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TRIB3 Promotes APL Progression through Stabilization of the Oncoprotein PML-RARα and Inhibition of p53-Mediated Senescence.

Cancer cell | 2017

Acute promyelocytic leukemia (APL) is driven by the oncoprotein PML-RARα, which antagonizes myeloid differentiation and promotes APL-initiating cell self-renewal. Combined all-trans retinoic acid (ATRA) with arsenic trioxide (As2O3) or chemotherapy dramatically improves the prognosis of APL patients. Here we report that expression of pseudokinase Tribble 3 (TRIB3) associates positively with APL progression and therapeutic resistance. The elevated TRIB3 expression promotes APL by interacting with PML-RARα and suppressing its sumoylation, ubiquitylation, and degradation. This represses PML nuclear body assembly, p53-mediated senescence, and cell differentiation, and supports cellular self-renewal. Genetically inhibiting TRIB3 expression or combination of a peptide disturbing TRIB3/PML-RARα interaction with ATRA/As2O3 eradicates APL by accelerating PML-RARα degradation. Our study provides insight into APL pathogenesis and a potential therapeutic option against APL.

Pubmed ID: 28486108 RIS Download

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GraphPad Prism (tool)

RRID:SCR_002798

Statistical analysis software that combines scientific graphing, comprehensive curve fitting (nonlinear regression), understandable statistics, and data organization. Designed for biological research applications in pharmacology, physiology, and other biological fields for data analysis, hypothesis testing, and modeling.

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His-tag Polyclonal Antibody (antibody)

RRID:AB_10209426

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anti-HA-tag (antibody)

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GFP (antibody)

RRID:AB_591819

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anti-DDDDK-tag (antibody)

RRID:AB_11123930

This monoclonal targets anti-DDDDK-tag

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DDDDK-Tag (Enterokinase Cleavage Site), Agarose Conjugate (antibody)

RRID:AB_591225

This polyclonal targets DDDDK-Tag (Enterokinase Cleavage Site) Agarose Conjugate

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DDDDK-Tag (ECS/Enterokinase Cleavage Site) Polyclonal Antibody (antibody)

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RARA Antibody (C-term) (antibody)

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PA28-alpha Antibody (antibody)

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RNF4 Antibody (C-term) (antibody)

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Mouse Anti-β actin mAb (antibody)

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Ubc9 Antibody (antibody)

RRID:AB_2210600

This polyclonal targets Ube2i

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PIAS1 Antibody (N-term) (antibody)

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This polyclonal targets PIAS1

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SUMO2/3 Antibody (C-term) (antibody)

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SUMO2 Antibody (C-term) (antibody)

RRID:AB_2271308

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Monoclonal Anti-P16 antibody produced in mouse (antibody)

RRID:AB_10607981

This monoclonal targets P16 antibody produced in mouse

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RB1-human (antibody)

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p53 (1C12) Mouse mAb (antibody)

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Phospho-p53 (Ser15) Antibody (antibody)

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Mus musculus with name C57BL/6-Pmltm1(PML/RARA)Ley/J from IMSR.

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