title: Enhancement of GluN2B Subunit-Containing NMDA Receptor Underlies Serotonergic Regulation of Long-Term Potentiation after Critical Period in the Rat Visual Cortex.
abstract: Serotonin [5-hydroxytryptamine (5-HT)] regulates synaptic plasticity in the visual cortex. Although the effects of 5-HT on plasticity showed huge diversity depending on the ages of animals and species, it has been unclear how 5-HT can show such diverse effects. In the rat visual cortex, 5-HT suppressed long-term potentiation (LTP) at 5 weeks but enhanced LTP at 8 weeks. We speculated that this difference may originate from differential regulation of neurotransmission by 5-HT between the age groups. Thus, we investigated the effects of 5-HT on apha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR)-, γ-aminobutyric acid receptor type A (GABAAR)-, and N-methyl-D-aspartic acid receptor (NMDAR)-mediated neurotransmissions and their involvement in the differential regulation of plasticity between 5 and 8 weeks. AMPAR-mediated currents were not affected by 5-HT at both 5 and 8 weeks. GABAAR-mediated currents were enhanced by 5-HT at both age groups. However, 5-HT enhanced NMDAR-mediated currents only at 8 weeks. The enhancement of NMDAR-mediated currents appeared to be mediated by the enhanced function of GluN2B subunit-containing NMDAR. The enhanced GABAAR- and NMDAR-mediated neurotransmissions were responsible for the suppression of LTP at 5 weeks and the facilitation of LTP at 8 weeks, respectively. These results indicate that the effects of 5-HT on neurotransmission change with development, and the changes may underlie the differential regulation of synaptic plasticity between different age groups. Thus, the developmental changes in 5-HT function should be carefully considered while investigating the 5-HT-mediated metaplastic control of the cortical network.
authors.affiliation: Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Kayoung
authors.initials: K
authors.lastname: Joo
authors.affiliation: Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea. ; Catholic Neuroscience Institute, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Duck-Joo
authors.initials: DJ
authors.lastname: Rhie
authors.affiliation: Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea. ; Catholic Neuroscience Institute, The Catholic University of Korea, Seoul 06591, Korea.
authors.forename: Hyun-Jong
authors.initials: HJ
authors.lastname: Jang
keywords: 5-HT; AMPA receptor; GABAA receptor; Metaplasticity; Serotonin