Seasonal and photoperiodic effects on lipid droplet size and lipid peroxidation in the brown adipose tissue of bank voles Myodes glareolusReport as inadecuate




Seasonal and photoperiodic effects on lipid droplet size and lipid peroxidation in the brown adipose tissue of bank voles Myodes glareolus - Download this document for free, or read online. Document in PDF available to download.

Acta Theriologica

, Volume 57, Issue 4, pp 289–294

First Online: 18 May 2012Received: 09 November 2011Accepted: 03 May 2012

Abstract

Seasonal changes in lipid droplet size and lipid peroxidation in the brown adipose tissue BAT of wild bank voles were examined. In addition, a role of photoperiod in these changes was studied; bank voles were held from the birth under long photoperiod LP for 12 weeks, and then half of them was transferred to short photoperiod SP for 6 weeks and another one remained under LP. In the wild bank voles the absolute BAT weight was seasonally constant, while the significant differences in the lipid droplet size were observed. The smallest lipid droplets mean, 11 μm were seen in winter; they increased by 30 % in spring and reached the highest size 24 μm in summer. Lipid peroxidation in the BAT did not differ significantly between the seasons, although high intraseason variation of this process was noted. The laboratory experiment revealed that the size of lipid droplets was determined by photoperiod; SP induced 13-fold decrease, and continuous exposure to LP brought about a further 2.5-fold increase in the size of lipid droplets. Conversely, a significant decrease in lipid peroxidation was seen in LP bank voles in comparison with the SP animals. The data indicate that short photoperiod is responsible for the small size of lipid droplets in the BAT of bank voles during winter, which may be a necessary requirement for high thermogenic capacity of the tissue. Photoperiod appears also to affect lipid peroxidation in the BAT of these animals.

KeywordsBank vole Brown adipose tissue Lipid droplets Lipid peroxidation Photoperiod Communicated by: Jan M. Wójcik

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Author: Elżbieta Bonda-Ostaszewska - Tadeusz Włostowski - Alicja Krasowska - Paweł Kozłowski

Source: https://link.springer.com/







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