A Stable and Local H₂ Nanogenerator for Antifading Responses

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cosmetic Science

Background:

• Persistent inflammation is a hallmark of cellular senescence.
• Traditional hydrogen (H2) therapy faces challenges with solubility and efficiency.
• Developing advanced systems for targeted H2 delivery is crucial for anti-aging and anti-inflammatory treatments.

Purpose of the Study:

• To design and evaluate an in-situ hydrogen production system (HPS) for efficient H2 generation.
• To investigate the anti-inflammatory and anti-senescence effects of the HPS.
• To assess the potential of HPS for transdermal delivery in cosmetic applications.

Main Methods:

• Liposome-encapsulated system utilizing emodin (photosensitizer), L-ascorbic acid-2-phosphate trisodium salt (AAP, H2 source), and gold nanoparticles (Au NPs, photocatalyst).
• Characterization of HPS stability under thermal stress.
• In vitro assessment of HPS efficacy in reducing inflammatory factors (TNF-α, IL-6, ROS) and senescence markers (β-galactosidase) in RAW264.7 cells.
• In vitro transdermal penetration studies using pig skin models.

Main Results:

• The HPS demonstrated excellent stability at 50°C for 28 days.
• HPS significantly reduced levels of TNF-α, IL-6, and ROS in cells.
• Senescence-associated β-galactosidase activity was effectively eliminated by the HPS.
• Successful transdermal penetration of the HPS through pig skin was confirmed.

Conclusions:

• The developed HPS offers a stable and efficient platform for in-situ hydrogen production.
• The system exhibits potent anti-inflammatory and anti-senescence properties.
• The HPS shows significant promise for transdermal delivery in anti-aging and cosmetic formulations.