O-GlcNAcylation of melanophilin enhances radiation resistance in glioblastoma via suppressing TRIM21 mediated ubiquitination

The molecular mechanism of glioblastoma (GBM) radiation resistance remains poorly understood. The aim of this study was to elucidate the potential role of Melanophilin (MLPH) O-GlcNAcylation and the specific mechanism through which it regulates GBM radiotherapy resistance. We found that MLPH was sig...

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Veröffentlicht in:Oncogene 2024-01, Vol.43 (1), p.61-75
Hauptverfasser: Xu, Lei, Ye, Yangfan, Tao, Zeqiang, Wang, Tian, Wei, Yutian, Cai, Wanzhi, Wan, Xin, Zhao, Pengzhan, Gu, Wei, Gu, Bin, Zhang, Liuchao, Tian, Yufei, Liu, Ning, Tu, Yiming, Ji, Jing
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container_issue 1
container_start_page 61
container_title Oncogene
container_volume 43
creator Xu, Lei
Ye, Yangfan
Tao, Zeqiang
Wang, Tian
Wei, Yutian
Cai, Wanzhi
Wan, Xin
Zhao, Pengzhan
Gu, Wei
Gu, Bin
Zhang, Liuchao
Tian, Yufei
Liu, Ning
Tu, Yiming
Ji, Jing
description The molecular mechanism of glioblastoma (GBM) radiation resistance remains poorly understood. The aim of this study was to elucidate the potential role of Melanophilin (MLPH) O-GlcNAcylation and the specific mechanism through which it regulates GBM radiotherapy resistance. We found that MLPH was significantly upregulated in recurrent GBM tumor tissues after ionizing radiation (IR). MLPH induced radiotherapy resistance in GBM cells and xenotransplanted human tumors through regulating the NF-κB pathway. MLPH was O-GlcNAcylated at the conserved serine 510, and radiation-resistant GBM cells showed higher levels of O-GlcNAcylation of MLPH. O-GlcNAcylation of MLPH protected its protein stability and tripartite motif containing 21(TRIM21) was identified as an E3 ubiquitin ligase promoting MLPH degradation whose interaction with MLPH was affected by O-GlcNAcylation. Our data demonstrate that MLPH exerts regulatory functions in GBM radiation resistance by promoting the NF-κB signaling pathway and that O-GlcNAcylation of MLPH both stabilizes and protects it from TRIM21-mediated ubiquitination. These results identify a potential mechanism of GBM radiation resistance and suggest a potential therapeutic strategy for GBM treatment.
doi_str_mv 10.1038/s41388-023-02881-6
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subjects 101/58
13/1
13/2
13/31
13/51
38/5
42/109
59/5
631/337/1427/2122
631/337/458/1524
631/67/1922
631/67/2327
631/67/68
64/114
82/80
Apoptosis
Brain cancer
Cell Biology
Cell Line, Tumor
Glioblastoma
Glioblastoma - genetics
Glioblastoma - pathology
Glioblastoma - radiotherapy
Human Genetics
Humans
Internal Medicine
Ionizing radiation
Medicine
Medicine & Public Health
Molecular modelling
Neoplasm Recurrence, Local
NF-kappa B - genetics
NF-κB protein
O-GlcNAcylation
Oncology
Radiation therapy
Signal transduction
Ubiquitin-protein ligase
Ubiquitination
title O-GlcNAcylation of melanophilin enhances radiation resistance in glioblastoma via suppressing TRIM21 mediated ubiquitination
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