Odontoblast cell death induces NLRP3 inflammasome‐dependent sterile inflammation and regulates dental pulp cell migration, proliferation and differentiation

Aim To investigate the ability of dead odontoblasts to initiate NLRP3 inflammasome‐dependent sterile inflammation and to explore the effect on dental pulp cell (DPCs) migration, proliferation and odontogenic differentiation. Methods Odontoblast‐like cells were subjected to freezing‐thawing cycles to...

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Published in:	International endodontic journal Vol. 54; no. 6; pp. 941 - 950
Main Authors:	Al Natour, B., Lundy, F. T., Moynah, P. N., About, I., Jeanneau, C., Irwin, C.R., Domberoski, Y., El Karim, I. A.
Format:	Journal Article
Language:	English
Published:	England Wiley Subscription Services, Inc 01-06-2021 Wiley
Subjects:	Alkaline phosphatase Angiogenesis Angiogenin Angiopoietin Caspase Cell Death Cell Differentiation Cell Movement Cell Proliferation Cytokines danger associated molecular patterns Dental Pulp Enzyme-linked immunosorbent assay Freezing Growth factors Humans Inflammasomes Inflammation Interferon Interleukin-1beta Leukocyte migration Life Sciences Macrophages Mineralization Monocyte chemoattractant protein 1 NF-κB protein NLR Family, Pyrin Domain-Containing 3 Protein NLRP3 inflammasome Odontoblasts Phosphatase reparative dentine sterile inflammation Thawing Tumor necrosis factor-α Western blotting sterile inflammation odontoblasts reparative dentine cell death NLRP3 inflammasome danger associated molecular patterns
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Summary:	Aim To investigate the ability of dead odontoblasts to initiate NLRP3 inflammasome‐dependent sterile inflammation and to explore the effect on dental pulp cell (DPCs) migration, proliferation and odontogenic differentiation. Methods Odontoblast‐like cells were subjected to freezing‐thawing cycles to produce odontoblast necrotic cell lysate (ONCL). DPCs were treated with ONCL to assess proliferation and migration. THP‐1 differentiated macrophages stimulated with ONCL and live cell imaging and western blotting were used to assess NLRP3 inflammasome activation. Cytokines were measured with multiplex arrays and ELISA. qPCR, alkaline phosphatase and Alizarin red assays were used to assess odontogenic differentiation of DPCs. Data were analysed using the t‐test or anova followed by a Bonferroni post hoc test with the level of significance set at P ≤ 0.05. Results ONCL induced migration and proliferation of DPCs. Treatment of THP‐1 macrophages with ONCL resulted in the release of the inflammatory cytokines IL‐1β, IL‐6, IL‐8, TNFα, IFN‐γ, CCL2 and angiogenic growth factors, angiogenin and angiopoietin. This inflammatory response was associated with activation of NFκB, p38MAPK and NLRP3 inflammasome. To confirm that ONCL induced inflammatory response is NLRP3 inflammasome‐dependent, treatment with a caspase‐1 inhibitor and a specific NLRP3 inhibitor significantly reduced IL‐1β release in THP‐1 macrophages (P = 0.01 and 0.001). Inflammasome activation product, IL‐1β, induced odontogenic differentiation of DPCS as evident by the increase in odontogenic genes expression DMP‐1, RUNX‐2, DSPP and SPP, alkaline phosphatase activity and mineralization. Conclusion Dead odontoblasts induced NLRP3 inflammasome‐dependent sterile inflammation and activated the migration, proliferation and differentiation of DPCs.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0143-2885 1365-2591
DOI:	10.1111/iej.13483