PMID: 11929496Apr 4, 2002Paper

Increased HLA-DR expression after exposure of human monocytic cells to air particulates

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
A Don Porto CareroG Schoeters

Abstract

The expression of HLA-DR on the cell membrane of antigen-presenting cells is of major importance for the induction of an allergic response in the airways. Environmental particulates are thought to play an important role in inducing or enhancing allergic sensitization, possibly by increasing the expression of HLA-DR on the cell membrane of antigen-presenting cells. In addition, these particulates may synergize with common sensitizing agents in inducing or enhancing HLA-DR and thus antigen presentation. In this study, we investigated the potential of three particle types, namely carbon black, diesel exhaust particles and urban air particulates (0.1-1000 ng/cm(2)), to induce the expression of HLA-DR on differentiated THP-1 cells, taken as a model for alveolar macrophages. We also assessed the "adjuvant" potential of the particles on interferon (IFN)-gamma, a known enhancer of HLA-DR. By themselves, the particles (0.1-1000 ng/cm(2)) were not able to induce HLA-DR on the THP-1 cells after an incubation of 48 h. However, even at very low concentrations, carbon black (from 1 ng/cm(2) on) and diesel exhaust particles (from 0.1 ng/cm(2) on), interacted with IFN-gamma (100 U/mL) to enhance HLA-DR expression (up to 2.5-fold increase). Thi...Continue Reading

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Citations

Feb 4, 2003·Current Allergy and Asthma Reports·David Diaz-SanchezRiccardo Polosa
Mar 30, 2004·Toxicology in Vitro : an International Journal Published in Association with BIBRA·Geert R VerheyenGreet R Schoeters
Dec 21, 2012·Clinical and Translational Gastroenterology·Ludvig LintonMichael Eberhardson
Jul 14, 2009·Drug Safety : an International Journal of Medical Toxicology and Drug Experience·Peter HoetBenoit Nemery

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