title: Exposure to enriched environments during adolescence prevents abnormal behaviours associated with histone deacetylation in phencyclidine-treated mice.
abstract: Enriched environments (EEs) during development have been shown to influence adult behaviour. Environmental conditions during childhood may contribute to the onset and/or pathology of schizophrenia; however, it remains unclear whether EE might prevent the development of schizophrenia. Herein, we investigated the effects of EE during adolescence on phencyclidine (PCP)-induced abnormal behaviour, a proposed schizophrenic endophenotype. Male ICR mice (3 wk old) were exposed to an EE for 4 wk and then treated with PCP for 2 wk. The EE potentiated the acute PCP treatment-induced hyperlocomotion in the locomotor test and prevented chronic PCP treatment-induced impairments of social behaviour and recognition memory in the social interaction and novel object recognition tests. It also prevented the PCP-induced decrease of acetylated Lys9 in histone H3-positive cells and increase of the histone deacetylase (HDAC)5 level in the prefrontal cortex. To investigate whether the histone modification during adolescence might be critical for the effect of EE, 3-wk-old mice were first treated with sodium butyrate (SB; an HDAC inhibitor) for 4 wk and then treated with PCP for 2 wk. Chronic SB treatment during adolescence mimicked the effects of EE, including potentiation of hyperlocomotion induced by acute PCP treatment and prevention of social and cognitive impairments, decrease of acetylated Lys9 in histone H3-positive cells and increase of the HDAC5 level in the prefrontal cortex associated with chronic PCP treatment. Our results suggest that EEs prevent PCP-induced abnormal behaviour associated with histone deacetylation. EEs during childhood might prove to be a novel strategy for prophylaxis against schizophrenia.
authors.affiliation: Department of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Meijo University, Nagoya, Japan.
authors.forename: Takenao
authors.initials: T
authors.lastname: Koseki
authors.forename: Akihiro
authors.initials: A
authors.lastname: Mouri
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Mamiya
authors.forename: Yuki
authors.initials: Y
authors.lastname: Aoyama
authors.forename: Kazuya
authors.initials: K
authors.lastname: Toriumi
authors.forename: Shizuka
authors.initials: S
authors.lastname: Suzuki
authors.forename: Azusa
authors.initials: A
authors.lastname: Nakajima
authors.forename: Takuma
authors.initials: T
authors.lastname: Yamada
authors.forename: Taku
authors.initials: T
authors.lastname: Nagai
authors.forename: Toshitaka
authors.initials: T
authors.lastname: Nabeshima
mesh_terms: D000367:Age Factors; D000818:Animals; D004777:Environment; D006655:Histone Deacetylases / Q000378:metabolism*; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology; D010622:Phencyclidine / Q000633:toxicity*; D011595:Psychomotor Agitation / Q000201:enzymology* / Q000517:prevention & control* / Q000523:psychology; D012919:Social Behavior
chemical_list: D006655:Histone Deacetylases; D010622:Phencyclidine