HDL induces the expression of the M2 macrophage markers arginase 1 and Fizz-1 in a STAT6-dependent process.

HDL induces the expression of the M2 macrophage markers arginase 1 and Fizz-1 in a STAT6-dependent process.
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DOI:
10.1371/journal.pone.0074676
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Fisher EA
Fisher EA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sanson M;Distel E;Fisher EA

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我们的实验室先前已经在小鼠模型中表明,低HDL水平的正常化可以实现动脉粥样硬化斑块的消退。这包括斑块巨噬细胞从促(“M1”)表型状态向抗炎(“M2”)表型状态的转变。HDL是否可以直接导致这种表型变化,如果是这样,信号机制是什么,在本研究中进行了探讨。用HDL处理的小鼠原代巨噬细胞显示M2标志物精氨酸酶-1(Arg-1)和Fizz-1的基因表达增加,这通常由IL-4诱导。HDL能够增强IL-4诱导的Arg-1的变化,并且倾向于对Fizz-1做同样的事情,同时抑制响应于IFNγ的炎症基因的表达。当巨噬细胞来自STAT 6-/-小鼠时,IL-4或HDL的作用被抑制,但抑制剂研究表明IL-4和HDL对JAK亚型的不同利用通过磷酸化激活STAT 6。总的来说,我们的研究结果描述了HDL的一种新功能,即其在需要STAT 6的过程中直接富集巨噬细胞M2、抗炎状态标志物的能力。
Our lab has previously shown in a mouse model that normalization of a low HDL level achieves atherosclerotic plaque regression. This included the shift from a pro (“M1”) to an anti-inflammatory (“M2”) phenotypic state of plaque macrophages. Whether HDL can directly cause this phenotypic change and, if so, what the signaling mechanism is, were explored in the present studies. Murine primary macrophages treated with HDL showed increased gene expression for the M2 markers Arginase-1 (Arg-1) and Fizz-1, which are classically induced by IL-4. HDL was able to potentiate the IL-4-induced changes in Arg-1, and tended to do the same for Fizz-1, while suppressing the expression of inflammatory genes in response to IFNγ. The effects of either IL-4 or HDL were suppressed when macrophages were from STAT6-/- mice, but inhibitor studies suggested differential utilization of JAK isoforms by IL-4 and HDL to activate STAT6 by phosphorylation. Overall, our results describe a new function of HDL, namely its ability to directly enrich macrophages in markers of the M2, anti-inflammatory, state in a process requiring STAT6.
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