Low-dose radiations derived from cone-beam CT induce transient DNA damage and persistent inflammatory reactions in stem cells from deciduous teeth

Research output: Contribution to journalArticle

Authors

  • Virag Piroska
  • Mihaela Hedisu
  • Olga Soritau
  • Mari Perde-Schrepler
  • Ioana Brie
  • Emoke Pall
  • Eva Fischer-Fodor
  • Loredana Bogdan
  • Ondine Lucaciu
  • Niels Belmans
  • Marjan Moreels
  • Benjamin Salmon
  • Reinhilde Jacobs

Institutes & Expert groups

  • UHasselt - Hasselt University, Faculty of Medicine and Life Sciences, Biomedical Research Institute - Belgium
  • UMF - Iuliu Hațieganu University of Medicine and Pharmacy
  • The Oncology Institute - Laboratory of Radiotherapy - Radiobiology and Tumor Biology
  • University of Agricultural Sciences and Veterinary Medicine
  • NSPHMPDB - SNSMPS - National Institute of Public Health - Hygiene Department
  • KUL - Katholieke Universiteit Leuven - Department of Imaging and Pathology

Documents & links

DOI

Abstract

Objectives: Cone-beam CT (CBCT), a radiographic tool for diagnosis, treatment, and follow-up in dental practice, was introduced also in pediatric radiology, especially orthodontics. Such patients subjected to repetitive X-rays examinations may receive substantial levels of radiation doses. Ionizing radiation (IR), a recognized carcinogenic factor causing DNA double-strand breaks (DSBs) could be harmful to undifferentiated cells such as dental pulp stem cells (DPSCs) since inaccurately repaired or unrepaired DSBs may lead to malignant transformation. The H2AX and MRE11 proteins generated following DSBs formation and pro-inflammatory cytokines (CKs) secreted after irradiation are relevant candidates to monitor the cellular responses induced by CBCT. Methods: DPSCs were extracted from human exfoliated deciduous teeth and their phenotype was assessed by immunocytochemistry and flow-cytometry. Cells were exposed to IR doses: 5.4–107.7 mGy, corresponding to 0.5–8 consecutive skull exposures, respectively. H2AX and MRE11 were detected in whole cells, while IL-1α, IL-6, IL-8, TNFα in supernatants, using enzyme-linked immunosorbent assay (ELISA) at different time points after exposure. Results: The phosphorylation level of H2AX in DPSCs increased considerably at 0.5 h after exposure (p <0.001 for 3, 5, 8 skull exposures and p <0.05 for 1 skull exposure, respectively). MRE11 response could only be detected for the highest IR dose (p <0.001) in the same interval. CKs secretion increased upon CBCT exposure according to doses and time. Conclusions: The DPSCs exposure to CBCT induces transient DNA damage and persistent inflammatory reaction in DPSCs drawing the attention on the potential risks of IR exposures and on the importance of dose monitoring in pediatric population.

Details

Original languageEnglish
Article number20170462
Number of pages10
JournalDentomaxillofacial Radiology
Volume47
DOIs
StatePublished - 2 Jul 2018

Keywords

  • Cone beam CT, DNA damage, dental stem cells

ID: 4521084