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CXCR6-CXCL16 Axis Promotes Breast Cancer by Inducing Oncogenic Signaling.

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The CXCR6/CXCL16 signaling axis promotes breast cancer metastasis and survival. Targeting this axis and ADAM10 may offer new treatments for advanced breast cancer.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Breast cancer (BrCa) metastasis mechanisms remain unclear, hindering effective treatment development.
  • Chemokine signaling plays a role in cancer cell and leukocyte trafficking.

Purpose of the Study:

  • To investigate the clinical and biological significance of the CXCR6/CXCL16 signaling axis in breast cancer pathobiology.
  • To identify potential therapeutic targets for advanced-stage breast cancer.

Main Methods:

  • Analyzed CXCR6 expression in BrCa cell lines and tissues across different stages.
  • Measured levels of CXCL16 fragments (N-terminal and C-terminal) and ADAM10 in BrCa tissues.
  • Utilized antibody microarray analysis to identify activated signaling pathways upon CXCR6/CXCL16 axis stimulation.
  • Assessed the impact of the axis on F-actin polymerization, cytoskeleton rearrangement, migration, invasion, and cell survival.

Main Results:

  • CXCR6 expression was higher in BrCa cell lines and tissues, with significantly elevated levels in stage-III compared to stage-II BrCa.
  • N-terminal CXCL16 and ADAM10 levels were also significantly higher in stage-III BrCa tissues.
  • Stimulation of the CXCR6/CXCL16 axis activated key signaling pathways including Src, FAK, ERK1/2, and PI3K/Akt.
  • The axis promotes cytoskeleton rearrangement, cell migration, invasion, and survival.

Conclusions:

  • The CXCR6/CXCL16 signaling axis is clinically and biologically significant in breast cancer progression.
  • Elevated CXCR6, N-terminal CXCL16, and ADAM10 are associated with advanced-stage breast cancer.
  • The CXCR6/CXCL16 axis and ADAM10 represent promising therapeutic targets for advanced-stage BrCa.