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2017 ; 13
(8
): 1082-1091
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Spatiotemporal Expression of Wnt/?-catenin Signaling during Morphogenesis and
Odontogenesis of Deciduous Molar in Miniature Pig
#MMPMID28924388
Wu X
; Li Y
; Wang F
; Hu L
; Li Y
; Wang J
; Zhang C
; Wang S
Int J Biol Sci
2017[]; 13
(8
): 1082-1091
PMID28924388
show ga
The canonical Wnt/?-catenin signaling pathway has been shown to play essential
roles in tooth initiation and early tooth development. However, the role of
Wnt/?-catenin signaling in cusp patterning and crown calcification in large
mammals are largely unknown. In our previous study, miniature pigs were used as
the animal model due to the similarity of tooth anatomy and replacement pattern
between miniature pig and human. Dynamic gene expression of third deciduous molar
(DM3) in miniature pig at early stages was profiled using microarray method and
expression of Wnt genes was significantly correlate with odontogenesis. In the
present study, dynamic expression patterns of Wnt/?-catenin signaling genes of
DM3 at cap, early bell and late bell (secretory) stage were identified. We found
that Lef1 and Axin2 were expressed in the enamel knot and underlying mesenchyme
regions. Meanwhile, Dkk1 was expressed in the peripheral and lower parts of
dental papilla, thus forming the potential Wnt signaling gradient. We also found
that ?-Catenin, Axin2 and Lef1 were expressed strongly in undifferentiated cells
of the inner enamel epithelium (IEE), but weakly in differentiated ameloblasts.
Furthermore, we found that both Wnt signaling read-out gene Lef1 and the
inhibitor Dkk1 were co-expressed in the pre-odontoblasts. In conclusion, the
spatiotemporal distribution and potential gradient of Wnt signaling may
contribute to cusp patterning and crown calcification. These data may yield
insight into future study of precise control of crown morphogenesis and
regeneration in large mammals.