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• W2003125564 endingPage "208" @default.
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• W2003125564 abstract "Serotonin (5hydroxytryptamine; 5-HT) was first discovered in 1948 in blood platelets and a few years later in the brain. Since then, investigations of 5-HT involvement in mental disorders have contributed to major advances in psychiatry. 5-m distances were initially linked to the p~ogenesis of depression. A subgroup of depressed patients was noted to have decreased 5-HT metabolism in the central nervous system (CNS) (van Praag and Korf 1971). Further studies indicated that lowered 5-HT metabolism correlated with particular dimensions of psychopathology that may occur within depressive disorders but likewise within other syndromes. One of these dimensions is dyscontrol of aggression, leading to suicide or to outwardly directed aggression (van Praag 1986). A second psychopathological dimension appears to be related to anxiety. Evidence relevant to this latter conclusion will be summarized in this article. Most data on the relationship of 5-HT to anxiety are derived from animal studies. Research using human subjects has only recently begun. We think that the substanti~ body of animal findings and the exciting new human data warrant a reexamination of the role of 5-HT in the pathogenesis of anxiety. We will propose a 5-HT hypothesis of anxiety that takes into account 5-HT availability as well as receptor sensitivity. H-IT Systems in the Brain The raphe nuclei in the brain stem, encompassing the dorsal raphe and medial raphe nuclei, contain the cell bodies of 5-HT-producing neurons. From there, six major projections ascend to the forebrain, two tracts within the median forebrain bundle and four outside of it. Cortex, hypothalamus, thalamus, basal ganglia, substantia nigra, caudate, putamen, amygdala, hippocampus, septum, tegmentum, and mamillary bodies are all innervated by 5-HT neurons (Azmitia and Segal 1978). Two major subcategories of 5HT receptors have been identified in the CNS, labeled 5-HTr (Perot&a 1984) and 5-HT2 (Leysen et al. 1984). 5-HTr receptors are further su~Iassifi~ as 5-HTr,, 5-HTu,, 5HTr,, and 5-HTrd receptors. 5-HT,, receptors display a very high affinity for 8-hydroxyNJV-dipropyl-2-aminotetralin (80HDAP) and are found in the human frontal cortex and" @default.
• W2003125564 created "2016-06-24" @default.
• W2003125564 creator A5019208350 @default.
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• W2003125564 creator A5052107665 @default.
• W2003125564 creator A5062786102 @default.
• W2003125564 date "1988-01-01" @default.
• W2003125564 modified "2023-10-16" @default.
• W2003125564 title "Serotonin and anxiety revisited" @default.
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