title: Vitamin D(3) metabolites induce osteogenic differentiation in human dental pulp and human dental follicle cells.
abstract: Vitamin D(3) metabolites regulate the bone metabolism and 1α,25-dihydroxyvitamin D(3) (1α,25(OH)(2)D(3)) is known to play an important role in teeth mineralization. However, little is known about the potential of vitamin D as an osteogenic inducer in human dental pulp (hDPCs) and dental follicle cells (hDFCs) in vitro. Therefore, we investigated the effects of vitamin D(3) metabolites 1α,25(OH)(2)D(3) and 25-hydroxyvitamin D(3) (25OHD(3)) on proliferation and osteogenic differentiation of hDPCs and hDFCs in vitro. We also examined whether vitamin D(3) metabolic enzymes were regulated in hDFCs and hDPCs. Cell proliferation was decreased by both metabolites in hDPCs and hDFCs. Vitamin D(3) metabolites increased ALP activity and induced mineralization when osteogenic supplements (OS; l-ascorbic acid-2-phosphate+β-glycerophosphate) were added, though the expression of osteocalcin (OC) and osteopontin (OPN) were regulated without the addition of OS. CYP24 and CYP27B1 expressions were upregulated by vitamin D(3) metabolites and 25OHD(3) was converted into 1α,25(OH)(2)D(3) in the culture medium. These results confirm that 1α,25(OH)(2)D(3) (10 and 100 nM) and 25OHD(3) (500 nM) can be used as osteogenic inducers synergistically with osteogenic supplements for differentiation of hDPCs and hDFCs. Furthermore, our findings strengthen our knowledge about the role of hDPCs and hDFCs as vitamin D(3) target cells.
authors: REGEA, Institute for Regenerative Medicine, University of Tampere and Tampere University Hospital, Biokatu-12, 33520 Tampere, Finland. rashi.khanna-jain@regea.fi
authors: Rashi
authors: R
authors: Khanna-Jain
authors: Annukka
authors: A
authors: Vuorinen
authors: George K B
authors: GK
authors: Sándor
authors: Riitta
authors: R
authors: Suuronen
authors: Susanna
authors: S
authors: Miettinen
mesh_terms: D000328:Adult; D000469:Alkaline Phosphatase / Q000378:metabolism; D002112:Calcifediol / Q000378:metabolism; D002113:Calcification, Physiologic; D049109:Cell Proliferation; D002478:Cells, Cultured; D002762:Cholecalciferol / Q000031:analogs & derivatives* / Q000378:metabolism*; D003782:Dental Pulp / Q000166:cytology*; D003795:Dental Sac / Q000166:cytology*; D005786:Gene Expression Regulation; D006801:Humans; D010012:Osteogenesis; D018167:Receptors, Calcitriol / Q000235:genetics; D013250:Steroid Hydroxylases / Q000235:genetics; D065668:Vitamin D3 24-Hydroxylase; D055815:Young Adult
chemical_list: D018167:Receptors, Calcitriol; D002762:Cholecalciferol; D013250:Steroid Hydroxylases; D065668:Vitamin D3 24-Hydroxylase; D000469:Alkaline Phosphatase; D002112:Calcifediol