title: Effect of epigallocatechingallate on ultraviolet B-induced photo-damage in keratinocyte cell line.
abstract: One type of traditional Chinese medicines, epigallocatechingallate (EGCG) has been commonly used as a clinical and skin health protective ingredient. It has been known to have photo-protective, anti-inflammatory, and anti-oxidant effects. However, little is known about the mechanisms of EGCG on UV-induced photo-aging and photo-carcinogenesis. In the present study, we investigated the photo-protective mechanisms of EGCG on UVB-induced skin damage, including the potency of EGCG to inhibit the UVB-induced cytotoxicity, secretion of cytokine (IL-6 and TNF-alpha), cellular apoptosis, expression of apoptosis-regulatory genes (p53-p21) and c-fos gene in cultured immortalized human keratinocyte HaCaT cells. EGCG treatment decreased UVB- induced cell cytotoxicity and apoptosis. It also inhibited the mRNA expressions of apoptosis-regulatory gene (p53 and p21) and c-fos gene. These results suggest that EGCG may have an inhibitory effect on UVB-induced photo-damage and apoptosis by blocking the cytokine secretion and the mRNA expressions of p53, p21 and c-fos genes.
authors.affiliation: Department of Dermatology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China. daniluo@yahoo.com
authors.forename: Dan
authors.initials: D
authors.lastname: Luo
authors.forename: Wei
authors.initials: W
authors.lastname: Min
authors.forename: Xiang-Fei
authors.initials: XF
authors.lastname: Lin
authors.forename: Di
authors.initials: D
authors.lastname: Wu
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.forename: Xu
authors.initials: X
authors.lastname: Miao
mesh_terms: D017209:Apoptosis / Q000187:drug effects / Q000528:radiation effects; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D015870:Gene Expression / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D015603:Keratinocytes / Q000187:drug effects* / Q000378:metabolism / Q000528:radiation effects*; D016760:Proto-Oncogene Proteins c-fos / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000235:genetics; D014466:Ultraviolet Rays
chemical_list: C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; D015850:Interleukin-6; D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D016159:Tumor Suppressor Protein p53; D002392:Catechin; C045651:epigallocatechin gallate