Basic-Leucine Zipper Transcription Factors/metabolism; Fanconi Anemia Complementation Group Proteins/metabolism; Glycosides/pharmacology; Heme Oxygenase-1/genetics; Keratinocytes/drug effects; NF-E2-Related Factor 2/metabolism; Plant Extracts/pharmacology; Up-Regulation/drug effects; Antioxidants/chemistry; Antioxidants/pharmacology; Basic-Leucine Zipper Transcription Factors/genetics; Cell Line; Cytokines/immunology; Cytoprotection/drug effects; Echinacea/chemistry; Echinacea/cytology; Fanconi Anemia Complementation Group Proteins/genetics; Glycosides/chemistry; Heme Oxygenase-1/immunology; Heme Oxygenase-1/metabolism; Humans; Keratinocytes/immunology; Keratinocytes/metabolism; NF-E2-Related Factor 2/genetics; Phenols/chemistry; Phenols/pharmacology; Phenylethyl Alcohol/analogs & derivatives; Phenylethyl Alcohol/pharmacology; Plant Extracts/chemistry; RNA, Messenger/genetics; Syringa/chemistry; Syringa/cytology