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Nuclear Factor Kappa-B Activation by Particles and Fibers
1a Biomedicine Research Group, Napier University, Edinburgh, United Kingdom and Department of Fiber and Particle Toxicology , Medical Institute of Environmental Hygiene at the Heinrich-Heine-University , Dusseldorf , Germany.
Inhalation Toxicology
|September 15, 2015
Summary
Particles and fibers activate nuclear factor kappa-B (NF-kB), a key player in inflammatory lung diseases like fibrosis and COPD. Understanding NF-kB activation pathways is crucial for developing treatments for particle-induced lung disorders.
Area of Science:
- Environmental Health
- Molecular Biology
- Toxicology
Background:
- Particle research increasingly focuses on transcription factor activation in lung disease pathogenesis.
- Abnormal gene expression linked to particle exposure causes fibrosis, cancer, COPD, and asthma.
- Nuclear factor kappa-B (NF-kB) is a critical transcription factor regulating pro-inflammatory genes.
Purpose of the Study:
- To review the effects of various particles and fibers on NF-kB transcriptional activation.
- To identify specific particles and fibers known to activate NF-kB.
- To explore the mechanisms and intracellular pathways involved in particle-induced NF-kB activation.
Main Methods:
- Review of scientific literature on particle-induced NF-kB activation.
- Identification of particles (e.g., asbestos, diesel exhaust) and fibers activating NF-kB.
- Analysis of NF-kB-regulated genes (e.g., TNFα, IL-6, IL-8) upregulated by particle exposure.
- Examination of intracellular mechanisms including reactive oxygen species, arachidonic acid metabolism, and kinase pathways.
Main Results:
- Asbestos, man-made fibers, quartz, ROFA, and DEP activate NF-kB.
- Upregulation of NF-kB-regulated genes like TNFα, MIP-2, IL-6, IL-8, COX-II, and iNOS observed.
- Mechanisms involve reactive oxygen species, lipid peroxidation, frustrated phagocytosis, and specific particle properties (metals, dimensions).
- Intracellular activation pathways include protein kinase C, tyrosine kinase, and calpain.
Conclusions:
- Particles and fibers activate NF-kB, contributing to pro-inflammatory gene expression in lung disorders.
- Multiple mechanisms and intracellular pathways mediate NF-kB activation by particulates.
- Further research is needed to elucidate all pathways and their in vivo significance in lung disease pathogenesis.
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