Functional Depletion of HSP72 by siRNA and Quercetin Enhances Vorinostat-Induced Apoptosis in an HSP72-Overexpressing Cutaneous T-Cell Lymphoma Cell Line, Hut78.

Functional Depletion of HSP72 by siRNA and Quercetin Enhances Vorinostat-Induced Apoptosis in an HSP72-Overexpressing Cutaneous T-Cell Lymphoma Cell Line, Hut78.
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siRNA和槲皮素对HSP72的功能耗竭增强伏立诺他诱导的HSP72过表达的皮肤T细胞淋巴瘤细胞系Hut 78的凋亡。

DOI:
10.3390/ijms222011258
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发表时间:
2021-10-19
影响因子:
5.6
通讯作者:
Kanekura T
Kanekura T
中科院分区:
生物学2区
文献类型:
--
作者:
Fujii K;Idogawa M;Suzuki N;Iwatsuki K;Kanekura T

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组蛋白去乙酰酶抑制剂(HDACis)是皮肤T细胞淋巴瘤(CTCL)的治疗选择之一,但其疗效有限。我们先前证明,HSP72的过度表达与淋巴瘤细胞对HDACis的化疗耐药有关。本研究的目的是探讨HSP72的功能缺失是否会增强HDACi涡旋器的作用。首先,我们建立了稳定的HSP72基因敲除的CTCL细胞系,并证实了HSP72基因下调对伏立诺抗肿瘤作用的影响。接下来,我们研究了HSP72的抑制剂--栎素对涡旋抑制剂抗肿瘤作用的影响。在所检测的5个CTCL细胞系中,HSP72在Hut78细胞中的表达最高,并且HSP72基因敲除增强了Vorinostat诱导的这些细胞的凋亡。低剂量的槲皮素减少HSP72的表达,增加HDAC活性,并增强涡旋剂诱导的对Hut78细胞增殖的抑制。单次小剂量的槲皮素可诱导G2期细胞停滞,但仅轻微增加亚G1期细胞比例。此外,槲皮素还能显著增强Vorinostat诱导的细胞凋亡、caspase-3、caspase-8和caspase-9的活性以及线粒体膜电位的丧失。HSP72基因敲除增强了HSP72过表达的CTCL细胞的凋亡诱导作用,因此,在临床环境下,槲皮素可能是联合治疗的一个合适的候选药物。
Histone deacetylase inhibitors (HDACis) are one of the therapeutic options for cutaneous T-cell lymphoma (CTCL), but they have limited effects. We previously demonstrated that HSP72 overexpression is associated with chemoresistance to HDACis in lymphoma cells. The purpose of this study was to investigate whether the functional depletion of HSP72 enhances the effect of the HDACi vorinostat. First, we established a stable HSP72-knockdown CTCL cell line and confirmed the influence of HSP72 reduction on the antitumor effects of vorinostat. Next, we studied the effect of quercetin, an inhibitor of HSP72, on the antineoplastic effects of vorinostat. In five CTCL cell lines examined, HSP72 expression was highest in Hut78 cells, and HSP72 knockdown enhanced vorinostat-induced apoptosis in these cells. Low-dose quercetin reduced HSP72 expression, increased HDAC activity, and enhanced vorinostat-induced suppression of Hut78 cell proliferation. A single low dose of quercetin induced G2 arrest and only slightly increased the sub-G1 cell fraction. Quercetin also significantly enhanced vorinostat-induced apoptosis, caspase-3, caspase-8, and caspase-9 activity, and the loss of mitochondrial membrane potential. HSP72 knockdown enhanced vorinostat-induced apoptosis in an HSP72-overexpressing CTCL cell line, and thus, quercetin may be a suitable candidate for combination therapy with vorinostat in clinical settings.
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