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Mol Cell Biol ; 38(17)2018 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-29941490

RESUMO

Cancer cells often heavily depend on the ubiquitin-proteasome system (UPS) for their growth and survival. Irrespective of their strong dependence on the proteasome activity, cancer cells, except for multiple myeloma, are mostly resistant to proteasome inhibitors. A major cause of this resistance is the proteasome bounce-back response mediated by NRF1, a transcription factor that coordinately activates proteasome subunit genes. To identify new targets for efficient suppression of UPS, we explored, using immunoprecipitation and mass spectrometry, the possible existence of nuclear proteins that cooperate with NRF1 and identified O-linked N-acetylglucosamine transferase (OGT) and host cell factor C1 (HCF-1) as two proteins capable of forming a complex with NRF1. O-GlcNAcylation catalyzed by OGT was essential for NRF1 stabilization and consequent upregulation of proteasome subunit genes. Meta-analysis of breast and colorectal cancers revealed positive correlations in the relative protein abundance of OGT and proteasome subunits. OGT inhibition was effective at sensitizing cancer cells to a proteasome inhibitor both in culture cells and a xenograft mouse model. Since active O-GlcNAcylation is a feature of cancer metabolism, our study has clarified a novel linkage between cancer metabolism and UPS function and added a new regulatory axis to the regulation of the proteasome activity.


Assuntos
Fator 1 Relacionado a NF-E2/metabolismo , Neoplasias/tratamento farmacológico , Neoplasias/metabolismo , Inibidores de Proteassoma/farmacologia , Acetilglucosamina/metabolismo , Animais , Linhagem Celular Tumoral , Resistencia a Medicamentos Antineoplásicos/fisiologia , Feminino , Glicosilação , Células HEK293 , Células HeLa , Fator C1 de Célula Hospedeira/química , Fator C1 de Célula Hospedeira/genética , Fator C1 de Célula Hospedeira/metabolismo , Humanos , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , N-Acetilglucosaminiltransferases/antagonistas & inibidores , N-Acetilglucosaminiltransferases/genética , N-Acetilglucosaminiltransferases/metabolismo , Fator 1 Relacionado a NF-E2/química , Fator 1 Relacionado a NF-E2/genética , Neoplasias/genética , Fator 1 Nuclear Respiratório , Regiões Promotoras Genéticas , Complexo de Endopeptidases do Proteassoma/genética , Complexo de Endopeptidases do Proteassoma/metabolismo , Domínios e Motivos de Interação entre Proteínas , Estabilidade Proteica , Ubiquitina/metabolismo , Ensaios Antitumorais Modelo de Xenoenxerto , Proteínas Contendo Repetições de beta-Transducina/química , Proteínas Contendo Repetições de beta-Transducina/metabolismo
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