Abstract:
BACKGROUND:Our previous studies have proved that zinc supplement effectively alleviate depression symptoms in mice, but the mechanisms are still uncertain. Neuroinflammation is considered as an important aspect in pathogenesis of depression. To elucidate the role of zinc on neuroinflammation, in this study, we investigated effects of zinc on lipopolysaccharide (LPS)-induced inflammation in BV2 microglia cells, a kind of innate immune cells in central nervous system. METHODS:BV2 cells were treated by 100 ng/ml LPS to induce inflammatory responses and the effects of zinc sulfate (ZnSO4) addition on LPS-induced inflammation were observed. Besides, through culturing HT-22 hippocampus cells by using medium transferred from zinc-intervened BV2 cells, the protective roles of zinc on hippocampus cells were identified. RESULTS:LPS treatment up-regulated expressions of CD11b, inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX2), tumor necrosis factor α (TNFα) and interleukin-6 (IL-6) and level of reactive oxygen species (ROS). Meaningfully, zinc was capable of blocking ROS generation and reducing expressions of the above inflammatory cytokines at both 10 μM and 30 μM. In addition, it was proved that zinc intervention to BV2 cells could increase the viabilities of hippocampal HT-22 cells cultured by medium of BV2 cells. Furthermore, the zinc-finger protein A20, an anti-inflammation factor, was increased by zinc supplement, while levels of p65, p-IκB and p-p65 were significantly decreased. LIMITATIONS:More compelling proofs were needed to ensure roles of A20 in anti-inflammatory effects of zinc. CONCLUSIONS:The present results suggested that zinc inhibits inflammatory responses mediated by microglia cells via upregulation of zinc-finger A20. It was proposed that this anti-inflammatory action might be underlying mechanism of previously observed anti-depressive effects of zinc.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Hongxia L,Yuxiao T,Zhilei S,Yan S,Yicui Q,Jiamin S,Xin X,Jianxin Y,Fengfeng M,Hui Sdoi
10.1016/j.jad.2019.02.041subject
Has Abstractpub_date
2019-04-15 00:00:00pages
136-142eissn
0165-0327issn
1573-2517pii
S0165-0327(18)32402-9journal_volume
249pub_type
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