國家衛生研究院 NHRI:Item 3990099045/7607
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    題名: Crucial role of Toll-like receptors in the zinc/nickel-induced inflammatory response in vascular endothelial cells
    作者: Tsou, TC;Liou, SH;Yeh, SC;Tsai, FY;Chao, HR
    貢獻者: Division of Environmental Health and Occupational Medicine
    摘要: Our previous studies indicated that zinc induced inflammatory response in both vascular endothelial cells and promonocytes. Here, we asked if other metals could cause the similar effect on vascular endothelial cells and tried to determine its underlying mechanism. Following screening of fifteen metals, zinc and nickel were identified with a marked proinflammatory effect, as determined by ICAM-1 and IL-8 induction, on human umbilical vein endothelial cells (HUVECs). Inhibiting protein expression of myeloid differentiation primary response protein-88 (MyD88), a Toll-like receptor (TLR) adaptor acting as a TLR-signaling transducer, significantly attenuated the zinc/nickel-induced inflammatory response, suggesting the critical roles of TLRs in the inflammatory response. Blockage of TLR-4 signaling by CLI-095, a TLR-4 inhibitor, completely inhibited the nickel-induced ICAM-1 and IL-8 expression and NFkappaB activation. The same CLI-095 treatment significantly blocked the zinc-induced IL-8 expression, however with no significant effect on the ICAM-1 expression and a minor inhibitory effect on the NFkappaB activation. The finding demonstrated the differential role of TLR-4 in regulation of the zinc/nickel-induced inflammatory response, where TLR-4 played a dominant role in NFkappaB activation by nickel, but not by zinc. Moreover, inhibition of NFkappaB by adenovirus-mediated IkappaBalpha expression and Bay 11-7025, an inhibitor of cytokine-induced IkappaB-alpha phosphorylation, significantly attenuated the zinc/nickel-induced inflammatory responses, indicating the critical of NFkappaB in the process. The study demonstrates the crucial role of TLRs in the zinc/nickel-induced inflammatory response in vascular endothelial cells and herein deciphers a potential important difference in NFkappaB activation via TLRs. The study provides a molecular basis for linkage between zinc/nickel exposure and pathogenesis of the metal-related inflammatory vascular disease.
    日期: 2013-12
    關聯: Toxicology and Applied Pharmacology. 2013 Dec;273(3):492-499.
    Link to: http://dx.doi.org/10.1016/j.taap.2013.09.014
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0041-008X&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000328711700008
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84888864039
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