Effects of PM10in human peripheral blood monocytes and J774 macrophages

Brown Dm, Donaldson K, Stone, Stone V

Description

The effects of PM 10 , one of the components of particulate air pollution, was investigated using human monocytes and a mouse macrophage cell line (J774). The study aimed to investigate the role of these nanoparticles on the release of the pro-inflammatory cytokine TNF-α and IL-1α gene expression. We also investigated the role of intracellular calcium signalling events and oxidative stress in control of these cytokines and the effect of the particles on the functioning of the cell cytoskeleton. We showed that there was an increase in intracellular calcium concentration in J774 cells on treatment with PM 10 particles which could be significantly reduced with concomitant treatment with the calcium antagonists verapamil, the intracellular calcium chelator BAPTA-AM but not with the antioxidant nacystelyn or the calmodulin inhibitor W-7. In human monocytes, PM 10 stimulated an increase in intracellular calcium which was reduced by verapamil, BAPTA-AM and nacystelyn. TNF-α release was increased with particle treatment in human monocytes and reduced by only verapamil and BAPTA-AM. IL-1α gene expression was increased with particle treatment and reduced by all of the inhibitors. There was increased F-actin staining in J774 cells after treatment with PM 10 particles, which was significantly reduced to control levels with all the antagonists tested. The present study has shown that PM 10 particles may exert their pro-inflammatory effects by modulating intracellular calcium signalling in macrophages leading to expression of pro-inflammatory cytokines. Impaired motility and phagocytic ability as shown by changes in the F-actin cytoskeleton is likely to play a key role in particle clearance from the lung.

Sujets

• Macrophage
• Nanoparticle
• Cytokine
• Cytoskeleton
• PM10

Informations

• Publié par: biomed
• Publié le: 01 janvier 2004
• Nombre de lectures: 6
• Langue: English

Extrait

Pga e 1fo1  ( 2 apegum nr bet nor foaticnoitrup esops)

Introduction and exacerbate respiratory and cardiovascular effects Increased exposure to PM 10 particles is associated with through the induction of oxidative stress and inflamma- adverse health effects [1,2]. Much of the mass of PM 10 is tion [4,6,7]. Rat inhalation studies using nanoparticles of low in toxicity and it has been suggested that, combus- various types, at high exposure, have demonstrated pul- tion-derived nanoparticles (ultrafine particles) [3-5] are a monary fibrosis, lung tumours, epithelial cell hyperplasia, key component that drives these effects, especially inflam- inflammation and increased cytokine expression [8-11]. mation. In individuals with pre-existing lung disease, inhalation of nanoparticles may induce inflammation

Bio Med  Central

Research Open Access Effects of PM 10 in human peripheral blood monocytes and J774 macrophages DM Brown* 1 K Donaldson 2 and V Stone 1 ,

Address: 1 School of Life Sciences, Napier University, Edinburgh, UK and 2 ELEGI Laboratory, Wilk ie Building, University of Edinburgh, UK Email: DM Brown* - [e-mail]; K Donaldson - [e-mail]; V Stone - [e-mail] * Corresponding author 

Respiratory Research

Published: 21 December 2004 Received: 29 September 2004 Respiratory Research 2004, 5 :29 doi:10.1186/1465-9921-5-29  Accepted: 21 December 2004 This article is available from: http:/ /respiratory-research.com/content/5/1/29 © 2004 Brown et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons. org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the orig inal work is properly cited.

MacrophageNanoparticleCytokineCytoskeletonPM 10 Abstract The effects of PM 10 , one of the components of particulate air pollution, was investigated using human monocytes and a mouse macrophage cell line (J774). The study aimed to investigate the role of these nanoparticles on the release of the pro- inflammatory cytokine TNF-α  and IL-1 α  gene expression. We also investigated the role of intracellular calcium signalling events and oxidative stress in control of these cytokine s and the effect of the particles on the functioning of the cell cytoskeleton. We showed that ther e was an increase in intracellu lar calcium concentration in J774 cells on treatment with PM 10 particles which could be significantly reduced with concomitant   treatment with the calcium antago nists verapamil, the intracellula r calcium chelator BAPTA-AM but not with the antioxidant nacystelyn or the ca lmodulin inhibitor W-7. In human monocytes, PM 10 stimulated an increase in intracellular calciu m which was reduced by verapamil, BAPTA-AM and nacystelyn. TNF-α release was increased with particle tr eatment in human monocytes and reduced by only verapamil and BAPTA-AM. IL-1 α gene expression was increased with particle treatment and reduced by all of the inhibitors. There was increased F-actin staining in J774 cells after ment with PM p treat 10 articles, which was significantly reduced to control levels with all the les may antagonists tested. The present study has shown that PM 10 partic exert their pro- inflammatory effects by modulating intracellula r calcium signalling in macrophages leading to expression of pro-inflammatory cytokines. Impaired motility and phagocytic ability as shown by changes in the F-actin cytoskeleton is likely to play a key role in particle clearance from the lung.