ABSTRACT
BACKGROUND/OBJECTIVES: Ultraviolet radiation (UV) is a major cause of skin photoaging. Previous studies reported that ethanol extract (PET) of Prunus persica (L.) Batsch flowers (PPF, peach flowers) and its subfractions, particularly the ethylacetate (PEA) and n-butanol extracts (PBT), have potent antioxidant activity and attenuate the UV-induced matrix metalloproteinase (MMP) expression in human skin cells. In this study, we investigated the protective activity of PPF extract against UV-induced photoaging in a mouse model. MATERIALS/METHODS: Hairless mice were treated with PET or a mixture of PEA and PBT either topically or orally along with UV irradiation. Histological changes and biochemical alterations of mouse skin were examined. Major phenolic compounds in PPF extract were analyzed using an ACQUITY UPLC system. RESULTS: The overall effects of topical and oral treatments with PPF extract on the UV-induced skin responses exhibited similar patterns. In both experiments, the mixture of PEA and PBT significantly inhibited the UV-induced skin and epidermal thickening, while PET inhibited only the UV-induced epidermal thickening. Treatment of PET or the mixture of PEA and PBT significantly inhibited the UV-induced MMP-13 expression, but not typeⅠ collagen expression. Topical treatment of the mixture of PEA and PBT with UV irradiation significantly elevated catalase, superoxide dismutase (SOD) and glutathione-peroxidase (GPx) activities in the skin compared to those in the UV irradiated control group, while oral treatment of the mixture of PEA and PBT or PET elevated only catalase and SOD activities, but not GPx. Thirteen phytochemical compounds including 4-O-caffeoylquinic acid, cimicifugic acid E and B, quercetin-3-O-rhamnoside and kaempferol glycoside derivatives were identified in the PPF extract. CONCLUSIONS: These results demonstrate that treatment with PET or the mixture of PEA and PBT, both topically or orally, attenuates UV-induced photoaging via the cooperative interactions of phenolic components having anti-oxidative and collagen-protective activities.
Subject(s)
Animals , Humans , Mice , 1-Butanol , Catalase , Collagen , Ethanol , Flowers , Matrix Metalloproteinase 13 , Mice, Hairless , Peas , Phenol , Prunus persica , Skin , Superoxide DismutaseABSTRACT
Objective:To illuminate a method for establishment of a cost-efficient atopic dermatitis (AD) mouse model by topical application of ovalbumin (OVA),super-antigen staphylococcal enterotoxin B (SEB),and calcipotriene ointment (CO) on the back of BALB/c mice.Methods:Experimental mice were topically treated with OVA/SEB or OVA/SEB/CO every other day during 15 days of induction.Clinical alterations on the skin area were monitored every other day.Epidermal thickness were measured by reflectance confocal microscope (RCM) before harvest.Inflammatory cells in skin biopsies were marked by hematoxylin-eosin (HE) staining.Blood sample and skin biopsies were measured by ELISA and quantitative real-time PCR to detect the expression of IL-2,IL-4,IL-31,interferon (IFN)-γ,tumor necrosis factor (TNF)-α pruritus-associated nerve growth factor (NGF),and serum IgE.Results:Human AD-like cutaneous local inflammatory reaction was characterized by the accumulation of inflammatory cells,increased epidermal thickness and serum IgE levels as well as Th1 cell-associated cytokines (IFN-γ,TNF-α),Th2 cell-associated cytokines (IL-4,IL-31),and NGF in the OVA/SEB/CO group compared with that in the normal control group or the OVA/ SEB group.Conclusion:OVA/SEB/CO can induce an AD-like mouse model with lower economic and time consumption.
ABSTRACT
Objective To clarify the association of age and sun exposure with human epidermal thickness, and to probe deeply into the changes of skin histology and epidermal thickness with skin aging.Methods Two hundreds and eleven full thickness skin samples were collected from 3 different age groups of healthy volunteers and then stained with haematoxylin and eosin to study the changes of epidermal thickness using image analysis software ( Image pro plus 6.0). The obtained values were analyzed with factorial design ANOVA and correlation analysis to detect any significant effects of age and sun exposure on epidermal thickness.Results With increasing age, the junction between epidermis and dermis became flattened, and stratum comeum got looser. There was a notable attrition of the epidermal thickness that could be correlated with age. The at-trition of epidermal thickness attributed to age did not vary between female and male volunteers. Epidermal cell layers thickness increased with cumulated sun exposure, but epidermal total thickness was not associated with sun exposure. There was no difference for epidermal thickness of different sun exposure between female and male volunteers. Conclusion During chronological aging, epidermal cells decrease in thickness with lowered metabolism. With cumulated sun exposure, epidermal cell layer thickness becomes thicker. There is no interaction between the effect of age and sun exposure and the epidermal thickness.