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Precancer: The Beginning and the End of Cancer. Edited by Jules J. Berman, MD, PhD (E-Mail: with G. William Moore, MD, PhD. Jones & Bartlett Publishers: Sudbury, MA, USA, 2009; 186 pp; 42.95$; ISBN: 9780763777845
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Cancers 2009, 1(1), 23-38; doi:10.3390/cancers1010023

N′1,N′3-Dimethyl-N′1,N′3-bis(phenylcarbonothioyl) Propanedihydrazide (Elesclomol) Selectively Kills Cisplatin Resistant Lung Cancer Cells through Reactive Oxygen Species (ROS)

V.A. Medical Center, Hematology/Oncology, Miami, FL 33125, USA
Sylvester Cancer Center, School of Medicine, University of Miami, Miami, FL, 33136, USA
Author to whom correspondence should be addressed.
Received: 11 November 2009 / Revised: 25 November 2009 / Accepted: 8 December 2009 / Published: 16 December 2009
(This article belongs to the Special Issue Oxidative Stress and Cancer)
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Cisplatin is an important chemotherapeutic agent in lung cancer treatment. The mechanism of drug resistance to cisplatin is complex and historically has been difficult to overcome. We report here that cisplatin resistant lung cancer cell lines possess high basal levels of reactive oxygen species (ROS) when compared to normal cells and their parental cell counterparts. These resistant cells also have low thioredoxin (TRX) levels which may be one of the contributory factors to high ROS. N′1,N′3-dimethyl-N′1,N'3-bis(phenylcarbonothioyl) propanedihydrazide (elesclomol), an agent known to increase ROS is selectively toxic to cisplatin-resistant cells, while sparing normal cells and the parental counterpart. The cytotoxic effect of elesclomol in resistant cells is accompanied by further decreases in TRX and glutathione (GSH) antioxidant systems, while opposite results were found in parental cells. The ID50 of elesclomol in cisplatin-resistant cells ranged from 5–10 nM, which is well within clinically achievable ranges. N-Acetylcysteine (NAC), which is known to neutralize ROS, can abolish the cytotoxic effect of elesclomol, suggesting that the cytotoxic effect results from increased ROS. Overall, our data suggest that elesclomol selectively kills cisplatin-resistant tumor cells through increased ROS. This agent may hold potential to overcome cisplatin resistance and should be further explored to treat patients who have failed cisplatin therapy.
Keywords: lung cancer; drug resistant; cisplatin; ROS; elesclomol lung cancer; drug resistant; cisplatin; ROS; elesclomol
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wangpaichitr, M.; Wu, C.; You, M.; Maher, J.C.; Dinh, V.; Feun, L.G.; Savaraj, N. N′1,N′3-Dimethyl-N′1,N′3-bis(phenylcarbonothioyl) Propanedihydrazide (Elesclomol) Selectively Kills Cisplatin Resistant Lung Cancer Cells through Reactive Oxygen Species (ROS). Cancers 2009, 1, 23-38.

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