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The distribution of 5-HT1D and 5-HT1E binding sites in human brain

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Abstract

Total 5-HTI, 5-HT1D and 5-HT1E binding sites were measured in homogenates of human frontal cortex, hippocampus, amygdala, globus pallidus, caudate and putamen. Combined 5-HT1D1E sites were the predominant 5-HTI subtype (66–95% of total 5-HT1 sites) in all regions except hippocampus (38% of total 5-HTI sites). Globus pallidus contained the highest density and the highest proportion of 5HT1D sites (74% of total 5-HT1 sites). 5HT1D sites in the other brain areas accounted for 19–27% of the total 5-HT1 sites. The highest densities and the highest proportions of 5-HTIE sites were in caudate (72%) and putamen (64%) and the lowest density and lowest proportion in hippocampus (16%).

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      The existence of 5-ht1e receptors was first described in the human cortex as the population of [3H]-5-HT binding sites remaining following the blockade of 5-HT1A, 5-HT1B, and 5-HT1D receptors with 100 nM 5-CT and of 5-HT2C receptors with 100 nM mesulergine (Leonhardt, Herrick-Davis, & Titeler, 1989). Subsequent autoradiographic (Miller & Teitler, 1992) and binding studies (Lowther, DePaermentier, Crompton, & Horton, 1992) also in the human brain described the presence of high densities of this receptor in caudate, putamen, medial and lateral globus pallidus, amygdala, frontal cortex, and lower densities in hippocampus. Cloning efforts confirmed the existence in the human genome of a gene coding for a receptor with the characteristics of 5-ht1e binding sites (McAllister et al., 1992; Zgombick et al., 1992); several years later the guinea pig 5-ht1e receptor was also cloned (Bai et al., 2004).

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