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微量元素锌的营养免疫作用研究进展
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摘要
锌是生命必需的微量元素,参与到DNA的复制、转录、细胞的增殖、分化、凋亡与信号传导等方面的功能调控。不仅动物必需锌,微生物包括有害微生物也必需锌。然而,过量的锌由于破坏正常的生理代谢具有细胞毒性。因此,哺乳动物已经进化出了错综复杂的机制来调控自身的锌稳态,从整体、细胞水平维持锌的适宜浓度,机体锌的稳态调控由锌感应器、金属硫蛋白与锌转运蛋白等介导。微生物感染时,宿主通过调控锌吸收、降低血液锌浓度,提高肝脏等组织锌浓度,降低细胞中游离锌浓度,从而隔离锌,限制病原微生物对锌的利用,发挥"营养免疫"作用。中性粒细胞分泌的钙卫蛋白在锌营养免疫作用中发挥重要作用。用沙门氏菌感染肉鸡证实存在锌营养免疫作用。本文将综述最近几年在病原微生物感染时,宿主限制病原微生物入侵的新策略以及病原微生物抵抗宿主锌营养免疫的新对策,为完善锌抗病营养理论提供依据。
引文
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