Title :

Thymidylate Synthase O-GlcNAcylation: a molecular mechanism of 5-FU sensitization in colorectal cancer

Author(s) :

Very, Ninon [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Hardivillé, Stéphan [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Decourcelle, Amélie [Auteur]
Hétérogénéité, Plasticité et Résistance aux Thérapies des Cancers = Cancer Heterogeneity, Plasticity and Resistance to Therapies - UMR 9020 - U 1277 [CANTHER]
Thévenet, Julien [Auteur]
Recherche translationnelle sur le diabète - U 1190 [RTD]
Djouina, Madjid [Auteur]
Institute for Translational Research in Inflammation - U 1286 [INFINITE]
Page, Adeline [Auteur]
SFR Biosciences
Vergoten, Gérard [Auteur]
Institute for Translational Research in Inflammation - U 1286 [INFINITE]
Schulz, Céline [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Kerr-Conte, Julie [Auteur]
Recherche translationnelle sur le diabète - U 1190 [RTD]
Lefebvre, Tony [Auteur]
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]
Dehennaut, Vanessa [Auteur]
Hétérogénéité, Plasticité et Résistance aux Thérapies des Cancers = Cancer Heterogeneity, Plasticity and Resistance to Therapies - UMR 9020 - U 1277 [CANTHER]
El Yazidi- Belkoura, Ikram [Auteur]
Université de Lille
Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 [UGSF]

Journal title :

Oncogene

Pages :

745-756

Publisher :

Nature Publishing Group [1987-....]

Publication date :

2021-11-29

ISSN :

0950-9232

HAL domain(s) :

Sciences du Vivant [q-bio]

English abstract : [en]

Alteration of O-GlcNAcylation, a dynamic post-translational modification, is associated with tumorigenesis and tumor progression. Its role in chemotherapy response is poorly investigated. Standard treatment for colorectal ...
Show more >Alteration of O-GlcNAcylation, a dynamic post-translational modification, is associated with tumorigenesis and tumor progression. Its role in chemotherapy response is poorly investigated. Standard treatment for colorectal cancer (CRC), 5-fluorouracil (5-FU), mainly targets Thymidylate Synthase (TS). TS O-GlcNAcylation was reported but not investigated yet. We hypothesize that O-GlcNAcylation interferes with 5-FU CRC sensitivity by regulating TS. In vivo, we observed that combined 5-FU with Thiamet-G (O-GlcNAcase (OGA) inhibitor) treatment had a synergistic inhibitory effect on grade and tumor progression. 5-FU decreased O-GlcNAcylation and, reciprocally, elevation of O-GlcNAcylation was associated with TS increase. In vitro in non-cancerous and cancerous colon cells, we showed that 5-FU impacts O-GlcNAcylation by decreasing O-GlcNAc Transferase (OGT) expression both at mRNA and protein levels. Reciprocally, OGT knockdown decreased 5-FU-induced cancer cell apoptosis by reducing TS protein level and activity. Mass spectrometry, mutagenesis and structural studies mapped O-GlcNAcylated sites on T251 and T306 residues and deciphered their role in TS proteasomal degradation. We reveal a crosstalk between O-GlcNAcylation and 5-FU metabolism in vitro and in vivo that converges to 5-FU CRC sensitization by stabilizing TS. Overall, our data propose that combining 5-FU-based chemotherapy with Thiamet-G could be a new way to enhance CRC response to 5-FU.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Cancer Heterogeneity, Plasticity and Resistance to Therapies (CANTHER) - UMR 9020 - UMR 1277

Source :

Harvested from HAL