Tiron, a ROS scavenger, protects human lung cancer Calu-6 cells against antimycin A-induced cell death.

Abstract:

:Antimycin A (AMA) inhibits the mitochondrial electron transport between cytochromes b and c. However, the relationship between AMA and lung cancer cells is poorly understood. In this study, we investigated the involvement of reactive oxygen species (ROS) and glutathione (GSH) in AMA-treated lung cancer Calu-6 cell death. Treatment with AMA reduced cell viability in a dose-dependent manner for 72 h. The intracellular ROS levels were decreased in Calu-6 cells treated with low doses of AMA (10, 25 or 50 microM) at 72 h. However, the levels increased in cells treated with a high dose of 100 microM AMA. Levels of O2.- were significantly increased in AMA-treated cells at 72 h. The increases in ROS levels including O2.- in AMA-treated cells were observed within 10 min. Treatment with AMA reduced the intracellular GSH content. SOD activity was up-regulated in AMA-treated Calu-6 cells at 72 h. However, catalase activity was down-regulated by AMA. Treatment with tiron, a ROS scavenger, reduced the intracellular ROS levels, which were associated with a partial reduction of apoptosis. Treatment with exogenous SOD and catalase significantly inhibited loss of the mitochondrial transmembrane potential (DeltaPsim) in AMA-treated Calu-6 cells. In conclusion, our results suggest that the changes of intracellular ROS and GSH affect apoptosis in AMA-treated Calu-6 cells.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Han YH,Park WH

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

253-61

issue

1

eissn

1021-335X

issn

1791-2431

journal_volume

21

pub_type

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