Therapeutic Potential of an Endolysin Derived from Kayvirus S25-3 for Staphylococcal Impetigo

Viruses. 2019 Aug 22;11(9):769. doi: 10.3390/v11090769.

Abstract

Impetigo is a contagious skin infection predominantly caused by Staphylococcus aureus. Decontamination of S. aureus from the skin is becoming more difficult because of the emergence of antibiotic-resistant strains. Bacteriophage endolysins are less likely to invoke resistance and can eliminate the target bacteria without disturbance of the normal microflora. In this study, we investigated the therapeutic potential of a recombinant endolysin derived from kayvirus S25-3 against staphylococcal impetigo in an experimental setting. First, the recombinant S25-3 endolysin required an incubation period of over 15 minutes to exhibit efficient bactericidal effects against S. aureus. Second, topical application of the recombinant S25-3 endolysin decreased the number of intraepidermal staphylococci and the size of pustules in an experimental mouse model of impetigo. Third, treatment with the recombinant S25-3 endolysin increased the diversity of the skin microbiota in the same mice. Finally, we revealed the genus-specific bacteriolytic effect of recombinant S25-3 endolysin against staphylococci, particularly S. aureus, among human skin commensal bacteria. Therefore, topical treatment with recombinant S25-3 endolysin can be a promising disease management procedure for staphylococcal impetigo by efficient bacteriolysis of S. aureus while improving the cutaneous bacterial microflora.

Keywords: Staphylococcus aureus; bacteriophage; cutaneous microbiome; endolysin; impetigo; kayvirus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Cutaneous
  • Animals
  • Anti-Bacterial Agents / administration & dosage
  • Anti-Bacterial Agents / pharmacology
  • Bacteriolysis
  • Caudovirales / metabolism*
  • Caudovirales / pathogenicity
  • Endopeptidases / administration & dosage
  • Endopeptidases / genetics
  • Endopeptidases / pharmacology*
  • Genes, Bacterial
  • Genes, Viral
  • Impetigo / drug therapy*
  • Impetigo / microbiology
  • Metagenomics
  • Mice
  • Microbiota / genetics
  • Pseudomonas aeruginosa / virology
  • RNA, Ribosomal, 16S
  • Recombinant Proteins / administration & dosage
  • Recombinant Proteins / pharmacology
  • Skin / microbiology
  • Skin / pathology
  • Staphylococcal Infections / drug therapy
  • Staphylococcus Phages / metabolism
  • Staphylococcus Phages / pathogenicity
  • Staphylococcus aureus* / drug effects
  • Staphylococcus aureus* / virology
  • Staphylococcus epidermidis / virology
  • Streptococcus mitis / virology

Substances

  • Anti-Bacterial Agents
  • RNA, Ribosomal, 16S
  • Recombinant Proteins
  • Endopeptidases
  • endolysin