TRIB1 confers therapeutic resistance in GBM cells by activating the ERK and Akt pathways

Karnika Singh, Chunhua Han, Jessica L Fleming, Aline P Becker, Joseph McElroy, Tiantian Cui, Benjamin Johnson, Ashok Kumar, Ebin Sebastian, Christian A Showalter, Morgan S Schrock, Matthew K Summers, Valesio Becker, Zhen-Yue Tong, Xiaomei Meng, Heather R Manring, Monica Venere, Erica H Bell, Pierre A Robe, A L GrosuS Jaharul Haque, Arnab Chakravarti*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

GBM (Glioblastoma) is the most lethal CNS (Central nervous system) tumor in adults, which inevitably develops resistance to standard treatments leading to recurrence and mortality. TRIB1 is a serine/threonine pseudokinase which functions as a scaffold platform that initiates degradation of its substrates like C/EBPα through the ubiquitin proteasome system and also activates MEK and Akt signaling. We found that increased TRIB1 gene expression associated with worse overall survival of GBM patients across multiple cohorts. Importantly, overexpression of TRIB1 decreased RT/TMZ (radiation therapy/temozolomide)-induced apoptosis in patient derived GBM cell lines in vitro. TRIB1 directly bound to MEK and Akt and increased ERK and Akt phosphorylation/activation. We also found that TRIB1 protein expression was maximal during G2/M transition of cell cycle in GBM cells. Furthermore, TRIB1 bound directly to HDAC1 and p53. Importantly, mice bearing TRIB1 overexpressing tumors had worse overall survival. Collectively, these data suggest that TRIB1 induces resistance of GBM cells to RT/TMZ treatments by activating the cell proliferation and survival pathways thus providing an opportunity for developing new targeted therapeutics.

Original languageEnglish
Article number12424
JournalScientific Reports
Volume13
Issue number1
DOIs
Publication statusPublished - 1 Aug 2023

Keywords

  • Animals
  • Apoptosis/genetics
  • Brain Neoplasms/drug therapy
  • Cell Line, Tumor
  • Drug Resistance, Neoplasm/genetics
  • Glioblastoma/drug therapy
  • Mice
  • Mitogen-Activated Protein Kinase Kinases
  • Proto-Oncogene Proteins c-akt/metabolism
  • Temozolomide/pharmacology

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