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Epidemiological studies indicate that maternal influenza viral infection increases the risk for schizophrenia in the adult offspring. The serotonin and glutamate systems are suspected in the etiology of schizophrenia, as well as in the mechanism of action of antipsychotic drugs. The effects of hallucinogens, such as psilocybin and mescaline, require the serotonin 5-HT(2A) receptor, and induce schizophrenia-like psychosis in humans. In addition, metabotropic glutamate receptor mGlu(2/3) agonists show promise as a new treatment for schizophrenia. Here, we investigated the level of expression and behavioral function of 5-HT(2A) and mGlu(2) receptors in a mouse model of maternal influenza viral infection. We show that spontaneous locomotor activity is diminished by maternal infection with the mouse-adapted influenza A/WSN/33 (H1N1) virus. The behavioral responses to hallucinogens and glutamate antipsychotics are both affected by maternal exposure to influenza virus, with increased head-twitch response to hallucinogens and diminished antipsychotic-like effect of the glutamate agonist. In frontal cortex of mice born to influenza virus-infected mothers, the 5-HT(2A) receptor is upregulated and the mGlu(2) receptor is downregulated, an alteration that may be involved in the behavioral changes observed. Additionally, we find that the cortical 5-HT(2A) receptor-dependent signaling pathways are significantly altered in the offspring of infected mothers, showing higher c-fos, egr-1, and egr-2 expression in response to the hallucinogenic drug DOI. Identifying a biochemical alteration that parallels the behavioral changes observed in a mouse model of prenatal viral infection may facilitate targeting therapies for treatment and prevention of schizophrenia.

Maternal Influenza Viral Infection Causes Schizophrenia-Like Alterations of 5-HT2Aand mGlu2Receptors in the Adult Offspring

Maternal Influenza Viral Infection Causes Schizophrenia-Like Alterations of 5-HT_2Aand mGlu₂Receptors in the Adult Offspring