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Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Aberrant activation of Notch signaling in extrahepatic cholangiocarcinoma: clinicopathological features and therapeutic potential for cancer stem cell-like properties

Authors: Shuichi Aoki, Masamichi Mizuma, Yayoi Takahashi, Yoichi Haji, Ryo Okada, Tomoya Abe, Hideaki Karasawa, Keiichi Tamai, Takaho Okada, Takanori Morikawa, Hiroki Hayashi, Kei Nakagawa, Fuyuhiko Motoi, Takeshi Naitoh, Yu Katayose, Michiaki Unno

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

Little is known about the roles of Notch signaling in cholangiocarcinoma (CC). The expression of hairy and enhancer of split 1 (Hes-1) has not been investigated yet in resected specimens of CC. Notch signaling has been reported to be related to cancer stem cell (CSC) like properties in some malignancies. Our aim is to investigate the participation of Notch signaling in resected specimens of extrahepatic CC (EHCC) and to evaluate the efficacy of CC cells with CSC-like properties by Notch signaling blockade.

Methods

First, the expression of Notch1, 2, 3, 4 and Hes-1 was examined by immunohistochemistry in 132 resected EHCC specimens. The clinicopathological characteristics in the expression of Notch receptors and Hes-1 were investigated. Second, GSI IX, which is a γ-secretase-inhibitor, was used for Notch signaling blockade in the following experiment. Alterations of the subpopulation of CD24+CD44+ cells, which are surface markers of CSCs in EHCC, after exposure with GSI IX, gemcitabine (GEM), and the combination of GSI IX plus GEM were assessed by flow cytometry using the human CC cell lines, RBE, HuCCT1 and TFK-1. Also, anchorage-independent growth and mice tumorigenicity in the cells recovered by regular culture media after GSI IX exposure were assessed.

Results

Notch1, 2, 3, 4 and Hes-1 in the resected EHCC specimens were expressed in 50.0, 56.1, 42.4, 6.1, and 81.8 % of the total cohort, respectively. Notch1 and 3 expressions were associated with poorer histological differentiation (P = 0.008 and 0.053). The patients with the expression of at least any one of Notch1-3 receptors, who were in 80.3 % of the total, exhibited poorer survival (P = 0.050). Similarly, the expression of Hes-1 tended to show poor survival (P = 0.093). In all of the examined CC cell lines, GSI IX treatment significantly diminished the subpopulation of CD24+CD44+ cells. Although GEM monotherapy relatively increased the subpopulation of CD24+CD44+ cells in all lines, GSI IX plus GEM attenuated it. Anchorage-independent growth and mice tumorigenicity were inhibited in GSI IX-pretreated cells in RBE and TFK-1 (P < 0.05).

Conclusion

Aberrant Notch signaling is involved with EHCC. Inhibition of Notch signaling is a novel therapeutic strategy for targeting cells with CSC-like properties.
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Metadata
Title
Aberrant activation of Notch signaling in extrahepatic cholangiocarcinoma: clinicopathological features and therapeutic potential for cancer stem cell-like properties
Authors
Shuichi Aoki
Masamichi Mizuma
Yayoi Takahashi
Yoichi Haji
Ryo Okada
Tomoya Abe
Hideaki Karasawa
Keiichi Tamai
Takaho Okada
Takanori Morikawa
Hiroki Hayashi
Kei Nakagawa
Fuyuhiko Motoi
Takeshi Naitoh
Yu Katayose
Michiaki Unno
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2919-4

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