Please use this identifier to cite or link to this item: doi:10.22028/D291-29772
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Title: Mechanical strain mimicking breathing amplifies alterations in gene expression induced by SiO2 NPs in lung epithelial cells
Author(s): Schmitz, Carmen
Welck, Jennifer
Tavernaro, Isabella
Grinberg, Marianna
Rahnenführer, Jörg
Kiemer, Alexandra
van Thriel, Christoph
Hengstler, Jan G.
Kraegeloh, Annette
Language: English
Title: Nanotoxicology
Volume: 13
Issue: 9
Startpage: 1227
Endpage: 1243
Publisher/Platform: Taylor & Francis
Year of Publication: 2019
Publikation type: Journal Article
Abstract: The effects of engineered nanomaterials on human health are still intensively studied in order to facilitate their safe application. However, relatively little is known how mechanical strain as induced in alveolar epithelial cells by breathing movements modifies biological responses to nanoparticles (NPs). In this study, A549 cells as a model for alveolar epithelial cells were exposed to 25 nm amorphous colloidal silica NPs under dynamic and static culture conditions. Gene array data, qPCR, and ELISA revealed an amplified effect of NPs when cells were mechanically stretched in order to model the physiological mechanical deformation during breathing. In contrast, treatment of cells with either strain or NPs alone only led to minor changes in gene expression or interleukin-8 (IL-8) secretion. Confocal microscopy revealed that stretching does not lead to an increased internalization of NPs, indicating that elevated intracellular NP accumulation is not responsible for the observed effect. Gene expression alterations induced by combined exposure to NPs and mechanical strain showed a high similarity to those known to be induced by TNF-α. This study suggests that the inclusion of mechanical strain into in vitro models of the human lung may have a strong influence on the test results.
DOI of the first publication: 10.1080/17435390.2019.1650971
Link to this record: hdl:20.500.11880/28192
ISSN: 1743-5390
Date of registration: 25-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Pharmazie
Professorship: NT - Prof. Dr. Alexandra K. Kiemer
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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