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Suppression of cytokine production by glucocorticoids is mediated by MKP-1 in human lung epithelial cells.
Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.] 2017 May
Mitogen-activated protein kinase phosphatase 1 (MKP-1) expression is induced by inflammatory factors and serves as an endogenous p38 MAPK suppressor to limit inflammatory response. Glucocorticoids are very effective anti-inflammatory drugs and they are used for the treatment of many inflammatory diseases, such as asthma and COPD. We investigated the role of MKP-1 in the inhibition of cytokine production by dexamethasone in human A549 bronchial epithelial cells. We found that dexamethasone increased MKP-1 expression, inhibited p38 MAPK phosphorylation, and suppressed TNF and MIP-3α production in A549 cells. Interestingly, the suppression of p38 MAPK phosphorylation and the inhibition of TNF expression by dexamethasone were attenuated in cells, where MKP-1 expression was silenced by siRNA. In conclusion, these data suggest that dexamethasone increases MKP-1 expression and this results in the suppression of p38 MAPK signaling leading to the inhibition of cytokine production in human bronchial epithelial cells. These results point to the role of MKP-1 as an important factor in the therapeutic effects of glucocorticoids in the treatment of inflammatory lung diseases.
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