title: A novel model of type 2 diabetes mellitus based on obesity induced by high-fat diet in BDF1 mice.
abstract: For experimental research on type 2 diabetes mellitus, a diet-induced obesity-dependent diabetes model developed using genetically normal animals is essential. However, attempts at feeding a high-fat diet (HFD) to major inbred strains of mice have not resulted in the establishment of an ideal model. Here, we show that BDF1 mice, the F(1) hybrids of C57BL/6 and DBA/2 normal strains, develop HFD-induced obesity-dependent diabetes. BDF1 mice fed a HFD gained weight rapidly and developed severe diabetes characterized by hyperglycemia, glucosuria, and elevation of hemoglobin A(1C) levels in 3 to 4 months. The glucose tolerance of the diabetic mice was significantly impaired, and the elevation of plasma insulin after a glucose load was significantly reduced. Isolated pancreatic islets of HFD-fed BDF1 mice showed decreased insulin content and a reduced insulin secretory response to higher concentrations of glucose. Immunohistochemical analysis of the pancreas showed reduced staining intensity to insulin and aberrant distribution of glucagon-positive cells in diabetic BDF1 mice. These observations suggest the cause of the diabetes in HFD-fed BDF1 mice to be dysfunction of the pancreatic beta-cells, which do not produce or secrete enough insulin to compensate for insulin resistance. BDF1 mice fed a HFD showing obesity-dependent diabetes are suggested to be an appropriate animal model of type 2 diabetes mellitus. This model would be useful for exploring the mechanism of obesity-dependent type 2 diabetes mellitus and evaluating antiobesity and antidiabetic drugs.
authors.affiliation: Biological Research Laboratories II, Daiichi Sankyo Co, Ltd, Tokyo 140 8710, Japan. karasawa.hiroshi.vr@daiichisankyo.co.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Karasawa
authors.forename: Seiko
authors.initials: S
authors.lastname: Nagata-Goto
authors.forename: Kiyosumi
authors.initials: K
authors.lastname: Takaishi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kumagae
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D002784:Cholesterol / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000209:etiology*; D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005951:Glucose Tolerance Test; D006029:Glycosuria / Q000652:urine; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000378:metabolism; D020738:Leptin / Q000097:blood; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008815:Mice, Inbred Strains; D008954:Models, Biological; D009765:Obesity / Q000150:complications*; D014280:Triglycerides / Q000097:blood; D015430:Weight Gain
chemical_list: D001786:Blood Glucose; D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D020738:Leptin; D014280:Triglycerides; D002784:Cholesterol