Home
Resources
Publications
Redox Regulation in Radiation-Induced Cytochrome C Release From Mitochondria of Human Lung Carcinoma A549 Cells

Redox Regulation in Radiation-Induced Cytochrome C Release From Mitochondria of Human Lung Carcinoma A549 Cells

Aki Ogura, Shigeru Oowada, Yasuhiro Kon, Aki Hirayama, Hironobu Yasui, Shunsuke Meike, Saori Kobayashi, Mikinori Kuwabara, Osamu Inanami

Cancer Lett. 2009 May 8;277(1):64-71.

PMID: 19117669

Abstract:

Mitochondria in mammalian cells are well-known to play an important role in the intrinsic pathway of genotoxic-agent-induced apoptosis by releasing cytochrome c into cytosol and to be a major source of reactive oxygen species (ROS). The aim of this study was to examine whether mitochondrial ROS are involved in radiation-induced apoptotic signaling in A549 cells. Post-irradiation treatment with N-acetyl-L-cysteine (NAC) inhibited cytochrome c release from mitochondria but did not affect expression levels of Bcl-2, Bcl-X(L) and Bax, suggesting that late production of ROS triggered cytochrome c release. Experiments using DCFDA (a classical ROS fluorescence probe) and MitoAR (a novel mitochondrial ROS probe) demonstrated that intracellular and mitochondrial ROS were enhanced 6h after X irradiation. Furthermore, the O(2)(-*) production ability of mitochondria isolated from A549 cells was evaluated by ESR spectroscopy combined with a spin-trapping reagent (CYPMPO). When isolated mitochondria were incubated with NADH, succinate and CYPMPO, an ESR spectrum due to CYPMPO-OOH was detected. This NADH/succinate-dependent O(2)(-*) production from mitochondria of irradiated cells was significantly increased in comparison with that of unirradiated cells. These results indicate that ionizing radiation enhances O(2)(-*) production from mitochondria to trigger cytochrome c release in A549 cells.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP934182099	CYPMPO		934182-09-9	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: