Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/9748
Citations | ||
Scopus | Web of ScienceĀ® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | The effect of ovarian steroids and photoperiod on body fat stores and uncoupling protein 2 in the marsupial Sminthopsis crassicaudata |
Author: | Hope, P. Turnbull, H. Breed, W. Morley, J. Horowitz, M. Wittert, G. |
Citation: | Physiology and Behavior, 2000; 69(4-5):463-470 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2000 |
ISSN: | 0031-9384 1873-507X |
Abstract: | To determine the effects of photoperiod and ovarian steroids on fat stores in the marsupial S. crassicaudata, animals were ovariectomised (OVX) or sham operated, and maintained under either short-day (SD) or long-day (LD) photoperiods for 104 days. Photoperiod had no effect on body weight in the sham animals. In the LD OVX animals, body weight fell and remained below baseline for about 45 days, whereafter it returned to baseline. In contrast, body weight of SD OVX animals increased over the first 45 days then returned to baseline. Tail width (a reflection of body fat stores) increased in both sham and OVX animals exposed to SD. When exposed to LD, tail width increased only in the OVX animals. There was no effect of either photoperiod or OVX on total cumulative energy intake. Leptin mRNA expression was increased in the LD OVX animals compared to the shams. Photoperiod had no effect on UCP2 mRNA expression in any tissue; however, OVX decreased UCP2 mRNA expression in muscle. These data indicate that in S. crassicaudata: (a) fat mass increases in response to both SD photoperiod and OVX and they have additive effects; (b) the effects of photoperiod on fat mass are mediated by both gonadal steroid dependent and independent mechanisms; (c) alterations in UCP2 mRNA expression may mediate the effect of OVX, but not photoperiod; and (d) UCP2 mRNA is differentially regulated in muscle and fat. |
Keywords: | Ovary Adipose Tissue Tail Animals Marsupialia Body Weight Leptin Proteins Membrane Transport Proteins Ion Channels Mitochondrial Proteins RNA, Messenger Body Weights and Measures Body Temperature Ovariectomy Body Composition Energy Intake Photoperiod Female Uncoupling Protein 2 |
DOI: | 10.1016/S0031-9384(99)00264-4 |
Published version: | http://dx.doi.org/10.1016/s0031-9384(99)00264-4 |
Appears in Collections: | Aurora harvest 4 Environment Institute publications Medicine publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.