Lukomskaya N Ya, Lavrent'eva V V, Starshinova L A, Zhabko E P, Gmiro V E, Magazanik L G
I. M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 M. Torez Prospekt, 194223 St. Petersburg, Russia.
Neurosci Behav Physiol. 2008 May;38(4):421-6. doi: 10.1007/s11055-008-0060-9.
Administration of the muscarinic cholinoreceptor agonist arecoline (6 mg/kg, s.c.) to mice induced long-lasting tremor. The ability of non-competitive antagonists of ionotropic glutamate receptors to suppress the onset of tremor was studied. These antagonists, i.e., adamantane and phenylcyclohexyl derivatives, selectively blocked NMDA-type receptor channels (monocations) or both NMDA-and AMPA-type channels (dications). Both types of blocker weakened arecoline tremor, though the dose-response relationships were different for mono-and dications. The effects of dications appeared only at low blocker doses (0.0001-0.01 micromol/kg) but gradually disappeared on dose elevation. These data lead to the conclusion that the mechanism of pathogenesis of arecoline tremor predominantly involves NMDA-type receptors. Moderate blockade of AMPA-type receptors could potentiate the preventive effect of mixed-action antagonists (anti-NMDA+anti-AMPA), though predominance of blocking action against AMPA-type receptors prevented this effect.
