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- Title
Serotonin Attenuates Feedback Excitation onto O-LM Interneurons.
- Authors
Böhm, Claudia; Pangalos, Maria; Schmitz, Dietmar; Winterer, Jochen
- Abstract
The serotonergic system is a subcortical neuromodulatory center that controls cortical information processing in a statedependent manner. In the hippocampus, serotonin (5-HT) is released by ascending serotonergic fibers from the midbrain raphe nuclei, thereby mediating numerous modulatory functions on various neuronal subtypes. Here, we focus on the neuromodulatory effects of 5-HT on GABAergic inhibitory oriens lacunosum-moleculare (O-LM) cells in the hippocampal area CA1 of the rat. These interneurons are thought to receive primarily local excitatory input and are, via their axonal projections to stratum lacunosum-moleculare, ideally suited to control entorhinal cortex input. We show that 5-HT reduces excitatory glutamatergic transmission onto O-LM interneurons. By means of paired recordings from synaptically connected CA1 pyramidal cells and O-LM interneuronswe reveal that this synapse is modulated by 5-HT. Furthermore,we demonstrate that the reduction of glutamatergic transmission by serotonin is likely to be mediated via a decrease of calcium influx into presynaptic terminals of CA1 pyramidal cells. This modulation of excitatory synaptic transmission onto O-LM interneurons by 5-HT might be a mechanism to vary the activation of O-LM interneurons during ongoing network activity and serve as a brain statedependent switch gating the efficiency of entorhinal cortex input to CA1 pyramidal neurons.
- Publication
Cerebral Cortex, 2015, Vol 25, Issue 11, p4572
- ISSN
1047-3211
- Publication type
Article
- DOI
10.1093/cercor/bhv098