Counteracting Skin Aging In Vitro by Phytochemicals

Area of Science:

• Dermatology and photobiology.
• Cell biology and molecular genetics.

Background:

• Ultraviolet (UV) radiation from sun exposure causes significant skin damage, including premature aging, DNA mutations, and increased cancer risk.
• Antioxidant-rich natural extracts and biomolecules are utilized in skincare for prevention and treatment.
• Effective sun protection is vital to prevent irreversible skin damage.

Purpose of the Study:

• To evaluate the protective effects of two solar protection factor (SPF) creams against UV-induced damage in human skin cells.
• To assess the impact of SPF creams on cellular senescence, DNA repair, and gene expression related to cell cycle regulation.

Main Methods:

• Human skin fibroblasts (HFF1), stem cells (SSCs), and keratinocytes (HaCaT) were pre-treated with SPF creams for 72 hours.
• Cells were subsequently exposed to UV light, followed by gene expression analysis of cell cycle regulators (p16, p19, p21, p53, TERT).
• Beta-galactosidase assays measured cell senescence, and antioxidant potential was evaluated to assess free radical scavenging capacity. DNA mutation analysis was also performed.

Main Results:

• The SPF creams demonstrated protective effects across all tested skin cell types (HFF1, SSCs, HaCaT).
• Treated cells exhibited reduced signs of premature senescence and counteracted UV-induced oxidative stress.
• The creams enhanced DNA repair mechanisms and promoted a younger cellular phenotype, mitigating photoaging effects.

Conclusions:

• The tested SPF creams effectively protect skin cells from UV-induced damage and premature aging.
• These products possess antioxidant properties and enhance cellular DNA repair, contributing to a more youthful skin appearance.
• Topical application of these SPF creams is beneficial for preventing sun damage and maintaining skin health.