NHE blockade inhibits chemokine production and NF-κB activation in immunostimulated endothelial cells

Zoltán H. Németh, Edwin A. Deitch, Qi Lu, Csaba Szabó, György Haskó

    Research output: Contribution to journalArticlepeer-review

    60 Scopus citations

    Abstract

    Na+/H+ exchanger (NHE) activation has been documented to contribute to endothelial cell injury caused by inflammatory states. However, the role of NHEs in regulation of the endothelial cell inflammatory response has not been investigated. The present study tested the hypothesis that NHEs contribute to endothelial cell inflammation induced by endotoxin or interleukin (IL)-1β. NHE inhibition using amiloride, 5-(N-ethyl-N-isopropyl)-amiloride, and 5-(N-methyl-N-isobutyl)amiloride as well as the non-amiloride NHE inhibitors cimetidine, clonidine, and harmaline suppressed endotoxin-induced IL-8 and monocyte chemoattractant protein (MCP)-1 production by human umbilical endothelial vein cells (HUVECs). The suppressive effect of amiloride on endotoxin-induced IL-8 production was associated with a decreased accumulation of IL-8 mRNA. NHE inhibitors suppressed both inhibitory (I)κB degradation and nuclear factor (NF)-κB DNA binding, suggesting that a decrease in activation of the IκB-NF-κB system contributed to the suppression of HUVEC inflammatory response by NHE blockade. NHE inhibition decreased also the IL-1β-induced HUVEC inflammatory response, because amiloride suppressed IL-1β-induced E-selectin expression on HUVECs. These results demonstrate that maximal activation of the HUVEC inflammatory response requires a functional NHE.

    Original languageEnglish (US)
    Pages (from-to)C396-C403
    JournalAmerican Journal of Physiology - Cell Physiology
    Volume283
    Issue number2 52-2
    DOIs
    StatePublished - 2002

    Keywords

    • Adhesion molecule
    • Cytokines
    • Inflammation
    • Na/H exchanger
    • Sepsis
    • Transcription factors

    ASJC Scopus subject areas

    • Physiology
    • Cell Biology

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