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• W4236078903 abstract "Abstract 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 C57BL/6J 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/6J 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 exhibited a decrease in both food consumption and activity with either WD or HFD compared to LFD, whereas female mice did not exhibit any differences in food intake and minimal changes in locomotor activity on any diet. 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 β cell area as well as reduced insulin sensitivity after HFD feeding compared to WD or LFD, whereas female mice did not. Conclusions: Male and female C57BL/6J mice exhibited strikingly different responses in weight, food consumption, locomotor activity, and β 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." @default.
• W4236078903 created "2022-05-12" @default.
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• W4236078903 date "2020-06-18" @default.
• W4236078903 modified "2023-09-29" @default.
• W4236078903 title "Phenotypic Sexual Dimorphism in Response to Dietary Fat Manipulation in C57BL/6J Mice" @default.
• W4236078903 doi "https://doi.org/10.21203/rs.3.rs-36103/v1" @default.
• W4236078903 hasPublicationYear "2020" @default.
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