<abstract xmlns="http://www.w3.org/1999/xhtml"><bold>Objective.</bold> The aim of the present investigation was to study the expression of genes encoding homeobox proteins ZEB2 (zinc finger E-box binding homeobox 2), TGIF1 (TGFB induced factor homeobox 1), SPAG4 (sperm associated antigen 4), LHX1 (LIM homeobox 1), LHX2, LHX6, NKX3-1 (NK3 homeobox 1), and PRRX1 (paired related homeobox 1) in U87 glioma cells in response to glucose deprivation in control glioma cells and cells with knockdown of ERN1 (endoplasmic reticulum to nucleus signaling 1), the major pathway of the endoplasmic reticulum stress signaling, for evaluation of it possible significance in the control of glioma growth through ERN1 signaling and chemoresistance.<bold>Methods.</bold> The expression level of homeobox family genes was studied in control (transfected by vector) and ERN1 knockdown U87 glioma cells under glucose deprivation condition by real-time quantitative polymerase chain reaction.<bold>Results.</bold> It was shown that the expression level of <italic>ZEB2</italic>, <italic>TGIF1</italic>, <italic>PRRX1</italic>, and <italic>LHX6</italic> genes was up-regulated in control glioma cells treated by glucose deprivation. At the same time, the expression level of three other genes (<italic>NKX3-1</italic>, <italic>LHX1</italic>, and <italic>LHX2</italic>) was down-regulated. Furthermore, ERN1 knockdown of glioma cells significantly modified the effect glucose deprivation condition on the expression almost all studied genes. Thus, treatment of glioma cells without ERN1 enzymatic activity by glucose deprivation condition lead to down-regulation of the expression level of <italic>ZEB2</italic> and <italic>SPAG4</italic> as well as to more significant up-regulation of <italic>PRRX1</italic> and <italic>TGIF1</italic> genes. Moreover, the expression of <italic>LHX6</italic> and <italic>NKX3-1</italic> genes lost their sensitivity to glucose deprivation but <italic>LHX1</italic> and <italic>LHX2</italic> genes did not change it significantly.<bold>Conclusions.</bold> The results of this investigation demonstrate that ERN1 knockdown significantly modifies the sensitivity of most studied homeobox gene expressions to glucose deprivation condition and that these changes are a result of complex interaction of variable endoplasmic reticulum stress related and unrelated regulatory factors and contributed to glioma cell growth and possibly to their chemoresistance.</abstract>

Objective. The aim of the present investigation was to study the expression of genes encoding homeobox proteins ZEB2 (zinc finger E-box binding homeobox 2), TGIF1 (TGFB induced factor homeobox 1), SPAG4 (sperm associated antigen 4), LHX1 (LIM homeobox 1), LHX2, LHX6, NKX3-1 (NK3 homeobox 1), and PRRX1 (paired related homeobox 1) in U87 glioma cells in response to glucose deprivation in control glioma cells and cells with knockdown of ERN1 (endoplasmic reticulum to nucleus signaling 1), the major pathway of the endoplasmic reticulum stress signaling, for evaluation of it possible significance in the control of glioma growth through ERN1 signaling and chemoresistance.Methods. The expression level of homeobox family genes was studied in control (transfected by vector) and ERN1 knockdown U87 glioma cells under glucose deprivation condition by real-time quantitative polymerase chain reaction.Results. It was shown that the expression level of ZEB2, TGIF1, PRRX1, and LHX6 genes was up-regulated in control glioma cells treated by glucose deprivation. At the same time, the expression level of three other genes (NKX3-1, LHX1, and LHX2) was down-regulated. Furthermore, ERN1 knockdown of glioma cells significantly modified the effect glucose deprivation condition on the expression almost all studied genes. Thus, treatment of glioma cells without ERN1 enzymatic activity by glucose deprivation condition lead to down-regulation of the expression level of ZEB2 and SPAG4 as well as to more significant up-regulation of PRRX1 and TGIF1 genes. Moreover, the expression of LHX6 and NKX3-1 genes lost their sensitivity to glucose deprivation but LHX1 and LHX2 genes did not change it significantly.Conclusions. The results of this investigation demonstrate that ERN1 knockdown significantly modifies the sensitivity of most studied homeobox gene expressions to glucose deprivation condition and that these changes are a result of complex interaction of variable endoplasmic reticulum stress related and unrelated regulatory factors and contributed to glioma cell growth and possibly to their chemoresistance.

ERN1 knockdown modifies the effect of glucose deprivation on homeobox gene expressions in U87 glioma cells

Department of Molecular Biology, Palladin Institute of Biochemistry

Biology Institute Shandong Academy of Sciences

Endocrine Regulations

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Objective. The aim of the present investigation was to study the expression of genes encoding homeobox proteins ZEB2 (zinc finger E-box binding homeobox 2),...

ERN1 knockdown modifies the effect of glucose deprivation on homeobox gene expressions in U87 glioma cells

Published Online: Aug 27, 2020

Page range: 196 - 206

DOI: https://doi.org/10.2478/enr-2020-0022

Keywords
ERN1 knockdown, homeobox genes, mRNA expression, glucose deprivation, U87 glioma cells

© 2020 Dariia O. Tsymbal et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

ERN1 knockdown modifies the effect of glucose deprivation on homeobox gene expressions in U87 glioma cells

Published Online: Aug 27, 2020

Page range: 196 - 206

DOI: https://doi.org/10.2478/enr-2020-0022

KeywordsERN1 knockdown, homeobox genes, mRNA expression, glucose deprivation, U87 glioma cells

© 2020 Dariia O. Tsymbal et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
ERN1 knockdown, homeobox genes, mRNA expression, glucose deprivation, U87 glioma cells