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2021 Fiscal Year Final Research Report

Serotonin 5-HT2A receptors imaging in a a rat model of schizophrenia

Research Project

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Project/Area Number 19K08052
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52030:Psychiatry-related
Research InstitutionFukushima Medical University

Principal Investigator

Jodo Eiichi  福島県立医科大学, 医学部, 准教授 (50211975)

Co-Investigator(Kenkyū-buntansha) 鈴木 喜明  福島県立医科大学, 医学部, 博士研究員 (80423797)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywords5-HT2A受容体 / セロトニン受容体 / phencyclidine / PET / 18F-altanserin / schizophrenia / social interaction / rats
Outline of Final Research Achievements

Phencyclidine (PCP) is a psychotomimetic drug that can induce schizophrenia-like symptoms in healthy individuals. In this study we demonstrated that subchronic administration of PCP (15 times, 10 mg/kg/day) increased 5-HT2A receptor density or affinity in the medial prefrontal cortex using positron emission tomography with a radioactive marker of serotonin 5-HT2A receptors, 18F-altanserin. We further showed that PCP-induced upregulation of 5-HT2A receptors was correlated with decreased social interaction. The current study suggests that hyper-serotonergic transmission via 5-HT2A receptors may contribute to pathogenesis of negative symptoms in schizophrenia.

Free Research Field

神経生理学

Academic Significance and Societal Importance of the Research Achievements

本研究は統合失調症様の症状をヒトに引き起こす麻薬であるフェンサイクリジン(PCP)慢性投与することにより、脳の前頭前皮質でセロトニン受容体のサブタイプである5-HT2A受容体の密度ないしセロトニンに対する親和性が亢進すること、またこの亢進が陰性症状の指標となっている見知らぬ個体に対する社会的接触時間の低下と関連があることを明らかにした。このことから、統合失調症における陰性症状の発症においても5-HT2A受容体を介した過剰なセロトニン伝達の関与が示唆される。

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Published: 2023-01-30  

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