[Approach to creating early diabetic peripheral neuropathy rat model]

Area of Science:

• Animal models in diabetes research
• Neuropathy research
• Metabolic disease studies

Background:

• Diabetic peripheral neuropathy (DPN) is a common complication of type 2 diabetes mellitus (T2DM).
• Developing reliable animal models is crucial for understanding DPN pathogenesis and testing interventions.
• Early detection of DPN is essential for timely management.

Purpose of the Study:

• To establish an early diabetic peripheral neuropathy (DPN) rat model.
• To characterize the metabolic and neurological changes in this model.
• To determine the onset of DPN in relation to T2DM induction.

Main Methods:

• Male Sprague-Dawley rats were fed a high-sucrose/high-fat diet for six weeks to induce insulin resistance.
• Streptozocin (STZ) injection was administered to induce pancreatic injury and T2DM.
• Evaluated metabolic parameters (FBG, OGTT, IPITT) and neurological function (WTL, NCV).

Main Results:

• The combined diet and STZ treatment successfully induced T2DM, evidenced by hyperglycemia, impaired glucose tolerance, and insulin resistance.
• Increased heat sensitivity (reduced WTL) indicated the emergence of early DPN around day 17.
• No significant difference in sciatic nerve conduction velocity (NCV) was observed between early DPN and control groups.

Conclusions:

• A high-sucrose/high-fat diet followed by STZ injection effectively models T2DM with insulin resistance and secretion deficiency in rats.
• Early DPN manifestations, specifically small fiber neuropathy, were detected approximately 17 days post-T2DM induction.
• This model allows for the study of early-stage DPN, differentiating between small and large fiber involvement.