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Syndecans and Their Synstatins: Targeting an Organizer of Receptor Tyrosine Kinase Signaling at the Cell-Matrix

Alan C Rapraeger1

  • 1Department of Human Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, United States.

Frontiers in Oncology
|November 15, 2021
PubMed

Insights

Syndecans coordinate receptor tyrosine kinases (RTKs) and integrins at cell adhesion sites. Peptide synstatins block these complexes, inhibiting tumor cell invasion, survival, and angiogenesis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Receptor tyrosine kinases (RTKs) and integrin matrix receptors are crucial for tumor cell proliferation, invasion, and survival.
  • Syndecans, a class of matrix receptors, organize RTKs and integrins at cell-matrix adhesion sites, forming functional units.
  • Docking motifs in syndecan extracellular domains are essential for localizing RTKs (e.g., EGFR, IGF-1R, VEGFR2, HER2) and integrins (e.g., αvβ3, αvβ5, α4β1, α3β1, α6β4).

Purpose of the Study:

  • To review the understanding of syndecan-coupled mechanisms in cancer.
  • To describe the development and function of synstatins as inhibitors of these receptor complexes.
  • To highlight the therapeutic potential of synstatins against tumor progression and angiogenesis.

Main Methods:

  • The review synthesizes current knowledge on syndecan-coupled receptor mechanisms.
  • It discusses peptide mimetics of syndecan docking motifs, termed "synstatins".
  • The review examines the efficacy of specific synstatins (SSTNIGF1R, SSTNVEGFR2, SSTNVLA-4, SSTNEGFR, SSTNHER2) in preclinical models.

Main Results:

  • Synstatins effectively prevent the assembly of RTK-integrin-syndecan complexes.
  • These inhibitors block downstream signaling activities crucial for tumor cell functions.
  • Synstatins demonstrate high efficacy against tumor cell invasion, survival, and angiogenesis in experimental models.

Conclusions:

  • Syndecan-coupled receptor complexes represent a critical vulnerability in cancer.
  • Synstatins offer a novel therapeutic strategy by disrupting these complexes.
  • Targeting syndecan-mediated receptor interactions holds significant promise for cancer treatment.
Keywords:
ASK-1CXCR4EGFRIGF-1RVEGFR2integrin signalingsynstatin

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