Metabolomic signatures distinguish extracellular vesicles from osteoclasts and odontoclasts

AIMS

Pathological dental root resorption and alveolar bone loss are often detected only after irreversible damage. Biomarkers in the gingival crevicular fluid or saliva could provide a means for early detection; however, such biomarkers have proven elusive. We hypothesize that a multiomic approach might yield reliable diagnostic signatures for root resorption and alveolar bone loss. Previously, we showed that extracellular vesicles (EVs) from osteoclasts and odontoclasts differ in their protein composition. In this study, we investigated the metabolome of EVs from osteoclasts, odontoclasts and clasts (non-resorbing clastic cells).

MATERIALS AND METHODS

Mouse haematopoietic precursors were cultured on dentine, bone or plastic, in the presence of recombinant RANKL and CSF-1 to trigger differentiation along the clastic line. On Day 7, the cells were fixed and the differentiation state and resorptive status of the clastic cells were confirmed. EVs were isolated from the conditioned media on Day 7 and characterized by nanoparticle tracking and electron microscopy to ensure quality. Global metabolomic profiling was performed using a Thermo Q-Exactive Orbitrap mass spectrometer with a Dionex UHPLC and autosampler.

RESULTS

We identified 978 metabolites in clastic EVs. Of those, 79 are potential biomarkers with Variable Interdependent Parameters scores of 2 or greater. Known metabolites cytidine, isocytosine, thymine, succinate and citrulline were found at statistically higher levels in EVs from odontoclasts compared with osteoclasts.

CONCLUSION

We conclude that numerous metabolites found in odontoclast EVs differ from those in osteoclast EVs, and thus represent potential biomarkers for root resorption and periodontal tissue destruction.

Death related to dental treatment: a systematic review

OBJECTIVE

The aim of this study was to identify factors associated with death in relation to dental care.

STUDY DESIGN

A systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. PubMed, Dental and Oral Sciences Source, Web of Science, and the Cochrane database were searched, and the references of all retrieved articles were analyzed. Studies were included if death had occurred within 90 days of the dental appointment, and if the patient's age, procedure, and information regarding cause or time of death were provided. Factors associated with death were assessed by multivariate analyses and logistic regression.

RESULTS

Fifty-six publications, including retrospective studies and case reports/series that reported 148 fatalities, were analyzed. On average, 2.6 deaths were reported per year. The leading cause of deaths was anesthesia/sedation/medication-related complications (n = 70). Other causes were cardiovascular events (n = 31), infection (n = 19), airway-respiratory complications (n = 18), bleeding (n = 5), and others (n = 5). Age (P < .0001), disease severity (P < .02), disease stability (P < .006), dental provider characteristics (P < .05), level of consciousness/sedation (P < .02), and drug effects (P < .03) had significant associations with death.

CONCLUSIONS

Reports of death were rare; however, specific risk factors associated with dentistry were identified. A better understanding of these factors is important for the development of guidelines that help prevent fatalities in dentistry.