期刊
NEUROPHARMACOLOGY
卷 47, 期 3, 页码 381-389出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropharm.2004.04.010
关键词
rat; hippocampus.; carbachol; DHPG; muscarinic acetylcholine receptor; metabotropic glutamate receptor
资金
- NINDS NIH HHS [NS30549] Funding Source: Medline
The aim of this study was to compare and contrast the properties of gamma oscillations induced by activation of muscarinic acetylcholine or metabotropic glutamate receptors in the CA3 region of rat hippocampal slices. Both carbachol and the group I metabotropic glutamate receptor agonist, (RS)-3,5-dihydroxyphenylglycine (DHPG), induced network oscillations in the gamma-frequency range (30-100 Hz). The M1 muscarinic receptor antagonist, pirenzepine, blocked carbachol-, but enhanced DHPG-induced oscillations, whereas LY 341495, an antagonist at metabotropic glutamate receptors, abolished DHPG-, but left carbachol-induced oscillations unchanged. There were significant differences in the peak frequency, maximal power, and spectral Width of the two oscillations. Pharmacological experiments showed that both types of oscillation depend on fast excitatory and inhibitory synaptic transmission. Interestingly, activation of neurokinin-1 receptors by substance P fragment or enhancement of inhibitory synaptic currents by the benzodiazepine ligand, zolpidem, boosted DHPG-, but reduced the power of carbachol-induced oscillations. These results suggest that, although carbachol and DHPG might activate similar conductances in individual pyramidal cells, the oscillations they induce in slices involve different network mechanisms, most likely by recruiting distinct types of GABAergic interneuron. (C) 2004 Elsevier Ltd. All rights reserved.
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