Epithelial-to-mesenchymal transition in ameloblastoma: focus on morphologically evident mesenchymal phenotypic transition

Siar, Chong Huat and Ng, Kok Han (2019) Epithelial-to-mesenchymal transition in ameloblastoma: focus on morphologically evident mesenchymal phenotypic transition. Pathology, 51 (5). pp. 494-501. ISSN 0031-3025, DOI https://doi.org/10.1016/j.pathol.2019.04.004.

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Official URL: https://doi.org/10.1016/j.pathol.2019.04.004


The ameloblastoma is the most common and clinically significant odontogenic epithelial neoplasm known for its locally-invasive behaviour and high recurrence risk. Epithelial-to-mesenchymal transition (EMT) is a fundamental process whereby epithelial cells lose their epithelial characteristics and gain mesenchymal properties. EMT induction via transcription repression has been investigated in ameloblastoma. However, morphologically evident mesenchymal phenotypic transition remains ill-defined. To determine this, 24 unicystic (UA), 34 solid/multicystic (SA) and 18 recurrent ameloblastoma (RA) were immunohistochemically examined for three EMT-related mesenchymal markers, alpha smooth muscle actin (α-SMA), osteonectin and neuronal cadherin (N-cadherin). All three factors were heterogeneously detected in ameloblastoma samples (α-SMA, n=71/76, 93.4%; osteonectin, n=72/76, 94.7%; N-cadherin, n=24/76, 31.6%). In the tumoural parenchyma, immunoreactive cells were not morphologically distinct from their non-reactive cellular counterparts. Rather, α-SMA and osteonectin predominantly labelled the cytoplasm of central polyhedral > peripheral columnar/cuboidal tumour cells. N-cadherin demonstrated weak-to-moderate circumferential membranous staining in both neoplastic cell types and cytoplasmic expression in spindle-celled epithelium of desmoplastic amelobastoma. For all tumour subsets, α-SMA and osteonectin scored significantly higher in the stroma > parenchyma whilst α-SMA was overexpressed along the tumour invasive front > centre (p<0.05). Stromal N-cadherin scored higher in SA > UA and RA > UA (p<0.05). Other clinicopathological parameters showed no significant associations. Taken together, acquisition of mesenchymal traits without morphologically evident mesenchymal alteration suggests partial EMT in ameloblastoma. Stromal upregulation of these proteins in SA and RA implicates a role in local invasiveness. © 2019 Royal College of Pathologists of Australasia

Item Type: Article
Funders: Malaysia Ministry of Higher Education Fundamental Research Grant FP032-2015A
Uncontrolled Keywords: Solid/multicystic ameloblastoma; unicystic ameloblastoma; recurrent ameloblastoma; immunohistochemistry; epithelial-mesenchymal transition; mesenchymal phenotype
Subjects: R Medicine
R Medicine > RK Dentistry
Divisions: Faculty of Dentistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Jan 2020 01:48
Last Modified: 16 Jan 2020 01:48
URI: http://eprints.um.edu.my/id/eprint/23447

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