The association between lead and cadmium co-exposure and renal dysfunction

Area of Science:

• Environmental Health
• Toxicology
• Nephrology

Background:

• Cadmium (Cd) and lead (Pb) are environmental heavy metals known to cause kidney damage.
• The effects of combined Cd and Pb exposure on renal function, particularly at environmental levels, require further investigation.

Purpose of the Study:

• To investigate the impact of co-exposure to cadmium and lead on renal function in a Chinese population.
• To analyze the association between exposure markers (blood and urine Cd/Pb) and kidney function biomarkers.

Main Methods:

• A study population of 331 subjects from control and polluted areas was assessed.
• Blood and urine levels of cadmium and lead, along with urinary N-acetyl-β-D-glucosaminidase (UNAG) and estimated glomerular filtration rate (eGFR), were measured.
• Statistical analyses, including odds ratios (OR) and confidence intervals (CI), were used to determine associations.

Main Results:

• Polluted areas showed significantly higher Cd and Pb exposure levels and lower eGFR compared to control areas.
• High blood Cd/Pb and urine Cd/Pb levels correlated with elevated UNAG and albuminuria (UALB).
• Co-exposure to Cd and Pb, especially high UCd/UPb, significantly increased the risk of elevated UNAG and decreased eGFR.

Conclusions:

• Both cadmium and lead exposure, individually and in combination, are associated with renal impairment.
• Co-exposure to lead and cadmium appears to propagate renal tubular dysfunction more severely than exposure to either metal alone.