Work

Anti-Photoaging Effects of a Polysaccharide from Kappaphycus alvarezii In Vitro and In Vivo

Year: 2026

Type: article

Abstract: is a rich source of polysaccharides, but their high molecular weight limits skin permeability and bioavailability. To address this, we employed a free-radical degradation method to produce a low-molecular-weight polysaccharide, KP-90. Evaluation in UVB-irradiated HaCaT cells and UVA-irradiated human dermal fibroblasts demonstrated that KP-90 significantly enhanced cell viability and mitigated oxidative stress by suppressing reactive oxygen species and malondialdehyde, while restoring antioxidant enzymes (SOD, CAT and GSH-Px). Furthermore, KP-90 downregulated matrix metalloproteinases (MMP-1, -3, -9) and pro-inflammatory cytokines (TNF-α, IL-6, IL-1β), thereby reducing extracellular matrix degradation and inflammation. These in vitro findings were corroborated in a UVB/UVA-irradiated nude mice model, where KP-90 alleviated epidermal hyperplasia, increased collagen I and hyaluronic acid synthesis, and improved visible signs such as wrinkles and skin laxity. These findings identify KP-90 against skin photoaging and provide a strategic approach for valorization underexploited marine biomass.

Source: Marine Drugs

DOI: 10.3390/md24020087

Authors: Yixuan Lai, Yuan Wang, Abdul Mueed, Peng Shu, Lijun You, Jiangming Zhong

Institution: South China University of Technology

Language: English

Topic: Skin Protection and Aging

Subfield: Dermatology

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $3,499