Antioxidant activities of phenolic acids on ultraviolet radiation-induced erythrocyte and low density lipoprotein oxidation.
The exposure of mammalian cells to UV light induces various deleterious responses. Some of the major harmful effects are DNA damage, cell membrane peroxidation, systemic immune suppression, and aging acceleration. Reactive oxygen species and free radicals are believed to be largely responsible for some of the deleterious effects of UV upon cells. Typical administration of antioxidants has recently proved to represent a successful strategy for protecting the cells against UV-mediated oxidative damage. The objective of this study was to investigate the inhibitory effect of phenolic acids (caffeic acid, ferulic acid, gallic acid, and protocatechuic acid) on oxidative damage in human erythrocytes and low-density lipoprotein (LDL) induced by UVB radiation. The results revealed that the thiobarbituric acids reactive substances induced by UVB were decreased from 2.78 to 0.12-0.89 nmol MDA/mg protein in erythrocyte ghost and from 0.72 to 0.14-0.43 nmol MDA/mg protein in LDL by the addition of phenolic acids (100 muM). Caffeic acid, ferulic acid, and gallic acid exhibited over 85 and 60% inhibitory effect toward UVB-induced oxidation in erythrocytes and LDL, respectively. Phenolic acids, especially gallic acid, could maintain the normal glutathione levels and glutathione peroxidase activity in hemolysate from erythrocytes that were exposed to UVB radiation in comparison with untreated control. The results indicate that the antioxidant activities of caffeic acid and ferulic acid play a potential role in protection against UVB oxidative damage to human erythrocytes and LDL.
Hsieh
Chiu-Lan
CL
Department of Food and Nutrition, Hung-Kuang University, 34 Chungchie Road, Shalu, Taichung 43302, Taiwan. clhsieh@sunrise.hk.edu.tw
Yen
Gow-Chin
GC
Chen
Hui-Yin
HY
D000975:Antioxidants / Q000494:pharmacology*; D001713:Biphenyl Compounds; D004912:Erythrocytes / Q000737:chemistry* / Q000187:drug effects / Q000528:radiation effects; D016166:Free Radical Scavengers / Q000737:chemistry; D005978:Glutathione / Q000097:blood; D005979:Glutathione Peroxidase / Q000097:blood; D062385:Hydroxybenzoates / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects* / Q000528:radiation effects*; D008077:Lipoproteins, LDL / Q000737:chemistry; D010084:Oxidation-Reduction; D010851:Picrates / Q000737:chemistry; D014466:Ultraviolet Rays
D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D062385:Hydroxybenzoates; D008077:Lipoproteins, LDL; D010851:Picrates; C004931:1,1-diphenyl-2-picrylhydrazyl; D005979:Glutathione Peroxidase; D005978:Glutathione; C017616:phenolic acid