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8-methoxypsoralen and the eye
Archives of Dermatological Research
|January 1, 1981
Summary
Radiolabeled 8-methoxypsoralen migrated slowly into human cataract lenses. Lower concentrations were found in aqueous humor than serum, suggesting less rigorous sunglass use may be acceptable.
Area of Science:
- Ophthalmology
- Dermatology
- Pharmacokinetics
Background:
- 8-methoxypsoralen (8-MOP) is a photosensitizing agent used in PUVA therapy.
- Cataract formation is a concern with long-term psoralen use.
- Understanding 8-MOP migration into the lens is crucial for patient safety.
Purpose of the Study:
- To investigate the kinetics of radiolabeled 8-methoxypsoralen (8-MOP) migration into human cataract lenses.
- To determine 8-MOP concentrations in the aqueous humor and serum over time.
Main Methods:
- 12 patients undergoing cataract surgery participated.
- Tritiated 8-methoxypsoralen was administered orally.
- Lens, aqueous humor, and serum samples were analyzed for radioactivity at various time points (2.5-72 hours post-intake).
Main Results:
- Detectable levels of 8-MOP were found in only 2 out of 3 lenses examined 24 hours after intake.
- 8-MOP concentrations in the aqueous humor were consistently lower than in serum.
- Slow migration of 8-MOP into the lens tissue was observed.
Conclusions:
- The slow uptake of 8-MOP into human cataract lenses suggests limited risk of acute phototoxicity.
- Lower 8-MOP levels in aqueous humor compared to serum indicate reduced ocular exposure.
- Findings may support a less stringent photoprotection regimen than currently recommended by some PUVA centers.