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Complement-derived anaphylatoxins in human donor corneas treated with excimer laser
B P Gardner1, U Pleyer, B J Mondino
1Department of Ophthalmology, UCLA School of Medicine, USA.
Background And Objective:
An inflammatory response produced by excimer laser photorefractive keratectomy (PRK) may be associated with the subsequent corneal haze and regressions in refractive error observed after treatment. Complement-derived anaphylatoxins, potent mediators of inflammation, may have a role in postoperative healing.
Materials And Methods:
Twenty right human donor corneas underwent a 6-D excimer laser PRK treatment. The corresponding left donor corneas served as the controls. After incubation in tissue culture media for 6 hours and elution in phosphate-buffered saline with EDTA for 24 hours, complement-derived anaphylatoxins C3a, C4a, and C5a were measured in corneal eluates by radioimmunoassay.
Results:
Compared with control corneas, the excimer PRK corneas failed to demonstrate a significant increase in C3a, C4a, or C5a levels (P > .05).
Conclusions:
These results suggest that the excimer laser at this dose does not activate significant complement in the cornea.
Insights
Excimer laser photorefractive keratectomy (PRK) did not significantly increase complement anaphylatoxins in human corneas. This suggests the laser treatment, at this dose, does not trigger a significant inflammatory complement response post-surgery.
Area of Science:
- Ophthalmology
- Immunology
- Laser Surgery
Background:
- Post-photorefractive keratectomy (PRK) inflammation may cause corneal haze and refractive error regression.
- Complement-derived anaphylatoxins are potent inflammatory mediators implicated in wound healing.
Purpose of the Study:
- To investigate the role of complement activation in excimer laser PRK.
- To determine if specific complement anaphylatoxins (C3a, C4a, C5a) are elevated after PRK treatment.
Main Methods:
- Human donor corneas underwent a 6-diopter excimer laser PRK treatment.
- Control corneas were used for comparison.
- Corneal eluates were analyzed for C3a, C4a, and C5a levels using radioimmunoassay after incubation and elution.
Main Results:
- No significant increase in C3a, C4a, or C5a levels was observed in PRK-treated corneas compared to controls.
- Statistical analysis showed P > .05, indicating no significant difference.
Conclusions:
- The findings suggest that excimer laser treatment at the specified dose does not induce significant complement activation in the cornea.
- This implies that complement anaphylatoxins may not play a major role in the inflammatory response following this type of PRK procedure.