Signaling complexity in diabetic neuropathy: a multitargeted perspective on pathogenesis and therapy

Area of Science:

• Neuroscience
• Endocrinology
• Molecular Biology

Background:

• Diabetic neuropathy (DN) is a common complication of diabetes mellitus, causing significant pain and nerve dysfunction.
• Chronic hyperglycemia triggers multifaceted metabolic, inflammatory, and oxidative stress pathways in neurons.

Purpose of the Study:

• To review the complex interplay of metabolic, inflammatory, mitochondrial, and insulin signaling pathways in DN pathogenesis.
• To explore recent therapeutic strategies targeting these interconnected mechanisms.

Main Methods:

• Literature review of preclinical and clinical studies on DN mechanisms and treatments.
• Analysis of the crosstalk between key pathways including polyol, AGE, PKC, hexosamine biosynthetic, NF-κB, MAPK, and insulin signaling.
• Examination of mitochondrial dysfunction, oxidative stress, and related signaling pathways (AMPK, Nrf2).

Main Results:

• Chronic hyperglycemia activates interconnected metabolic (polyol, AGE, PKC, hexosamine), inflammatory (NF-κB, inflammasomes), and oxidative stress pathways.
• Mitochondrial dysfunction and impaired insulin signaling exacerbate neuronal damage and dysfunction.
• Preclinical studies show promise for targeted therapies (e.g., aldose reductase inhibitors, Nrf2 inducers), but clinical translation is limited.

Conclusions:

• DN pathogenesis involves a complex, self-propagating cycle of metabolic stress, inflammation, and neurodegeneration.
• Understanding the intricate crosstalk between these pathways is crucial for developing effective, multi-targeted DN interventions.
• Further research is needed to translate promising preclinical findings into successful clinical treatments for diabetic neuropathy.