The levels of HDAC1 and thioredoxin1 are related to the death of mesothelioma cells by suberoylanilide hydroxamic acid

You,Bo  Ra; Park,Woo  Hyun

doi:10.3892/ijo.2016.3402

The levels of HDAC1 and thioredoxin1 are related to the death of mesothelioma cells by suberoylanilide hydroxamic acid

Authors:
- Bo Ra You
- Woo Hyun Park
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Affiliations: Department of Physiology, Medical School, Institute for Medical Sciences, Chonbuk National University, Jeonju 561-180, Republic of Korea
Published online on: February 19, 2016 https://doi.org/10.3892/ijo.2016.3402
Pages: 2197-2204

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Abstract

Mesothelioma is an aggressive tumor which is mainly derived from the pleura of lung. In the present study, we evaluated the anticancer effect of suberoylanilide hydroxamic acid (SAHA), a histone deacetylase (HDAC) inhibitor on human mesothelioma cells in relation to the levels of HDAC1, reactive oxygen species (ROS) and thioredoxin (Trx). While 1 µM SAHA inhibited cell growth in Phi and ROB cells at 24 h, it did not affect the growth in ADA and Mill cells. Notably, the level of HDAC1 was relatively overexpressed among Phi, REN and ROB cells. SAHA induced necrosis and apoptosis, which was accompanied by the cleavages of PARP and caspase-3 in Phi cells. This agent also increased the loss of mitochondrial membrane potential (MMP, ΔΨm) in Phi cells. All the tested caspase inhibitors attenuated apoptosis in SAHA-treated Phi cells whereas HDAC1 siRNA enhanced the apoptotic cell death. SAHA increased intracellular ROS levels including O2•- in Phi cells. N-acetyl cysteine (NAC) and vitamin C (Vit.C) significantly reduced the growth inhibition and death of Phi cells caused by SAHA. This drug decreased the mRNA and protein levels of Trx1 in Phi and ROB cells. Furthermore, Trx1 siRNA increased cell death and O2•- level in SAHA-treated Phi cells. In conclusion, SAHA selectively inhibited the growth of Phi and ROB mesothelioma cells, which showed the higher basal level of HDAC1. SAHA-induced Phi cell death was related to oxidative stress and Trx1 levels.

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