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DEDD interacts with PI3KC3 to activate autophagy and attenuate epithelial-mesenchymal transition in human breast

Qi Lv1, Wei Wang, Jianfei Xue

  • 1Molecular Immunology and Cancer Pharmacology Groups, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, PR China.

Cancer Research
|June 22, 2012
PubMed

Insights

Death-effector domain-containing DNA-binding protein (DEDD) suppresses tumor growth and metastasis by activating autophagy and degrading EMT regulators. DEDD may serve as a prognostic marker and therapeutic target for cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Epithelial-to-mesenchymal transition (EMT) is a key process in cancer invasion and metastasis.
  • Identifying endogenous suppressors of EMT is crucial for developing cancer therapies.

Purpose of the Study:

  • To investigate the role of death-effector domain-containing DNA-binding protein (DEDD) in regulating EMT and tumor metastasis.
  • To elucidate the molecular mechanism by which DEDD suppresses cancer progression.

Main Methods:

  • Assessed DEDD expression levels in patient cancer data.
  • Utilized in vitro and in vivo models to study the effects of DEDD overexpression and silencing on cell invasion.
  • Investigated the interaction between DEDD and class III PI-3-kinase (PI3KC3)/Beclin1.
  • Analyzed the impact of DEDD on autophagy and the degradation of EMT regulators (Snail, Twist).

Main Results:

  • DEDD expression inversely correlated with poor prognosis in breast and colon cancer patients.
  • DEDD overexpression attenuated cancer cell invasion, while DEDD silencing promoted it.
  • DEDD directly interacted with PI3KC3/Beclin1, activating autophagy and degrading Snail and Twist.
  • The DEDD-PI3KC3 interaction stabilized PI3KC3, enhancing autophagy and degradation of EMT regulators.

Conclusions:

  • DEDD acts as an endogenous tumor suppressor by inhibiting EMT, tumor growth, and metastasis.
  • DEDD functions by activating autophagy through interaction with PI3KC3/Beclin1, leading to the degradation of EMT master regulators.
  • DEDD represents a potential prognostic marker and therapeutic target for preventing and treating cancer metastasis.

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