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Culture of Small Colony Variant of Pseudomonas aeruginosa and Quantitation of its Alginate
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Nonmucoid conversion of mucoid Pseudomonas aeruginosa induced by sulfate-stimulated growth

Kyung Bae Min1, Kang-Mu Lee, Young Taek Oh

  • 1Department of Microbiology and Immunology, Brain Korea PLUS Project for Medical Science, Seoul, Korea.

FEMS Microbiology Letters
|September 18, 2014
PubMed

Insights

Sulfate ions suppress alginate production in mucoid Pseudomonas aeruginosa, a key factor in cystic fibrosis lung infections. This finding offers a potential new strategy to combat these persistent bacterial infections.

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Drug Discovery

Background:

  • Mucoid Pseudomonas aeruginosa causes chronic cystic fibrosis (CF) infections and resists treatment due to alginate overproduction.
  • Alginate contributes to antibiotic resistance and immune evasion, prolonging infections.

Purpose of the Study:

  • To identify molecules that suppress alginate production in mucoid P. aeruginosa.
  • To explore novel therapeutic strategies for chronic P. aeruginosa infections in CF patients.

Main Methods:

  • Phenotype microarray screening to identify alginate suppressors.
  • Culturing mucoid P. aeruginosa strains with sulfate salts and measuring alginate production.
  • Assessing algD promoter activity using a reporter gene fusion.
  • Investigating the role of LPS biosynthesis via a lpxC mutant.

Main Results:

  • Sulfate ions significantly suppressed alginate production in mucoid P. aeruginosa isolates.
  • Sulfate treatment decreased algD promoter activity and altered bacterial cell shape.
  • A mutant defective in lipid A biosynthesis was resistant to sulfate-induced reversion.

Conclusions:

  • Sulfate ions represent a novel strategy to suppress alginate production in P. aeruginosa.
  • LPS biosynthesis may be involved in the sulfate-induced reversion to a nonmucoid phenotype.
  • This approach could lead to new treatments for persistent P. aeruginosa infections in CF.
Keywords:
Pseudomonas aeruginosaalginatemucoidnonmucoid reversionsulfate

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