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The effects of photic and nonphotic stimuli in the 5-HT7 receptor knockout mouse.

Abstract：

:5-HT and agonists of the 5-HT receptor can modify the response of the mammalian pacemaker, which is located in the hypothalamic suprachiasmatic nuclei (SCN), to photic and nonphotic stimulation. Previous studies suggest that the 5-HT7 receptor is involved in the regulation of photic input, and the modulation of nonphotic circadian resetting of the circadian clock. The present study investigated the role of the 5-HT7 receptor by evaluating a wide variety of circadian parameters in mice lacking a functional allele for this receptor (5-HT7 knockout (KO)) compared with wild type (WT) animals that were bred on the same genetic background, including rate of entrainment, photic responsiveness and nonphotic response to a serotonergic agonist. No significant differences were detected in the average number of days 5-HT7 KO mice needed to reach entrainment to an advance of 6 h in the LD cycle compared with WT animals. Further, we investigated the acute responsiveness of both groups of mice to acute light stimulation at various times (circadian time (CT) 0, 6, 9, 12, 14, 16, 18, 20 and 22). A significant difference in the phase resetting response to light between the groups was revealed at CT22. Finally, as the 5-HT7 receptor has been associated with the modulation of nonphotic resetting in vitro, we examined the response of the 5-HT7 KO mice to systemic administration of a 5-HT(1A/7) agonist. The current study is the first to demonstrate the elimination of a nonphotic response to (+) 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) in mice lacking the 5-HT7 receptor compared with WT animals in vivo. Taken together, the present findings provide additional evidence that reform the established view on the role of the 5-HT7 in the photic regulation of retinohypothalamic (RHT) input, and support further the involvement of the 5-HT7 receptor in the modulation of nonphotic resetting in circadian clock.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Gardani M,Biello SM

doi

10.1016/j.neuroscience.2007.10.028

subject

Has Abstract

pub_date

2008-03-03 00:00:00

pages

245-53

issue

1

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(07)01356-5

journal_volume

152

pub_type

杂志文章

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