AUTHOR=Cui Yujia , Li Chuwen , Wang Hanyang , Li Lei , Xie Jing , Zhou Xuedong , Zhang Hai , Sun Jianxun 

TITLE=Hemicentin-1 is an essential extracellular matrix component during tooth root formation by promoting mesenchymal cells differentiation

JOURNAL=Frontiers in Cell and Developmental Biology

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2024.1435241

DOI=10.3389/fcell.2024.1435241

ISSN=2296-634X

ABSTRACT=<p><bold>Introduction:</bold> Root dentin formation is an important process in tooth development. We tried to identify potential genes that regulate root dentin formation which could be potentially used for the regeneration and repair of defective or damaged dental roots.</p><p><bold>Methods:</bold> Tissues harvested from the labial and lingual sides of mouse incisors were used for microarray analysis. Gene ontology (GO) analysis of differentially expressed genes indicated the critical role of extracellular matrix in the discrepancy of dentin formation between root and crown, for which hemicentin-1 (<italic>Hmcn1</italic>) was selected as the target gene. Single-cell RNA sequencing analysis the expression pattern of <italic>Hmcn1</italic> at different developmental stages in mouse molars. The spatiotemporal expression of <italic>HMCN1</italic> in mouse incisors and molars was detected by immunohistochemical staining. The functions of HMCN1 in human dental pulp cells, including proliferation, differentiation and migration, were examined in vitro by CCK8 assay, BrdU assay, wound-healing assay, ALP staining and alizarin red staining, respectively.</p><p><bold>Results:</bold> It was showed that <italic>HMCN1</italic> expression was more pronounced in papilla-pulp on the root than crown side in mouse incisors and molars. <italic>In vitro</italic> experiments presented inhibited dentinogenesis and migration after <italic>HMCN1</italic>-knockdown in human dental pulp cells, while there was no significant difference in proliferation between the <italic>HMCN1</italic>-knockdown group and control group.</p><p><bold>Discussion:</bold> These results indicated that <italic>HMCN1</italic> plays an important role in dentinogenesis and migration of pulp cells, contributing to root dentin formation.</p>