The role of NF-κB signaling pathway in polyhexamethylene guanidine phosphate induced inflammatory response in mouse macrophage RAW264.7 cells.

Abstract:

:Polyhexamethylene guanidine (PHMG) phosphate is a competitive disinfectant with strong antibacterial activity. However, epidemiologists revealed that inhaled PHMG-phosphate may increase the risk of pulmonary fibrosis associated with inflammation, resulting in the deaths of many people, including infants and pregnant women. In addition, in vitro and in vivo studies reported the inflammatory effects of PHMG-phosphate. Therefore, the aim of the present study was to clarify the inflammatory effects and its mechanism induced by PHMG-phosphate in murine RAW264.7 macrophages. Cell viability, inflammatory cytokine secretion, nuclear factor kappa B (NF-κB) activation, and reactive oxygen species (ROS) generation were investigated in macrophages exposed to PHMG-phosphate. PHMG-phosphate induced dose-dependent cytotoxicity, with LC50 values of 11.15-0.99mg/ml at 6 and 24h, respectively. PHMG-phosphate induced pro-inflammatory cytokines including IL-1β, IL-6, and IL-8. In particular, IL-8 expression was completely inhibited by the NF-κB inhibitor BAY11-7082. In addition, PHMG-phosphate decreased IκB-α protein expression and increased NF-κB-mediated luciferase activity, which was diminished by N-acetyl-l-cystein. However, abundant amounts of ROS were generated in the presence of PHMG-phosphate at high concentrations with a cytotoxic effect. Our results demonstrated that PHMG-phosphate triggered the activation of NF-κB signaling pathway by modulating the degradation of IκB-α. Furthermore, the NF-κB signaling pathway plays a critical role in the inflammatory responses induced by PHMG-phosphate. We assumed that ROS generated by PHMG-phosphate were associated with inflammatory responses as secondary mechanism. In conclusion, we suggest that PHMG-phosphate induces inflammatory responses via NF-κB signaling pathway.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

Kim HR,Shin DY,Chung KH

doi

10.1016/j.toxlet.2015.01.005

subject

Has Abstract

pub_date

2015-03-04 00:00:00

pages

148-55

issue

2

eissn

0378-4274

issn

1879-3169

pii

S0378-4274(15)00010-7

journal_volume

233

pub_type

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