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The relationship between the cyclic-RGDfK ligand and αvβ3 integrin receptor

Goutam Mondal1, Sugata Barui, Arabinda Chaudhuri

  • 1Division of Lipid Science and Technology, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India.

Biomaterials
|May 25, 2013
PubMed

Insights

Cyclic RGDfK peptides, widely used for cancer therapy, target multiple integrin receptors, not just αvβ3. This lipopeptide gene delivery system effectively inhibits tumor growth by targeting endothelial and tumor cells.

Area of Science:

  • Biomedical Engineering
  • Molecular Oncology
  • Drug Delivery Systems

Background:

  • αvβ3 integrin receptors are overexpressed on tumor vasculature endothelial cells.
  • Cyclic RGDfK peptides are widely used to target αvβ3 integrins for cancer therapy and imaging.
  • Previous research focused on the high selectivity of cyclic RGDfK for αvβ3 integrins.

Purpose of the Study:

  • To investigate the integrin receptor targeting capabilities of a lipopeptide containing the cyclic RGDfK ligand.
  • To evaluate the efficacy of this lipopeptide-based gene delivery system for cancer therapy.
  • To determine the receptor selectivity profile of the cyclic RGDfK ligand in a functional context.

Main Methods:

  • Development of a lipopeptide with a cyclic RGDfK head-group.
  • Complexation of cationic liposomes with the anti-cancer p53 gene.
  • Intravenous administration of the lipopeptide-gene complex in a syngeneic mouse tumor model.
  • Assessment of tumor growth inhibition and apoptosis induction.

Main Results:

  • The lipopeptide effectively delivered genes into endothelial and tumor cells via αvβ3, αvβ5, and α5β1 integrin receptors.
  • Intravenous administration resulted in significant tumor growth inhibition.
  • Tumor growth inhibition was presumably mediated by apoptosis of tumor neovasculatures.

Conclusions:

  • The cyclic RGDfK ligand demonstrates broader integrin receptor targeting than previously believed, interacting with αvβ3, αvβ5, and α5β1.
  • Lipopeptide-based gene delivery systems utilizing cyclic RGDfK show promise for anti-angiogenic cancer therapy.
  • This study challenges the notion of high αvβ3 integrin receptor selectivity for the cyclic RGDfK ligand.

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