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WAY100635-induced augmentation of the 5-HT-elevating action of citalopram: relative importance of the dose of the 5-HT1A (auto)receptor blocker versus that of the 5-HT reuptake inhibitor.

Abstract：

:The elevation of extracellular 5-HT after systemic administration of 5-HT reuptake inhibiting drugs is strongly potentiated by agents capable of blocking 5-HT1A autoreceptors in the midbrain raphe. The present in vivo microdialysis study was aimed at assessing the relative importance of 5-HT reuptake inhibition versus 5-HT1A autoreceptor blockade in this interaction. Citalopram (0.5 or 5.0 mg/kg s.c.) dose-dependently increased dialysate 5-HT in the rat ventral hippocampus, maximally doubling the initial baseline values within 60 min after injection. The selective 5-HT1A receptor blocker, WAY100635 (0.01-0.3 mg/kg s.c.), further augmented, in a dose-dependent manner, the high-dose citalopram response (to approximately 4-5 x the pre-citalopram baseline). For comparison, the effect of low-dose (0.5 mg/kg s.c.) citalopram was mildly, but not significantly, potentiated by WAY100635 (0.3 mg/kg). WAY100635 given alone does not alter 5-HT under these conditions. The data confirm previous findings that 5-HT1A autoreceptor blockade enhances the citalopram-induced increase of extracellular 5-HT in the forebrain. To the extent the extracellular levels of 5-HT is a valid index, through 5-HT reuptake blockade appears to be the primary prerequisite for this interaction to occur. New drugs and/or treatment regimes based on the SSRI/5-HT1A autoreceptor blocker combination concept should, therefore, emphasize the former property.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Hjorth S,Westlin D,Bengtsson HJ

doi

10.1016/s0028-3908(97)00050-6

subject

Has Abstract

pub_date

1997-04-01 00:00:00

pages

461-5

issue

4-5

eissn

0028-3908

issn

1873-7064

journal_volume

36

pub_type

杂志文章

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