Resistance of LPS-activated bone marrow derived macrophages to apoptosis mediated by dexamethasone.
Resistance of LPS-activated bone marrow derived macrophages to apoptosis mediated by dexamethasone.
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DOI:
10.1038/srep04323
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发表时间:
2014-03-10
影响因子:
4.6
通讯作者:
Neumann D
中科院分区:
文献类型:
--
作者:
Haim YO;Unger ND;Souroujon MC;Mittelman M;Neumann D
Glucocorticoids (GC) display pleiotropic effects on the immune system. Macrophages are a major target for GC action. Here we show that dexamethasone (DEX), a synthetic GC, decreased viability of naïve bone marrow-derived macrophages (BMDM), involving an apoptotic mechanism. Administration of DEX together with lipopolysaccharide (LPS) protected BMDM against DEX-mediated cell death, suggesting that activated BMDM respond to DEX differently than naïve BMDM. An insight to the molecular basis of LPS actions was provided by a 7 fold increase in mRNA levels of glucocorticoid receptor beta (GRβ), a GR dominant-negative splice variant which inhibits GRα's transcriptional activity. LPS did not inhibit all DEX-mediated effects on BMDM; DEX significantly reduced the percentage of BMDM expressing high levels of the cell surface markers F4/80 and CD11b and led to a decrease in macrophage inflammatory protein 1 alpha (MIP1-α) mRNA and protein levels. These two DEX-mediated effects were not prevented by LPS. Our finding that LPS did not reduce the DEX-induced elevation of glucocorticoid-induced leucine zipper (GILZ), a mediator of GCs anti-inflammatory actions, may provide an underlying mechanism. These findings enable a better understanding of clinical states, such as sepsis, in which macrophages are activated by endotoxins and treatment by GCs is considered.
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影响因子:
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作者:
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通讯作者:
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影响因子:
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DOI:
10.1016/j.bbrc.2013.02.002
发表时间:
2013-03-08
影响因子:
3.1
作者:
Bonin, Camila P.;Baccarin, Raquel Y. A.;Nostell, Katarina;Nahum, Laila A.;Fossum, Caroline;de Camargo, Maristela M.
通讯作者:
de Camargo, Maristela M.