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Monoclonal antibodies provide protection against ocular Pseudomonas aeruginosa infection
M M Moon1, L D Hazlett, R E Hancock
1Department of Anatomy/Cell Biology, Wayne State University School of Medicine, Detroit, Michigan 48201.
Abstract:
A panel of well characterized monoclonal antibodies (MAbs) directed against outer membrane proteins H2, or F (porin) of Pseudomonas aeruginosa were examined to determine whether they exhibited any protective effect against subsequent ocular challenge with the bacteria topically applied to the scarified corneal surface. Mice were observed macroscopically following bacterial challenge and the degree of ocular disease graded on a scale of 0 to 4 (0, normal, fully protected cornea; 4, corneal perforation or phthisis, not protected). Mice treated intravenously with either MAb MA1-6 (anti-H2) or MA2-10 (anti-F), or a combination of these two MAbs and MAb MA4-4 (anti-F), two hours before corneal challenge with the viable bacteria, exhibited significantly less corneal disease than mice either not treated with the MAbs, treated with MA4-4 alone or treated with MAb MA1-3 (anti-I). The latter MAb is directed against an outer membrane epitope that is not surface exposed. Light and transmission electron microscopic histopathology also was employed and provided confirmatory evidence to support the macroscopic analyses.
Insights
Monoclonal antibodies (MAbs) targeting Pseudomonas aeruginosa outer membrane proteins H2 and F provided significant protection against ocular infection in mice. These findings highlight potential therapeutic strategies for bacterial keratitis.
Area of Science:
- Ophthalmology
- Microbiology
- Immunology
Background:
- Pseudomonas aeruginosa is a leading cause of bacterial keratitis.
- Outer membrane proteins are key targets for therapeutic interventions.
- Monoclonal antibodies (MAbs) offer specific targeting capabilities.
Purpose of the Study:
- To evaluate the protective efficacy of MAbs against P. aeruginosa ocular challenge.
- To investigate the role of specific outer membrane proteins (H2, F) in ocular infections.
- To assess the therapeutic potential of anti-P. aeruginosa MAbs.
Main Methods:
- Mice were challenged ocularly with P. aeruginosa after intravenous MAb treatment.
- Ocular disease severity was graded macroscopically (0-4 scale).
- Histopathological analysis using light and transmission electron microscopy confirmed findings.
Main Results:
- MAbs targeting H2 (MA1-6) and F (MA2-10) significantly reduced corneal disease.
- A combination of anti-H2 and anti-F MAbs demonstrated protective effects.
- MAbs targeting non-surface-exposed epitopes (anti-I) showed no protective effect.
Conclusions:
- MAbs targeting surface-exposed outer membrane proteins H2 and F are effective in preventing P. aeruginosa-induced keratitis.
- This study supports the development of MAb-based therapies for bacterial eye infections.
- Targeting specific outer membrane proteins offers a promising avenue for P. aeruginosa infection treatment.