Abstract:
:Insulin-like growth factor 1 (IGF-1) plays an important role in the regulation of tooth root development, and stem cells from apical papilla (SCAPs) are responsible for the formation of root pulp and dentin. To date, it remains unclear whether IGF-1 can regulate the function of SCAPs. In this study, SCAPs were isolated and purified from human immature root apex, and stimulated by 100 ng/mL exogenous IGF-1. The effects of IGF-1 on the proliferation and differentiation of SCAPs were subsequently investigated. IGF-1 treated SCAPs presented the morphological and ultrastructural changes. Cell proliferation, alkaline phosphatase (ALP) activity and mineralization capacity of SCAPs were increased by IGF-1. Western blot and quantitative RT-PCR analyses further demonstrated that the expression of osteogenic-related proteins and genes (e.g., alkaline phosphatase, runt-related transcription factor 2, osterix, and osteocalcin) was significantly up-regulated in IGF-1 treated SCAPs, whereas the expression of odontoblast-specific markers (e.g., dentin sialoprotein and dentin sialophosphoprotein) was down-regulated by IGF-1. In vivo results revealed that IGF-1 treated SCAPs mostly gave birth to bone-like tissues while untreated SCAPs mainly generated dentin-pulp complex-like structures after transplantation. The present study revealed that IGF-1 can promote the osteogenic differentiation and osteogenesis capacity of SCAPs, but weaken their odontogenic differentiation and dentinogenesis capability, indicating that IGF-1 treated SCAPs can be used as a potential candidate for bone tissue engineering.
journal_name
Stem Cell Resjournal_title
Stem cell researchauthors
Wang S,Mu J,Fan Z,Yu Y,Yan M,Lei G,Tang C,Wang Z,Zheng Y,Yu J,Zhang Gdoi
10.1016/j.scr.2011.12.005subject
Has Abstractpub_date
2012-05-01 00:00:00pages
346-56issue
3eissn
1873-5061issn
1876-7753pii
S1873-5061(11)00165-6journal_volume
8pub_type
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