(+)-Catechin prevents ultraviolet B-induced human keratinocyte death via inhibition of JNK phosphorylation
- 29 March 2006
- journal article
- Published by Elsevier BV in Life Sciences
- Vol. 79 (8), 801-807
- https://doi.org/10.1016/j.lfs.2006.02.028
Abstract
High levels of (+)-catechin are found in the skin and seed of many fruits such as apples and grapes. Dietary supplementation with (+)-catechin has been demonstrated to protect epidermal cells against damage induced by ultraviolet B (UVB) radiation. However, the underlying mechanisms are not well understood yet. To determine whether (+)-catechin protects keratinocytes from UVB-induced damage, the viability of UVB- and H2O2-treated cells was determined by cell viability assay. Intracellular H2O2 level was measured by flow cytometry. UVB- or H2O2-induced signaling pathways were detected by Western blotting. The results indicated that (+)-catechin inhibited UVB- and H2O2-induced keratinocyte death. In parallel, intracellular H2O2 generation in keratinocytes irradiated by UVB was inhibited by (+)-catechin in a concentration-dependent manner. (+)-Catechin also inhibited UVB- and H2O2-induced JNK activation in keratinocytes. However, it had little inhibitory effect on UVB- and H2O2-induced ERK and p38 activation even at a higher concentration, suggesting indirectly that JNK activation is required for the induction of apoptosis in keratinocytes exposed to UVB. Finally, we compared the cytotoxicity of (+)-catechin and (−)-epigallocatechin-3-gallate (EGCG) on keratinocytes. Cell viability assay showed that (+)-catechin was relatively nontoxic at higher doses. Taken together, our results demonstrate that (+)-catechin inhibits UVB- and oxidative stress-induced H2O2 production and JNK activation and enhances human keratinocyte survival. However, although it seems that (+)-catechin and EGCG are equally effective in preventing keratinocyte death, (+)-catechin is relatively nontoxic and thus is suitable for developing as an anti-ageing agent for skin care.Keywords
This publication has 36 references indexed in Scilit:
- Protective effect of vitamin E on ultraviolet B light–induced damage in keratinocytesMolecular Carcinogenesis, 2002
- Inhibition of UVB-Induced Oxidative Stress-Mediated Phosphorylation of Mitogen-Activated Protein Kinase Signaling Pathways in Cultured Human Epidermal Keratinocytes by Green Tea Polyphenol (−)-Epigallocatechin-3-gallateToxicology and Applied Pharmacology, 2001
- UVA Radiation Stimulates Ceramide Production: Relationship to Oxidative Stress and Potential Role in ERK, JNK, and p38 ActivationBiochemical and Biophysical Research Communications, 2001
- p38 Mitogen-activated Protein Kinase Regulates a Novel, Caspase-independent Pathway for the Mitochondrial Cytochromec Release in Ultraviolet B Radiation-induced ApoptosisJournal of Biological Chemistry, 2000
- Activation of Mitogen-activated Protein Kinase by H2O2Published by Elsevier BV ,1996
- Topical vitamin e inhibition of immunosuppression and tumorigenesis induced by ultraviolet irradiationNutrition and Cancer, 1991
- MOLECULAR MECHANISMS OF ULTRAVIOLET RADIATION CARCINOGENESISPhotochemistry and Photobiology, 1990
- CAROTENOIDS AFFECT DEVELOPMENT OF UV‐B INDUCED SKIN CANCERPhotochemistry and Photobiology, 1987
- Selenium inhibits UV-light-induced skin carcinogenesis in hairless mice☆Cancer Letters, 1985
- Suppression Of Ultraviolet Light-Induced Tumor Formation By Dietary AntioxidantsJournal of Investigative Dermatology, 1975