Purpose: As a cosmetic approach to prevent pollution-induced skin damage, the topical application of skincare products, infused with functional ingredients, can offer an optimal solution to skin problems. The study aims to assess the anti-inflammatory effect of PT-7 gel. Methods: This study prepared antipollution cosmetics using palmitoyl tetrapeptide-7 (PT-7; 3% PT-7 gel, 5% PT-7 gel) and performed safety testing. For the safety assessment, the human repeat insult patch test (HRIPT) was performed to detect erythema occurrence on the patch area, following the ICDRG criteria. The panels comprised of 30 adults, aged 20-50 years. Furthermore, this study also analyzed particulate matter (PM) 10-induced inflammation on the skin of a hairless mouse by immunohistochemistry and Western blot. Results: The cosmetic safety testing results showed no skin reactions to antipollution gels containing PT-7. Immunohistochemistry and the Western blot analysis demonstrated reduced levels of IL-1β and IL-6 expression levels in the 3% PT-7 and 5% PT-7 application groups after PM10 treatment. In particular, after PM10 treatment, the IL-1β and IL-6 expression levels were statistically significantly decreased in the group treated with 5% PT-7. Conclusions: Collectedly, this study provided evidence of the PT-7 gel's safety and found that PT-7 gel reduced the IL-1β and IL-6 expression levels caused by PM10 exposure. In view of these results, it supports that PT-7 is a promising antipollution cosmetic ingredient with great commercial potential.
Purpose: Information regarding the hazards of cuticle removers is scarce, and product safety reports are also insufficient. This study aimed to assess the safety of cuticle remover cosmetics. Methods: This study evaluated the safety of the top three commercially sold cuticle removers, Blue cross, Zero cleanser, and Flower vita, which are all widely used in nail care. Human nail matrix cells were isolated and cultured in a defined medium. The toxic effect of cuticle removers on the cultured human nail matrix cells, HS68, and HaCaT, were identified via MTT-assay. The cuticle remover cosmetics were diluted to the following concentrations: 0.5, 1.0, 1.75, 2.5, 10, 20, and 25 µg/mL. Results: All three cuticle removers showed significant cytotoxicity to the human nail matrix, HS68, and HaCaT cells in a dose-dependent manner. The viability of cells treated with 10 µg/mL of Blue Cross and Zero cleanser was below 10%. Conversely, Flower Vita treatment at concentrations of 0.5-20 µg/ mL did not affect the viability (above 70%) of the nail matrix cells, HS68, and HaCaT. Conclusions: Among the cuticle removers tested, Flower Vita showed the lowest cytotoxic effect in the nail matrix, HS68, and HaCaT cells, proving its safety. This study supports that nail matrix cells are developing as an evaluation method for nail damage.
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