Targeting the alpha 1 subunit of the sodium pump to combat glioblastoma cells.

Abstract:

OBJECTIVE:Ion transporters play pivotal roles in cancer cell migration in general and in glioblastomas (GBMs) in particular. However, the specific role of Na/K-ATPase (the sodium pump) and, in particular, its alpha1 subunit, has remained unexplored in GBMs. MATERIALS AND METHODS:The expression of Na+/K+ -ATPase alpha1 in GBM clinical samples, normal brain tissue, and a human GBM cell line has been investigated. Using the novel cardenolide UNBS1450 (Unibioscreen, Brussels, Belgium), which is a ligand of the sodium pump, we have characterized the effects of inhibiting Na+/K+ -ATPase alpha1 in human GBM cells with respect to cell proliferation; morphology; impact on intracellular Na+, Ca2+, and adenosine triphosphate; and changes in the actin cytoskeleton. We have investigated the mechanism by which UNBS1450 overcomes the apoptosis resistance of GBMs and determined its anti-tumor effects in comparative studies in vitro in GBM cell viability assays and in vivo using an orthotopic human GBM xenograft model. RESULTS:Overall, the alpha1 subunit of Na+/K+ -ATPase is highly expressed in a majority of glioblastomas compared with normal brain tissues, and by binding to this subunit in human U373-MG GBM cells, UNBS1450 impairs cell proliferation and migration via an intracellular adenosine triphosphate decrease-mediated disorganization of the actin cytoskeleton and cytotoxic proautophagic effects. UNBS1450 also significantly increases the in vivo survival of mice orthotopically grafted with U373-MG GBM cells. CONCLUSION:Inhibition of the Na+/K+ -ATPase alpha1 subunit in human GBM cells impairs both cell migration and cell proliferation.

journal_name

Neurosurgery

journal_title

Neurosurgery

authors

Lefranc F,Mijatovic T,Kondo Y,Sauvage S,Roland I,Debeir O,Krstic D,Vasic V,Gailly P,Kondo S,Blanco G,Kiss R

doi

10.1227/01.NEU.0000311080.43024.0E

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

211-21; discussion 221-2

issue

1

eissn

0148-396X

issn

1524-4040

pii

00006123-200801000-00023

journal_volume

62

pub_type

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