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Published on: January 6, 2018
Initial studies using aliphatic beta-nitro alcohols for therapeutic corneal cross-linking
David C Paik1, Quan Wen, Richard E Braunstein
1Department of Ophthalmology, Edward S Harkness Eye Institute, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA.
Investigative Ophthalmology & Visual Science
|October 7, 2008
Summary
New beta-nitro alcohols show promise as topical stiffening agents for keratoconus, offering better corneal cross-linking than UV-A riboflavin (UVAR) with minimal impact on light transmission.
Area of Science:
- Ophthalmology
- Biochemistry
- Materials Science
Background:
- Corneal collagen cross-linking is crucial for treating keratoconus and related conditions.
- Current standard treatment involves UVA-riboflavin photochemistry (UVAR).
- Recent research indicates beta-nitro alcohols can cross-link collagen under physiological conditions.
Purpose of the Study:
- To evaluate short-chain aliphatic beta-nitro alcohols as potential pharmacologic alternatives to UVAR for corneal stiffening.
- To assess their efficacy in cross-linking corneal tissue in vitro.
- To compare their performance against the established UVAR method.
Main Methods:
- Porcine corneal strips and corneoscleral complexes were treated with 2-nitroethanol (2ne), 2-nitro-1-propanol (2nprop), and 3-nitro-2-pentanol (3n2pent) at varying concentrations and durations.
- Cross-linking efficacy was measured by thermal shrinkage temperature analysis (T(i)).
- Corneal light transmission in the blue light spectrum (400-500 nm) was assessed using spectrophotometry.
Main Results:
- Beta-nitro alcohols significantly increased the initial shrinkage temperature (T(i)), indicating enhanced collagen cross-linking.
- At 100 mM, 2ne shifted T(i) by 9.8°C, while 2nprop and 3n2pent shifted it by 4.9°C.
- These compounds demonstrated superior cross-linking compared to UVAR (1.9°C shift).
- 2nprop and 3n2pent showed negligible impact on light transmission, unlike 2ne which caused a 5.6% decrease.
Conclusions:
- Beta-nitro alcohols effectively induce corneal cross-linking in vitro, surpassing the efficacy of UVAR.
- These agents offer a promising, potentially less invasive, topical alternative for managing keratoconus and similar disorders.
- Further investigation is warranted to explore their clinical applicability as corneal stiffening agents.
