Lead absorption and renal dysfunction in a South African battery factory

Area of Science:

• Occupational Health
• Environmental Toxicology
• Nephrology

Background:

• Industrial lead (Pb) exposure poses significant health risks.
• Assessing renal function in exposed populations requires comprehensive evaluation.

Purpose of the Study:

• To investigate the association between inorganic lead exposure and renal function in South African battery factory workers.
• To evaluate both conventional and novel markers of renal function and integrity in relation to lead exposure.

Main Methods:

• Evaluated renal function using serum creatinine, urea, and urate.
• Assessed urinary markers including N-acetyl-beta-D-glucosaminidase (NAG), retinol binding protein, and microalbuminuria.
• Correlated lead exposure levels (blood Pb, zinc protoporphyrin) with renal function markers.

Main Results:

• A positive exposure-response relationship was observed between lead levels (current and historical blood Pb, ZPP) and serum creatinine and urate.
• No significant association was found between lead exposure and blood pressure.
• Urinary N-acetyl-beta-D-glucosaminidase (NAG) showed a positive association with both current and historical lead exposure.

Conclusions:

• Lead exposure is associated with renal dysfunction in battery factory workers, evident across various exposure levels.
• The observed renal dysfunction is not attributable to elevated blood pressure.
• Findings underscore the cumulative renal burden of lead absorption and the necessity of reducing lead exposure in industrial workers in South Africa.