MicroRNA-132 Negatively Regulates Palmitate-Induced NLRP3 Inflammasome Activation through FOXO3 Down-Regulation in THP-1 Cells.

MicroRNA-132 Negatively Regulates Palmitate-Induced NLRP3 Inflammasome Activation through FOXO3 Down-Regulation in THP-1 Cells.
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DOI:
10.3390/nu9121370
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发表时间:
2017-12-18
期刊:
影响因子:
5.9
通讯作者:
Han SJ
Han SJ
中科院分区:
医学2区
文献类型:
--
作者:
Byeon HE;Jeon JY;Kim HJ;Kim DJ;Lee KW;Kang Y;Han SJ

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饱和脂肪酸被认为可以激活 NLRP3 炎症小体,这是介导白细胞介素 (IL)-1β 和 IL-18 加工的分子平台。然而,miRNA 介导的棕榈酸酯 (PA) 诱导的炎症小体激活调节机制尚不清楚。我们研究了 miR-132 在 THP-1 细胞中 PA 诱导的 NLRP3 炎症小体激活中的作用。为了了解 miR-132 在炎症小体激活中的调节作用,我们在 THP-1 细胞中过度表达或抑制 miR-132,这些细胞响应 PA 刺激而表达 NLRP3 炎症小体。我们分析了 NLRP3、caspase-1 p10、IL-18 和 IL-1β 的 mRNA 和蛋白水平; caspase-1 活性;和IL-1β的分泌。 PA 的存在激活了 NLRP3 炎性体并增加了 miR-132 的表达。 miR-132 的过表达会减少 caspase-1 p10、IL-18 和 IL-1β,而抑制 miR-132 会增强炎症小体的激活。此外,miR-132 调节 FOXO3 的 mRNA 和蛋白表达,FOXO3 是这些细胞中 miR-132 的潜在靶标。小干扰 RNA 抑制 FOXO3 会降低 PA 刺激的 NLRP3 炎性体活性。 FOXO3 的敲低减弱了 miR-132 抑制剂对 NLRP3 炎性体的激活。基于这些发现,我们得出结论,在 THP-1 细胞中,miR-132 通过下调 FOXO3 负向调节 PA 诱导的 NLRP3 炎症小体激活。
Saturated fatty acids were proposed to activate the NLRP3 inflammasome, a molecular platform that mediates the processing of interleukin (IL)-1β and IL-18. However, the mechanisms underlying the miRNA-mediated regulation of palmitate (PA)-induced inflammasome activation are unclear. We examined the role of miR-132 in PA-induced NLRP3 inflammasome activation in THP-1 cells. To understand the regulatory role of miR-132 in inflammasome activation, we either overexpressed or suppressed miR-132 in THP-1 cells that expressed the NLRP3 inflammasome in response to stimulation by PA. We analyzed the mRNA and protein levels of NLRP3, caspase-1 p10, IL-18, and IL-1β; caspase-1 activity; and IL-1β secretion. The presence of PA activated the NLRP3 inflammasome and increased miR-132 expression. Overexpression of miR-132 reduced caspase-1 p10, IL-18, and IL-1β, while the suppression of miR-132 enhanced inflammasome activation. In addition, miR-132 regulated the mRNA and protein expression of FOXO3, which is a potential target of miR-132 in these cells. FOXO3 suppression by small interfering RNA decreased NLRP3 inflammasome activity stimulated by PA. Knockdown of FOXO3 attenuated NLRP3 inflammasome activation by the miR-132 inhibitor. Based on these findings, we conclude that miR-132 negatively regulates PA-induced NLRP3 inflammasome activation through FOXO3 down-regulation in THP-1 cells.
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