Perineurial abnormalities in the spontaneously diabetic dog

Area of Science:

• Neuroscience
• Veterinary Pathology
• Diabetology

Background:

• Diabetic neuropathy is a common complication of diabetes mellitus.
• The perineurium, a nerve sheath layer, plays a crucial role in nerve protection and function.
• Structural changes in the perineurium may underlie the pathogenesis of diabetic neuropathy.

Purpose of the Study:

• To investigate and quantify structural abnormalities of the perineurium in spontaneously diabetic dogs.
• To compare perineurial morphology between diabetic dogs and healthy controls.

Main Methods:

• Electron microscopic morphometric analysis of superficial peroneal nerve biopsy specimens.
• Quantification of perineurial sheath thickness, lamellar width, number of lamellae, and interlamellar space.
• Measurement of perineurial cell basement membrane thickness.

Main Results:

• Significantly increased total perineurial sheath thickness in diabetic dogs (8.8 µm) compared to controls (6.2 µm).
• Significantly increased mean perineurial lamellar width and total interlamellar space in diabetic dogs.
• Significantly increased perineurial cell basement membrane thickness in diabetic dogs (126.9 nm) compared to controls (62.8 nm).

Conclusions:

• Spontaneously diabetic dogs exhibit significant structural abnormalities of the perineurium.
• These perineurial alterations, including thickened basement membranes and altered lamellar structure, may be implicated in the development of diabetic neuropathy.
• The diabetic dog serves as a relevant model for studying the pathogenesis of diabetic neuropathy.