# Phosvitin-Derived Peptide Pt5-1c Is a Pro-Angiogenic Agent Capable of Enhancing Wound Healing

## TL;DR

A peptide from fish phosvitin, Pt5-1c, promotes blood vessel growth and wound healing in animal models.

## Contribution

Pt5-1c is a novel pro-angiogenic agent with potential for vascular regenerative therapy.

## Key findings

- Pt5-1c enhances angiogenesis in murine and zebrafish models.
- Pt5-1c promotes endothelial cell motility, adhesion, and tube formation.
- Pt5-1c activates PI3K/AKT/mTOR and p38 MAPK pathways to induce proangiogenic effects.

## Abstract

Antimicrobial peptides (AMPs) have been shown to have pro-angiogenic activity, capable of enhancing neovascularization and facilitating the healing of chronic wounds. However, information as such remains rather limited. Here we clearly showed that the fish phosvitin-derived AMP Pt5-1c was able to enhance angiogenesis in both murine full-thickness wound models and zebrafish with vascular defects models. We also showed that Pt5-1c was able to promote endothelial cell motility, adhesion, survival, filopodia protrusion, and induce endothelial tube formation. In addition, we found that Pt5-1c could upregulate production of proangiogenic factors including VEGF, PDGF, FGF and EGF. It was revealed that Pt5-1c promoted endothelial cell motility, growth and survival via activation both PI3K/AKT/mTOR and p38 MAPK pathways as well as HIF-1-VEGF axis. It is apparent that Pt5-1c is a novel candidate of pro-angiogenic agents for vascular regenerative therapy.