PRESENCE AND DIFFERENTIAL EXPRESSION OF SGLT1, GLUT1, GLUT2, GLUT3 AND GLUT5 HEXOSE-TRANSPORTER MESSENGER-RNAS IN CACO-2 CELL CLONES IN RELATION TO CELL-GROWTH AND GLUCOSE CONSUMPTION

被引:143
作者
MAHRAOUI, L [1 ]
RODOLOSSE, A [1 ]
BARBAT, A [1 ]
DUSSAULX, E [1 ]
ZWEIBAUM, A [1 ]
ROUSSET, M [1 ]
BROTLAROCHE, E [1 ]
机构
[1] INSERM,U178,UNITE RECH DIFFERENCIAT CELLULAIRE INTESTINALE,16 AVE PAUL VAILLANT COUTURIER,F-94807 VILLEJUIF,FRANCE
关键词
D O I
10.1042/bj2980629
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Seven clones from the Caco-2 cell line, three isolated from passage 29 (PD7, PD10, PF11) and four from passage 198 (TB10, TC7, TF3, TG6), all of them selected on the basis of differences in the levels of expression of sucrase-isomaltase and rates of glucose consumption, were analysed for the expression of hexose-transporter mRNAs (SGLT1, GLUT1-GLUT5) in relation to the phases of cell growth and the associated variations of the rates of glucose consumption. All clones showed a similar pattern of evolution of the rates of glucose consumption, which decreased from the exponential to the late-stationary phase, but differed, in a 1-40-fold range, in the values observed at late post-confluency. According to these values, clones could be divided into high- (PD10, PF11) and low-glucose-consuming cells (PD7, TB10. TC7, TF3 and TG6). GLUT1 and GLUT3 mRNAs were expressed in all clones and showed a similar pattern of evolution: their level decreased, from the exponential to the stationary phase, in close correlation with the decrease in rates of glucose consumption, with only high-glucose-consuming clones maintaining high levels in the stationary phase. In contrast, SGLT1, GLUT2 and GLUT5 mRNAs were only expressed, like sucrase-isomaltase mRNA, in the low-glucose-consuming clones, and their level increased from the exponential to the stationary phase, in parallel with the differentiation of the cells. GLUT4 was undetectable in all the clones. Glucose deprivation generally resulted in a discrete decrease in the levels of all transporter mRNAs in all clones, one exception being GLUT2, which in the high-glucose-consuming clones is only detectable when the cells are grown in low glucose. These clones should be ideal tools with which to study in vitro, at the single-cell level, how these transporters concur to the utilization and transport of hexoses and how their exclusive or co-ordinated expression is regulated.
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页码:629 / 633
页数:5
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