Related Experiment Videos
Iron as a replacement for mucin in the establishment of meningococcal infection in mice
Abstract:
Experimental infection of mice with Neisseria meningitidis was established by the injection of the bacteria suspended in solutions of various iron compounds. The progressive and fatal infection caused by otherwise non-lethal doses of organisms was produced in these mice after prior injection with ferrous sulphate or concomitant injection with iron sorbitol citrate or iron dextran. Reduction in LD50 to levels at least comparable to those obtained in the mucin challenge system was achieved; in some serogroups of N. meningitidis the LD50 was decreased more than a million fold. The results suggest that iron, which is a component of hog gastric mucin, is a factor involved in the establishment of meningococcal infection in mice. Use of iron compounds as injection medium offers a more advantageous system than mucin, since controlled administration of chemically defined substances occurs.
Insights
Iron supplementation enhances the lethality of Neisseria meningitidis infections in mice. This study demonstrates iron
Area of Science:
- Microbiology
- Immunology
- Pathogen-Host Interactions
Background:
- Neisseria meningitidis is a significant human pathogen.
- Iron is essential for bacterial growth and virulence.
- Previous studies utilized mucin to enhance experimental infections.
Purpose of the Study:
- To investigate the role of iron compounds in establishing experimental Neisseria meningitidis infections in mice.
- To evaluate iron compounds as an alternative to mucin for infection models.
Main Methods:
- Mice were experimentally infected with Neisseria meningitidis.
- Bacteria were suspended in solutions containing ferrous sulphate, iron sorbitol citrate, or iron dextran.
- The lethal dose 50 (LD50) was determined and compared to mucin-based models.
Main Results:
- Iron compounds significantly increased the fatality of otherwise non-lethal bacterial doses.
- LD50 values were reduced dramatically, comparable to or exceeding mucin challenge systems.
- Specific Neisseria meningitidis serogroups showed over a million-fold decrease in LD50.
Conclusions:
- Iron is a critical factor in the establishment of Neisseria meningitidis infection in a murine model.
- Iron compounds provide a controlled and advantageous system for experimental meningococcal infection studies compared to mucin.