The relationship between mercury concentration in human organs and different predictor variables

Area of Science:

• Environmental Health
• Toxicology
• Neuroscience

Background:

• Mercury exposure is a public health concern.
• Dental amalgam is a common source of mercury exposure.
• Understanding mercury distribution and influencing factors in human tissues is crucial.

Purpose of the Study:

• To quantify total mercury concentrations in various human tissues from autopsy samples.
• To investigate the relationship between mercury levels and potential predictors like dental amalgam, age, and alcohol consumption.
• To explore age-related changes in mercury accumulation and excretion.

Main Methods:

• Autopsy tissue samples (occipital cortex, abdominal muscle, pituitary gland, kidney cortex) were collected from the Stockholm population.
• Total mercury content was determined using radiochemical neutron activation analysis.
• Multiple linear regression models were employed to identify predictor variables for mercury concentrations.

Main Results:

• Significant mercury concentrations were found in all analyzed tissues, with the highest in kidney cortex.
• Dental amalgam surfaces correlated positively with mercury levels in occipital cortex, abdominal muscle, and pituitary gland.
• Mercury concentrations increased with age in occipital cortex and abdominal muscle but decreased in kidney cortex.
• Chronic alcohol abuse was associated with lower mercury levels in the occipital cortex.

Conclusions:

• Dental amalgam is a significant source of mercury accumulation in specific human tissues.
• Age influences mercury levels, potentially due to altered excretion capacity or lifestyle factors.
• The inverse relationship between age and kidney mercury warrants further investigation into mercury excretion mechanisms.