Sensitization of acute lymphoblastic leukemia cells for LCL161-induced cell death by targeting redox homeostasis
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- 作者：Christina Haß ; <sup>asup><sup> ; sup><sup>1sup> ; Katharina Belz<sup>asup><sup> ; sup><sup>1sup> ; Hannah Schoeneberger<sup>asup> ; Simone Fulda<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>csup><sup> ; sup><sup>simone.fulda@kgu.de" class="auth_mail" title="E-mail the corresponding authorsup>
- 关键词：ALL ; acute lymphoblastic leukemia ; BHA ; butylated hydroxyanisole ; BSO ; buthionine sulfoximine ; cIAP 1 ; cellular inhibitor of apoptosis 1 ; EV ; empty vector ; γ-GCL ; γ-glutamylcysteine ligase ; GPX ; GSH peroxidase ; GSH ; glutathione ; IAP ; Inhibitor of Apoptosis ; NAC ; N-acetylcysteine ; PBLs ; peripheral blood lymphocytes ; PI ; propidium iodide ; ROS ; reactive oxygen species ; TXN ; thioredoxin ; TXNRD ; thioredoxin reductase ; XIAP ; X-linked inhibitor of apoptosis protein
- 刊名：Biochemical Pharmacology
- 出版年：2016
- 出版时间：1 April 2016
- 年：2016
- 卷：105
- 期：Complete
- 页码：14-22
- 全文大小：568 K
文摘
Disturbed redox homeostasis with both elevated reactive oxygen species (ROS) levels and antioxidant defense mechanisms has been reported in acute lymphoblastic leukemia (ALL). We therefore hypothesized that inhibition of pathways responsible for ROS detoxification renders ALL cells more susceptible for cell death. Here, we report that pharmacological inhibitors of key pathways for the elimination of ROS, i.e. Erastin, buthionine sulfoximine (BSO) and Auranofin, sensitize ALL cells for cell death upon treatment with the Smac mimetic LCL161 that antagonizes Inhibitor of Apoptosis (IAP) proteins. Erastin, BSO or Auranofin significantly increase LCL161-induced cell death and also act in concert with LCL161 to profoundly suppress long-term clonogenic survival in several ALL cell lines. Erastin or BSO cooperates with LCL161 to stimulate ROS production and lipid peroxidation prior to cell death. ROS production and lipid peroxidation are required for this cotreatment-induced cell death, since ROS scavengers or pharmacological inhibition of lipid peroxidation provides significant protection against cell death. These results emphasize that inhibition of antioxidant defense mechanisms can serve as a potent approach to prime ALL cells for LCL161-induced cell death.