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An integrin-activating peptide, PHSRN, ameliorates inhibitory effects of conventional peritoneal dialysis fluids on

Tetsu Miyamoto1, Masahito Tamura, Narutoshi Kabashima

  • 1Second Department of Internal Medicine, University of Occupational and Environmental Health School of Medicine, Kitakyushu, Japan.

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
|November 21, 2009
PubMed
Abstract

Insights

The Pro-His-Ser-Arg-Asn (PHSRN) peptide promotes peritoneal membrane regeneration in dialysis patients. PHSRN counteracts harmful effects of dialysis fluids, improving wound healing and reducing fibrosis.

Area of Science:

  • Regenerative Medicine
  • Cell Biology
  • Nephrology

Background:

  • Peritoneal dialysis fluids (PDFs) can cause pathological changes, including membrane dysfunction and fibrosis.
  • Fibronectin cell-binding domains, like Pro-His-Ser-Arg-Asn (PHSRN) peptide, are known to activate integrins and aid wound healing.

Purpose of the Study:

  • To investigate the therapeutic potential of PHSRN peptide in mitigating peritoneal membrane damage caused by PDFs.
  • To assess the impact of PHSRN on peritoneal remodelling in a rat model of peritoneal dialysis.

Main Methods:

  • A rat model with a stripped peritoneal mesothelial monolayer received PDFs with or without PHSRN or a control peptide (HSPNR).
  • Effects on cell motility and signaling were analyzed in cultured rat peritoneal mesothelial cells (RPMCs) and fibroblasts (NRKs).

Main Results:

  • PHSRN significantly improved mesothelial regeneration compared to PDFs alone, restoring it to control levels.
  • PDFs increased submesothelial tissue thickening and inflammatory cell infiltration, effects ameliorated by PHSRN.
  • PHSRN reversed PDF-induced inhibition of cell motility and focal adhesion kinase signaling in RPMCs and NRKs.

Conclusions:

  • PHSRN peptide demonstrates beneficial effects on peritoneal regeneration and wound healing.
  • PHSRN counteracts the detrimental effects of conventional PDFs on integrin-mediated healing processes.

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