Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma

Abstract 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 (m6A) modification is implicated in GBM pathobiology. However,...

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Autores principales:	Fuxi Li, Siyun Chen, Jiaming Yu, Zhuoxing Gao, Zhangyi Sun, Yang Yi, Teng Long, Chuanxia Zhang, Yuzhe Li, Yimin Pan, Chaoying Qin, Wenyong Long, Qing Liu, Wei Zhao
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	glioblastoma histone modifications m6A METTL3 TMZ resistance Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/7854cee962c142b590ebd42800c8d82d
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spelling	oai:doaj.org-article:7854cee962c142b590ebd42800c8d82d2021-11-11T12:06:40ZInterplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma2001-132610.1002/ctm2.553https://doaj.org/article/7854cee962c142b590ebd42800c8d82d2021-09-01T00:00:00Zhttps://doi.org/10.1002/ctm2.553https://doaj.org/toc/2001-1326Abstract 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 (m6A) modification is implicated in GBM pathobiology. However, the roles and precise mechanisms of m6A modification in the regulation of TMZ resistance in GBM remain unclear. Methods m6A individual‐nucleotide‐resolution cross‐linking and immunoprecipitation sequencing (miCLIP‐seq) was performed to identify m6A 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 m6A methyltransferase METTL3, thereby increasing m6A 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 m6A 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 m6A 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.Fuxi LiSiyun ChenJiaming YuZhuoxing GaoZhangyi SunYang YiTeng LongChuanxia ZhangYuzhe LiYimin PanChaoying QinWenyong LongQing LiuWei ZhaoWileyarticleglioblastomahistone modificationsm6AMETTL3TMZ resistanceMedicine (General)R5-920ENClinical and Translational Medicine, Vol 11, Iss 9, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	glioblastoma histone modifications m6A METTL3 TMZ resistance Medicine (General) R5-920
spellingShingle	glioblastoma histone modifications m6A METTL3 TMZ resistance Medicine (General) R5-920 Fuxi Li Siyun Chen Jiaming Yu Zhuoxing Gao Zhangyi Sun Yang Yi Teng Long Chuanxia Zhang Yuzhe Li Yimin Pan Chaoying Qin Wenyong Long Qing Liu Wei Zhao Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
description	Abstract 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 (m6A) modification is implicated in GBM pathobiology. However, the roles and precise mechanisms of m6A modification in the regulation of TMZ resistance in GBM remain unclear. Methods m6A individual‐nucleotide‐resolution cross‐linking and immunoprecipitation sequencing (miCLIP‐seq) was performed to identify m6A 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 m6A methyltransferase METTL3, thereby increasing m6A 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 m6A 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 m6A 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	article
author	Fuxi Li Siyun Chen Jiaming Yu Zhuoxing Gao Zhangyi Sun Yang Yi Teng Long Chuanxia Zhang Yuzhe Li Yimin Pan Chaoying Qin Wenyong Long Qing Liu Wei Zhao
author_facet	Fuxi Li Siyun Chen Jiaming Yu Zhuoxing Gao Zhangyi Sun Yang Yi Teng Long Chuanxia Zhang Yuzhe Li Yimin Pan Chaoying Qin Wenyong Long Qing Liu Wei Zhao
author_sort	Fuxi Li
title	Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
title_short	Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
title_full	Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
title_fullStr	Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
title_full_unstemmed	Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma
title_sort	interplay of m6a and histone modifications contributes to temozolomide resistance in glioblastoma
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/7854cee962c142b590ebd42800c8d82d
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Interplay of m6A and histone modifications contributes to temozolomide resistance in glioblastoma

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