Abstract:
:In ovariectomized (OVX) Sprague-Dawley rats, estradiol benzoate (EB) has been reported to decrease rapid eye movement (REM) and non-REM (NREM) sleep during the dark phase for up to 3 days. It is unknown, however, if estrogenic effects on sleep extend beyond 3 days or if other estrogens could induce the same changes. Furthermore, it is unclear whether the increased wakefulness in the dark phase was due to changes in active or quiet wakefulness. Therefore, we examined the effects of daily injections of 17alpha-ethinyl estradiol (EE) for 6 days on sleep and wakefulness in the OVX rat. After 3 days of baseline recording using a telemetric system, rats were administered sesame oil (sc) for 3 days followed by injection with EE (20 mug/rat/day, sc) for 6 days. After treatment, sleep was recorded during hormone withdrawal for an additional 5 days. A few sporadic but statistically significant increases in light phase sleep occurred during the last 3 days of EE treatment. Starting on day 2 of the study, EE caused statistically significant decreases in dark phase REM sleep that were maintained throughout the treatment period and persisted until the 3rd day of hormone withdrawal. During the dark phase, statistically significant decreases in NREM sleep and increases in active wakefulness started on the second day of treatment and abated by the end of treatment. This study demonstrated that EE had similar effects on sleep-wakefulness to EB and demonstrates the utility of telemetric polysomnographic recording of the female OVX rat as a model for understanding the estrogen-induced changes on sleep-wakefulness.
journal_name
Horm Behavjournal_title
Hormones and behaviorauthors
Pawlyk AC,Alfinito PD,Johnston GH,Deecher DCdoi
10.1016/j.yhbeh.2007.09.018subject
Has Abstractpub_date
2008-01-01 00:00:00pages
217-24issue
1eissn
0018-506Xissn
1095-6867pii
S0018-506X(07)00239-5journal_volume
53pub_type
杂志文章abstract::This article is part of a Special Issue "Chemosignals and Reproduction". A rich variety of chemosignals have been identified that influence mammalian behaviour, including peptides, proteins and volatiles. Many of these elicit innate effects acting either as pheromones within species or allelochemicals between species....
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