Macrophages and dendritic cells express tight junction proteins and exchange particles in an in vitro model of the human airway wall

Blank, Fabian; Wehrli, Marc; Lehmann, Andrea; Baum, Oliver; Gehr, Peter; von Garnier, Christophe; Rothen-Rutishauser, Barbara M (2011). Macrophages and dendritic cells express tight junction proteins and exchange particles in an in vitro model of the human airway wall. Immunobiology, 216(1-2), pp. 86-95. Amsterdam: Elsevier 10.1016/j.imbio.2010.02.006

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The human airway epithelium serves as structural and functional barrier against inhaled particulate antigen. Previously, we demonstrated in an in vitro epithelial barrier model that monocyte derived dendritic cells (MDDC) and monocyte derived macrophages (MDM) take up particulate antigen by building a trans-epithelial interacting network. Although the epithelial tight junction (TJ) belt was penetrated by processes of MDDC and MDM, the integrity of the epithelium was not affected. These results brought up two main questions: (1) Do MDM and MDDC exchange particles? (2) Are those cells expressing TJ proteins, which are believed to interact with the TJ belt of the epithelium to preserve the epithelial integrity? The expression of TJ and adherens junction (AJ) mRNA and proteins in MDM and MDDC monocultures was determined by RT-PCR, and immunofluorescence, respectively. Particle uptake and exchange was quantified by flow cytometry and laser scanning microscopy in co-cultures of MDM and MDDC exposed to polystyrene particles (1 μm in diameter). MDM and MDDC constantly expressed TJ and AJ mRNA and proteins. Flow cytometry analysis of MDM and MDDC co-cultures showed increased particle uptake in MDDC while MDM lost particles over time. Quantitative analysis revealed significantly higher particle uptake by MDDC in co-cultures of epithelial cells with MDM and MDDC present, compared to co-cultures containing only epithelial cells and MDDC. We conclude from these findings that MDM and MDDC express TJ and AJ proteins which could help to preserve the epithelial integrity during particle uptake and exchange across the lung epithelium.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Gastro-intestinal, Liver and Lung Disorders (DMLL) > Clinic of Pneumology 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy > Functional Anatomy 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy
UniBE Contributor:	Rothen-Rutishauser, Barbara, Baum, Oliver, Gehr, Peter
ISSN:	0171-2985
Publisher:	Elsevier
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:09
Last Modified:	05 Dec 2022 14:00
Publisher DOI:	10.1016/j.imbio.2010.02.006
PubMed ID:	20362352
Web of Science ID:	000286403300011
URI:	https://boris.unibe.ch/id/eprint/1043 (FactScience: 201739)