Anticancer drug bortezomib increases interleukin-8 expression in human monocytes.

Anticancer drug bortezomib increases interleukin-8 expression in human monocytes.
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DOI:
10.1016/j.bbrc.2015.03.041
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发表时间:
2015-05-01
影响因子:
3.1
通讯作者:
Vancurova, Ivana
Vancurova, Ivana
中科院分区:
生物学4区
文献类型:
--
作者:
Sanacora, Shannon;Urdinez, Joaquin;Chang, Tzu-Pei;Vancurova, Ivana

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硼替佐米(BZ)是第一个临床批准的蛋白酶体抑制剂,在血液恶性肿瘤患者中显示出显着的抗癌活性。然而,许多患者会复发并产生耐药性;然而,BZ 抗性的分子机制尚未完全了解。我们最近发现,在实体瘤中,BZ 意外地增加了促炎和促血管生成趋化因子白细胞介素 8 (IL-8) 的表达,同时抑制其他 NFκB 调节基因的表达。由于单核细胞和巨噬细胞是 IL-8 的主要产生者,本研究的目的是检验 BZ 增加人类单核细胞和巨噬细胞中 IL-8 表达的假设。在这里,我们发现 BZ 显着增加脂多糖 (LPS) 刺激的 U937 巨噬细胞以及未刺激的 U937 单核细胞和外周血单核细胞中 IL-8 的表达,同时抑制 IL-6、IL-1 和肿瘤坏死因子-α 的表达。此外,我们的结果表明,潜在机制涉及 p38 丝裂原激活蛋白激酶,这是 BZ 诱导 IL-8 表达所必需的。总之,这些数据表明单核细胞和巨噬细胞中 BZ 增加的 IL-8 表达可能代表 BZ 耐药的机制之一,并表明靶向 p38 介导的 IL-8 表达可以增强 BZ 在癌症治疗中的有效性。
Bortezomib (BZ) is the first clinically approved proteasome inhibitor that has shown remarkable anticancer activity in patients with hematological malignancies. However, many patients relapse and develop resistance; yet, the molecular mechanisms of BZ resistance are not fully understood. We have recently shown that in solid tumors, BZ unexpectedly increases expression of the pro-inflammatory and pro-angiogenic chemokine interleukin-8 (IL-8), while it inhibits expression of other NFκB-regulated genes. Since monocytes and macrophages are major producers of IL-8, the goal of this study was to test the hypothesis that BZ increases the IL-8 expression in human monocytes and macrophages. Here, we show that BZ dramatically increases the IL-8 expression in lipopolysaccharide (LPS)-stimulated U937 macrophages as well as in unstimulated U937 monocytes and peripheral blood mononuclear cells, while it inhibits expression of IL-6, IL-1 and tumor necrosis factor-α. In addition, our results show that the underlying mechanisms involve p38 mitogen-activated protein kinase, which is required for the BZ-induced IL-8 expression. Together, these data suggest that the BZ-increased IL-8 expression in monocytes and macrophages may represent one of the mechanisms responsible for the BZ resistance and indicate that targeting the p38-mediated IL-8 expression could enhance the BZ effectiveness in cancer treatment.
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