Does cadmium exposure promote oxidative stress, endothelial dysfunction, and immune dysregulation?

Cadmium is a biologically plausible vascular and immunotoxic exposure. The evidence supports an interconnected pathway from oxidative injury to endothelial activation/dysfunction, altered immune signaling, and increased endothelial permeability, although the most direct human evidence is observational.

Clinical and human evidence

• Cadmium burden is associated with oxidative-damage markers: among nonsmoking Italian blood donors, urinary cadmium correlated with blood 8-oxo-dG after adjustment for smoke exposure (β=1.76, 95% CI 0.10–3.42). Blood cadmium has also been associated with urinary malondialdehyde.
• In women older than 65, urinary cadmium was associated with ICAM-1 and carotid plaque; baseline blood cadmium in 64-year-old women predicted carotid-plaque development/progression. These findings are compatible with endothelial injury, though they do not directly demonstrate impaired flow-mediated dilation.
• In adjusted NHANES analyses, each interquartile-range increase in urinary cadmium was associated with 47.5% higher CRP and lower total white-cell count. Other community data link cadmium biomarkers to higher IL-29 and TNF-α and lower IL-4.

Mechanistic evidence

• Cadmium indirectly generates ROS by binding thiols, depleting glutathione, impairing mitochondrial electron transport, and weakening antioxidant defenses. ROS can reduce nitric-oxide bioavailability, impairing endothelium-dependent vasodilation.
• In endothelial models, cadmium activates NF-κB through IκBα degradation and p65 nuclear translocation. Immune-cell responses, including TNF-α secretion by human monocytes, provide a route to amplified inflammatory signaling.
• Cadmium-associated ROS disrupts VE-cadherin, β-catenin, and ZO-1 localization/phosphorylation, with cytoskeletal remodeling and increased endothelial or blood–brain-barrier permeability. An NO donor attenuated leakiness in experimental systems.

Bottom line

• The claim is supported: cadmium can promote oxidative stress, endothelial dysfunction, immune dysregulation, inflammation, and vascular-barrier weakening. For an older woman, vascular susceptibility may make exposure reduction particularly relevant, but human causal effect sizes and individual risk remain uncertain.