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- W2012497440 abstract "Inflammation is considered central in the pathology of health effects from airborne particulate matter (PM). Preexisting inflammatory disorders, such as asthma, but also pulmonary infections, appear to be a risk factor of adverse health effects from PM exposure. Thus, to assess whether and how preexisting inflammation may sensitize lung cells toward additional proinflammatory effects of PM, human bronchial epithelial cells (BEAS-2B) were primed with the highly proinflammatory Toll-like receptor 3 (TLR3) ligand, Poly I:C, prior to exposure with diesel exhaust particles (DEP). DEP-exposure alone induced increased gene-expression of interleukin-6 (IL-6) and CXCL8 (IL-8) but did not affect expression of CCL5 (RANTES), while TLR3-priming alone induced expression of IL-6, CXCL8 and CCL5. DEP-exposure exacerbated IL-6 and CXCL8 responses in TLR3-primed cells, while TLR3-induced CCL5 was suppressed by DEP. TLR3-priming and DEP-exposure resulted in possible additive effects on p38 phosphorylation and IκB-degradation, while DEP rather suppressed ERK and JNK-activation. However, TLR3-priming elicited a considerable increase in p65-phosphorylation at serine 536 which is known to enhance the transcriptional activity of NF-κB. DEP-exposure was unable to induce p65-phosphorylation. Thus TLR3-priming may affect susceptibility toward DEP by activating both shared and complementing pathways required for optimal expression of proinflammatory genes such as IL-6 and CXCL8. The study underscores that primed sick cells may be more susceptible toward effects of particle-exposure and respond both stronger and differently compared to unprimed healthy cells." @default.
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- W2012497440 date "2014-07-01" @default.
- W2012497440 modified "2023-09-24" @default.
- W2012497440 title "Toll like receptor-3 priming alters diesel exhaust particle-induced cytokine responses in human bronchial epithelial cells" @default.
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- W2012497440 doi "https://doi.org/10.1016/j.toxlet.2014.03.021" @default.
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