Can cadmium deplete glutathione and drive oxidative stress, mitochondrial dysfunction, endothelial injury, and inflammation?

Cadmium is a non-redox-active metal, yet the overall claim is well supported: it can disrupt cellular antioxidant defenses and mitochondrial bioenergetics, creating conditions that favor vascular endothelial activation/injury and inflammatory signaling. Evidence is strongest for oxidative stress and mitochondrial dysfunction; human evidence for vascular effects is supportive but mainly observational.

Antioxidant and mitochondrial effects

• Cadmium can bind glutathione thiols, form Cd–GSH complexes, and promote oxidation of GSH to GSSG, reducing functional antioxidant capacity. Effects vary with tissue, dose, duration, and compensatory glutathione synthesis.
• It can impair selected antioxidant enzymes rather than uniformly suppressing all of them. Experimental studies found reduced renal glutathione peroxidase after 8 weeks of oral cadmium in mice and reduced hepatic glutathione reductase after 28 days in rats; other enzymes may rise transiently or compensatorily.
• Oxidative stress has high-confidence support. Cadmium-related glutathione/enzyme impairment and mitochondrial electron-transport disruption can increase electron leakage and superoxide production. In nonsmoking blood donors, urinary cadmium was positively associated with urinary 8-oxodG after adjustment for creatinine and cotinine.
• Direct experimental evidence shows mitochondrial depolarization, increased permeability, impaired respiration/ATPase activity, and reduced ATP production in isolated HEK293 mitochondria and mammalian hepatocytes.

Vascular and inflammatory implications

• In endothelial models, cadmium reduces nitric-oxide availability and induces dysfunction/apoptosis, with p38/ERK signaling implicated.
• It activates inflammatory adhesion pathways, including NF-κB-associated ICAM-1 and p38 MAPK/JNK-associated VCAM-1 induction.
• In 489 older women, highest versus lowest urinary-cadmium tertile predicted low ankle–brachial index at 5 years (adjusted OR 2.5, 95% CI 1.1–5.8).

Bottom line

• Cadmium plausibly drives a reinforcing cycle of antioxidant depletion, mitochondrial reactive-oxygen-species generation, endothelial injury, and inflammatory activation. These mechanisms are robust experimentally; human vascular associations are consistent but do not independently prove causality.