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Fbxw7 suppresses cancer metastasis by inhibiting niche formation

Kanae Yumimoto1, Keiichi I Nakayama1

  • 1Department of Molecular and Cellular Biology; Medical Institute of Bioregulation; Kyushu University ; Fukuoka, Japan.

Oncoimmunology
|September 26, 2015
PubMed

Insights

Loss of the Fbxw7 oncosuppressor in stromal cells boosts cancer spread by increasing CCL2 chemokine. This attracts immune cells to the tumor microenvironment, promoting metastasis.

Area of Science:

  • Oncology
  • Immunology
  • Cell Biology

Background:

  • Fbxw7 is a known tumor suppressor protein implicated in various cancers.
  • Its role in cancer metastasis, particularly within the bone marrow microenvironment, requires further elucidation.

Purpose of the Study:

  • To investigate the function of Fbxw7 in bone marrow-derived stromal cells (BMSCs) concerning cancer metastasis.
  • To determine the molecular mechanisms by which Fbxw7 loss influences the tumor microenvironment and promotes metastasis.

Main Methods:

  • Utilized genetic models to study Fbxw7 loss in BMSCs.
  • Assessed the production of chemokines, specifically CCL2, in the context of Fbxw7 deficiency.
  • Analyzed the infiltration of immune cells, including monocytic myeloid-derived suppressor cells (Mo-MDSCs) and macrophages, into metastatic sites.

Main Results:

  • Loss of Fbxw7 in BMSCs significantly increases the production of the chemokine CCL2.
  • Elevated CCL2 levels attract Mo-MDSCs and macrophages to the metastatic niche.
  • This immune cell accumulation driven by Fbxw7 loss promotes cancer metastasis.

Conclusions:

  • Fbxw7 acts as a critical suppressor of cancer metastasis within the bone marrow microenvironment.
  • Disruption of Fbxw7 in BMSCs creates a pro-metastatic niche via CCL2-mediated immune cell recruitment.
  • Targeting Fbxw7 or the CCL2 pathway could offer therapeutic strategies for preventing or treating cancer metastasis.
Keywords:
F-box proteinchemokinemetastasisnicheubiquitin ligase

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