Functional expression of oxytocin receptors in pulp-dentin complex

Dental pulp-derived stromal cells (DPSCs) are a crucial cell population for maintaining the tissue integrity of the pulp-dentin complex. The oxytocin receptor (OXTR), a member of the G protein-coupled receptor (GPCR) su-perfamily, plays versatile roles in diverse biological contexts. However, the role of OXTR in dental pulp has not yet been fully understood. Here, we demonstrate the biological functions and significance of OXTR in DPSCs through a multidisciplinary approach. Microarray data of 494 GPCR genes revealed high OXTR expression in human DPSCs (hDPSCs). Blocking OXTR activity increased the expression of osteogenic and odontogenic marker genes, promoting hDPSC differentiation. Additionally, we found that OXTR is involved in extracellular matrix (ECM) remodeling through the regulation of the gene expression related to ECM homeostasis. We further demonstrated that these genetic changes are mediated by trascriptional activity of Yes-associated protein (YAP). Based on the results, a preclinical experiment was performed using an animal model, demonstrating that the application of an OXTR inhibitor to damaged pulp induced significant hard tissue formation. These results provide new insight into the oxytocin-OXTR system in the regenerative process of pulp-dentin complex.

Automated summary

Dental pulp-derived stromal cells (DPSCs) are important for maintaining the tissue integrity of the pulp-dentin complex. In this study, we demonstrate the biological functions and significance of the oxytocin receptor (OXTR) in DPSCs. Blocking OXTR activity promotes DPSC differentiation and is involved in extracellular matrix (ECM) remodeling. The genetic changes mediated by OXTR are regulated by the transcriptional activity of Yes-associated protein (YAP). These findings provide new insights into the regenerative process of the pulp-dentin complex.