Luteolin Mitigates Photoaging Caused by UVA-Induced Fibroblast Senescence by Modulating Oxidative Stress Pathways

Area of Science:

• Dermatology
• Biochemistry
• Pharmacology

Background:

• Luteolin (Lut) is a plant flavone found in various natural sources.
• While Lut shows anti-photoaging effects, its specific role against ultraviolet A (UVA) radiation-induced damage is less understood.
• Understanding Lut's mechanism against UVA damage is crucial for developing effective skincare strategies.

Purpose of the Study:

• To investigate the efficacy of luteolin (Lut) in preventing ultraviolet A (UVA)-induced skin photoaging.
• To elucidate the underlying mechanisms of Lut's protective effects on fibroblasts and skin.
• To explore Lut's role in modulating oxidative stress and cellular senescence.

Main Methods:

• In vivo studies using BALB/c mice and in vitro studies with NIH-3T3 fibroblasts.
• Biochemical assays including CCK-8, antioxidant enzyme activity, lipid peroxidation, and gene expression analysis (qRT-PCR).
• Histochemical analyses such as staining, immunofluorescence, SA-β-Gal assays, and Western blotting.

Main Results:

• Lut pretreatment enhanced fibroblast vitality and function, inhibiting UVA-induced collagen degradation.
• Lut suppressed UVA-induced expression of senescence factors (P21, P16) and pro-inflammatory SASP factors.
• Lut demonstrated potent antioxidant effects, mitigating UVA-induced oxidative stress and fibroblast senescence.

Conclusions:

• Luteolin effectively mitigates UVA-induced photoaging by enhancing fibroblast function and reducing oxidative stress.
• Lut prevents UVA-induced fibroblast senescence by suppressing oxidative stress pathways and inhibiting senescence markers.
• These findings highlight Lut's potential as a natural agent for preventing and treating skin photoaging.