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Effect of Radiation on the Regulation of Sodium-Dependent Glucose Transport in LLC-PK1 Epithelial Cell Line: Possible Model for Gene Expression

机译:辐射对LLC-pK1上皮细胞系中钠依赖性葡萄糖转运调节的影响:基因表达的可能模型

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Low concentrations of glucose cultured kidney epithelial cells (LLC-PK sub 1) to produce hexose transport proteins. We have investigated the effects of ionizing radiation on this induction process in plateau-phase cultures. The induced production of hexose transporters, requiring approximately 6 to 9 days for complete expression, can be inhibited by irradiation during the first 4 days. After the fourth postinduction day, radiation sensitivity decreases with almost no radiation effect on the induction of hexose transport apparent by the sixth day of the induction period. The D sub o value associated with the induction block is approximately 25 Gy, a value which is considerably greater than necessary to inhibit cell replication. Hexose transport, itself resistant to ionizing radiation at doses in excess of 100 Gy, is sensitive to cycloheximide throughout the induction period. The sensitivity to cycloheximide decreases during the last 2 days of the induction period, approximately 1 day after the reduction in radiosensitivity. Based on these properties hexose transport may be a convenient model for the study of radiation effects upon gene expression in this cell line.

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