Animal model characterization demonstrates spontaneous chronic hyperglycemia, obesity, and renal complications in OLETF rats, highlighting a useful model for human type 2 diabetes.
Key Points
To establish and characterize the Otsuka Long-Evans Tokushima Fatty (OLETF) rat strain as a spontaneous model of human non-insulin-dependent diabetes mellitus.
Selectively bred a novel rat strain (OLETF) derived from an outbred Long-Evans rat displaying polyuria, polydipsia, and mild obesity.
Tracked clinical progression, male-specific inheritance, and age-dependent histological changes in pancreatic islets and renal tissue across lifespan stages.
OLETF rats exhibited late-onset hyperglycemia after 18 weeks of age, mild obesity, a chronic disease course, male inheritance, and nodular renal lesions.
Histological analysis revealed three stages of pancreatic islet changes: cellular infiltration and degeneration (6–20 weeks), hyperplasia (20–40 weeks), and a final degenerative stage (>40 weeks).