BNIP3 regulates AT101 [(-)-gossypol] induced death in malignant peripheral nerve sheath tumor cells.

BNIP3 regulates AT101 [(-)-gossypol] induced death in malignant peripheral nerve sheath tumor cells.
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DOI:
10.1371/journal.pone.0096733
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Roth KA
Roth KA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kaza N;Kohli L;Graham CD;Klocke BJ;Carroll SL;Roth KA

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恶性周围神经鞘瘤(MPNST)是一种侵袭性雪旺细胞来源的肉瘤,是1型神经纤维瘤病(NF1)患者死亡的主要原因。目前的治疗方式在很大程度上无效,导致MPNST复发率高,患者五年存活率低。这就需要为MPNST患者探索可供选择的化疗方案。本研究旨在评估模拟BH3的AT101[(-)-棉酚]对体外培养的MPNST细胞的细胞毒作用,并确定AT101诱导MPNST细胞死亡的关键调控因素。我们发现,AT101导致caspase非依赖的、非凋亡性的MPNST细胞死亡,这种死亡伴随着自噬,并通过HIF-1α诱导非典型的BH3-Only蛋白BNIP3的表达而介导。这些作用是由细胞内铁络合介导的,这是一种以前未报道的AT101细胞毒性机制。
Malignant peripheral nerve sheath tumors (MPNSTs) are aggressive Schwann cell-derived sarcomas and are the leading cause of mortality in patients with neurofibromatosis type 1 (NF1). Current treatment modalities have been largely ineffective, resulting in a high rate of MPNST recurrence and poor five-year patient survival. This necessitates the exploration of alternative chemotherapeutic options for MPNST patients. This study sought to assess the cytotoxic effect of the BH3-mimetic AT101 [(-)-gossypol] on MPNST cells in vitro and to identify key regulators of AT101-induced MPNST cell death. We found that AT101 caused caspase-independent, non-apoptotic MPNST cell death, which was accompanied by autophagy and was mediated through HIF-1α induced expression of the atypical BH3-only protein BNIP3. These effects were mediated by intracellular iron chelation, a previously unreported mechanism of AT101 cytotoxicity.
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