Leptin acts on metabolism in a photoperiod-dependent manner, but has no effect on reproductive function in the seasonally breeding Siberian hamster (Phodopus sungorus)

被引:65
作者
Atcha, Z
Cagampang, FRA
Stirland, JA
Morris, ID
Brooks, AN
Ebling, FJP
Klingenspor, M
Loudon, ASI
机构
[1] Univ Manchester, Sch Biol Sci, Manchester M13 9PT, Lancs, England
[2] AstraZeneca CTL, Macclesfield SK10 4TJ, Cheshire, England
[3] Univ Nottingham, Sch Biomed Sci, Nottingham NG7 2UH, England
[4] Univ Marburg, Fachbereich Biol Zool, D-35043 Marburg, Germany
关键词
D O I
10.1210/en.141.11.4128
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Leptin may play a role in appetite regulation and metabolism, but its reproductive role is less clear. In photoperiodic Siberian hamsters, seasonal changes in fatness, leptin gene expression, and metabolism occur synchronously with activation or suppression of reproduction, analogous to puberty. Here, we test the hypothesis that seasonal changes in leptin secretion mediate the photoperiodic regulation of reproduction. Mature male and ovariectomized estrogen-treated female Siberian hamsters were kept in long (LD; 16 h of light, 8 h of darkness) or short days (SD: 8 h of light, 16 h of darkness) for 8 weeks, and recombinant murine leptin (15 mug/day) was infused for 2 weeks via osmotic minipumps. SD hamsters exhibited significant weight and fat losses, reduced serum leptin and food intake, and suppressed pituitary LII concentration. Leptin did not suppress food intake over the a-week treatment on either photoperiod, but significantly reduced fat reserves in SD hamsters. Leptin had no significant effect on pituitary LH concentrations in either sex or photoperiod or on testicular size and testosterone concentrations in males. These results suggest hamsters are more responsive to leptin on SD than on LD and that effects on food intake and fat loss can be dissociated in this species. Our data suggest that leptin does not mediate photoperiodic reproductive changes.
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收藏
页码:4128 / 4135
页数:8
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