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[Hyaluronidase in meningococcus]
Abstract:
A total of 204 meningococcus strains were tested for the presence of hyaluronidase, and 45.5% of the strains were found to contain it. Strains penetrating into the cerebrospinal fluid were the ones which largely produced the enzyme (in 83% of the cases). The enzyme was revealed only in 25.5% of the strains habituating on the nasopharyngeal mucosa. Hyaluronidase was mostly found in the meningococcus strains referred to the serological group A; strains of other serological groups and ungrouped strains produced the enzyme in 23.7% of the case only. There was no correlation between the capacity to form hyaluronidase and the virulence determinable in intraperitoneal infection of mice.
Insights
Most meningococcus strains contain hyaluronidase, an enzyme crucial for cerebrospinal fluid invasion. This enzyme was more prevalent in invasive strains and serogroup A, but not linked to mouse virulence.
Area of Science:
- Microbiology
- Enzymology
- Pathogenesis
Background:
- Neisseria meningitidis (meningococcus) is a significant human pathogen.
- Hyaluronidase is an enzyme implicated in bacterial invasion and spread.
- Understanding meningococcal enzyme production is key to deciphering pathogenesis.
Purpose of the Study:
- To investigate the prevalence of hyaluronidase in meningococcus strains.
- To correlate hyaluronidase production with strain characteristics and invasiveness.
- To assess the relationship between hyaluronidase and virulence in a murine model.
Main Methods:
- Testing of 204 meningococcus isolates for hyaluronidase presence.
- Categorization of strains based on origin (cerebrospinal fluid vs. nasopharyngeal mucosa).
- Serogrouping of isolates and virulence assessment in mice.
Main Results:
- Hyaluronidase was detected in 45.5% of all tested meningococcus strains.
- Significantly higher prevalence (83%) in strains isolated from cerebrospinal fluid compared to nasopharyngeal strains (25.5%).
- Hyaluronidase was most common in serogroup A strains (higher than other groups).
Conclusions:
- Hyaluronidase production is associated with meningococcal invasiveness, particularly in strains reaching the cerebrospinal fluid.
- Serogroup A meningococci exhibit a higher capacity for hyaluronidase production.
- Hyaluronidase production in vitro does not correlate with virulence in a mouse model of infection.