Metal-induced neurotoxicity in a RAGE-expressing C. elegans model

Area of Science:

• Neuroscience
• Toxicology
• Genetics

Background:

• Environmental and occupational metal exposure are significant global health concerns linked to neurotoxicity.
• Receptor for advanced glycation end products (RAGE) is implicated in neurological disorders, especially those involving glucose metabolism.
• The combined impact of metal exposure and RAGE on neuronal health requires further investigation.

Purpose of the Study:

• To investigate the compounding effects of metal exposure (cadmium and manganese) and RAGE expression on dopamine (DA) and serotonin (SER) neurons in C. elegans.
• To evaluate how RAGE expression influences neurodegeneration under hyperglycemic conditions.

Main Methods:

• Generation of novel RAGE-expressing C. elegans with green fluorescent protein (GFP)-tagged DAergic and SERergic neurons.
• Treatment of these worms with cadmium (Cd) or manganese (Mn).
• Exposure of RAGE-expressing worms to high glucose conditions.

Main Results:

• Both cadmium and manganese induced neurodegeneration, with distinct patterns observed between the two metals.
• Neurodegeneration occurred irrespective of RAGE expression, but RAGE presence altered the degeneration process.
• RAGE expression significantly increased neurodegeneration in both DAergic and SERergic neurons.
• RAGE expression worsened neurodegeneration caused by high glucose levels.

Conclusions:

• The co-occurrence of metal exposure and RAGE expression can lead to neurodegeneration.
• RAGE plays a role in exacerbating neurodegeneration, particularly in the context of hyperglycemia.
• This study highlights the complex interplay between environmental toxins, RAGE, and neuronal health.