Sevoflurane promotes the expansion of glioma stem cells through activation of hypoxia-inducible factors in vitro.

Abstract:

BACKGROUND:Growing evidences indicate that inhalational anaesthetics can enhance the growth and malignant potential of tumour cells and may affect tumour recurrence after surgery. Tumour stem cells play a vital role in tumour recurrence. This study investigates the effect of sevoflurane on glioma stem cells (GSCs) in vitro and the underlying molecular mechanisms in this process. METHODS:Cultured GSCs were exposed to clinically relevant concentrations and durations of sevoflurane exposure. Cell proliferation and self-renewal capacity were determined. Expression of the stem cell marker CD133, vascular endothelial growth factor (VEGF), hypoxia-inducible factors (HIFs), and phosphorylated Akt, which is a protein kinase invoved in multiple cellular processes, were measured using western blotting. Small interfering RNAs and an Akt inhibitor were used to investigate specific pathways. RESULTS:Compared with controls, cells exposed to 2% sevoflurane for 6 h induced a larger number of proliferated cells (31.2±7.6% vs 19.0±5.8%; P<0.01). Levels of CD133, VEGF, HIF-1α, HIF-2α, and p-Akt were up-regulated by sevoflurane in a time- and concentration-dependent manner. Small interfering RNA against HIFs decreased the percentage of proliferating GSCs after sevoflurane exposure and pre-treatment of cells with an Akt inhibitor abrogated the expression of HIFs induced by sevoflurane. CONCLUSIONS:Sevoflurane can promote the expansion of human GSCs through HIFs in vitro. Inhaled anaesthetics may enhance tumour growth through tumour stem cells.

journal_name

Br J Anaesth

authors

Shi QY,Zhang SJ,Liu L,Chen QS,Yu LN,Zhang FJ,Yan M

doi

10.1093/bja/aeu402

subject

Has Abstract

pub_date

2015-05-01 00:00:00

pages

825-30

issue

5

eissn

0007-0912

issn

1471-6771

pii

S0007-0912(17)31300-4

journal_volume

114

pub_type

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