Selenium is an essential trace mineral that functions as a critical component of selenoproteins, a class of enzymes vital for antioxidant defense and thyroid hormone metabolism throughout the body. Clinically, adequate selenium status is necessary for optimal thyroid function, as it is required for the activity of deiodinase enzymes that convert the inactive T4 hormone into the active T3 hormone. This micronutrient also plays a significant role in immune function and protecting cells from oxidative damage.
Origin
The element was discovered in 1817 by Jöns Jacob Berzelius and named after the Greek goddess of the moon, Selene. Its biological essentiality was recognized much later, establishing its role as a required cofactor in human and animal physiology. The study of endemic deficiency diseases linked its presence to maintaining robust endocrine and immune health.
Mechanism
Selenium is incorporated into amino acids, primarily selenocysteine, which is then integrated into the active sites of selenoproteins, such as the glutathione peroxidases (GPx) and the iodothyronine deiodinases. The GPx enzymes utilize selenium to neutralize harmful reactive oxygen species, thereby reducing cellular oxidative stress and inflammation. The deiodinases rely on selenium to catalyze the precise de-iodination steps necessary for thyroid hormone activation, directly linking the mineral to systemic metabolic regulation.
Lifestyle changes like diet and exercise can significantly improve and, in some cases, reverse subclinical hormonal imbalances, though medical guidance is often necessary.
Nutritional deficiencies dismantle the body's hormonal communication network by depleting the essential building blocks and cofactors required for hormone production and signaling.
Dietary patterns provide the essential micronutrients and energy signals that directly govern the body's conversion of inactive thyroid hormone to its active form.
Dietary interventions support thyroid health by providing key minerals for hormone activation and antioxidants to defend against toxicant-induced damage.
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