title: Serotonin modulates the excitatory synaptic transmission in the dentate granule cells.
abstract: Serotonergic fibers from the raphe nuclei project to the hippocampal formation, the activity of which is known to modulate the inhibitory interneurons in the dentate gyrus. On the other hand, serotonergic modulation of the excitatory synapses in the dentate gyrus is not well examined. In the present study, we examined the effects of 5-HT on the excitatory postsynaptic potentials (EPSPs) in the dentate granule cells evoked by the selective stimulation of the lateral perforant path (LPP), the medial perforant path (MPP), or the mossy cell fibers (MCF). 5-HT depressed the amplitude of unitary EPSPs (uEPSPs) evoked by the stimulation of LPP or MPP, whereas uEPSPs evoked by MCF stimulation were little affected. The effect was partly explained by the decrease of the resting membrane resistance following the activation of 5-HT1A receptors, which was confirmed by computer simulations. We also found that the probability of evoking uEPSP by LPP stimulation but not MPP or MCF stimulation was reduced by 5-HT and that the paired-pulse ratio of LPP-evoked EPSP but not that of MPP- or MCF-evoked ones was increased by 5-HT. These effects were blocked by 5-HT2 antagonist, suggesting that the transmitter release in the LPP-granule cell synapse is inhibited by the activation of 5-HT2 receptors. The present results suggest that 5-HT can modulate the EPSPs in the dentate granule cells by at least two distinct mechanisms.
authors.affiliation: Laboratory of Neurobiology, Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan; and.
authors.forename: Kanako
authors.initials: K
authors.lastname: Nozaki
authors.affiliation: Department of Neurophysiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Kasumi, Naka-ku, Hiroshima, Japan.
authors.forename: Reika
authors.initials: R
authors.lastname: Kubo
authors.affiliation: Laboratory of Neurobiology, Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Japan; and yasfuru@hiroshima-u.ac.jp.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Furukawa
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D003198:Computer Simulation; D018891:Dentate Gyrus / Q000166:cytology*; D004558:Electric Stimulation; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects*; D005260:Female; D018756:GABA Antagonists / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D008959:Models, Neurological; D019599:Mossy Fibers, Hippocampal / Q000502:physiology; D009474:Neurons / Q000187:drug effects* / Q000502:physiology; D019580:Perforant Pathway / Q000502:physiology; D010852:Picrotoxin; D010879:Piperazines / Q000494:pharmacology; D011725:Pyridines / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D012701:Serotonin / Q000494:pharmacology*; D012702:Serotonin Antagonists / Q000494:pharmacology; D018709:Statistics, Nonparametric
chemical_list: D018756:GABA Antagonists; D010852:Picrotoxin; D010879:Piperazines; D011725:Pyridines; D012701:Serotonin; D012702:Serotonin Antagonists; C090413:N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide
keywords: EPSP; dentate gyrus; granule cells; serotonin