| Enhancement and suppression of ultradian and circadian rhythms across the female hamster reproductive cycle. | |
| | |
MedLine Citation:
|
PMID: 22653893 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The impact of ovarian hormones on hamster ultradian rhythms (URs) is unknown. We concurrently monitored URs and circadian rhythms (CRs) of home cage locomotor activity during the estrous cycle, pregnancy, and lactation of Syrian hamsters. URs with a mean period of 4-5 h were evident during the dark phase in more than 90% of females on days 1 and 2 of the estrous cycle but were significantly less prevalent on cycle days 3 and 4. The period of the UR did not vary as a function of estrous cycle stage, but at all stages, the UR period was longer in the dark than the light phase. The UR acrophase occurred significantly earlier on cycle day 4 than on days 1 and 2, and UR robustness and amplitude were reduced on days 3 and 4. Robustness, mesor, and amplitude of CRs were greater during cycle days 3 and 4; timing of the CR acrophase was delayed on day 4 relative to all other cycle days. Effects of the estrous cycle on URs were evident only during the dark phase. The proportion of hamsters displaying dark phase URs increased significantly during early and late gestation and decreased during lactation. Pregnancy significantly increased UR complexity, robustness, and amplitude. The emergence of URs over gestation was paralleled by decrements in the robustness and amplitude of CRs, which also were absent in a significant proportion of dams during lactation but re-emerged at weaning of litters. The changing endocrine profile of the estrous cycle, hormonal dynamics of pregnancy and lactation, and nursing demands placed on dams are each associated with alterations in the expression of ultradian and circadian locomotor rhythms. Diminution of CRs and augmentation of URs may afford greater behavioral flexibility during life stages when interactions with mates and offspring are less predictable. |
| | |
Authors:
|
Brian J Prendergast; Annaliese K Beery; Matthew J Paul; Irving Zucker |
Related Documents
:
|
6578773 - Partial hydatidiform mole: ultrasonographic features. 11445913 - Effect of isotretinoin on tooth germ and palate development in mouse embryos. 1693293 - Prenatal diagnosis of fetal hemoglobin lepore-boston disease on maternal peripheral blood. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of biological rhythms Volume: 27 ISSN: 1552-4531 ISO Abbreviation: J. Biol. Rhythms Publication Date: 2012 Jun |
Date Detail:
|
Created Date: 2012-06-01 Completed Date: 2012-10-09 Revised Date: 2013-03-20 |
Medline Journal Info:
|
Nlm Unique ID: 8700115 Medline TA: J Biol Rhythms Country: United States |
Other Details:
|
Languages: eng Pagination: 246-56 Citation Subset: IM |
Affiliation:
|
Department of Psychology and Committee on Neurobiology, University of Chicago, Chicago, IL 60637, USA. prendergast@uchicago.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Circadian Rhythm* Cricetinae Estrous Cycle Female Hormones / metabolism Lactation Locomotion Mesocricetus Models, Biological Models, Statistical Ovary / metabolism Pregnancy Pregnancy, Animal Reproduction / physiology* Time Factors |
| Grant Support | |
ID/Acronym/Agency:
|
R01 AI067406/AI/NIAID NIH HHS |
| Chemical | |
Reg. No./Substance:
|
0/Hormones |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: The circadian clock modulates enamel development.
Next Document: Does Pupil Constriction under Blue and Green Monochromatic Light Exposure Change with Age?