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PMID |
Sentence |
| 1 |
15194744
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PAR2 activation alters colonic paracellular permeability in mice via IFN-gamma-dependent and -independent pathways.
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15194744
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We further investigated the possible involvement of interferon gamma (IFN-gamma) and calmodulin-dependent activation of myosin light chain kinase (MLCK), and alterations of zonula occludens-1 (ZO-1) localization in PAR(2)-induced responses.
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15194744
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Western blotting showed phosphorylation of mucosal myosin light chain (MLC) expression after both doses of SLIGRL.
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15194744
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Finally, we have shown that direct activation of PAR(2) on enterocytes is responsible for increased permeability and ZO-1 disruption.
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15194744
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The resulting tight junction opening does not depend upon IFN-gamma secretion, while the increased permeability in response to the high dose of PAR(2) agonist involves IFN-gamma secretion.
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22584669
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Cytokines induce tight junction disassembly in airway cells via an EGFR-dependent MAPK/ERK1/2-pathway.
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22584669
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To evaluate in vitro whether pro-inflammatory cytokines involved in the pathogenesis of respiratory disorders could alter TJ organization and epithelial barrier integrity, and to characterize the signal transduction pathway involved Calu-3 airway epithelial cells were exposed to TNF-a, IL-4 and IFN-g to assess changes in: (a) TJ assembly, that is, occludin and zonula occludens (ZO)-1 expression and localization, evaluated by confocal microscopy; (b) apoptotic activity, quantified using terminal transferase deoxyuridine triphosphate nick-end labeling staining; (c) epithelial barrier integrity, detected as transmembrane electrical resistance and expressed as G(T) values; (d) epidermal growth factor receptor (EGFR)-dependent mitogenactivated protein (MAP) kinase (MAPK)/extracellular signal-regulated kinases (ERK)1/2 phosphorylation, assessed by western blotting.
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| 8 |
22584669
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The degree ZO-1 and occludin colocalization was 62±2% in control cultures and significantly decreased in the presence of TNF-a (47±3%), IL-4 (43±1%) and INF-g (35±3%).
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22584669
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G(T) values were, respectively, 1.030±0.0, 1.300±0.04, 1.260±0.020 and 2.220±0.015 (mS/cm²)1000 in control cultures and in those exposed to TNF-a, IFN-g and IL-4.
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| 10 |
22584669
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The involvement of EGFR-dependent MAPK/ERK1/2 signaling pathway in cytokine-induced damage was demonstrated by a significant increase in threonine/tyrosine phosphorylation of ERK1/2, already detectable after 5 min incubation.
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| 11 |
22584669
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All these cytokine-induced changes were markedly prevented when Calu-3 cells were cultured in the presence of an EGFR inhibitor (AG1478, 1 μM) or a MAP kinase inhibitor (U0126, 25 μM).
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| 12 |
22584669
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In conclusion, cytokine-induced epithelial injury includes TJ disassembly and epithelial barrier permeability alteration and involves the EGFR-dependent MAPK/ERK1/2 signaling pathway.
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