Modulation expression of tumor necrosis factor ? in the radiation-induced lung injury by glycyrrhizic acid

Abstract

To evaluate the ability of glycyrrhizic acid (GLA) to reduce the tumor necrosis factor ? (TNF-?), release on messenger ribonucleic acid (mRNA) and protein production in the lungs using GLA in response to irradiation were studied. The animals were divided into four groups: No treatment (NT group), GLA treatment only (GLA group), irradiation only (XRT group), and GLA treatment plus irradiation (GLA/XRT group). Rats were killed at different time points. Real-time reverse transcriptase polymerase chain reaction (RT-PCR) was used to evaluate the mRNA expression of TNF-? in the lungs (compared with non-irradiated lungs). An enzyme-linked immunosorbant assay (ELISA) assay was used to measure the TNF-? protein level. The TNF-? mRNA expression in the lungs of the XRT rats was clearly higher at all-time points compared to the NT rats. The TNF-? mRNA expression in the lungs of the GLA/XRT rats was lower at all-time points compared to the XRT rats. Release of the TNF-? on protein level in the lungs of the XRT rats increased at all-time points compared to the NT rats. In contrast to the XRT rats, the lungs of the GLA/XRT rats revealed a reduction on TNF-? protein level at 6 h after irradiation. This study has clearly showed the immediate down-regulation of the TNF-? mRNA and protein production in the lungs using GLA in response to irradiation.