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Original

Nox-generated ROS modulate glucose uptake in a leukaemic cell line

, , , , &
Pages 405-414 | Received 05 Dec 2007, Published online: 07 Jul 2009
 

Abstract

The discovery of superoxide-generating enzymes homologues of phagocytic NAD(P)H oxidase, the Nox family, has led to the concept that reactive oxygen species (ROS) are ‘intentionally’ generated with biological functions in various cell types. In this study, by treating an acute leukaemic cell line with different antioxidants, ROS generation was shown to be crucially involved in the modulation of glucose transport (mediated by Glut1), which is frequently up-regulated in cancer cells. Then, this study tried to elucidate ROS source(s) and mechanisms by which ROS are involved in Glut1 activity regulation. Results prove that Nox2 and Nox4 are the candidates and that phosphorylation processes are important in the regulation of glucose uptake on which cancer cells rely. On the whole, data suggest that both Glut1 and Nox homologues may be considered new potential targets in the treatment of leukaemia.

Abbreviations
CAPE=

caffeic acid phenethyl ester

DOG=

2-deoxy-D-glucose

DPI=

diphenylene iodonium

IL-3=

interleukin-3

IMDM=

Iscove's modified Dulbecco's medium

NHS=

normal human serum

PBS=

phosphate buffered saline

PI3-K=

phosphatidylinositol 3-kinase

PMSF=

phenylmethylsulphonyl fluoride

ROS=

reactive oxygen species

RS=

reactive species

TLCK=

N-tosyl-L-lysine chloromethyl ketone

TPCK=

N-tosyl-L-phenylalanine chloromethyl ketone.

Abbreviations
CAPE=

caffeic acid phenethyl ester

DOG=

2-deoxy-D-glucose

DPI=

diphenylene iodonium

IL-3=

interleukin-3

IMDM=

Iscove's modified Dulbecco's medium

NHS=

normal human serum

PBS=

phosphate buffered saline

PI3-K=

phosphatidylinositol 3-kinase

PMSF=

phenylmethylsulphonyl fluoride

ROS=

reactive oxygen species

RS=

reactive species

TLCK=

N-tosyl-L-lysine chloromethyl ketone

TPCK=

N-tosyl-L-phenylalanine chloromethyl ketone.

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