Organic arsenicals target thioredoxin reductase followed by oxidative stress and mitochondrial dysfunction resulting in apoptosis.

Abstract

Considering the vital role of cellular redox state, more and more researches focus on the design of drugs targeting thioredoxin reductase (TrxR), an important enzyme in maintaining the balance of cellular redox. Here two organic arsenicals, 2-(((4-(1,3,2-dithiarsinan-2-yl) phenyl) imino) methyl) phenol (PIM-PAO-PDT) and N-(4-(1,3,2-dithiarsinan-2-yl) phenyl)-2-hydroxybenzamide (PAM-PAO-PDT), bearing the S-As-S chemical scaffold and different linking groups have been synthesized, and both of them show the better inhibitory activity and selectivity towards HL-60 cells. Importantly, it is illustrated that they can target TrxR selectively and inhibit its activity via the disturbance for Cys83 and Cys88 located in conserved active sites. Afterwards, the cells suffer from the burst of ROS, consumption of antioxidants and high sensitivity for oxidants, which further damage the mitochondria leading to dysfunction including the collapse of membrane potential, ATP level decline, mitochondrial membrane swelling, MPTP opening, Ca2+ and cytochrome c release. Then the mitochondria-dependent apoptosis is triggered by PIM-PAO-PDT and PAM-PAO-PDT, which can also be deterred in the presence of NAC, DTT or LA. Although the organic arsenicals can suppress TrxR activity, the following oxidative stress and mitochondrial dysfunction are the main causes for apoptosis.

• Authors: Xiao-Yang Fan, Yu-Jiao Liu, Kai Chen, Feng-Lei Jiang, Yan-Jun Hu, Dan Liu, Yi Liu, Yu-Shu Ge
• Journal: European journal of medicinal chemistry (Eur J Med Chem) Vol. 143 Pg. 1090-1102 (Jan 01 2018) ISSN: 1768-3254 [Electronic] France
• PMID: 29150332 (Publication Type: Journal Article)
• Copyright: Copyright © 2017 Elsevier Masson SAS. All rights reserved.

Chemical References

• Antineoplastic Agents
• Arsenicals
• Thioredoxin-Disulfide Reductase

Topics

• Antineoplastic Agents (chemical synthesis, chemistry, pharmacology)
• Apoptosis (drug effects)
• Arsenicals (chemical synthesis, chemistry, pharmacology)
• Cell Proliferation (drug effects)
• Dose-Response Relationship, Drug
• Drug Screening Assays, Antitumor
• Humans
• Mitochondria (drug effects, metabolism)
• Molecular Docking Simulation
• Molecular Structure
• Oxidative Stress (drug effects)
• Structure-Activity Relationship
• Thioredoxin-Disulfide Reductase (antagonists & inhibitors, metabolism)
• Tumor Cells, Cultured