Diabetic neuropathy: models, mechanisms and mayhem

Area of Science:

• Neurology
• Endocrinology
• Diabetology

Background:

• Diabetic polyneuropathy is a common complication of diabetes mellitus.
• The underlying causes of diabetic polyneuropathy are not fully understood.
• Existing animal models of diabetes do not accurately replicate human diabetic neuropathy.

Purpose of the Study:

• To review the current understanding of the causes of diabetic polyneuropathy.
• To evaluate the relevance of animal models in studying human diabetic neuropathy.
• To discuss potential mechanisms underlying focal, diffuse sensory, and autonomic polyneuropathies in diabetes.

Main Methods:

• Literature review of studies on diabetic neuropathy in humans and animal models.
• Analysis of evidence for vascular, mechanical, and metabolic factors in neuropathy development.
• Critical evaluation of the validity of proposed pathogenic mechanisms.

Main Results:

• Animal models show peripheral nervous system abnormalities but do not fully mimic human degenerative neuropathy.
• Vascular lesions and mechanical injury are implicated in focal neuropathies.
• Evidence for ischemia, hypoxia, and metabolic factors like sorbitol accumulation in diffuse neuropathies is equivocal.
• Distinguishing primary vascular changes from secondary effects is challenging.

Conclusions:

• The etiology of diabetic polyneuropathy is multifactorial and complex.
• A single unifying explanation for all forms of diabetic neuropathy is unlikely.
• Further research is needed to elucidate the precise mechanisms and guide effective treatment strategies.