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• W2012651444 endingPage "272" @default.
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• W2012651444 abstract "Glucocorticoids (GCs) are essential drugs administered topically or systematically for the treatment of autoimmune skin diseases such as pemphigus. However, a certain proportion of patients does not respond well to GCs. Although studies on the relationship between cytokines and GC insensitivity in local tissues have attracted attention recently, little is known about the underlying mechanism(s) for GC insensitivity in epidermal keratinocytes. Here, we report that tumor necrosis factor (TNF) α reduces GC-induced transactivation of endogenous genes as well as a reporter plasmid which contains GC responsive element (GRE) in human epidermal keratinocyte cells (HaCaT). The GC insensitivity by TNFα was not accompanied by changes in mRNA expressions of GR isoforms (α or β). However, we observed that mitogen-activated protein kinase kinase-1/extracellular signal-regulated kinase (MEK-1/ERK) inhibitors (PD98059 and U0126) significantly sensitized the GC-induced transactivation of anti-inflammatory genes (glucocorticoid-induced leucine zipper (GILZ) and mitogen-activated protein kinase phosphatase (MKP)-1) and FK506 binding protein (FKBP) 51 gene in the presence of TNFα. Additionally, we observed that TNFα reduced prednisolone (PSL)-dependent nuclear translocation of GR, which was restored by pre-treatment of MEK-1 inhibitors. This is the first study demonstrating a role of the MEK-1/ERK cascade in TNFα-mediated GC insensitivity. Our data suggest that overexpression of TNFα leads to topical GC insensitivity by reducing GR nuclear translocation in keratinocytes, and our findings also suggest that inhibiting the MEK-1/ERK cascade may offer a therapeutic potential for increasing GC efficacy in epidermis where sufficient inflammatory suppression is required." @default.
• W2012651444 created "2016-06-24" @default.
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• W2012651444 date "2006-12-01" @default.
• W2012651444 modified "2023-09-27" @default.
• W2012651444 title "Mitogen-activated protein kinase kinase 1/extracellular signal-regulated kinase (MEK-1/ERK) inhibitors sensitize reduced glucocorticoid response mediated by TNFα in human epidermal keratinocytes (HaCaT)" @default.
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• W2012651444 doi "https://doi.org/10.1016/j.bbrc.2006.10.032" @default.
• W2012651444 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17054908" @default.
• W2012651444 hasPublicationYear "2006" @default.
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