Pycnoporus sanguineus Polysaccharides as Reducing Agents: Self-Assembled Composite Nanoparticles for Integrative Diabetic Wound Therapy

Abstract

Xiaofei Huang,1 Lihua Shi,1 Yin Lin,1 Cong Zhang,1 Penghui Liu,1 Ran Zhang,2 Qiqi Chen,1 Xudong Ouyang,3 Yuanyuan Gao,2 Yingshuai Wang,3,* Tongyi Sun1,* 1Shandong Key Laboratory of Proteins and Peptides Pharmaceutical Engineering, Shandong Universities Key Laboratory of Biological Medicine, School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, 261053, People’s Republic of China; 2School of Pharmacy, Weifang Medical University, Weifang, Shandong, 261053, People’s Republic of China; 3School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, 261053, People’s Republic of China*These authors contributed equally to this workCorrespondence: Tongyi Sun, Shandong Key Laboratory of Proteins and Peptides Pharmaceutical Engineering, Shandong Universities Key Laboratory of Biological Medicine, School of Life Science and Technology, Weifang Medical University, Baotong Road, Weifang, Shandong, 261053, People’s Republic of China, Tel/Fax [phone], Email [email protected] Yingshuai Wang, School of Life Science and Technology, Weifang Medical University, Baotong Road, Weifang, Shandong, 261053, People’s Republic of China, Tel/Fax [phone], Email [email protected]: Diabetic foot ulcers (DFU) are severe complications of diabetes, posing significant health and societal challenges. Elevated levels of reactive oxygen species (ROS) at the ulcer site hinder wound healing in most patients, while individuals with diabetes are also more susceptible to bacterial infections. This study aims to synthesize a comprehensive therapeutic material using polysaccharides from Pycnoporus sanguineus to promote DFU wound healing, reduce ROS levels, and minimize bacterial infections.Methods: Polysaccharides from P.sanguineus were employed as reducing and stabilizing agents to fabricate polysaccharide-based composite particles (PCPs) utilizing silver ions as templates. PCPs were characterized via UV-Vis, TEM, FTIR, XRD, and DLS. The antioxidant, antimicrobial, and cytotoxic properties of PCPs were assessed through in vitro and cellular experiments. The effects and mechanisms of PCPs on wound healing were evaluated using a diabetic ulcer mouse model.Results: PCPs exhibited spherical particles with an average size of 57.29± 22.41 nm and effectively combined polysaccharides’ antioxidant capacity with silver nanoparticles’ antimicrobial function, showcasing synergistic therapeutic effects. In vitro and cellular experiments demonstrated that PCPs reduced cellular ROS levels by 54% at a concentration of 31.25 μg/mL and displayed potent antibacterial activity at 8 μg/mL. In vivo experiments revealed that PCPs enhanced the activities of superoxide dismutase (SOD) and catalase (CAT), promoting wound healing in DFUs and lowering the risk of bacterial infections.Conclusion: The synthesized PCPs offer a novel strategy for the comprehensive treatment of DFU. By integrating antioxidant and antimicrobial functions, PCPs effectively promote wound healing and alleviate patient suffering. The present study demonstrates a new strategy for the integrated treatment of diabetic wounds and expands the way for developing and applying the polysaccharide properties of P. sanguineus.Keywords: Pycnoporus sanguineus, polysaccharide, injury, antioxidant, antibacterial

Keywords

• pycnoporus sanguineus
• polysaccharide
• injury
• antioxidant
• antibacterial