Effects of low-dose X-ray irradiation on activated macrophages and their possible signal pathways
Open Access
- 27 October 2017
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 12 (10), e0185854
- https://doi.org/10.1371/journal.pone.0185854
Abstract
Low-dose irradiation (LDI) has been used in clinics to treat human diseases, including chronic inflammation. This study assessed the effects of LDI on the inflammatory response of activated mouse primary peritoneal macrophages, and the underlying signal pathways. Primary peritoneal macrophages were isolated from mice and then incubated with lipopolysaccharide (LPS)-coated Ti microparticles (Ti-positive control) with or without brief exposure to LDI (X-ray, 0.5 Gy) 1 h later (Ti-LDI group) or left untreated in culture medium (Ti-negative control). The macrophages were then subjected to qRT-PCR, Western blot, cell viability CCK-8 assay, and ELISA. qRT-PCR analysis revealed the Ti-LDI group expressed significantly lower levels of IL-1β, IL-6, and TNF-α mRNA than those of the Ti-positive control group, while the ELISA data showed that Ti-LDI group had significantly lower secretion of IL-1β, IL-6, and TNF-α proteins. The most significant reduction associated with LDI was the secretion TNF-α protein, which barely increased from 13 to 25 h after treatment. Western blot data demonstrated that phosphorylation of p65 and ERK was much lower in the Ti-LDI group than in the controls. The data from the current study suggests that LDI of activated mouse macrophages was associated with significantly lower inflammation responses, compared with non-exposed activated macrophages, which was possibly through inhibition of the NF-κB and ERK pathways.Funding Information
- Suzhou science and technology development project (SYS201621)
- Suzhou science and technology development project (SYSD2015084)
- Natural Science Foundation of Jiangsu Province (BK20160340)
This publication has 30 references indexed in Scilit:
- Targeting extracellular signal-regulated kinase (ERK) signaling has therapeutic implications for inflammatory osteolysisBone, 2010
- Cellular responses to DNA double-strand breaks after low-dose γ-irradiationNucleic Acids Research, 2009
- 0.5 Gy Gamma Radiation Suppresses Production of TNF-α through Up-regulation of MKP-1 in Mouse Macrophage RAW264.7 CellsRadiation Research, 2009
- Genotoxic effects of X-rays on keratinized mucosa cells during panoramic dental radiographyDentomaxillofacial Radiology, 2008
- Evaluation of Quantitative Analysis of Cultures from Sonicated Retrieved Orthopedic Implants in Diagnosis of Orthopedic InfectionJournal of Clinical Microbiology, 2008
- Identification of bacteria on the surface of clinically infected and non-infected prosthetic hip joints removed during revision arthroplasties by 16S rRNA gene sequencing and by microbiological cultureArthritis Research & Therapy, 2007
- Low‐dose radiotherapy (LD‐RT) and the modulation of iNOS expression in adjuvant‐induced arthritis in ratsInternational Journal of Radiation Biology, 2003
- Use of volumetric computerized tomography as a primary outcome measure to evaluate drug efficacy in the prevention of peri‐prosthetic osteolysis: A 1‐year clinical pilot of etanercept vs. placeboJournal of Orthopaedic Research, 2003
- The effects of low-dose X-irradiation on the oxidative burst in stimulated macrophagesInternational Journal of Radiation Biology, 2002
- Analysis of Relative Gene Expression Data Using Real-Time Quantitative PCR and the 2−ΔΔCT MethodMethods, 2001