학술논문
Effect of a non-hydrolyzable analog of diadenosine polyphosphates on NMDA-mediated currents in isolated pyramidal neurons of the rat hippocampus
Document Type
Original Paper
Author
Source
Neurophysiology. May 2006 38(3):169-174
Subject
Language
English
ISSN
0090-2977
1573-9007
1573-9007
Abstract
Using a patch-clamp technique under voltage clamp conditions, we studied the effect of a non-hydrolyzable analog of diadenosine polyphosphates (AppCH2 ppAs) on chemoactivated transmembrane currents through NMDA channels (NMDA currents) in isolated pyramidal neurons of the rat hippocampal CA3 zone. In 55.7% of the cases, AppCH2 ppAs caused an increase in the peak amplitude of the currents induced by application of aspartate. In 39.5% of the cases, the agent exerted no effect, while in 4.8% these currents were suppressed. When studying the pharmacological effect of an increase in the amplitude of NMDA currents, we found that potentiation of these currents is mediated, first of all, by activation of P2 purinoceptors and is prevented by a blocker of tyrosine kinases, genistein. Receptor-channel NMDA complexes, due to their ability to be blocked by divalent cations, also contribute to the above effect of AppCH2 ppA. Based on the data obtained, we conclude that AppCH2 ppA influences NMDA receptors via activation of the P2 receptors and subsequent activation of tyrosine kinases; this leads to the modification of receptor-channel NMDA complexes and to the removal of their tonic blocking by zinc ions.