Anti-Photoaging Effects of Low Molecular-Weight Fucoidan on Ultraviolet B-Irradiated Mice

Area of Science:

• Dermatology
• Biochemistry
• Marine Biotechnology

Background:

• Ultraviolet (UV) B radiation causes skin photoaging via DNA damage, reactive oxygen species (ROS), inflammation, and extracellular matrix degradation.
• Low molecular-weight fucoidan (LMF) exhibits known antioxidant and anti-inflammatory properties.
• Understanding LMF's protective mechanisms against UVB-induced skin damage is crucial.

Purpose of the Study:

• To investigate the protective effects of LMF against UVB-induced photoaging in a mouse model.
• To evaluate LMF's impact on wrinkle formation, inflammation, oxidative stress, matrix metalloproteinase (MMP) expression, and apoptosis.

Main Methods:

• A UVB-irradiated mouse model was topically treated with varying concentrations of LMF (0.2, 1.0, and 2.0 mg/cm²) daily for 15 weeks.
• Evaluated parameters included wrinkle formation, skin edema, inflammatory markers (IL-1β, IL-10), oxidative stress markers (malondialdehyde, superoxide anion, glutathione), MMP mRNA expression (MMP-1, 9, 13), and apoptosis.
• Histopathological analyses were performed to assess anti-photoaging effects.

Main Results:

• LMF treatments, particularly at 1.0 and 2.0 mg/cm², significantly reduced wrinkle formation, skin edema, and neutrophil infiltration.
• LMF modulated inflammatory cytokines, decreasing IL-1β and increasing IL-10.
• LMF inhibited oxidative stress, reduced malondialdehyde and superoxide anion levels, and enhanced glutathione, while decreasing MMP-1, 9, and 13 mRNA expression.

Conclusions:

• LMF demonstrates significant anti-photoaging effects by mitigating UVB-induced skin damage.
• Its protective mechanisms involve potent antioxidant, anti-inflammatory, anti-apoptotic, and MMP-inhibiting activities.
• LMF shows promise as a topical agent for preventing and treating skin photoaging.