Abstract | BACKGROUND/AIM: METHODS: The glioblastoma cell lines U251 and U87 were exposed to increasing concentrations of TMZ to generate TMZ-resistant colonies (the U251/TMZ and U87/TMZ cell lines). The expression levels of MALAT1 and proteins related to epithelial-mesenchymal transition (EMT) were detected by real-time PCR and western blot, respectively. After the transfection of si-MALAT1 or pcDNA-MALAT1, cell viability, mRNA expression of MDR-associated proteins (MDR1, MRP5 and LRP1), and protein expression of EMT related proteins (ZEB1, Snail and SLUG) were evaluated. RESULTS: The expression of MALAT1 was upregulated in the U251/TMZ and U87/TMZ cell lines compared to that in U251 and U87 cell lines, respectively. The treatment of si-MALAT1 decreased MDR1, MRP5, and LRP1 expression, enhanced cell sensitivity to TMZ, and downregulated ZEB1 protein expression, whereas pcDNA-MALAT1 had the opposite effects. However, the effects of si-MALAT1 on MDR -associated protein expression, cell viability, and EMT status were reversed by the transfection of pcDNA-ZEB1, and the effects of pcDNA-MALAT1 were reversed by the transfection of si-ZEB1. In vivo, MALAT1 overexpression enhanced tumors' TMZ resistance and upregulated ZEB1 expression. CONCLUSION: MALAT1 decreased the sensitivity of resistant glioma cell lines to TMZ by regulating ZEB1.
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Authors | Hongwei Li, Xiaoli Yuan, Dongming Yan, Dongpeng Li, Fangxia Guan, Yang Dong, Hao Wang, Xianzhi Liu, Bo Yang |
Journal | Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology
(Cell Physiol Biochem)
Vol. 42
Issue 3
Pg. 1192-1201
( 2017)
ISSN: 1421-9778 [Electronic] Germany |
PMID | 28668966
(Publication Type: Journal Article)
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Copyright | © 2017 The Author(s). Published by S. Karger AG, Basel. |
Chemical References |
- Antineoplastic Agents, Alkylating
- MALAT1 long non-coding RNA, human
- RNA, Long Noncoding
- ZEB1 protein, human
- Zinc Finger E-box-Binding Homeobox 1
- Dacarbazine
- Temozolomide
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Topics |
- Antineoplastic Agents, Alkylating
(pharmacology)
- Brain
(drug effects, metabolism, pathology)
- Brain Neoplasms
(drug therapy, genetics, pathology)
- Cell Line, Tumor
- Dacarbazine
(analogs & derivatives, pharmacology)
- Drug Resistance, Neoplasm
- Epithelial-Mesenchymal Transition
(drug effects)
- Gene Expression Regulation, Neoplastic
- Glioblastoma
(drug therapy, genetics, pathology)
- Humans
- RNA, Long Noncoding
(genetics)
- Temozolomide
- Up-Regulation
- Zinc Finger E-box-Binding Homeobox 1
(genetics)
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