Cellular physiology and biochemistry, 2018-11, Vol.51 (1), p.113-128
2018
Volltextzugriff (PDF)
Details
- Autor(en) / Beteiligte
- Titel
- Knockdown of Long Non-Coding RNA XIST Inhibited Doxorubicin Resistance in Colorectal Cancer by Upregulation of miR-124 and Downregulation of SGK1
- Ist Teil von
- Cellular physiology and biochemistry, 2018-11, Vol.51 (1), p.113-128
- Ort / Verlag
- Basel, Switzerland: S. Karger AG
- Erscheinungsjahr
- 2018
- Quelle
- MEDLINE
- Beschreibungen/Notizen
- Background/Aims: Doxorubicin (DOX) is a widely used chemotherapeutic agent for colorectal cancer (CRC). However, the acquirement of DOX resistance limits its clinical application for cancer therapy. Mounting evidence has suggested that aberrantly expressed lncRNAs contribute to drug resistance of various tumors. Our study aimed to explore the role and molecular mechanisms of lncRNA X-inactive specific transcript (XIST) in chemoresistance of CRC to DOX. Methods: The expressions of XIST, miR-124, serum and glucocorticoid-inducible kinase 1 (SGK1) mRNA in DOX-resistant CRC tissues and cells were detected by qRT-PCR or western blot analysis. DOX sensitivity was assessed by detecting IC50 value of DOX, the protein levels of P-glycoprotein (P-gp) and glutathione S-transferase-π (GST-π) and apoptosis. The interactions between XIST, miR-124 and SGK1 were confirmed by luciferase reporter assay, qRT-PCR and western blot. Xenograft tumor assay was used to verify the role of XIST in DOX resistance in CRC in vivo. Results: XIST expression was upregulated and miR-124 expression was downregulated in DOX-resistant CRC tissues and cells. Knockdown of XIST inhibited DOX resistance of CRC cells, as evidenced by the reduced IC50 value of DOX, decreased P-gp and GST-π levels and enhanced apoptosis in XIST-silenced DOX-resistant CRC cells. Additionally, XIST positively regulated SGK1 expression by interacting with miR-124 in DOX-resistant CRC cells. miR-124 suppression strikingly reversed XIST-knockdown-mediated repression on DOX resistance in DOX-resistant CRC cells. Moreover, SGK1-depletion-elicited decrease of DOX resistance was greatly restored by XIST overexpression or miR-124 inhibition in DOX-resistant CRC cells. Furthermore, XIST knockdown enhanced the anti-tumor effect of DOX in CRC in vivo. Conclusion: XIST exerted regulatory function in resistance of DOX possibly through miR-124/SGK1 axis, shedding new light on developing promising therapeutic strategy to overcome chemoresistance in CRC patients.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1015-8987eISSN: 1421-9778DOI: 10.1159/000495168Titel-ID: cdi_pubmed_primary_30439718
- Format
- –
- Schlagworte
- 3' Untranslated Regions, Animals, Antagomirs - metabolism, Apoptosis, ATP Binding Cassette Transporter, Subfamily B, Member 1 - metabolism, Cancer therapies, Cell growth, Cell Line, Tumor, Cellulose acetate, Chemotherapy, Colorectal cancer, Colorectal Neoplasms - drug therapy, Colorectal Neoplasms - metabolism, Colorectal Neoplasms - pathology, Down-Regulation - drug effects, Doxorubicin, Doxorubicin - pharmacology, Doxorubicin - therapeutic use, Drug resistance, Drug Resistance, Neoplasm - genetics, Female, Gastric cancer, Gene expression, Glutathione S-Transferase pi - metabolism, Humans, Immediate-Early Proteins - chemistry, Immediate-Early Proteins - genetics, Immediate-Early Proteins - metabolism, Infections, Kinases, LncRNA, Mice, Mice, Inbred BALB C, Mice, Nude, MicroRNAs, MicroRNAs - antagonists & inhibitors, MicroRNAs - genetics, MicroRNAs - metabolism, miR-124, Original Paper, Plasmids, Protein-Serine-Threonine Kinases - chemistry, Protein-Serine-Threonine Kinases - genetics, Protein-Serine-Threonine Kinases - metabolism, RNA Interference, RNA, Long Noncoding - antagonists & inhibitors, RNA, Long Noncoding - genetics, RNA, Long Noncoding - metabolism, RNA, Small Interfering - metabolism, RNA, Small Interfering - therapeutic use, SGK1, Tumors, Up-Regulation - drug effects, XIST