Neurotoxicity of cobalt

Area of Science:

• Toxicology
• Neuroscience
• Occupational Health

Background:

• Cobalt is known for toxic effects on multiple organ systems, including the thyroid, heart, and hematopoietic system.
• While cobalt neurotoxicity is documented in isolated cases, it lacks systematic investigation.
• Historical and recent reports link cobalt exposure to neurological deficits such as optic atrophy, deafness, and neuropathy.

Purpose of the Study:

• To consolidate reported cases of cobalt neurotoxicity.
• To identify potential mechanisms underlying cobalt-induced neurological damage.
• To explore factors contributing to individual susceptibility to cobalt neurotoxicity.

Main Methods:

• Systematic review and grouping of clinical cases reporting cobalt neurotoxicity.
• Analysis of exposure routes, including occupational (cobalt powder) and medical (cobalt chloride, metal prostheses).
• Review of neurological manifestations and associated cobalt levels.

Main Results:

• Cobalt exposure is associated with bilateral optic atrophy, retinopathy, sensorineural hearing loss, and sensory-motor polyneuropathy.
• Recent cases link high cobalt levels from metal prostheses to tinnitus, deafness, vertigo, visual disturbances, tremor, and neuropathy.
• The findings highlight a pattern of neurotoxicity across different exposure scenarios.

Conclusions:

• Cobalt neurotoxicity is a significant concern, manifesting in various neurological deficits.
• Potential mechanisms may involve altered metal-binding proteins, cellular transport, or genetic predispositions.
• Further research into individual susceptibility is crucial for understanding and preventing cobalt-induced neurological damage.