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Over-expression of nm23-H1 in HeLa cells provides cells with higher resistance to oxidative stress possibly due to raising intracellular p53 and GPX1

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Abstract

Aim: To determine whether the antitumor factor nm23 is related with antioxidation. Methods: Full-length human nm23-H1 was cloned into a mammalian-expressing vector and transiently introduced into HeLa cells. Results: A remarkably low level of reactive oxygen species (ROS) was detected in the cells over-expressing nm23-H1. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and trypan blue assays found that the cells transfected with a nm23-H1-expressing plasmid had higher viability and stronger resistance to oxidative stress. Immunoprecipitation tests revealed that endogenous nm23-H1 formed a protein complex with p53. Furthermore, the intracellular levels of p53 and p53-regulatedgene GPX1 were obviously increased in the cells overexpressing nm23-H1. The downregulation of p53 in the cells overexpressing nm23-H1 resulted in a higher cellular ROS level and lower cell viability. Conclusion: The findings suggest that nm23-H1 may act as a cellular protector against oxidative stress, possibly triggering the p53-related antioxidative pathway.
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Keywords: GPX1; cell viability; nm23-H1; oxidative stress; p53; reactive oxygen species

Document Type: Research Article

Affiliations: 1: School of Medicine, Xi'an Jiao-Tong University, Xi'an 710061, China 2: State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 100052, China

Publication date: 2008-12-01

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