A high-fat diet catalyzes progression to hyperglycemia in mice with selective impairment of insulin action in Glut4-expressing tissues
| Autor: | Daniel J. Horan, Hyun Cheol Roh, Aaron C. Ericsson, Surabhi D. Abhyankar, Natalie D. Stull, Xiaocheng C. Dong, Alexander G. Robling, Hongxia Ren, Robert N. Bone, Austin M. Reilly, Shijun Yan, Jason M. Conley, Carmella Evans-Molina, Menghao Huang |
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| Rok vydání: | 2022 |
| Předmět: |
insulin receptor (INSR)
HFD high-fat diet OGTT oral glucose tolerance test medicine.medical_treatment Glucose uptake ROI region of interest Type 2 diabetes Biochemistry type 2 diabetes (T2DM) Insr insulin receptor Mice insulin resistance Hyperinsulinemia Insulin glucose transporter type 4 (GLUT4) Mice Knockout Glucose Transporter Type 4 diabetes biology GLUT4 glucose transporter type 4 GIRKO GLUT4 promoter-driven insulin receptor knockout FFPE formalin-fixed paraffin-embedded IPGTT intraperitoneal glucose tolerance test LPS lipopolysaccharide MIRKO muscle-Insr-KO Research Article medicine.medical_specialty glucose metabolism T2D type 2 diabetes Diet High-Fat GSIS glucose-stimulated insulin secretion Insulin resistance Diabetes mellitus Internal medicine Glucose Intolerance medicine Animals Molecular Biology micro-CT micro-computed tomography NCD normal chow diet business.industry VLDL very-low-density lipoprotein nutritional and metabolic diseases DIO diet-induced obesity Cell Biology medicine.disease Mice Inbred C57BL FIRKO fat-Insr-KO Insulin receptor Endocrinology Diabetes Mellitus Type 2 Hyperglycemia biology.protein diet business metabolism GLUT4 |
| Zdroj: | The Journal of Biological Chemistry |
| ISSN: | 0021-9258 |
| Popis: | Insulin resistance impairs postprandial glucose uptake through glucose transporter type 4 (GLUT4) and is the primary defect preceding type 2 diabetes. We previously generated an insulin-resistant mouse model with human GLUT4 promoter-driven insulin receptor knockout (GIRKO) in the muscle, adipose, and neuronal subpopulations. However, the rate of diabetes in GIRKO mice remained low prior to 6 months of age on normal chow diet (NCD), suggesting that additional factors/mechanisms are responsible for adverse metabolic effects driving the ultimate progression of overt diabetes. In this study, we characterized the metabolic phenotypes of the adult GIRKO mice acutely switched to high-fat diet (HFD) feeding in order to identify additional metabolic challenges required for disease progression. Distinct from other diet-induced obesity (DIO) and genetic models (e.g., db/db mice), GIRKO mice remained leaner on HFD feeding, but developed other cardinal features of insulin resistance syndrome. GIRKO mice rapidly developed hyperglycemia despite compensatory increases in β-cell mass and hyperinsulinemia. Furthermore, GIRKO mice also had impaired oral glucose tolerance and a limited glucose-lowering benefit from exendin-4, suggesting that the blunted incretin effect contributed to hyperglycemia. Secondly, GIRKO mice manifested severe dyslipidemia while on HFD due to elevated hepatic lipid secretion, serum triglyceride concentration, and lipid droplet accumulation in hepatocytes. Thirdly, GIRKO mice on HFD had increased inflammatory cues in the gut, which were associated with the HFD-induced microbiome alterations and increased serum lipopolysaccharide (LPS). In conclusion, our studies identified important gene/diet interactions contributing to diabetes progression, which might be leveraged to develop more efficacious therapies. |
| Databáze: | OpenAIRE |
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