Effects of nanoparticles on murine macrophages

TL;DR

This study investigates how metallic nanoparticles like TiO2 and Cu affect murine macrophages, revealing differential cellular responses and protein expression changes, which are crucial for assessing environmental and health risks.

Contribution

It combines classical and proteomic approaches to characterize macrophage responses to nanoparticles, providing new insights into cellular pathways affected by TiO2 and Cu nanoparticles.

Findings

Differential effects of TiO2 and Cu nanoparticles on macrophage protein expression.

Alterations in pathways such as signal transduction and oxidative stress response.

Validation of proteomics as a tool for nanoparticle impact assessment.

Abstract

Metallic nanoparticles are more and more widely used in an increasing number of applications. Consequently, they are more and more present in the environment, and the risk that they may represent for human health must be evaluated. This requires to increase our knowledge of the cellular responses to nanoparticles. In this context, macrophages appear as an attractive system. They play a major role in eliminating foreign matter, e.g. pathogens or infectious agents, by phagocytosis and inflammatory responses, and are thus highly likely to react to nanoparticles. We have decided to study their responses to nanoparticles by a combination of classical and wide-scope approaches such as proteomics. The long term goal of this study is the better understanding of the responses of macrophages to nanoparticles, and thus to help to assess their possible impact on human health. We chose as a model system bone marrow-derived macrophages and studied the effect of commonly used nanoparticles such as TiO2 and Cu. Classical responses of macrophage were characterized and proteomic approaches based on 2D gels of whole cell extracts were used. Preliminary proteomic data resulting from whole cell extracts showed different effects for TiO2-NPs and Cu-NPs. Modifications of the expression of several proteins involved in different pathways such as, for example, signal transduction, endosome-lysosome pathway, Krebs cycle, oxidative stress response have been underscored. These first results validate our proteomics approach and open a new wide field of investigation for NPs impact on macrophages