Time- and dose-dependent effects of the serotonergic agent quipazine on regional cerebral metabolism in rats.

Abstract:

:The time course and the relation to dose of regional cerebral metabolic rates for glucose (rCMRglc) were measured in awake male adult Fischer-344 rats after administration of quipazine, a serotonin 5-HT2-3 receptor agonist. rCMRglc was determined, using the quantitative autoradiographic [14C]deoxyglucose technique, in 92 brain regions at 30, 60, 90 and 120 min after quipazine 20 mg/kg i.p. and at 60 min after quipazine 5 mg/kg i.p. Peak metabolic effects were observed 60 min after quipazine 20 mg/kg i.p. when rCMRglc was significantly elevated in 27 (29%) brain regions (mean rise 17%). Quipazine increased rCMRglc in brain regions with high densities of 5-HT3 receptors (area postrema, olfactory tubercle, amygdala), in dopaminergic nuclei (substantia nigra pars compacta and pars reticulata) and terminal fields of their projections (zona incerta, subthalamic nucleus, preoptic magnocellular area, nucleus of facial nerve). The topographic distribution and direction of rCMRglc changes induced by quipazine are different from those produced by the 5-HT2 agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane and, consistent with the pharmacological and binding properties of quipazine, suggest a preferential activation of 5-HT3 receptors.

journal_name

Brain Res

journal_title

Brain research

authors

Freo U,Ricchieri GL,Holloway HW,Soncrant TT

doi

10.1016/0006-8993(93)91380-b

subject

Has Abstract

pub_date

1993-01-15 00:00:00

pages

249-56

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(93)91380-B

journal_volume

600

pub_type

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