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Expression and Function of NUMB in Odontogenesis

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Title: Expression and Function of NUMB in Odontogenesis
Author(s): Li, Haitao; Ramachandran, Amsaveni; Gao, Qi; Ravindran, Sriram; Song, Yiqiang; Evans, Carla; George, Anne
Abstract: NUMB is a multifunctional protein implicated to function in self-renewal and differentiation of progenitors in several tissues. To characterize the transcripts and to analyze the expression pattern of NUMB in odontogenesis, we isolated 2 full-length clones for NUMB from mouse dental pulp mRNA. One novel sequence contained 200 bp insertion in the phosphotyrosine binding domain (PTB). Confocal microscopy analysis showed strong NUMB expression in human dental pulp stem cells (hDPSC) and preameloblasts. Western blot analysis indicated that NUMB isoforms were differentially expressed in various dental tissues. Immunohistochemical analysis showed that in postnatal mouse tooth germs, NUMB was differentially expressed in the preameloblasts, odontoblasts, cervical loop region, and in the dental pulp stem cells during development. Interestingly, overexpression of NUMB in HAT-7, a preameloblast cell line, had dramatic antagonizing effects on the protein expression level of activated Notch 1. Further analysis of the Notch signaling pathway showed that NUMB significantly downregulates sonic hedgehog (Shh) expression in preameloblasts. Therefore, we propose that NUMB maintains ameloblast progenitor phenotype at the cervical loop by downregulating the activated Notch1 protein and thereby inhibiting the mRNA expression of Shh.
Issue Date: 2013
Publisher: Hindawi Publishing Corporation
Citation Info: Li, H. T., Ramachandran, A., Gao, Q., Ravindran, S., Song, Y. Q., Evans, C. and George, A. Expression and Function of NUMB in Odontogenesis. Biomed Research International. 2013. DOI: 10.1155/2013/182965
Type: Article
Description: Copyright © 2013 Haitao Li et al.This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This is a copy of an article published in the BioMed Research International © 2013 Hindawi Publishing Corporation
ISSN: 2314-6133
Sponsor: This work is supported by NIH Grant DE 11657, Brodie Endowment Fund, research funding provided by Department of Orthodontics, University of Illinois at Chicago, and the American Association of Orthodontists Foundation (AAOF).
Date Available in INDIGO: 2015-09-21

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