2017, Volume 11, Issue 2
Frontiers of Medicine >> 2017, Volume 11, Issue 2 doi: 10.1007/s11684-017-0530-y
Postnatal feeding with high-fat diet induces obesity and precocious puberty in C57BL/6J mouse pups: a novel model of obesity and puberty
1. Department of Endocrinology, Children’s Hospital, Zhejiang University School of Medicine, Hangzhou 310051, China.
2. Department of Neurobiology, Institute of Neuroscience, and the Collaborative Innovation Center for Brain Science, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang University School of Medicine, Hangzhou 310058, China
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Abstract
Childhood obesity and obesity-related metabolic complications are induced by a high-fat postnatal diet. The lack of a suitable animal model, however, remains a considerable challenge in obesity studies. In the current study, we provided high-fat diet (HFD) to dams during lactation and to pups after weaning. We also developed a novel model of C57BL/6J mouse pups with HFD-induced postnatal obesity. Results showed that feeding with HFD induces fat deposition and obesity in pups. Furthermore, HFD more potently increased the body weight (BW) of male than female pups. HFD-fed female pups were obese, underwent precocious puberty, and showed increased kisspeptin expression in the hypothalamus. However, parental obesity and precocious puberty exerted no synergistic effects on the HFD-induced postnatal weight gain and puberty onset of the pups. Interestingly, some HFD-fed litters with normal BW also exhibited precocious puberty. This finding suggested that diet composition but not BW triggers puberty onset. Our model suggests good construction validity of obesity and precocious puberty. Furthermore, our model can also be used to explore the mutual interactions between diet–induced postnatal childhood obesity and puberty.
Keywords
postnatal HFD feeding ; obesity ; kisspeptin ; HPG axis ; precocious puberty
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