title: Development of a nongenetic mouse model of type 2 diabetes.
abstract: Insulin resistance and loss of β-cell mass cause Type 2 diabetes (T2D). The objective of this study was to generate a nongenetic mouse model of T2D. Ninety-six 6-month-old C57BL/6N males were assigned to 1 of 12 groups including (1) low-fat diet (LFD; low-fat control; LFC), (2) LFD with 1 i.p. 40 mg/kg BW streptozotocin (STZ) injection, (3), (4), (5), (6) LFD with 2, 3, 4, or 5 STZ injections on consecutive days, respectively, (7) high-fat diet (HFD), (8) HFD with 1 STZ injection, (9), (10), (11), (12) HFD with 2, 3, 4, or 5 STZ injections on consecutive days, respectively. After 4 weeks, serum insulin levels were reduced in HFD mice administered at least 2 STZ injections as compared with HFC. Glucose tolerance was impaired in mice that consumed HFD and received 2, 3, or 4 injections of STZ. Insulin sensitivity in HFD mice was lower than that of LFD mice, regardless of STZ treatment. Islet mass was not affected by diet but was reduced by 50% in mice that received 3 STZ injections. The combination of HFD and three 40 mg/kg STZ injections induced a model with metabolic characteristics of T2D, including peripheral insulin resistance and reduced β-cell mass.
authors.affiliation: Department of Human Nutrition, Foods and Exercise, College of Agriculture and Life Sciences, Virginia Tech, Blacksburg, VA 24061, USA.
authors.forename: Elizabeth R
authors.initials: ER
authors.lastname: Gilbert
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Fu
authors.forename: Dongmin
authors.initials: D
authors.lastname: Liu
mesh_terms: D000818:Animals; D001835:Body Weight; D003924:Diabetes Mellitus, Type 2 / Q000209:etiology* / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D059305:Diet, High-Fat / Q000009:adverse effects*; D004195:Disease Models, Animal; D002149:Energy Intake; D018149:Glucose Intolerance / Q000209:etiology; D006943:Hyperglycemia / Q000209:etiology; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D050152:Intra-Abdominal Fat / Q000473:pathology; D007515:Islets of Langerhans / Q000473:pathology; D008075:Lipoproteins, HDL / Q000097:blood; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009929:Organ Size; D011897:Random Allocation; D013311:Streptozocin; D013997:Time Factors
chemical_list: D007328:Insulin; D008075:Lipoproteins, HDL; D013311:Streptozocin