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A 1.5 Hour Procedure for Identification of Enterococcus Species Directly from Blood Cultures
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Immunological responses against vancomycin-resistant Enterococcus faecium and Enterococcus faecalis by mice.

Yun Sang Cho1, Mun Han Lee2, Jong Man Kim1

  • 1a Bacterial Disease Division, Animal and Plant Disease Research Department , Animal and Plant Quarantine Agency , Gimcheon , Gyeongsangbuk-do , Republic of Korea.

Journal of Immunoassay & Immunochemistry
|January 9, 2018
PubMed
Summary

Researchers identified specific proteins from vancomycin-resistant Enterococcus (VRE) strains that trigger an immune response in mice. These immunogenic VRE proteins could aid in developing new diagnostic tools and treatments for VRE infections.

Keywords:
VanAVanBVancomycin-resistant enterococcicell envelope proteincytoplasmic proteinimmunologic response

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Area of Science:

  • Microbiology
  • Immunology
  • Infectious Diseases

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) treatment relies solely on vancomycin.
  • Vancomycin-resistant Enterococcus (VRE) poses a significant public health threat as MRSA can acquire vancomycin resistance.
  • Current diagnostic tools for VRE are limited, despite extensive research on their microbiology and genetics.

Purpose of the Study:

  • To identify immunogenic proteins from VanA and VanB classes of VRE.
  • To explore potential targets for serological diagnostic tools and immunotherapeutic VRE antibodies.

Main Methods:

  • Mice were orally infected with VanA (E. faecium) or VanB (E. faecalis) strains.
  • Proteins were separated using SDS-PAGE and identified via Western blot analysis.
  • Serological immune responses to specific VRE proteins were analyzed post-infection.

Main Results:

  • VanA infection elicited immune responses to 27 and 65 kDa cell envelope (CE) proteins at 1 week post-infection (wpi), and a 100 kDa cytoplasmic protein (CP) at 2-4 wpi.
  • VanB infection induced responses to 70 kDa CE protein (1-4 wpi), 25 and 35 kDa CE proteins (3-4 wpi), 79 kDa CE protein (4 wpi), and a 39 kDa CP (3 wpi).

Conclusions:

  • Specific immunogenic proteins from VanA and VanB VRE strains have been identified.
  • These identified proteins show potential for developing novel serological diagnostic methods for VRE.
  • The findings may facilitate the production of VRE-specific immunotherapeutic antibodies.