title: Adolescent mice show anxiety- and aggressive-like behavior and the reduction of long-term potentiation in mossy fiber-CA3 synapses after neonatal maternal separation.
abstract: Exposure to maternal separation (MS) during early life is an identified risk factor for emotional disorders such as anxiety and depression later in life. This study investigated the effects of neonatal MS on the behavior and long-term potentiation (LTP) as well as basic synaptic transmission at hippocampal CA3-CA1 and mossy fiber (MF)-CA3 synapses in adolescent mice for 19days. When mice were adolescents, we measured depression, learning, memory, anxious and aggressive behavior using the forced swimming test (FST), Y-maze, Morris water maze (MWM), elevated plus maze (EPM), three consecutive days of the open field test, the social interaction test, the tube-dominance test and the resident-intruder test. The results showed that there was no difference in FST, Y-maze, and MWM performance. However, MS mice showed more anxiety-like behavior in the EPM test and aggressive-like behavior in the tube-dominance and resident-intruder tests. In addition, the magnitude of LTP and release probability in the MF-CA3 synapses was reduced in the MS group but not in the CA3-CA1 synapse. Our results indicate that early life stress due to MS may induce anxiety- and aggressive-like behavior during adolescence, and these effects are associated with synaptic plasticity at the hippocampal MF-CA3 synapses.
authors.affiliation: Department of Physiology and Biophysics, Eulji University Hospital School of Medicine, Eulji University, Daejeon, Republic of Korea.
authors.forename: S Y
authors.initials: SY
authors.lastname: Shin
authors.affiliation: Department of Physiology and Biophysics, Eulji University Hospital School of Medicine, Eulji University, Daejeon, Republic of Korea.
authors.forename: S H
authors.initials: SH
authors.lastname: Han
authors.affiliation: Department of Anatomy and Neuroscience, Eulji University Hospital School of Medicine, Eulji University, Daejeon, Republic of Korea.
authors.forename: R-S
authors.initials: RS
authors.lastname: Woo
authors.affiliation: Department of Neurology, Eulji University Hospital School of Medicine, Eulji University, Daejeon, Republic of Korea. Electronic address: mj@eulji.ac.kr.
authors.forename: S H
authors.initials: SH
authors.lastname: Jang
authors.affiliation: Department of Physiology and Biophysics, Eulji University Hospital School of Medicine, Eulji University, Daejeon, Republic of Korea. Electronic address: ssmin@eulji.ac.kr.
authors.forename: S S
authors.initials: SS
authors.lastname: Min
mesh_terms: D000374:Aggression / Q000523:psychology; D000818:Animals; D000831:Animals, Newborn; D001007:Anxiety / Q000209:etiology / Q000473:pathology* / Q000523:psychology; D001703:Biophysics; D001835:Body Weight / Q000502:physiology; D056654:CA3 Region, Hippocampal / Q000473:pathology*; D004195:Disease Models, Animal; D004558:Electric Stimulation; D005106:Exploratory Behavior / Q000502:physiology; D005260:Female; D066298:In Vitro Techniques; D007398:Interpersonal Relations; D017774:Long-Term Potentiation / Q000502:physiology*; D008297:Male; D008426:Maternal Deprivation; D018782:Maze Learning / Q000502:physiology; D051379:Mice; D019599:Mossy Fibers, Hippocampal / Q000503:physiopathology*; D018408:Patch-Clamp Techniques; D013550:Swimming / Q000523:psychology
keywords: MF-CA3; aggression; hippocampus; long-term potentiation (LTP); maternal separation; synaptic plasticity