The role of ectopic human chorionic gonadotropin beta subunit in inducing epithelial mesenchymal transition in human keratinocytes and its possible pathways

Conference poster


Wen, S., Li, D., Farshori, Z., Wang, X. and Ghali, L. 2015. The role of ectopic human chorionic gonadotropin beta subunit in inducing epithelial mesenchymal transition in human keratinocytes and its possible pathways. British Pharmacological Society Winder Conference 2014. Queen Elizabeth II Conference Centre London 14 - 17 Dec 2014
TypeConference poster
TitleThe role of ectopic human chorionic gonadotropin beta subunit in inducing epithelial mesenchymal transition in human keratinocytes and its possible pathways
AuthorsWen, S., Li, D., Farshori, Z., Wang, X. and Ghali, L.
Abstract

Background: The process of epithelial-mesenchymal transition (EMT) involves the trans-differentiation of epithelial cells to mesenchymal cells associated with high plasticity. It usually occurs when the cells acquire migratory and invasive characteristics due to the weakening or the loss of cell-cell adhesion. Human chorionic gonadotropin (hCG), a pregnancy hormone, consists of a common α subunit which is shared by three other hormones, thyroid stimulating hormone, luteinizing
hormone and follicular stimulating hormone; and an unique β subunit (hCGβ). Previous studies have demonstrated that hCGβ was expressed by some epithelial origin cancers (1, 2, 3) and therefore it has been postulated as a possible epithelial
cancer biomarker. Other studies have linked the presence hCGβ to the aggressive and invasive behavior of certain cancers and their poor prognosis (3, 4).
Methods: This study was set out to investigate whether hCGβ plays a role in inducing the EMT and to elucidate the possible pathways. Human keratinocytes (HK) were exposed to spent media collected from hCGβ producing cancer cells (ScaBER cells)
for 48 hours before the cells were either fixed for immnuostaining or cells were lysed and protein extracts were collected for western blotting analysis. The expression of epithelial and mesenchymal markers was evaluated by both florescent immunocytochemistry and western blotting techniques.
Results: A trend of up-regulation of mesenchymal markers (Vimentin and β-catenin) and down regulation of epithelial marker (E-cadherin) in these treated HK cells was observed. There was 50% increase in cell number which was positively stained by
anti-Vimentin antibody whilst 16% of the cells have lost E-cadherin expression (100% to 84%) following 48 hours’ exposure to the hCGβ containing media. These findings were in consistence with the results from HK cells that were exposed to recombinant hCGβ (r-hCGβ). It was also observed that the changes in the expressions
of these markers were reduced when a combination of three anti-hCGβ antibodies targeting different hCGβ epitopes was added to the spent media. These results were confirmed by western blotting analysis.
Conclusion: The findings suggest that ectopic hCGβ produced by cancer cells might be involved in EMT associated with the migratory and aggressive behavior of such cancers. Furthermore, the up-regulation of β-catenin also suggests its possible role in
the Wnt pathway which offers an insight into EMT process at a molecular level. This could be valuable point in developing future novel anti hCGβ therapies for such types of cancers.

Research GroupBiomarkers for Cancer group
ConferenceBritish Pharmacological Society Winder Conference 2014
ISSN1741-1157
Publication dates
Print30 Apr 2015
Publication process dates
Deposited06 Apr 2016
Accepted26 Feb 2015
Publisher's version
Web address (URL)http://www.pa2online.org/abstract/abstract.jsp?abid=32558&kw=EMT&author=Wen&cat=-1&period=-1
LanguageEnglish
Book titlee Journal of British Pharmacological Society
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