Melanin the natural color in our skin is synthesized by melanocytes. The distribution pattern in the surrounding keratinocytes and the nature of the formed melanin determine the actual color of our skin. Melanin forms through a series of oxidative reactions involving the amino acid tyrosine in the presence of the enzyme tyrosinase. Skin whitening agents often inhibit the activity of tyrosinase,...

BACKGROUND Natural products made from plant sources have been used in a variety of cosmetic applications as a source of nutrition and as a whitening agent. The flowers of Cassia fistula L, family Fabaceae, have been used as a traditional medicine for skin diseases and wound healing and have been reported to possess anti-oxidant properties. The anti-aging effect of C. fistula flower extract on h...

A number of naturally occurring agents are hypothesized to protect against ultraviolet (UV)‑induced skin damage. The present study screened >50 plant extracts for inhibitors of UVB‑induced cytotoxicity, using cultured normal human epidermal keratinocytes (NHEK), and identified that the fruit of rose myrtle (Rhodomyrtus tomentosa) was the most marked inhibitor of cell death. The protective effec...

The aging process causes a number of changes in the skin, including oxidative stress and dyschromia. The kojic acid (KA) is iron chelator employed in treatment of skin aging, and inhibits tyrosinase, promotes depigmentation. Nanotechnology-based drug delivery systems, such as liquid crystalline systems (LCSs), can modulate drug permeation through the skin and improve the drug activity. This stu...

The alkaline elution technique was used to study repair of DNA damage caused by formaldehyde (HCHO) in human bronchial epithelial cells and fibroblasts, skin fibroblasts, and DNA excision repair-deficient skin fibroblasts from donors with xeroderma pigmentosum. Exposure of cells to HCHO resulted in DNA-protein cross-links (DPC) and DNA single-strand breaks (SSB) in all cell types. DPC were indu...

The alkaline elution technique was used to study repair of DNA damage caused by formaldehyde (HCHO) in human bron chial epithelial cells and fibroblasts, skin fibroblasts, and DNA excision repair-deficient skin fibroblasts from donors with xeroderma pigmentosum. Exposure of cells to HCHO resulted in DNA-protein cross-links (DPC) and DNA single-strand breaks (SSB) in all cell types. DPC were ind...

Abstract Zinc nanoparticles (ZnNPs) are showing promising medical applications. However, their cytotoxicity is relatively high. This study aims to use a green synthesis technique based on the natural propolis (honeybees glue) and produce three counterparts of (ZnO-NPs, AuNPs@ZnO AgNPs@ZnO). Then, would be analyzed for potential antibacterial activity cytotoxicity. The compares ZnO-NPs alone its...

In this study the role of glutathione (GSH) in sulfur mustard -induced oxidative stress and cytotoxicity, in human skin fibroblast cell line (HF2FF) was evaluated. Sulfur mustard-induced superoxide radical and hydrogen peroxide formation were evaluated by determination of superoxide dismutase and catalase activity in cell lysate. The cytotoxicity of sulfur mustard was estimated by lactate dehyd...

Background: The aim of this study was to investigate the effect of methanolic extract of Achillea millefolium L. (MEA) on the antiproliferative activity of bleomycin on human prostate cancer and normal skin cells. Materials and Methods: Human prostate cancer cell (DU-145) and human non-malignant fibroblast cell (HFFF2) were treated with MEA at various concentrations ( 20, 100, 500, 1000 and ...

Background: Microbial infections and the resistance to antibacterial drugs are on the rise, and scientists are in search of the safest and most effective approach to overcome them. Medicinal plants are potentially effective against many microorganisms. Therefore, this study was planned to examine the antibacterial properties and cytotoxicity of the extracts of Allium sativum and Myrtus communis...