硒与甲状腺

硒是生命必需的一种微量元素.硒在体内最主要的生物活性形式是硒代半胱氨酸,以硒代半胱氨酸为活性中心的蛋白质,称为含硒蛋白.硒主要的生物学作用是抗氧化和抗炎症反应.甲状腺内含有多种含硒蛋白,其中最重要的2种为谷胱甘肽过氧化物酶和脱碘酶,前者是甲状腺组织中重要的抗氧化剂,保护甲状腺细胞免受氧化应激损伤;后者是一组与甲状腺激素代谢相关的酶.硒缺乏与多种甲状腺疾病的发生发展有关.研究表明,低硒可加重自身免疫性甲状腺疾病、增加甲状腺癌发病风险以及促进甲状腺肿的发生发展等.补硒可能具有一定治疗作用,但补硒治疗目前尚不成熟,其有效性、安全性等尚需更多的临床药物研究提供理论依据.

Selenium and thyroid gland

Selenium is one of the essential trace elements for life.Selenium exerts its biologic functions mainly through selenoprotein which is a kind of protein with the selenocysteine as its active region.The beneficial role of selenium is antioxidation and anti-inflammation.There are more than ten kinds of selenoproteins in thyroid tissue,of which the two most important ones are glutathione peroxidases and deiodinases.Glutathione peroxidases in thyroid gland are assumed to be associated with the antioxidant activi...