ArticleTranslational vision science & technology2025
Corneal Resistance to Enzymatic Digestion After Rose Bengal and Combined Rose Bengal/Riboflavin Cross-Linking Is Oxygen Independent.
Article in Translational vision science & technology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Purpose: To assess corneal resistance to enzymatic digestion after rose bengal (RB)/green light and RB/green light followed by riboflavin (RF)/ultraviolet A (UV-A) cross-linking (CXL), with or without oxygen. Methods: Ex vivo porcine corneal buttons (n = 144) underwent CXL with RB/green or RB/green-RF/UV-A under atmospheric 21% oxygen conditions or in a nitrogen chamber with 0.1% oxygen (hypoxic conditions) to test 10- and 15-J/cm2 fluences. After CXL, corneas were digested with 0.3% collagenase A, and mean digestion times (MDTs) were recorded. Results: For the non-irradiated control group, the MDT was 19.75 ± 1.34 hours. Under atmospheric oxygen conditions, RB/green CXL yielded MDTs of 33.69 ± 1.4 and 34.38 ± 1.31 hours with fluences of 10 and 15 J/cm2, respectively. RB/green + RF/UV-A showed MDTs of 39.56 ± 1.93 and 51.94 ± 4.2 hours for combined fluences of 10 + 10 J/cm2 and 15 + 15 J/cm2, respectively. Hypoxic RB/green MDTs were 33.88 ± 1.02 and 34.06 ± 1.57 hours, and RB/green + RF/UV-A MDTs were 39.62 ± 2.5 and 50.35 ± 1.59 hours for the same respective fluences. No significant differences were observed between the control groups and corresponding intervention groups (all P > 0.05). Conclusions: CXL via RB/green and RB/green-RF/UV-A significantly enhanced corneal collagenase digestion resistance, irrespective of oxygen presence. These findings could help optimize infectious keratitis therapy CXL protocols. Translational Relevance: Our findings aid the understanding of the molecular mechanisms underlying the therapeutic effect of CXL and may contribute to refining accelerated PACK-CXL protocols and other CXL treatment strategies.
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