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Related Experiment Videos

Characterization of the mouse beta defensin 1, Defb1, mutant mouse model.

Gillian Morrison1, Fiona Kilanowski, Donald Davidson

  • 1MRC Human Genetics Unit, Western General Hospital, Edinburgh, EH4 2XU, Scotland.

Infection and Immunity
|May 16, 2002
PubMed
Summary

Beta defensins are key antimicrobial peptides. Deficient mice showed impaired Staphylococcus aureus clearance but enhanced resistance to urinary tract infections.

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Area of Science:

  • Immunology
  • Microbiology
  • Genetics

Background:

  • Beta-defensins are cationic antimicrobial peptides in the respiratory system.
  • Dysfunctional beta-defensins are implicated in cystic fibrosis lung environments.
  • Defb1 is a murine homologue to human beta-defensins, expressed in the respiratory system.

Purpose of the Study:

  • To investigate the in vivo function of beta-defensins using gene targeting.
  • To generate and analyze Defb1-deficient (Defb1(-/-)) mice.

Main Methods:

  • Gene targeting was employed to create Defb1(-/-) mice.
  • Antimicrobial activity of synthetic Defb1 peptide was assessed against various bacteria.
  • Clearance of Staphylococcus aureus from airways and bacterial presence in the bladder were evaluated in Defb1(-/-) mice.

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Main Results:

  • Defb1 peptide exhibited salt-sensitive antimicrobial activity, stronger against Staphylococcus aureus than E. coli or Pseudomonas aeruginosa.
  • Defb1(-/-) mice were effective in clearing Staphylococcus aureus from airways post-nebulization.
  • A significantly higher prevalence of Staphylococcus species in the bladders of Defb1(-/-) mice was observed compared to controls.

Conclusions:

  • Defb1 plays a role in airway clearance of Staphylococcus aureus.
  • Defb1(-/-) mice suggest a role for beta-defensins in resistance to urinary tract infections.
  • While not exhibiting overt deleterious phenotypes, Defb1 deficiency impacts bacterial resistance.