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First published online October 19, 2007
Journal of Experimental Biology 210, 3838-3847 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.010025
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Effects of photoperiod history on body mass and energy metabolism in Brandt's voles (Lasiopodomys brandtii)

Qin Lu1,2, Wen-Qin Zhong1 and De-Hua Wang1,*

1 State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China
2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

* Author for correspondence (e-mail: wangdh{at}ioz.ac.cn)

Accepted 21 August 2007

Many small mammals respond to seasonal changes in photoperiod via alterations in morphology, physiology and behaviour. In the present study, we tested the hypothesis that the preweaning (from embryo to weaning) photoperiod experience can affect subsequent development in terms of body mass and thermogenesis. Brandt's voles (Lasiopodomys brandtii) were gestated and reared to weaning under either a short (SD, 8 h:16 h L:D) or a long photoperiod (LD, 16 h:8 h L:D) at a constant ambient temperature (23°C). At weaning, male juveniles were either maintained in their initial photoperiod or transferred to the alternative photoperiod for 8 weeks. Postweaning SD voles had a lower body mass but higher thermogenic capacity compared with LD voles. At the same time, preweaning photoperiod conditions had long-lasting effects on thermogenic capacity later in life. Serum leptin concentration was positively correlated with body mass and body fat mass, whereas it was negatively correlated with energy intake and uncoupling protein 1 content in brown adipose tissue. Our results suggest that postweaning development in terms of body mass and thermogenesis is predominantly influenced by the postweaning photoperiod, while the preweaning photoperiod experience could chronically modify thermogenesis but not body mass. Furthermore, serum leptin, acting as a potential adipostatic signal, may be involved in the regulation of both energy intake and energy expenditure.

Key words: body mass, Brandt's voles (Lasiopodomys brandtii), energy intake, leptin, non-shivering thermogenesis capacity, photoperiod history, resting metabolic rate, uncoupling protein 1


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© The Company of Biologists Ltd 2007