The role of selenium in iodine metabolism in children with goiter

Area of Science:

• Endocrinology
• Nutritional Science
• Environmental Health

Background:

• Investigating selenium-iodine interactions is crucial for understanding thyroid health, especially in populations with environmental exposures.
• Goiter prevalence and thyroid function can be influenced by regional deficiencies in essential micronutrients like selenium and iodine.

Purpose of the Study:

• To examine the relationship between selenium and iodine metabolism in children with goiter from iodine-deficient, sulfur-industry-influenced areas in Poland.
• To compare selenium-iodine interactions in this study group with a control group of children from unaffected regions.

Main Methods:

• Cross-sectional study comparing children with goiter (n=136) in southeastern Poland to a control group (n=38).
• Measured blood selenium (BSe) concentration, plasma glutathione peroxidase activity, plasma thyroid-stimulating hormone (TSH), and plasma free thyroxine (fT(4)).
• Analyzed urinary iodine concentration, age, and body mass index for both groups.

Main Results:

• The study group exhibited significantly lower BSe concentrations and plasma glutathione peroxidase activity compared to the control group.
• No significant differences in plasma TSH or fT(4) were found between the overall study and control groups.
• Within the study group, females in the lower selenium quartiles showed statistically significant differences in fT(4) and TSH compared to those in the upper quartiles (p < 0.05).

Conclusions:

• Selenium deficiency may contribute to altered thyroid hormone levels, particularly in females, within iodine-deficient environments.
• The observed sex-specific hormonal response suggests a complex interplay between selenium, iodine, and sex hormones in thyroid regulation.
• Environmental factors, such as sulfur industry influence, may exacerbate micronutrient deficiencies impacting thyroid health.