Treatment with 100 μg/mL cis-Urocanic acid (cis-UCA) completely suppresses IL-6 and IL-8 secretion, decreases caspase-3 activity, and improves cell viability against UV-B irradiation. No significant effects on IL-6 or IL-8 secretion, caspase-3 activity, or viability of the non-irradiated cells are observed with 100 μg/mL cis-Urocanic acid in both cell types. The 5000 μg/mL concentration is toxic[1]. Cell Viability Assay[1] Cell Line: Human corneal epithelial cells (HCE-2) and human conjunctival epithelial cells (HCECs) Concentration: 10, 100, 1,000, and 5,000 μg/mL Incubation Time: 24, 48, or 72 hours Result: Treatment with 100 μg/mL completely suppressed IL-6 and IL-8 secretion, decreased caspase-3 activity, and improved cell viability against UV-B irradiation. No significant effects on IL-6 or IL-8 secretion, caspase-3 activity, or viability of the non-irradiated cells were observed with 100 μg/mL in both cell types.
Kinase Assay
Cell Assay
Animal Administration
References
[1]. Walterscheid JP, et al. Cis-urocanic acid, a sunlight-induced immunosuppressive factor, activates immune suppression via the 5-HT2A receptor. Proc Natl Acad Sci U S A. 2006 Nov 14;103(46):17420-5.
[2]. Viiri J, et al. Cis-urocanic acid suppresses UV-B-induced interleukin-6 and -8 secretion and cytotoxicity in human corneal and conjunctival epithelial cells in vitro. Mol Vis. 2009 Sep 8;15:1799-805.
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