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- W2152626906 abstract "Airway inflammation is important in asthma pathogenesis. Recent epidemiological data have indicated an association between asthma symptoms in children and exposure to di(2-ethylhexyl) phthalate (DEHP). Thus, we have studied inflammatory responses in primary rat alveolar macrophages (AMs) after exposure to mono(2-ethylhexyl) phthalate (MEHP), the major primary metabolite of DEHP. First, we show that MEHP induces a dose-dependent release of the pro-inflammatory tumour necrosis factor-α (TNF-α) in AMs, giving a maximal (5-fold) increase at 0.7 mM. This concentration also induced some cell death. MEHP also induced phosphorylation of MAPK p38, while the p38 inhibitor SB 202190 reduced MEHP-induced TNF-α, suggesting a p38-dependent cytokine production. Next, we elucidated possible effects of MEHP on the 5-lipoxygenase (5-LO) pathway and found that MEHP caused increased leukotriene (LTB4) release. Further, we found that the 5-LO inhibitor nordihydrogualaretic acid (NDGA) significantly reduced both MEHP-induced TNF-α release and MEHP-induced formation of reactive oxygen species (ROS), supporting an involvement of the 5-LO pathway in MEHP induced inflammatory reactions. Last, we found that MK-886, a known inhibitor of peroxisome proliferator-activated receptor α (PPARα), increased the MEHP-induced TNF-α response. This indicates that MEPH-PPARα binding mediates an anti-inflammatory signal." @default.
- W2152626906 created "2016-06-24" @default.
- W2152626906 creator A5004246712 @default.
- W2152626906 creator A5014466291 @default.
- W2152626906 creator A5015829630 @default.
- W2152626906 creator A5028134530 @default.
- W2152626906 creator A5033189663 @default.
- W2152626906 date "2009-11-25" @default.
- W2152626906 modified "2023-10-18" @default.
- W2152626906 title "Mono(2-ethylhexyl) phthalate induces both pro- and anti-inflammatory responses in rat alveolar macrophages through crosstalk between p38, the lipoxygenase pathway and PPARα" @default.
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