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CD44v9 Induces Stem Cell-Like Phenotypes in Human Cholangiocarcinoma
Nattawan Suwannakul1, Ning Ma2, Kaoru Midorikawa1
1Department of Environmental and Molecular Medicine, Mie University Graduate School of Medicine, Tsu, Japan.
Frontiers in Cell and Developmental Biology
|June 26, 2020
Summary
CD44 variant 9 (CD44v9) promotes cholangiocarcinoma (CCA) growth by regulating cell proliferation and redox balance. Silencing CD44v9 inhibits CCA tumor growth, migration, and invasion, offering a potential target for cancer therapy.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Previous studies indicated CD44 variant 9 (CD44v9) overexpression in cholangiocarcinoma (CCA) tissues, linked to inflammation-related tumor development.
- The precise role of CD44v9 in cholangiocarcinogenesis remained largely undefined, necessitating further investigation into its mechanisms.
- This study aimed to elucidate the specific functions of CD44v9 in CCA cells to understand its contribution to cancer development.
Purpose of the Study:
- To investigate the role of CD44 variant 9 (CD44v9) in cholangiocarcinoma (CCA) cell proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT).
- To explore the impact of CD44v9 modulation on the redox system and tumor growth in CCA.
- To assess the potential of targeting CD44v9 as a therapeutic strategy for CCA.
Main Methods:
- Expression analysis of CD44v9 and related molecules in normal cholangiocytes (MMNK1) and CCA cells (KKU213) using RT-qPCR and immunofluorescence (IF).
- Functional assays including cell proliferation (MTT), migration/invasion (Transwell), cell cycle analysis (flow cytometry), and in vivo tumor growth (nude mouse xenografts) after CD44v9 silencing via siRNA.
- Assessment of redox system components (SOD3, xCT), EMT markers (E-cadherin, vimentin), and Wnt pathway molecules (Wnt10a, β-catenin).
Main Results:
- CD44v9 was significantly overexpressed in CCA cells compared to normal cholangiocytes, with elevated mRNA levels of variant exons.
- CD44v9 silencing reduced CCA cell proliferation, induced apoptosis and cell cycle arrest, and decreased migration and invasion.
- Downregulation of CD44v9 inhibited tumor growth in vivo, reduced EMT, modulated the redox system, and affected Wnt signaling components.
Conclusions:
- CD44 variant 9 (CD44v9) plays a crucial role in cholangiocarcinoma (CCA) development by regulating cell proliferation and redox balance.
- Silencing CD44v9 effectively suppresses CCA tumor growth, migration, and invasion, partly through inhibiting the epithelial-mesenchymal transition (EMT) process.
- Targeting CD44v9 presents a promising therapeutic avenue for cholangiocarcinoma treatment.
