Amyotrophic Lateral Sclerosis Patients Show Higher Urinary Levels of Lead and Copper: A Pilot Case-Control Study

Area of Science:

• Neuroscience
• Environmental Health
• Toxicology

Background:

• Amyotrophic Lateral Sclerosis (ALS) is a prevalent neurodegenerative disease impacting motor neurons.
• Sporadic ALS, over 90% of cases, arises from genetic, aging, and environmental interactions.
• Heavy metal exposure is a potential environmental risk factor due to known neurological effects.

Purpose of the Study:

• To compare heavy metal levels in urine of ALS patients versus healthy controls.
• To investigate the association between environmental heavy metal exposure and ALS.
• To assess lead, manganese, selenium, copper, and zinc levels in a defined cohort.

Main Methods:

• Cross-sectional, case-control observational study design.
• 14 ALS patients and 28 healthy controls (HCs) participated.
• Urine samples analyzed for five heavy metals using ICP-MS.

Main Results:

• ALS patients exhibited significantly higher urinary lead (p < 0.001) and copper (p = 0.007) levels.
• A statistically significant subtle increase in manganese concentrations was observed in ALS patients (p = 0.043).
• Urine metal levels reflect recent exposure, relevant to unchanged living environments, diet, or hobbies.

Conclusions:

• This pilot study indicates elevated urinary lead, manganese, and copper in ALS patients.
• Further extensive research is required to confirm these findings.
• The precise role of these heavy metals in ALS pathogenesis needs elucidation.