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A Flow Cytometry-based Assay to Identify Compounds That Disrupt Binding of Fluorescently-labeled CXC Chemokine Ligand 12 to CXC Chemokine Receptor 4
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Monomeric and dimeric CXCL12 inhibit metastasis through distinct CXCR4 interactions and signaling pathways

Luke J Drury1, Joshua J Ziarek, Stéphanie Gravel

  • 1Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, 8701 West Watertown Plank Road, Milwaukee, WI 53214, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 13, 2011
PubMed

Insights

Administering CXCL12 limits cancer metastasis by selectively targeting CXCR4 signaling. Dimeric CXCL12 halts metastasis, while monomeric CXCL12 promotes it, revealing a novel therapeutic strategy for cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • Chemokines and chemokine receptors play a crucial role in cancer metastasis.
  • Epigenetic silencing of CXCL12 in cancer cells promotes metastasis.
  • The precise mechanism of CXCL12 in regulating tumor cell dissemination is not fully understood.

Purpose of the Study:

  • To investigate the mechanism by which CXCL12 regulates cancer metastasis.
  • To determine the distinct roles of monomeric and dimeric CXCL12 in metastasis.
  • To explore the potential of CXCL12 administration as a therapeutic strategy against cancer metastasis.

Main Methods:

  • Administration of CXCL12 (monomeric and dimeric variants) to tumor-bearing mice.
  • Analysis of intracellular calcium mobilization, cAMP signaling, β-arrestin recruitment, and filamentous-actin accumulation.
  • Utilizing Nuclear Magnetic Resonance (NMR) to analyze CXCL12-CXCR4 interactions.
  • Assessing tumor metastasis and survival rates in mice.

Main Results:

  • Administration of CXCL12 significantly extended survival and limited metastasis in colorectal carcinoma and melanoma models.
  • Monomeric CXCL12 promoted cell migration and associated signaling pathways.
  • Dimeric CXCL12 inhibited metastasis by distinct signaling pathways, including ERK1/2 activation, without promoting migration.
  • NMR studies revealed structural differences in CXCL12 monomer-CXCR4 interactions compared to dimer interactions.

Conclusions:

  • CXCL12 administration can inhibit CXCR4-mediated metastasis.
  • The quaternary structure of CXCL12 dictates its function in regulating cancer cell migration and metastasis.
  • Selective CXCR4 signaling, modulated by ligand structure, offers a potential therapeutic target for inhibiting cancer metastasis.

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