QueryDate : 2016-12-24
Cites : 2
| ORIGINAL
ARTICLE |
| | | Data source : Google Scholar QueryDate : 2016-12-24 Cites : 2 |
Many
small mammals respond to seasonal changes in photoperiod by altering
body mass and adiposity. These animals may provide valuable models for
understanding the regulation of energy balance. In present study, we
examined the effect on body mass, rest metabolic rate, food intake and
body composition in cold-acclimated (5 °C) in Eothenomys miletus by
transferring them from a short (SD, 8h :16h L: D) to long day
photoperiod (LD, 16h: 8h L:D). During the first 4 weeks of exposure to
SD, E. miletus decreased body mass. After the next 4 weeks of exposure
to LD, which the average difference between body masses of LD and SD
voles was 4.76 g. This 14.74% increase in body mass reflected
significant increases in absolute amounts of body components, including
wet carcass mass, dry carcass mass and body fat mass. After correcting
body composition and organ morphology data for the differences in body
mass, only livers, kidney, and small intestine were enlarged due to
photoperiod treatment during cold exposure. E. miletus increased RMR
and energy intake exposure to LD, but maintained a stable level to SD
after 28 days. Serum leptin levels were positively correlated with body
mass, body fat mass, RMR as well as energy intake. All of the results
indicated that E. miletus may provide an attractive novel animal model
for investigation of the regulation of body mass and energy balance at
organism levels. Leptin is potentially involved in the photoperiod
induced body mass regulation and thermogenesis in E. miletus during
cold exposure.
