Short day-induced depletion of lipid stores is fat pad- and gender-specific in Siberian hamsters

Physiology & Behavior
Timothy J Bartness

Abstract

The naturally occurring, short day (SD)-induced decrease in body mass in male Siberian hamsters is due almost exclusively to decreases in body fat during the first few weeks of SD exposure. This decrease in body fat is not uniformly distributed among the white adipose tissue (WAT) pads. The purpose of the present experiment was to answer four questions: (i) Are the SD-induced preferential decreases in internally located fat pad mass gender specific?; (ii) Does gonadectomy and/or steroid replacement therapy alter this pattern of body fat depletion?; (iii) What is the role of lipoprotein lipase (LPL) activity in this process?; and (iv) Does SD-induced functional castration affect food intake, body mass and lipid-related fat responses similarly to surgical castration? Adult male and female Siberian hamsters were housed in long days (LD) for 6 wk following castration (CAST) or ovariectomy (OVX) combined with either SC implants of testosterone (T), estradiol or the cholesterol control (CHOL). While the remaining animals of both sexes remained gonadally intact. At this time, half the animals in each group were transferred to SDs for 6 wk. SD-housed gonad-intact males and females exhibited gonadal regression and decreased body mass an...Continue Reading

References

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Citations

Mar 14, 2002·Physiology & Behavior·Diane E DayTimothy J Bartness
Oct 23, 1997·Physiology & Behavior·M M Mauer, T J Bartness
May 10, 2005·The Proceedings of the Nutrition Society·Timothy J BartnessMichelle T Foster
Apr 17, 2014·Frontiers in Neuroendocrinology·Timothy J BartnessVitaly Ryu
Sep 15, 2009·Molecular and Cellular Endocrinology·Timothy J BartnessC K Song
Feb 20, 2009·Physiology & Behavior·Brett J W Teubner, Timothy J Bartness
Jul 22, 2014·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Marshall D McCueMichał S Wojciechowski
Dec 3, 2014·Frontiers in Neuroendocrinology·Francis J P Ebling
Jan 15, 2014·Physiology & Behavior·John T Garretson, Timothy J Bartness
Apr 27, 2007·Journal of Lipid Research·Timothy J Bartness, C K Song
Nov 12, 2015·PloS One·Barbara NoliCristina Cocco
Mar 7, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nilton A BritoTimothy J Bartness
Jun 10, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·D L DrazenR J Nelson
Dec 22, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·S D Bilbo, R J Nelson
Dec 18, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Gregory E DemasThomas W Gettys
Oct 20, 2001·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·G E Demas, T J Bartness

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