Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Differential gene expression profiles of periodontal soft tissue from rat teeth after immediate and delayed replantation: a pilot study

  • Chae, Yong Kwon (Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University) ;
  • Shin, Seo Young (Department of Dentistry, Graduate School, Kyung Hee University) ;
  • Kang, Sang Wook (Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University) ;
  • Choi, Sung Chul (Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University) ;
  • Nam, Ok Hyung (Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University)
  • Received : 2021.08.13
  • Accepted : 2021.11.03
  • Published : 2022.04.30
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Abstract

Purpose: In dental avulsion, delayed replantation usually has an uncertain prognosis. After tooth replantation, complex inflammatory responses promote a return to periodontal tissue homeostasis. Various types of cytokines are produced in the inflammatory microenvironment, and these cytokines determine the periodontal tissue response. This study aimed to identify the gene expression profiles of replanted teeth and evaluate the functional differences between immediate and delayed replantation. Methods: Maxillary molars from Sprague-Dawley rats were extracted, exposed to a dry environment, and then replanted. The animals were divided into 2 groups according to the extra-oral time: immediate replantation (dry for 5 minutes) and delayed replantation (dry for 60 minutes). Either 3 or 7 days after replantation, the animals were sacrificed. Periodontal soft tissues were harvested for mRNA sequencing. Hallmark gene set enrichment analysis was performed to predict the function of gene-gene interactions. The normalized enrichment score (NES) was calculated to determine functional differences. Results: The hallmark gene sets enriched in delayed replantation at 3 days were oxidative phosphorylation (NES=2.82, Q<0.001) and tumor necrosis factor-alpha (TNF-α) signaling via the nuclear factor kappa light chain enhancer of activated B cells (NF-κB) pathway (NES=1.52, Q=0.034). At 7 days after delayed replantation, TNF-α signaling via the NF-κB pathway (NES=-1.82, Q=0.002), angiogenesis (NES=-1.66, Q=0.01), and the transforming growth factor-beta signaling pathway (NES=-1.46, Q=0.051) were negatively highlighted. Conclusions: Differentially expressed gene profiles were significantly different between immediate and delayed replantation. TNF-α signaling via the NF-κB pathway was marked during the healing process. However, the enrichment score of this pathway changed in a time-dependent manner between immediate and delayed replantation.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1C1C1006937).

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