The NADPH oxidase NOX5 protects against apoptosis in ALK-positive anaplastic large-cell lymphoma cell lines.

The NADPH oxidase NOX5 protects against apoptosis in ALK-positive anaplastic large-cell lymphoma cell lines.
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DOI:
10.1016/j.freeradbiomed.2015.02.027
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发表时间:
2015-07
影响因子:
7.4
通讯作者:
Szanto I
Szanto I
中科院分区:
医学1区
文献类型:
--
作者:
Carnesecchi S;Rougemont AL;Doroshow JH;Nagy M;Mouche S;Gumy-Pause F;Szanto I

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活性氧(ROS)是细胞凋亡和癌变的关键调节剂。 ROS 的重要来源之一是 NADPH 氧化酶(NOX)。同种型 NOX5 在淋巴组织中高表达,但在任何常见的霍奇金或非霍奇金淋巴瘤细胞系中尚未检测到。在多种非淋巴恶性细胞中,NOX5 发挥抗凋亡作用。细胞凋亡抑制是一种罕见类型的淋巴瘤(称为间变性淋巴瘤激酶阳性 (ALK+) 间变性大细胞淋巴瘤 (ALCL))的标志性特征,也是 ALK+ ALCL 肿瘤治疗耐药和复发的主要因素。我们应用 RT-PCR 和蛋白质印迹分析来检测三种 ALK+ ALCL 细胞系(Karpas-299、SR-786、SUP-M2)中的 NOX5 表达。我们使用 FACS 分析并检查 Karpas-299 细胞中的 caspase 3 裂解,通过小干扰 RNA (siRNA) 介导的基因沉默和 NOX5 的化学抑制来研究 NOX5 在细胞凋亡中的作用。我们使用免疫组织化学检测 ALK+ ALCL 儿科肿瘤中的 NOX5。 NOX5 mRNA 在 ALK+ ALCL 细胞中被独特检测到,而其他淋巴瘤类别的细胞系则缺乏 NOX5。在 Karpas-299 细胞中,NOX5 特异性 siRNA 的转染和 NOX5 的化学抑制消除了钙诱导的超氧化物产生并增加了 caspase 3 介导的细胞凋亡。免疫组织化学揭示了儿科 ALK+ ALCL 肿瘤细胞中的局灶性 NOX5 反应性。这些结果表明,NOX5 衍生的 ROS 有助于阻断​​ ALK+ ALCL 细胞系的细胞凋亡,并表明 NOX5 作为潜在的药物靶点,可增强细胞凋亡,从而抑制肿瘤进展并防止对经典治疗方法产生耐药性的儿科 ALK+ ALCL 患者复发。
Reactive oxygen species (ROS) are key modulators of apoptosis and carcinogenesis. One of the important sources of ROS is NADPH oxidases (NOXs). The isoform NOX5 is highly expressed in lymphoid tissues, but it has not been detected in any common Hodgkin or non-Hodgkin lymphoma cell lines. In diverse, nonlymphoid malignant cells NOX5 exerts an antiapoptotic effect. Apoptosis suppression is the hallmark feature of a rare type of lymphoma, termed anaplastic lymphoma kinase-positive (ALK+) anaplastic large-cell lymphoma (ALCL), and a major factor in the therapy resistance and relapse of ALK+ ALCL tumors. We applied RT-PCR and Western blot analysis to detect NOX5 expression in three ALK+ ALCL cell lines (Karpas-299, SR-786, SUP-M2). We investigated the role of NOX5 in apoptosis by small-interfering RNA (siRNA)-mediated gene silencing and chemical inhibition of NOX5 using FACS analysis and examining caspase 3 cleavage in Karpas-299 cells. We used immunohistochemistry to detect NOX5 in ALK+ ALCL pediatric tumors. NOX5 mRNA was uniquely detected in ALK+ ALCL cells, whereas cell lines of other lymphoma classes were devoid of NOX5. Transfection of NOX5-specific siRNA and chemical inhibition of NOX5 abrogated calcium-induced superoxide production and increased caspase 3-mediated apoptosis in Karpas-299 cells. Immunohistochemistry revealed focal NOX5 reactivity in pediatric ALK+ ALCL tumor cells. These results indicate that NOX5-derived ROS contribute to apoptosis blockage in ALK+ ALCL cell lines and suggest NOX5 as a potential pharmaceutical target to enhance apoptosis and thus to suppress tumor progression and prevent relapse in pediatric ALK+ ALCL patients that resist classical therapeutic approaches.
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