1. Effect of glucose deprivation on the expression of genes encoding glucocorticoid receptor and some related factors in ERN1-knockdown U87 glioma cells
- Author
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Oleksandr H. Minchenko, Myroslava Y. Sliusar, Olha V. Rudnytska, Dariia O. Tsymbal, O O Riabovol, Kateryna M. Lebid-Biletska, and Dmytro O. Minchenko
- Subjects
0301 basic medicine ,nr3c1 ,Endocrinology, Diabetes and Metabolism ,nr3c2 ,0302 clinical medicine ,Endocrinology ,Glucocorticoid receptor ,Gene expression ,Guanine Nucleotide Exchange Factors ,Gene knockdown ,Brain Neoplasms ,glucose deprivation ,ahr ,Transfection ,Glioma ,nnt ,Cell biology ,Nuclear Receptor Interacting Protein 1 ,Gene Expression Regulation, Neoplastic ,Real-time polymerase chain reaction ,030220 oncology & carcinogenesis ,Gene Knockdown Techniques ,mrna expression ,Signal Transduction ,sgk3 ,sgk1 ,Protein Serine-Threonine Kinases ,nrip1 ,NADP Transhydrogenase, AB-Specific ,Diseases of the endocrine glands. Clinical endocrinology ,Immediate-Early Proteins ,Mitochondrial Proteins ,arhgap35 ,03 medical and health sciences ,Receptors, Glucocorticoid ,Cell Line, Tumor ,Endoribonucleases ,medicine ,Humans ,ern1 inhibition ,Cell Proliferation ,u87 glioma cells ,Endoplasmic reticulum ,Aryl Hydrocarbon Receptor Nuclear Translocator ,medicine.disease ,RC648-665 ,ERN1 ,Repressor Proteins ,030104 developmental biology ,Glucose - Abstract
Objective. The aim of the present study was to examine the effect of glucose deprivation on the expression of genes encoded glucocorticoid receptor (NR3C1) and some related proteins (NR3C2, AHR, NRIP1, NNT, ARHGAP35, SGK1, and SGK3) in U87 glioma cells in response to inhibition of endoplasmic reticulum stress signaling mediated by ERN1/IRE1 (endoplasmic reticulum to nucleus signaling 1/inositol requiring enzyme 1) for evaluation of their possible significance in the control of glioma growth through endoplasmic reticulum stress signaling mediated by IRE1 and glucose deprivation. Methods. The expression of NR3C1, NR3C2, AHR, NRIP1, NNT, ARHGAP35, SGK1, and SGK3 genes in U87 glioma cells transfected by empty vector pcDNA3.1 (control cells) and cells without ERN1 signaling enzyme function (transfected by dnERN1) under glucose deprivation was studied by real time quantitative polymerase chain reaction. Results. It was shown that the expression level of NR3C2, AHR, SGK1, SGK3, and NNT genes was up-regulated in control U87 glioma cells under glucose deprivation condition in comparison with the control cells growing with glucose. At the same time, the expression of NRIP1 gene is down-regulated in these glioma cells under glucose deprivation, but NR3C1 and ARHGAP35 genes was resistant to this experimental condition. We also showed that inhibition of ERN1 signaling enzyme function significantly modified the response of most studied gene expressions to glucose deprivation condition. Thus, effect of glucose deprivation on the expression level of NR3C2, AHR, and SGK1 genes was significantly stronger in ERN1 knockdown U87 glioma cells since the expression of NNT gene was resistant to glucose deprivation condition. Moreover, the inhibition of ERN1 enzymatic activities in U87 glioma cells led to up-regulation of ARHGAP35 gene expression and significant down-regulation of the expression of SGK3 gene in response to glucose deprivation condition. Conclusions. Results of this study demonstrated that glucose deprivation did not change the expression level of NR3C1 gene but it significantly affected the expression of NR3C2, AHR, NRIP, SGK1, SGK3, and NNT genes in vector-transfected U87 glioma cells in gene specific manner and possibly contributed to the control of glioma growth since the expression of most studied genes in glucose deprivation condition was significantly dependent on the functional activity of IRE1 signaling enzyme.
- Published
- 2019