/-0.6% in the control solution to 25.5+/-0.8% in the presence of Cl-IBMECA) and attenuated LTD (from 30.0+/-5.5% decrease in the control solution to 13.6+/-6.6% decrease in the presence of Cl-IBMECA). The selective adenosine A3 receptor antagonist, MRS 1191 (5-10 microM), prevented the effects of Cl-IBMECA. These findings indicate a functional role for adenosine A3 receptors in the modulation of synaptic plasticity.
Costenla
A R
AR
Laboratory of Neurosciences, Faculty of Medicine of Lisbon, Avenue Professor Egas Moniz, 1649-028, Lisbon, Portugal.
Lopes
L V
LV
de Mendonça
A
A
Ribeiro
J A
JA
D000241:Adenosine / Q000031:analogs & derivatives; D000818:Animals; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology*; D006624:Hippocampus / Q000187:drug effects / Q000502:physiology*; D017774:Long-Term Potentiation / Q000187:drug effects / Q000502:physiology*; D008297:Male; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology*; D058906:Purinergic P1 Receptor Agonists; D051381:Rats; D017208:Rats, Wistar; D043684:Receptor, Adenosine A3; D018047:Receptors, Purinergic P1 / Q000502:physiology*; D014970:Xanthines / Q000494:pharmacology
D058906:Purinergic P1 Receptor Agonists; D043684:Receptor, Adenosine A3; D018047:Receptors, Purinergic P1; D014970:Xanthines; C051360:1,3-dipropyl-8-cyclopentylxanthine; D000241:Adenosine; C090034:2-chloro-N(6)-(3-iodobenzyl)adenosine-5'-N-methyluronamide