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Indirect evidence of cell wall alterations in Pseudomonas aeruginosa by immunoglobulin preparations
Abstract:
Ten strains of Pseudomonas aeruginosa isolated from different clinical sources were incubated with immunoglobulin preparations for i.v. use. This resulted in the release of beta-lactamases normally cell-bound in the periplasmic space. The amount of released beta-lactamases - depending on the degree of cell wall alteration - was spectrophotometrically determined by the use of nitrocefin as an indicator substance. beta-lactamase release varies according to strain specificity and depends on the chemical modification of the immunoglobulins used.
Insights
Immunoglobulin preparations induced the release of cell-bound beta-lactamases in Pseudomonas aeruginosa. This release varied by bacterial strain and immunoglobulin modification, impacting enzyme accessibility.
Area of Science:
- Microbiology
- Biochemistry
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen.
- Beta-lactamases are enzymes that hydrolyze beta-lactam antibiotics.
- These enzymes are often located in the periplasmic space, limiting their accessibility.
Purpose of the Study:
- To investigate the effect of immunoglobulin preparations on beta-lactamase release from Pseudomonas aeruginosa.
- To determine if immunoglobulin modification influences this release.
Main Methods:
- Ten clinical isolates of Pseudomonas aeruginosa were incubated with immunoglobulin preparations.
- Beta-lactamase release was quantified spectrophotometrically using nitrocefin.
- Cell wall alteration was assessed as a factor in enzyme release.
Main Results:
- Incubation with immunoglobulin preparations led to the release of cell-bound beta-lactamases.
- The extent of beta-lactamase release correlated with the degree of cell wall alteration.
- Strain specificity and chemical modification of immunoglobulins significantly influenced beta-lactamase release.
Conclusions:
- Immunoglobulin preparations can induce the release of periplasmic beta-lactamases in Pseudomonas aeruginosa.
- This phenomenon is strain-dependent and influenced by immunoglobulin modifications.
- Understanding this interaction may have implications for antibiotic resistance and therapeutic strategies.