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Serotonin 5-HT7 Receptor Blockade Reverses Behavioral Abnormalities in PACAP-Deficient Mice and Receptor Activation Promotes Neurite Extension in Primary Embryonic Hippocampal Neurons

Therapeutic Implications for Psychiatric Disorders

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Abstract

The serotonin 5-HT7 receptor has been linked to various psychiatric disorders, including schizophrenia, anxiety and depression, and is antagonized by antipsychotics such as risperidone, clozapine and lurasidone. In this study, we examined whether inhibiting the 5-HT7 receptor could reverse behavioral abnormalities in mice lacking pituitary adenylate cyclase-activating polypeptide (PACAP), an experimental mouse model for psychiatric disorders such as schizophrenia. The selective 5-HT7 antagonist SB-269970 effectively suppressed abnormal jumping behavior in PACAP-deficient mice. SB-269970 tended to alleviate the higher immobility in the forced swim test in PACAP-deficient mice, although SB-269970 reduced the immobility also in wild-type mice. In addition, we found that mutant mice had impaired performance in the Y-maze test, which was reversed by SB-269970. In the mutant mouse brain, 5-HT7 protein expression did not differ from wild-type mice. In primary embryonic hippocampal neurons, the 5-HT7 agonist AS19 increased neurite length and number. Furthermore, SB-269970 significantly inhibited the increase in neurite extension mediated by the 5-HT1A/7 agonist 8-OH-DPAT. These results indicate that 5-HT7 receptor blockade ameliorates psychomotor and cognitive deficits in PACAP-deficient mice, providing additional evidence that the 5-HT7 receptor is a rational target for the treatment of psychiatric disorders.

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Authors and Affiliations

  1. Laboratory of Molecular Neuropharmacology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Minako Tajiri, Atsuko Hayata-Takano, Kaoru Seiriki, Katsuya Ogata, Keisuke Hazama, Norihito Shintani & Hitoshi Hashimoto

  2. Department of Experimental Disease Model, Center for Child Mental Development, United Graduate School of Child Development, Osaka University, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Atsuko Hayata-Takano & Hitoshi Hashimoto

  3. School of Pharmacy, Hyogo University of Health Sciences, 1-3-6 Minatojima, Chuo-ku, Kobe, Hyogo, 650-8530, Japan

    Akemichi Baba

Authors
  1. Minako Tajiri
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  2. Atsuko Hayata-Takano
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  3. Kaoru Seiriki
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  4. Katsuya Ogata
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  5. Keisuke Hazama
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  6. Norihito Shintani
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  7. Akemichi Baba
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  8. Hitoshi Hashimoto
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Correspondence to Hitoshi Hashimoto.

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M. Tajiri and Hayata-Takano equally contributed to this work.

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Tajiri, M., Hayata-Takano, A., Seiriki, K. et al. Serotonin 5-HT7 Receptor Blockade Reverses Behavioral Abnormalities in PACAP-Deficient Mice and Receptor Activation Promotes Neurite Extension in Primary Embryonic Hippocampal Neurons. J Mol Neurosci 48, 473–481 (2012). https://doi.org/10.1007/s12031-012-9861-y

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  • DOI: https://doi.org/10.1007/s12031-012-9861-y

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