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Effect of C3 depletion on experimental Pseudomonas aeruginosa ocular infection: histopathological analysis
Abstract:
The ocular histopathological response of C3-depleted and normal DBA/2J mice was compared after corneal scarification and experimental infection with topically applied Pseudomonas aeruginosa. Normal, non-C3-depleted mice were capable of mounting a vigorous polymorphonuclear leukocyte response at 24 h after bacterial challenge and eventually restored corneal clarity. In contrast, C3-depleted animals responded at 24 h to the ocular bacterial challenge with a decreased number of polymorphonuclear leukocytes migrating into the cornea. Additionally, the eyes of C3-depleted mice exhibited persistence of bacteria, cataract of the ocular lens, and loss of vision.
Insights
Complement component 3 (C3) depletion impairs the immune response to Pseudomonas aeruginosa eye infections in mice. C3-depleted mice showed reduced white blood cell migration, persistent bacteria, and vision loss.
Area of Science:
- Ophthalmology
- Immunology
- Microbiology
Background:
- The complement system, particularly complement component 3 (C3), plays a crucial role in innate immunity.
- Pseudomonas aeruginosa is a common opportunistic pathogen that can cause severe ocular infections.
Purpose of the Study:
- To investigate the role of C3 in the ocular immune response to Pseudomonas aeruginosa infection.
- To compare the histopathological outcomes in C3-depleted versus normal DBA/2J mice.
Main Methods:
- Corneal scarification followed by topical application of Pseudomonas aeruginosa in DBA/2J mice.
- Comparison of ocular immune cell infiltration (polymorphonuclear leukocytes) at 24 hours post-infection.
- Assessment of bacterial persistence, cataract formation, and vision.
Main Results:
- Normal mice exhibited a robust polymorphonuclear leukocyte response and restored corneal clarity.
- C3-depleted mice showed significantly reduced polymorphonuclear leukocyte migration into the cornea.
- C3-depleted mice experienced persistent bacterial infection, cataract development, and vision loss.
Conclusions:
- C3 is essential for an effective early immune response against Pseudomonas aeruginosa keratitis.
- C3 deficiency leads to severe ocular pathology and impaired vision during bacterial eye infections.