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Smurf1 regulation of DAB2IP controls cell proliferation and migration

Xiaoning Li1,2, Xiangpeng Dai2, Lixin Wan2

  • 1Department of Pathophysiology, Basic Medical College, Jilin University, Changchun 130021, China.

Oncotarget
|April 2, 2016
PubMed

Insights

The oncoprotein Smurf1 negatively regulates the tumor suppressor DAB2IP, promoting cancer cell growth and migration. Akt kinases enhance Smurf1 activity, further reducing DAB2IP levels in tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Tumor cell proliferation, survival, and migration are critical processes regulated by the tumor suppressor ovarian carcinoma 2/disabled homolog 2 (DOC-2/DAB2) interacting protein (DAB2IP).
  • DAB2IP acts as a scaffold protein for H-Ras and TRAF2 and is epigenetically downregulated by EZH2 in various cancers.
  • Previous research indicated that DAB2IP is negatively regulated by Akt-dependent phosphorylation and SCFFbw7-mediated degradation.

Purpose of the Study:

  • To identify novel regulators of DAB2IP.
  • To elucidate the role of Smurf1 in regulating DAB2IP and its impact on cancer progression.
  • To investigate the interplay between Akt kinases, Smurf1, and DAB2IP in tumorigenesis.

Main Methods:

  • Investigated the interaction between Smurf1 and DAB2IP.
  • Utilized cell-based assays to assess the impact of Smurf1 on cellular proliferation and migration.
  • Examined the role of Akt kinases in phosphorylating and regulating Smurf1 abundance.
  • Analyzed the effect of Smurf1 on DAB2IP levels in cancer cells.

Main Results:

  • Identified the oncoprotein Smurf1, an E3-ubiquitin ligase, as a novel negative regulator of DAB2IP.
  • Demonstrated that Smurf1-mediated cellular proliferation and migration are dependent on DAB2IP, positioning DAB2IP as a key effector of Smurf1's oncogenic function.
  • Showed that Akt1 and Akt2 kinases phosphorylate Smurf1, enhancing its abundance and consequently reducing DAB2IP levels.
  • Confirmed that Smurf1 negatively regulates DAB2IP, contributing to aberrant cell growth and migration.

Conclusions:

  • Smurf1 is a novel upstream oncogenic factor that negatively regulates the tumor suppressor DAB2IP.
  • The Akt-Smurf1-DAB2IP axis plays a significant role in governing aberrant cell growth and migration in cancer.
  • Targeting Smurf1 may represent a therapeutic strategy for cancers where DAB2IP is downregulated.
Keywords:
AktDAB2IPSmurf1cancerdegradation

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