Abstract:
:The present study aimed to investigate the effect of Dickkopf-related protein 3 (DKK3) on osteogenic differentiation of rat dental follicle cells (DFCs). A PCR array analysis of Wnt pathway activation in DFCs identified genes dysregulated by mineral induction. Among them, DKK3expression levels were decreased, and further experiments were conducted to investigate its role in DFC osteogenesis. By comparing DFCs grown in normal growth and mineral‑induction media for 4 weeks, the present study confirmed that DKK3 was a potential target gene of osteogenesis through reverse transcription-quantitative polymerase chain reaction (RT‑qPCR) and western blotting (WB). A short hairpin RNA (shRNA) was introduced into DFCs using a lentiviral vector to inhibit DKK3 expression. An alkaline phosphatase (ALP) activity assay and Alizarin Red staining were performed to observe the DKK3‑shRNA DFCs. In addition, the osteogenic differentiation of DKK3‑shRNA DFCs was analyzed by RT‑qPCR and WB. In vivo, DKK3‑shRNA DFCs seeded on hydroxyapatite/β-tricalcium phosphate (HA/TCP) scaffolds were transplanted into the subcutaneous tissue of mice with severe combined immunodeficiency, followed by hematoxylin‑eosin and Masson staining. The results confirmed that DKK3 expression was downregulated during mineral induction in rat DFCs. Lentivirus‑mediated expression of DKK3 shRNA in DFCs promoted calcified‑nodule formation, ALP activity and the expression of β‑catenin, runt‑related transcription factor 2 and osteocalcin, compared with control cells. In vivo, the implanted section presented the majority of newly formed osteoid matrices and collagen, with limited space between the HA/TCP scaffolds and matrices. In conclusion, DKK3 expression negatively regulates the osteogenic differentiation of DFCs and, conversely, downregulation of DKK3 may enhance DFC osteogenesis.
journal_name
Mol Med Repjournal_title
Molecular medicine reportsauthors
Zhang X,Du Y,Ling J,Li W,Liao Y,Wei Xdoi
10.3892/mmr.2017.6165subject
Has Abstractpub_date
2017-04-01 00:00:00pages
1673-1681issue
4eissn
1791-2997issn
1791-3004journal_volume
15pub_type
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