February 2026 in “UiTM Institutional Repositories (Universiti Teknologi MARA)” This study investigates the metabolic pathway of cis-urocanic acid (cis-UCA) upon UVB exposure, using NMR spectroscopy, molecular docking, and cell viability assays with human keratinocytes (HaCaT). The research reveals that cis-UCA can react with reactive sulphur species (RSS) donors without the involvement of the glutathione-S-transferase (GST) enzyme, leading to the formation of a new compound, 4-imidazoleacrylic acid-3-thiol. The study also finds that the formation of glutathione and cysteine conjugates can occur non-enzymatically, challenging the previously proposed GST-dependent pathway. Molecular docking shows that the glutathione conjugate has a higher binding affinity with GST than sulforaphane, suggesting a regulatory role. In vitro studies demonstrate that UVB exposure with cis-UCA reduces cell viability, but the presence of sulphide donors mitigates this toxicity, highlighting their protective role. This research provides new insights into cis-UCA metabolism and suggests an alternative RSS-driven pathway, impacting our understanding of UCA's role in UVB-induced skin reactions.
2 citations
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August 2019 in “BMC Complementary and Alternative Medicine” Asiasari radix extract may be a potential treatment for melanoma because it selectively triggers cell death in melanoma cells by affecting p53 regulation.
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February 2003 in “The journal of investigative dermatology/Journal of investigative dermatology” An enzyme other than TNAP might be responsible for vitamin B-6 metabolism in the skin.
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November 2012 in “SLAS discovery” Some herbal extracts can promote hair growth and prevent hair loss.
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January 2003 in “Skin pharmacology and physiology” Melatonin affects skin cell growth differently based on how much and how long it's used.