Publication
Title
High-fluence accelerated PACK-CXL for bacterial keratitis using riboflavin/UV-A or rose bengal/green in the ex vivo porcine cornea
Author
Abstract
Purpose: To investigate and compare the efficacy of high-fluence accelerated photoactivated chromophore for keratitis-corneal cross-linking (PACK-CXL) using either riboflavin/ultraviolet (UV)-A light or rose bengal/green light to treat Staphylococcus aureus or Pseudomonas aeruginosa infections in an ex vivo porcine cornea model. Methods: One hundred and seventeen ex vivo porcine corneas were injected with clinical isolates of S. aureus or P. aeruginosa, divided into eight groups, and cultured for 24 hours. Then, either riboflavin with UV-A light irradiation (30 mW/cm(2); 8 minutes, 20 seconds; 15 J/cm(2)) or rose bengal with green light irradiation (15 mW/cm(2), 16 minutes, 40 seconds; 15 J/cm(2)) was applied; unirradiated infected groups served as controls. All corneas were incubated for another 24 hours. Next, corneal buttons were obtained and vortexed to release the bacterial cells. The irradiated and unirradiated solutions were then plated and incubated on agar plates. The amount of colony-forming units was quantified and the bacterial killing ratios (BKRs) resulting from different PACK-CXL protocols relative to non-treated controls were calculated. Results: Riboflavin/UV-A light PACK-CXL resulted in median BKRs of 52.8% and 45.8% in S. aureus and P. aeruginosa, respectively, whereas rose bengal/green light PACK-CXL resulted in significantly greater BKRs of 76.7% and 81.0%, respectively (both P < 0.01). Conclusions: Both accelerated PACK-CXL protocols significantly decreased S. aureus and P. aeruginosa bacterial loads. Comparing the riboflavin/UV-Alight and rose bengal/green light PACK-CXL approaches in the same experimental setup may help develop strain-specific and depth-dependent PACK-CXL approaches that could be used alongside the current standard of care. Translational Relevance: Our study used an animal model to gain insight into the efficacy of high-fluence accelerated PACK-CXL using either riboflavin/UV-A light or rose bengal/green light to treat Staphylococcus aureus or Pseudomonas aeruginosa infections.
Language
English
Source (journal)
Translational vision science & technology / Association for Research in Vision and Ophthalmology [Rockville, Md] - Rockville, Md, 2012, currens
Publication
Rockville, Md : Association for Research in Vision and Ophthalmology , 2023
ISSN
2164-2591
DOI
10.1167/TVST.12.9.14
Volume/pages
12 :9 (2023) , p. 1-7
Article Reference
14
ISI
001103195600014
Pubmed ID
37738058
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 04.12.2023
Last edited 07.12.2023
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