Integrin α3 is overexpressed in glioma stem-like cells and promotes invasion.

Abstract:

BACKGROUND:Glioma stem-like cell (GSC) properties are responsible for gliomagenesis and recurrence. GSCs are invasive but its mechanism remains to be elucidated. Here, we attempted to identify the molecules that promote invasion in GSCs. METHODS:Neurospheres and CD133⁺ cells were collected from glioblastoma (GBM) specimens and glioma cell lines by sphere-formation method and magnetic affinity cell sorting, respectively. Differential expression of gene candidates, its role in invasion and its signaling pathway were evaluated in glioma cell lines. RESULTS:Neurospheres from surgical specimens attached to fibronectin and laminin, the receptors of which belong to the integrin family. Integrin α3 was overexpressed in CD133⁺ cells compared with CD133⁻ cells in all the glioma cell lines (4 out of 4). Immunohistochemistry demonstrated the localisation of integrin α3 in GBM cells, including invading cells, and in the tumour cells around the vessels, which is believed to be a stem cell niche. The expression of integrin α3 was correlated with migration and invasion. The invasion activity of glioma cells was linked to the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2. CONCLUSION:Our results suggest that integrin α3 contributes to the invasive nature of GSCs via ERK1/2, which renders integrin α3 a prime candidate for anti-invasion therapy for GBM.

journal_name

Br J Cancer

authors

Nakada M,Nambu E,Furuyama N,Yoshida Y,Takino T,Hayashi Y,Sato H,Sai Y,Tsuji T,Miyamoto KI,Hirao A,Hamada JI

doi

10.1038/bjc.2013.218

subject

Has Abstract

pub_date

2013-06-25 00:00:00

pages

2516-24

issue

12

eissn

0007-0920

issn

1532-1827

pii

bjc2013218

journal_volume

108

pub_type

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