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Prolactin/growth hormone-derived antiangiogenic peptides highlight a potential role of tilted peptides in

Ngoc-Quynh-Nhu Nguyen1, Sebastien P Tabruyn, Laurence Lins

  • 1Laboratory of Molecular Biology and Genetic Engineering, Center of Biomedical Integrative Genoproteomics, University of Liège, B-4000 Liège, Belgium.

Proceedings of the National Academy of Sciences of the United States of America
|September 16, 2006
PubMed

Insights

Tilted peptides, characterized by an asymmetric hydrophobic distribution, demonstrate significant antiangiogenic activity. These peptides inhibit endothelial cell proliferation and capillary formation, suggesting a new role in regulating angiogenesis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Angiogenesis is vital for tumor growth and metastasis.
  • Previous studies identified 16-kDa fragments of human prolactin/growth hormone (PRL/GH) family members as angiogenesis inhibitors.

Purpose of the Study:

  • To investigate the antiangiogenic activity of tilted peptides.
  • To determine if tilted peptides are responsible for the antiangiogenic effects of PRL/GH fragments.

Main Methods:

  • Characterization of peptide structure and hydrophobicity.
  • In vitro assays for endothelial cell apoptosis, proliferation, and capillary formation.
  • In vivo angiogenesis assays.
  • Mutational analysis of peptide hydrophobicity gradients.

Main Results:

  • All studied PRL/GH fragments contain a 14-amino acid tilted peptide sequence.
  • Tilted peptides from prolactin and growth hormone induced endothelial cell apoptosis, inhibited proliferation, and reduced capillary formation in vitro and in vivo.
  • Mutating the hydrophobicity gradient abolished these antiangiogenic effects.
  • Known tilted peptides from simian immunodeficiency virus gp32 and Alzheimer's beta-amyloid peptide also exhibited angiogenesis inhibitory properties.

Conclusions:

  • Tilted peptides possess inherent antiangiogenic activity.
  • The specific structural characteristic of tilted peptides is crucial for their antiangiogenic function.
  • Tilted peptides represent a potential new class of angiogenesis regulators with therapeutic implications.

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