Serotonin model of schizophrenia: emerging role of glutamate mechanisms

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• 作者：Aghajanian ; George K. ; Marek ; Gerard J.
• 关键词：Hallucinogen ; 5-HT_2A receptor ; Ketamine ; Locus coeruleus ; LSD ; Metabotropic receptor ; NMDA receptor ; Phencylidine ; Prefrontal cortex
• 刊名：Brain Research Reviews
• 出版年：2000
• 出版时间：March, 2000
• 年：2000
• 卷：31
• 期：2-3
• 页码：302-312
• 全文大小：334 K

文摘

The serotonin (5-HT) hypothesis of schizophrenia arose from early studies on interactions between the hallucinogenic drug LSD (d-lysergic acid diethylamide) and 5-HT in peripheral systems. More recent studies have shown that the two major classes of psychedelic hallucinogens, the indoleamines (e.g., LSD) and phenethylamines (e.g., mescaline), produce their central effects through a common action upon 5-HT₂ receptors. This review focuses on two brain regions, the locus coeruleus and the cerebral cortex, where the actions of indoleamine and the phenethylamine hallucinogens have been shown to be mediated by 5-HT_2A receptors; in each case, the hallucinogens (via 5-HT_2A receptors) have been found to enhance glutamatergic transmission. In the prefrontal cortex, 5-HT_2A-receptors stimulation increases the release of glutamate, as indicated by a marked increase in the frequency of excitatory postsynaptic potentials/currents (EPSPs/EPSCs) in the apical dendritic region of layer V pyramidal cells; this effect is blocked by inhibitory group II/III metabotropic glutamate agonists acting presynaptically and by an AMPA/kainate glutamate antagonist, acting postsynaptically at non-NMDA glutamate receptors. A major alternative drug model of schizophrenia, previously believed to be entirely distinct from that of the psychedelic hallucinogens, is based on the psychotomimetic properties of antagonists of the NMDA subtype of glutamate receptor (e.g., phencylidine and ketamine). However, recently it has been found that many of the effects of the NMDA antagonists may also (1) involve 5-HT_2A receptors and (2) be mediated through excess activity at non-NMDA (i.e., AMPA/kainate) glutamate receptors. Moreover, pharmacological manipulations of glutamate transmission (e.g., by inhibitory metabotropic glutamate agonists) provide unexpected parallels between the actions of these two classes of drugs. Given an emerging recognition of the importance of alterations in glutamatergic transmission in the actions of both psychedelic hallucinogens an NMDA antagonists, this review concludes with of implications for the pathophysiology and therapy of schizophrenia. rial"" size=""-1"" color=""black""> Publisher: rial"" size=""-1"" color=""black""> Elsevier Science rial"" size=""-1"" color=""black""> Language of Publication: rial"" size=""-1"" color=""black""> English rial"" size=""-1"" color=""black""> Item Identifier: rial"" size=""-1"" color=""black""> S0165-0173(99)00046-6 rial"" size=""-1"" color=""black""> Publication Type: rial"" size=""-1"" color=""black""> Article rial"" size=""-1"" color=""black""> ISSN: rial"" size=""-1"" color=""black""> 0165-0173 rial"" size=""-1"" color=""black""> Cited by: rial"" size=""-1"" color=""black"">

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rial"" size=""-1"" color=""black""> Footnotes:

1. Part of this review was presented at the Seventh International Congress of Biological Psychiatry in Berlin, Germany, 1-7 July 2001.