Whole-genome Gene Expression Profiling Reveals the Major Role of Nitric Oxide in Mediating the Cellular Transcriptional Response to Ionizing Radiation in Normal Human Fibroblasts

Overview

Journal Genomics

Specialty Genetics

Date 2012 Jul 21

PMID 22814268

Citations 4

Authors

Mykyta V Sokolov

Igor G Panyutin

Ronald D Neumann

Affiliations

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Abstract

The indirect biological effects of ionizing radiation (IR) are thought to be mediated largely by reactive oxygen and nitrogen species (ROS and RNS). However, no data are available on how nitric oxide (NO) modulates the response of normal human cells to IR exposures at the level of the whole transcriptome. Here, we examined the effects of NO and ROS scavengers, carboxy-PTIO and DMSO, on changes in global gene expression in cultured normal human fibroblasts after exposures to gamma-rays, aiming to elucidate the involvement of ROS and RNS in transcriptional response to IR. We found that NO depletion dramatically affects the gene expression in normal human cells following irradiation with gamma-rays. We observed striking (more than seven-fold) reduction of the number of upregulated genes upon NO scavenging compared to reference irradiated cell cultures. NO scavenging in irradiated IMR-90 cells results in induction of p53 signaling, DNA damage and DNA repair pathways.

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