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2017 ; 7
(1
): 11283
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Copine-7 binds to the cell surface receptor, nucleolin, and regulates
ciliogenesis and Dspp expression during odontoblast differentiation
#MMPMID28900213
Seo YM
; Park SJ
; Lee HK
; Park JC
Sci Rep
2017[Sep]; 7
(1
): 11283
PMID28900213
show ga
Tooth development is a progressive process regulated by interactions between
epithelial and mesenchymal tissues. Our previous studies showed that copine-7
(Cpne7), a dental epithelium-derived protein, is a signalling molecule that is
secreted by preameloblasts and regulates the differentiation of preodontoblasts
into odontoblasts. However, the mechanisms involved in the translocation of Cpne7
from preameloblasts to preodontoblasts and the functions of Cpne7 during
odontogenesis are poorly understood. Here, we showed that the internalization of
Cpne7 was mediated primarily by caveolae. This process was initiated by Cpne7
binding to the cell surface protein, nucleolin. Treatment with recombinant Cpne7
protein (rCpne7) in human dental pulp cells (hDPCs) caused an increase in the
number of ciliated cells. The expression level of cilium components, Ift88 and
Kif3a, and Dspp were increased by rCpne7. Treatment with Ift88 siRNA in hDPCs and
MDPC-23 cells significantly down-regulated the expression of Dspp, an
odontoblastic differentiation marker gene. Furthermore, the treatment with
nucleolin siRNA in MDPC-23 cells decreased the expression of Dmp1, Dspp, and
cilium components. Our findings suggested that the binding of Cpne7 with its
receptor, nucleolin, has an important function involving Cpne7 internalization
into preodontoblasts and regulation of Dspp expression through ciliogenesis
during odontoblast differentiation.