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Thiols as potential UV radiation protectors: an in vitro study
L T van den Broeke1, G M Beyersbergen van Henegouwen
1Department of Medicinal Chemistry, Leiden University, Netherlands.
Journal of Photochemistry and Photobiology. B, Biology
|March 1, 1993
Summary
This study investigated thiol compounds for UV protection. Thiols effectively inhibited the photobinding of drugs like chlorpromazine and 8-methoxypsoralen to DNA and proteins, demonstrating significant protective properties against UV radiation.
Area of Science:
- Photochemistry
- Biochemistry
- Dermatology
Background:
- UV radiation exposure can lead to photodamage through phototoxic drug interactions.
- Certain thiol compounds possess antioxidant properties that may mitigate UV-induced damage.
Purpose of the Study:
- To evaluate the UV-protective potential of various thiol compounds.
- To assess the ability of thiols to inhibit the photobinding of chlorpromazine (CPZ) and 8-methoxypsoralen (8-MOP) to biomacromolecules.
Main Methods:
- Investigated seven thiols: captopril, cysteamine, ergothioneine, mesna, mercaptopropionylglycine, N-acetylcysteine, and penicillamine.
- Measured inhibition of in vitro photobinding of CPZ and 8-MOP to protein (human serum albumin) and DNA.
- Quantified CPZ photodegradation and the formation of its metabolites (PZH, PZOH).
Main Results:
- All tested thiols significantly inhibited CPZ photobinding to DNA (21-100%) and albumin (17-87%).
- Thiols enhanced CPZ photodegradation (19-84%) and reduced the PZOH/PZH ratio (90-97%).
- 8-MOP photobinding to albumin was strongly inhibited (75-96%), but less so to DNA (2-41%).
Conclusions:
- Thiols exhibit potent UV-protective properties by interfering with phototoxic drug interactions.
- Mechanisms likely involve scavenging reactive species, quenching singlet oxygen, and reacting with excited states.
- These findings highlight the potential therapeutic applications of thiols in managing UV-related photodamage.