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論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Phenotypic and genotypic changes in obesity and type 2 diabetes of male KK mice with aging
掲載誌名	正式名：Experimental Animals 略　 称：Exp Anim. ISSNコード：13411357
掲載区分	国内
巻・号・頁	71(1),pp.71-81
著者・共著者	Yuzuru Iizuka, Hyounju Kim, Maki Nakasatomi, Akiyo Matsumoto, Jun Shimizu
担当区分	筆頭著者
発行年月	2022/02
概要	Research into the prevention and treatment of age-related metabolic diseases are important in the present-day situation of the aging population. We propose that an elderly diabetic mouse model may be useful to such research as it exhibits deterioration of glucose and lipid metabolism. Although the KK mouse strain is commonly used as a model of moderate obesity and type 2 diabetes, the utility of this strain as an elderly obese and diabetic model mouse for research into aging remains unclear. The present study aimed to investigate age-related changes of glucose and lipid metabolism in male KK mice fed a standard chow diet. We demonstrate that 40 weeks KK mice exhibit age-related dysfunctions, such as development of insulin resistance associated with pancreatic islet hypertrophy and decreased lipolysis in white adipose tissue (WAT) compared with 15 weeks KK mice. However, aging does not appear to cause mitochondrial dysfunction of brown adipose tissue. Unexpectedly, hyperglycemia, potential glucose uptake in insulin-sensitive organs, hepatic lipid accumulation, hypertrophy of adipocytes, and inflammation in epididymal WAT did not worsen but rather compensated in 40 weeks KK mice. Our data indicate that the use of male KK mice as an elderly obese and diabetic mouse model has some limitations and in order to represent a useful elderly obese and diabetic animal model, it may be necessary to induce deterioration of glucose and lipid metabolism in KK mice through breeding with high-sucrose or high-fat diets.
DOI	10.1538/expanim.21-0109