[Purification and identification of antimicrobial peptides of rabbit neutrophils]

Hua Xi Yi Ke Da Xue Xue Bao. 1990 Mar;21(1):59-62.
[Article in Chinese]

Abstract

Five antimicrobial peptides were extracted from the cytoplasmic granules of rabbit neutrophils with 0.01 mol/L citric acid. SDS-PAGE gel densitometric analysis of the citric acid extract showed that they accounted for 34%-42% of the total extract proteins. When subjected to acid urea polyacrylamide gel electrophoresis, five peptides migrated much further to the cathode than lysozyme. Beginning with the most cathodal component, they were in turn referred to as NP1, NP2, NP3, NP4, and NP5. They were purified from the citric acid extract by virtue of preparative polyacrylamide gel electrophoresis. Each of them was of low molecular weight (2,500-6,000) as determined by SDS-PAGE. Three of the peptides were tested in vitro for fungicidal activity. When Candida albicans (10(7)/ml) were incubated with 12.5 micrograms/ml of NP1 or NP2 at 37 degrees C for 2 h, the death rates of the organisms were 96.6% and 93.3% respectively. NP3 was shown to be active against Candida albicans although less potent than NP1 and NP2.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antifungal Agents*
  • Candida albicans / drug effects
  • Electrophoresis, Polyacrylamide Gel
  • Neutrophils / analysis*
  • Peptides / isolation & purification
  • Peptides / pharmacology
  • Rabbits

Substances

  • Antifungal Agents
  • Peptides