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
期刊:
影响因子:
4.6
通讯作者:
Neumann D
Neumann D
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Haim YO;Unger ND;Souroujon MC;Mittelman M;Neumann D

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糖皮质激素(GC)对免疫系统表现出多效性作用。巨噬细胞是 GC 作用的主要目标。在这里,我们发现地塞米松(DEX)是一种合成GC,可降低幼稚骨髓源性巨噬细胞(BMDM)的活力,涉及细胞凋亡机制。 DEX 与脂多糖 (LPS) 一起给药可保护 BMDM 免受 DEX 介导的细胞死亡,这表明活化的 BMDM 对 DEX 的反应与初始 BMDM 不同。糖皮质激素受体β (GRβ) 的 mRNA 水平增加了 7 倍,从而深入了解 LPS 作用的分子基础。GRβ 是一种 GR 显性失活剪接变体,可抑制 GRα 的转录活性。 LPS 不会抑制所有 DEX 介导的 BMDM 作用; DEX 显着降低了表达高水平细胞表面标志物 F4/80 和 CD11b 的 BMDM 的百分比,并导致巨噬细胞炎症蛋白 1 α (MIP1-α) mRNA 和蛋白水平降低。 LPS 不能阻止这两种 DEX 介导的作用。我们发现 LPS 不会降低 DEX 诱导的糖皮质激素诱导的亮氨酸拉链 (GILZ)(GC 抗炎作用的介质)的升高,这可能提供了潜在的机制。这些发现使我们能够更好地了解临床状态,例如脓毒症,其中巨噬细胞被内毒素激活,并考虑使用 GC 进行治疗。
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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