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2017 ; 31
(3
): 321-328
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Functional Roles of Netrin-1 in Osteoblast Differentiation
#MMPMID28438858
Sato T
; Kokabu S
; Enoki Y
; Hayashi N
; Matsumoto M
; Nakahira M
; Sugasawa M
; Yoda T
In Vivo
2017[May]; 31
(3
): 321-328
PMID28438858
show ga
AIM: Recent studies have demonstrated that netrin-1 plays a vital role in bone
metabolism. Previous studies have shown that osteoblasts produce netrin-1 which
affects osteoclast differentiation. However, the role of netrin-1 in osteoblast
differentiation is not well understood. In this study, we explored the roles of
netrin-1 in osteoblasts. MATERIALS AND METHODS: Quantitative
reverse-transcriptase polymerase chain reaction (qPCR), RNA interference for
netrin receptors, the generation of netrin-1 plasmid, transfection of plasmids,
and cell proliferation assay were performed. RESULTS: During osteoblast
differentiation by ascorbic acid, netrin-1 expression was significantly
decreased. Gene expression related with osteoblast differentiation was
down-regulated by netrin-1 treatment. We also found that osteoblast
differentiation by bone morphogenetic protein-4 (BMP-4) was inhibited in the
presence of recombinant netrin-1. Forced expression of both BMP-4 and netrin-1
significantly decreased alkaline phosphatase expression. On the other hand,
Unc5b, neogenin, and A2b which belong to netrin receptors were expressed by
osteoblasts. Moreover, alkaline phosphatase expression was significantly
decreased by knockdown for the combination of two receptors among these
receptors. CONCLUSION: Netrin-1 is involved in the regulation of osteoblast
differentiation.