Direct binding of Toll-like receptor 4 to ionotropic glutamate receptor N-methyl-D-aspartate subunit 1 induced by lipopolysaccharide in microglial cells N9 and EOC 20

Cui,Jie; Yu,Siyuan; Li,Yihui; Li,Pan; Liu,Feng

doi:10.3892/ijmm.2017.3331

Direct binding of Toll-like receptor 4 to ionotropic glutamate receptor N-methyl-D-aspartate subunit 1 induced by lipopolysaccharide in microglial cells N9 and EOC 20

Authors:
- Jie Cui
- Siyuan Yu
- Yihui Li
- Pan Li
- Feng Liu
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Affiliations: Department of Anesthesiology, Children's Hospital of Chongqing Medical University, Key Laboratory of Child Development and Disorders of The Ministry of Education, Chongqing 400014, P.R. China
Published online on: December 19, 2017 https://doi.org/10.3892/ijmm.2017.3331
Pages: 1323-1330
Copyright: © Cui et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Microglia, the primary immune cells in the brain, are the predominant cells regulating inflammation-mediated neuronal damage. In response to immunological challenges, such as lipopolysaccharide (LPS), microglia are activated and the inflammatory process is subsequently initiated. The aim of the present study was to determine whether LPS induces interactions between the Toll-like receptor 4 (TLR4) and the ionotropic glutamate receptor N-methyl-D‑aspartate subunit 1 (GluN1) in N9 and EOC 20 microglial cells. Immunocytochemistry demonstrated co-localization of TLR4 and GluN1 in response to LPS, and the direct binding of TLR4 and GluN1 was further validated by antibody-based Fluorescence Resonance Energy Transfer technology. Inhibition of the group I metabotropic glutamate receptor 5 with its selective antagonist, MTEP, abolished LPS-induced direct binding of TLR4 to GluN1. Therefore, these data demonstrated that GluN1 and TLR4 act reciprocally in response to LPS in N9 and EOC 20 microglial cells.

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