Neonatal polyI:C treatment in mice results in schizophrenia-like behavioral and neurochemical abnormalities in adulthood

Daisuke Ibi, Taku Nagai, Yuko Kitahara, Hiroyuki Mizoguchi, Hiroyuki Koike, Anna Shiraki, Kazuhiro Takuma, Hiroyuki Kamei, Yukihiro Noda, Atsumi Nitta, Toshitaka Nabeshima, Yukio Yoneda, Kiyofumi Yamada

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)


It has been reported that viral infection in the first and second trimesters of pregnancy in humans increases the risk of subsequently developing schizophrenia. To develop a mouse model of immune activation during the early postnatal period, neonatal ICR mice were repeatedly injected with polyriboinosinic-polyribocytidilic acid (polyI:C; an inducer of strong innate immune responses) for 5 days (postnatal day 2-6) which may correspond, in terms of brain development, to the early second trimester in human. Cognitive and emotional behavior as well as the extracellular level of glutamate in the hippocampus were analyzed at the age of 10-12 weeks old. PolyI:C-treated mice showed anxiety-like behavior, impairment of object recognition memory and social behavior, and sensorimotor gating deficits, as compared to the saline-treated control group. Depolarization-evoked glutamate release in the hippocampus was impaired in polyI:C-treated mice compared to saline-treated control mice. Furthermore, to investigate the effect of neonatal immune activation on the expression levels of schizophrenia-related genes, we analyzed mRNA levels in the hippocampus 2 and 24 h after polyI:C treatment. No significant differences or only transient and marginal changes were observed between polyI:C-treated and saline-treated control mice in the expression levels of schizophrenia-related genes in the hippocampus.

Original languageEnglish
Pages (from-to)297-305
Number of pages9
JournalNeuroscience Research
Issue number3
Publication statusPublished - 07-2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Neuroscience


Dive into the research topics of 'Neonatal polyI:C treatment in mice results in schizophrenia-like behavioral and neurochemical abnormalities in adulthood'. Together they form a unique fingerprint.

Cite this