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Development of high fat diet-induced obesity and leptin resistance in C57Bl/6J mice

Abstract

OBJECTIVE: To investigate the development of high fat diet-induced obesity and leptin resistance.

DESIGN: Two experiments were carried out in this study. Firstly, we fed the mice with a high- or low-fat diet for up to 19 weeks to examine a progressive development of high fat diet-induced obesity. Secondly, we examined peripheral and central exogenous leptin sensitivity in mice fed high- or low-fat diets for 1, 8 or 19 weeks.

SUBJECTS: A total of 168 C57BL/6J mice (3 weeks old) were used in this study.

MEASUREMENTS: In the first experiment, we measured the body weight, energy intake, adipose tissue mass, tibia bone length, and plasma leptin in mice fed either a high- or low-fat diet for 1, 8, 15 and 19 weeks. In the second experiment, body weight change and cumulative energy intake were measured at 6 h intervals for 72 h after leptin injection in mice fed a high- or low-fat diet for 1, 8 or 19 weeks.

RESULTS: The results from the first experiment suggested that the development of high fat diet-induced obesity in mice could be divided into early, middle and late stages. Compared with the mice fed a low-fat diet, the mice fed a high-fat diet showed a gradually increased body weight (+5.2%), fat storage (epididymal plus perirenal; +6.7%) and plasma leptin (+18%) at 1 week; +11.4%, +68.1%, and +223%, respectively, at 8 weeks; and +30.5%, +141%, and +458%, respectively, at 19 weeks. Energy intake of high fat diet-fed mice was equal to that of low fat diet-fed controls for the first 3 weeks; it fell below control levels over the next 5 week period, but began to increase gradually after 8 weeks of high-fat diet feeding and then increased dramatically from 15 weeks to be 14% higher than that of controls after 19 weeks. The results from our second experiment showed that: (1) after 1 week of feeding, the mice fed a high-fat diet were sensitive to a 2 μg/g (body weight) intraperitoneal (i.p.) injection of leptin, with no differences in body weight change or cumulative energy intake post-injection; (2) after 8 weeks of feeding, the mice fed a high-fat diet were insensitive to 2 μg/g (body weight) i.p. leptin, but were sensitive to a 0.1 μg intracerebroventricular (i.c.v.) injection of leptin; (3) after 19 weeks of feeding, the mice fed a high-fat diet were insensitive to 0.1 μg i.c.v. leptin, but were sensitive to a high dose of 2 μg i.c.v. leptin.

CONCLUSIONS: The present study demonstrated that the development of high fat diet-induced obesity (19 weeks) in C57 B1/6J mice could be divided into three stages: (1) an early stage in response to high-fat diet that mice were sensitive to exogenous leptin; (2) a reduced food intake stage when mice had an increase in leptin production and still retained central leptin sensitivity; and (3) an increased food intake stage, accompanied by a reduction of central leptin sensitivity.

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Acknowledgements

We wish to thank Dr Ken Russell (Department of Applied Statistics, University of Wollongong) for suggestions regarding the statistical analysis. This study was supported by grants from the National Health and Medical Research Council of Australia.

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Correspondence to XF Huang.

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Lin, S., Thomas, T., Storlien, L. et al. Development of high fat diet-induced obesity and leptin resistance in C57Bl/6J mice. Int J Obes 24, 639–646 (2000). https://doi.org/10.1038/sj.ijo.0801209

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