Effect of fat on human liver selenium concentration

Area of Science:

• Biochemistry
• Toxicology
• Human Physiology

Background:

• Selenium (Se) is an essential trace element crucial for various physiological functions.
• Accurate measurement of Se levels is vital for assessing nutritional status and potential toxicity.
• Liver tissue is a primary site for Se storage and metabolism.

Purpose of the Study:

• To investigate the impact of hepatic fat content on selenium (Se) concentration measurements in human liver samples.
• To determine if fat extraction influences Se concentration analysis in adult and fetal liver tissues.
• To evaluate the reliability of liver Se measurements in individuals with varying fat content.

Main Methods:

• Autopsy liver samples from 94 adult men and 8 fetuses were collected.
• Samples were lyophilized and analyzed for Se concentration before and after fat extraction using hexane/isopropanol.
• Statistical analysis was performed to assess relationships between Se concentration, fat content, and age.

Main Results:

• An inverse exponential relationship was observed between unextracted adult liver Se concentration and liver fat content (R2 = 0.63).
• Se concentration in defatted adult liver tissue (16.8 microM/kg dry wt) was significantly higher than in unextracted tissue (12.1 microM/kg).
• The Se concentration in fetal liver was unaffected by fat extraction, and age-related differences in Se levels were more pronounced in defatted tissue.

Conclusions:

• Hepatic fat acts as a diluting factor, leading to underestimation of selenium status in adults with high liver fat.
• Selenium measurements in unextracted fatty liver tissue may not accurately reflect an individual's true selenium status.
• Fat extraction is recommended for accurate Se concentration assessment in adult liver tissue, particularly in cases of suspected high hepatic fat.