Related Experiment Video
Updated: Apr 30, 2026
03:07
Development and Validation of a Methodology for Establishing Obese Rat Models with Typical Fatty Pancreas
Published on: November 11, 2025
577
Diabetic complications in obese type 2 diabetic rat models
Yoshiaki Katsuda1, Takeshi Ohta, Katsuhiro Miyajima
1Japan Tobacco Inc., Central Pharmaceutical Research Institute, 1-1 Murasaki-cho, Takatsuki, Osaka 569-1125, Japan.
Experimental Animals
|April 29, 2014
Summary
This study reviews type 2 diabetes complications in obese rat models, detailing pancreatic, renal, and retinal changes. It highlights decreased nerve conduction, osteoporosis, and sexual dysfunction in these models.
Area of Science:
- Endocrinology
- Pathophysiology
- Animal Models
Background:
- Obesity and type 2 diabetes are significant global health concerns.
- Understanding the pathophysiological progression of diabetes and its complications is crucial for developing effective treatments.
- Obese type 2 diabetic rat models offer valuable insights into human disease mechanisms.
Purpose of the Study:
- To overview the pathophysiological features of type 2 diabetes and its complications in various obese rat models.
- To classify pancreatic, renal, and retinal changes associated with diabetes progression.
- To document other observed complications such as neuropathy, osteoporosis, and sexual dysfunction.
Main Methods:
- Review of existing literature on obese type 2 diabetic rat models.
- Analysis of reported pathophysiological changes in pancreatic islets, renal structures, and retinal tissues.
- Compilation of data on functional and metabolic complications.
Main Results:
- Pancreatic changes included islet hypertrophy, β cell degranulation, islet atrophy, and fibrosis.
- Renal lesions observed in tubules and glomeruli, with notable nodular changes in OLETF and SDT fatty rats.
- Retinal findings included folding and thickening in SDT fatty rats; decreased motor nerve conduction velocity, osteoporosis, and sexual dysfunction were also reported.
Conclusions:
- Obese type 2 diabetic rat models exhibit a range of diabetic complications mirroring human conditions.
- These models are instrumental in studying diabetes pathophysiology and evaluating potential therapeutic interventions.
- Further research using these models can elucidate mechanisms underlying diabetic complications and inform clinical practice.
Related Concept Videos
01:24Type II Diabetes II: Pathophysiology
28
PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
28
01:22Complications of Diabetes Mellitus
35
Diabetes mellitus is a chronic metabolic disorder characterized by persistent hyperglycemia due to insulin deficiency, resistance, or both. Prolonged hyperglycemia disrupts metabolic homeostasis and leads to acute and chronic complications.Acute ComplicationsAcute complications result from sudden metabolic imbalance.Diabetic ketoacidosis (DKA) mainly appears in type 1 diabetes but may also develop in type 2 diabetes, particularly under extreme stress. It arises from severe insulin deficiency,...
35
01:26Type I Diabetes II: Pathophysiology
75
Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular...
75
01:27Diabetic Retinopathy
55
DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
55
01:26Type II Diabetes I: Introduction
17
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
17
01:19Type I Diabetes III: Clinical Manifestations
26
Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the...
26