Phenotypic sexual dimorphism in response to dietary fat manipulation in C57BL/6J mice

被引:110
|
作者
Casimiro, Isabel [1 ]
Stull, Natalie D. [2 ]
Tersey, Sarah A. [1 ]
Mirmira, Raghavendra G. [1 ]
机构
[1] Univ Chicago, Sect Endocrinol Diabet & Metab, Dept Med, Chicago, IL 60637 USA
[2] Indiana Biosci Res Inst, Indianapolis, IN 46202 USA
基金
美国国家卫生研究院;
关键词
Sexual dimorphism; Obesity; High fat diet; Western diet; C57BL/6J; BETA-CELL FAILURE; INDUCED OBESITY; BODY-WEIGHT; MOUSE; METABOLISM; ACTIVATION; STRESS; GENDER; MODELS;
D O I
10.1016/j.jdiacomp.2020.107795
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background: Obesity and the metabolic syndrome are increasingly prevalent in society and their complications and response to treatment exhibit sexual dimorphism. Mouse models of high fat diet-induced obesity are commonly used for both mechanistic and therapeutic studies of metabolic disease and diabetes. However, the inclusion of female mammals in obesity research has not been a common practice, and has resulted in a paucity of data regarding the effect of sex on metabolic parameters and its applicability to humans. Methods: Here we analyzed male and female C57BLI6 J mice beginning at 4 weeks of age that were placed on a low-fat diet (LFD, 10% calories from fat), a Western Diet (WD, 45% calories from fat), or a high fat diet (HFD, 60% calories from fat). Assessments of body composition, glucose homeostasis, insulin production, and energy metabolism, as well as histological analyses of pancreata were performed. Results: Both male and female C57BL/6 J mice had similar increases in total percent body weight gain with both WD and HFD compared to LFD, however, male mice gained weight earlier upon HFD or WD feeding compared to female mice. Male mice maintained their caloric food intake while reducing their locomotor activity with either WD or HFD compared to LFD, whereas female mice increased their caloric food intake with WD feeding. Locomotor activity of female mice did not significantly change upon WD or HFD feeding, yet female mice exhibited increased energy expenditure compared to WD or HFD fed male mice. Glucose tolerance tests performed at 4. 12 and 20 weeks of dietary intervention revealed impaired glucose tolerance that was worse in male mice compared to females. Furthermore, male mice exhibited an increase in pancreatic beta cell area as well as reduced insulin sensitivity alter HFD feeding compared to WD or LFD, whereas female mice did not. Conclusions: Male and female CS7BL/6 J mice exhibited strikingly different responses in weight, food consumption, locomotor activity, energy expenditure and beta 1.5 cell adaptation upon dietary manipulation, with the latter exhibiting less striking phenotypic changes. We conclude that the nature of these responses emphasizes the need to contextualize studies of obesity pathophysiology and treatment with respect to sex. (C) 2020 The Authors.
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页数:9
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