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Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma
BACKGROUND: Despite the development of new treatment protocols for glioblastoma (GBM), temozolomide (TMZ) resistance remains a primary hindrance. Previous studies, including our study, have shown that aberrant N6‐methyladenosine (m(6)A) modification is implicated in GBM pathobiology. However, the ro...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8441140/ https://www.ncbi.nlm.nih.gov/pubmed/34586728 http://dx.doi.org/10.1002/ctm2.553 |
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author | Li, Fuxi Chen, Siyun Yu, Jiaming Gao, Zhuoxing Sun, Zhangyi Yi, Yang Long, Teng Zhang, Chuanxia Li, Yuzhe Pan, Yimin Qin, Chaoying Long, Wenyong Liu, Qing Zhao, Wei |
author_facet | Li, Fuxi Chen, Siyun Yu, Jiaming Gao, Zhuoxing Sun, Zhangyi Yi, Yang Long, Teng Zhang, Chuanxia Li, Yuzhe Pan, Yimin Qin, Chaoying Long, Wenyong Liu, Qing Zhao, Wei |
author_sort | Li, Fuxi |
collection | PubMed |
description | BACKGROUND: Despite the development of new treatment protocols for glioblastoma (GBM), temozolomide (TMZ) resistance remains a primary hindrance. Previous studies, including our study, have shown that aberrant N6‐methyladenosine (m(6)A) modification is implicated in GBM pathobiology. However, the roles and precise mechanisms of m(6)A modification in the regulation of TMZ resistance in GBM remain unclear. METHODS: m(6)A individual‐nucleotide‐resolution cross‐linking and immunoprecipitation sequencing (miCLIP‐seq) was performed to identify m(6)A modification of transcripts in TMZ‐resistant and ‐sensitive tumors. To explore the role of METTL3 in TMZ resistance, TMZ‐resistant GBM cells were transfected with METTL3 shRNA or overexpression lentivirus and then assessed by cell viability, tumor sphere formation, and apoptosis assays. An intracranial GBM xenograft model was developed to verify the effect of METTL3 depletion during TMZ treatment in vivo. ATAC‐seq, ChIP‐qPCR, and dual‐luciferase reporter assays were carried out to verify the role of SOX4/EZH2 in the modulation of METTL3 expression upon TMZ treatment. RESULTS: We demonstrated that TMZ treatment upregulated the expression of the m(6)A methyltransferase METTL3, thereby increasing m(6)A modification of histone modification‐related gene transcripts. METTL3 is required to maintain the features of GBM stem cells. When combined with TMZ, METTL3 silencing suppressed orthotopic TMZ‐resistant xenograft growth in a cooperative manner. Mechanistically, TMZ induced a SOX4‐mediated increase in chromatin accessibility at the METTL3 locus by promoting H3K27ac levels and recruiting RNA polymerase II. Moreover, METTL3 depletion affected the deposition of m(6)A on histone modification‐related gene transcripts, such as EZH2, leading to nonsense‐mediated mRNA decay. We revealed an important role of EZH2 in the regulation of METTL3 expression, which was via an H3K27me3 modification‐independent manner. CONCLUSIONS: Our findings uncover the fundamental mechanisms underlying the interplay of m(6)A RNA modification and histone modification in TMZ resistance and emphasize the therapeutic potential of targeting the SOX4/EZH2/METTL3 axis in the treatment of TMZ‐resistant GBM. |
format | Online Article Text |
id | pubmed-8441140 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-84411402021-09-15 Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma Li, Fuxi Chen, Siyun Yu, Jiaming Gao, Zhuoxing Sun, Zhangyi Yi, Yang Long, Teng Zhang, Chuanxia Li, Yuzhe Pan, Yimin Qin, Chaoying Long, Wenyong Liu, Qing Zhao, Wei Clin Transl Med Research Articles BACKGROUND: Despite the development of new treatment protocols for glioblastoma (GBM), temozolomide (TMZ) resistance remains a primary hindrance. Previous studies, including our study, have shown that aberrant N6‐methyladenosine (m(6)A) modification is implicated in GBM pathobiology. However, the roles and precise mechanisms of m(6)A modification in the regulation of TMZ resistance in GBM remain unclear. METHODS: m(6)A individual‐nucleotide‐resolution cross‐linking and immunoprecipitation sequencing (miCLIP‐seq) was performed to identify m(6)A modification of transcripts in TMZ‐resistant and ‐sensitive tumors. To explore the role of METTL3 in TMZ resistance, TMZ‐resistant GBM cells were transfected with METTL3 shRNA or overexpression lentivirus and then assessed by cell viability, tumor sphere formation, and apoptosis assays. An intracranial GBM xenograft model was developed to verify the effect of METTL3 depletion during TMZ treatment in vivo. ATAC‐seq, ChIP‐qPCR, and dual‐luciferase reporter assays were carried out to verify the role of SOX4/EZH2 in the modulation of METTL3 expression upon TMZ treatment. RESULTS: We demonstrated that TMZ treatment upregulated the expression of the m(6)A methyltransferase METTL3, thereby increasing m(6)A modification of histone modification‐related gene transcripts. METTL3 is required to maintain the features of GBM stem cells. When combined with TMZ, METTL3 silencing suppressed orthotopic TMZ‐resistant xenograft growth in a cooperative manner. Mechanistically, TMZ induced a SOX4‐mediated increase in chromatin accessibility at the METTL3 locus by promoting H3K27ac levels and recruiting RNA polymerase II. Moreover, METTL3 depletion affected the deposition of m(6)A on histone modification‐related gene transcripts, such as EZH2, leading to nonsense‐mediated mRNA decay. We revealed an important role of EZH2 in the regulation of METTL3 expression, which was via an H3K27me3 modification‐independent manner. CONCLUSIONS: Our findings uncover the fundamental mechanisms underlying the interplay of m(6)A RNA modification and histone modification in TMZ resistance and emphasize the therapeutic potential of targeting the SOX4/EZH2/METTL3 axis in the treatment of TMZ‐resistant GBM. John Wiley and Sons Inc. 2021-09-15 /pmc/articles/PMC8441140/ /pubmed/34586728 http://dx.doi.org/10.1002/ctm2.553 Text en © 2021 The Authors. Clinical and Translational Medicine published by John Wiley & Sons Australia, Ltd on behalf of Shanghai Institute of Clinical Bioinformatics https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Articles Li, Fuxi Chen, Siyun Yu, Jiaming Gao, Zhuoxing Sun, Zhangyi Yi, Yang Long, Teng Zhang, Chuanxia Li, Yuzhe Pan, Yimin Qin, Chaoying Long, Wenyong Liu, Qing Zhao, Wei Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title | Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title_full | Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title_fullStr | Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title_full_unstemmed | Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title_short | Interplay of m(6)A and histone modifications contributes to temozolomide resistance in glioblastoma |
title_sort | interplay of m(6)a and histone modifications contributes to temozolomide resistance in glioblastoma |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8441140/ https://www.ncbi.nlm.nih.gov/pubmed/34586728 http://dx.doi.org/10.1002/ctm2.553 |
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