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Evidence for programmed odontoblast process retraction after dentine exposure in the rat incisor

Lookup NU author(s): Anas Mahdee, Jane Eastham, Professor John Whitworth, Professor James Gillespie

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Abstract

© 2017 Elsevier Ltd Objective To re-examine the morphology and potential functions of odontoblasts in intact rat incisors and after cavity preparation into dentine. Design Intact incisors were fixed, decalcified, snap frozen and sectioned (10 μm), before staining with rhodamine phalloidin or antibodies for cyto-skeletal proteins: vimentin and actin, ion transporter: NaK-ATPase, and dendritic cell marker: OX6. Samples with cavity were processed similarly and stained for actin and vimentin before comparing the lengths of odontoblast processes (OP) at baseline, 3 h and 24 h (n = 5 for each group). Results Actin was expressed through the full length of OP, while vimentin immunoreactivity was not uniform, with 4 distinct regions. OP showed morphological complexity with fine branches emanating within different regions of dentine. Novel actin-positive tree-like OP were identified within predentine which reduced in intensity and length toward the incisal portion of the tooth. Specimens with cavities showed time-dependant pulpal retraction of OP. Conclusions Differences in structural antibody expression suggest functional variations in OP within different regions of dentine. The role of actin positive OP in predentine is not known, but could be related to dentine deposition, cellular stability or sensing mechanisms. Cavity preparation into dentine was followed by programmed retraction of OP which could be controlled either mechanically by the spatial limitation of the OP within dentinal tubules or structurally by the presence of vimentin, in addition to actin, in the mid-dentine.

Publication metadata

Author(s): Mahdee A, Eastham J, Whitworth JM, Gillespie JI

Publication type: Article

Publication status: Published

Journal: Archives of Oral Biology

Year: 2018

Volume: 85

Pages: 130-141

Print publication date: 01/01/2018

Online publication date: 10/10/2017

Acceptance date: 02/10/2017

ISSN (print): 0003-9969

ISSN (electronic): 1879-1506

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.archoralbio.2017.10.001

DOI: 10.1016/j.archoralbio.2017.10.001

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