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Inhibition of USP1, a new partner of Bcr-Abl, results in decrease of Bcr-Abl level in K562 cells

S V Antonenko1, G D Telegeev1

  • 1Institute of Molecular Biology and Genetics NAS of Ukraine, Kyiv 03143, Ukraine.

Experimental Oncology
|July 1, 2020
PubMed
Abstract

Insights

Ubiquitin specific peptidase 1 (USP1) directly interacts with Bcr-Abl oncoprotein in chronic myeloid leukemia cells. Inhibiting USP1 activity reduces Bcr-Abl levels, suggesting USP1 as a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • The Bcr-Abl oncoprotein is a key driver in chronic myeloid leukemia (CML).
  • Understanding Bcr-Abl interactions is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the interaction between ubiquitin specific peptidase 1 (USP1) and Bcr-Abl.
  • To determine the relationship between USP1 activity and Bcr-Abl expression in K562 CML cells.

Main Methods:

  • Co-immunoprecipitation to confirm protein interaction.
  • Western blot and confocal microscopy to analyze protein complex formation and localization.
  • Pharmacological inhibition of USP1 activity using ML323.

Main Results:

  • Direct interaction between USP1 and Bcr-Abl was confirmed in K562 cells.
  • The Bcr-Abl/USP1 complex was found to localize within the cell nucleus.
  • Inhibition of USP1 activity led to a significant reduction in Bcr-Abl oncoprotein levels.

Conclusions:

  • USP1 is identified as a novel protein partner of Bcr-Abl in CML.
  • A functional link exists between USP1 activity and Bcr-Abl expression levels.
  • Targeted inhibition of USP1 presents a potential therapeutic strategy for reducing Bcr-Abl in CML.

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