Effects of alpha-lipoic acid on expression of iron transport and storage proteins in BV-2 microglia cells

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• 作者：Ping Chen¹ ; Fei-Mi Li¹ ; Yu-Fu Zhou ; Christopher Qian ; Juan Li ; Li-Rong Jiang ; Zhong-Ming Qian ; ^{qianzhongming@fudan.edu.cn}
• 关键词：Alpha-lipoic acid (ALA) ; Antioxidant properties ; Iron transport proteins ; Ferric ammonium citrate (FAC) ; BV-2 microglia cells
• 刊名：Pharmacological Reports
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：69
• 期：1
• 页码：1-5
• 全文大小：836 K
• 卷排序：69

文摘

The antioxidant properties of alpha-lipoic acid (ALA) are associated with its ability to reduce iron in cells and tissues, which is partly due to its inhibiting effect on iron uptake from transferrin and its promoting effect on iron deposition into ferritin. However, the relevant mechanisms are unknown.MethodsWe therefore investigated the effects of ALA on the expression of transferrin receptor 1 (TfR1), divalent metal transporter 1 (DMT1), ferroportin 1 (Fpn1) and ferritin in BV-2 microglia cells.ResultsWe demonstrated that ALA significantly inhibited DMT1 expression, lowered ferritin-light-chain (Ft-L) and ferritin-heavy-chain (Ft-H) content, and had no effect on TfR1 and Fpn1 in BV-2 microglia cells. This indicated that the inhibiting effect of ALA on DMT1 might be one of the causes of the ALA-induced reduction in cellular transferrin-bound-iron uptake. We also demonstrated that ALA enhanced DMT1 and TfR1 expression in ferric ammonium citrate (FAC)-treated cells. FAC treatment led to a significant increase in Ft-L, Ft-H and Fpn1, and pre-treatment with ALA resulted in a further increase in the contents of Ft-L and Ft-H but not Fpn1 in cells.ConclusionsALA could up-regulate TfR1, DMT1 and ferritin expression when iron is increased outside of the cell, promoting iron deposition into ferritin by increasing cell iron uptake, and then reducing free iron both inside and outside of the cell.