EFFECT OF HYPOXIA, GLUTAMINE AND GLUCOSE DEPRIVATION ON THE EXPRESSION OF mRNA OF THE RETINOBLASTOMA BINDING PROTEINS IN GLIOMA CELLS
DOI: http://dx.doi.org/10.30970/sbi.0501.136
Abstract
Hypoxia and ischemia, as well as endoplasmic reticulum stress, are principal factors which are necessary for tumor neovascularization and growth. We have studied the effect of blocking the endoplasmic reticulum – nuclei-1, the main signaling enzyme of stressing of the endoplasmic reticulum, on the expression of several retinoblastoma-related genes which play a significant role in the control of cell cycling, proliferation and apoptosis in glioma cell line U87. We have also studied the effect of hypoxia and ischemic conditions (glucose or glutamine deprivation) on the expression of these genes in control glioma cells and in subline of these cells with suppressed function of endoplasmic reticulum – nuclei-1 sensing and signaling enzyme. It was shown that blocking of endoplasmic reticulum – nuclei-1 signaling enzyme leads to increase in the expression levels of several retinoblastoma binding protein (RBBP) genes: RBBP2H1 (RDM5B), RBBP4 and RBBP8. Moreover, the expression levels of most of studied genes are significantly decreased under glucose or glutamine deprivation conditions both in control and endoplasmic reticulum – nuclei-1-deficient glioma cells. However, the expression levels of RBBP2H1 and RBBP2 (RDM5A) mRNA are increased in glutamine deprivation conditions in both tested cell types. The expression levels of RBBP4, RBBP7 and RBBP8 are decreased but such levels of RBBP2 and RBBP2H1 are increased in both tested cell types under the hypoxic conditions. Thus, the expression of most retinoblastoma-related genes is dependent on the endoplasmic reticulum – nuclei-1 signaling enzyme function in normal, hypoxic and ischaemic conditions.
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