Novel Wound Dressing Based on Postbiotic/Chitosan Film Accelerates Cutaneous Wound Healing

Abstract

Background: Wound healing is a complex and overlapping process involving immune cells, cytokines, and growth factors. Objectives: This study aimed to design and evaluate a novel wound dressing based on postbiotic/chitosan in accelerating wound healing. Methods: Lactobacillus reuteri PTCC1655 was cultured, and the cell-free supernatant (postbiotic) was obtained by medium centrifugation. The films were prepared using the solvent casting method and evaluated in terms of water absorption index, water vapor transmission rate, and antimicrobial properties. Forty-five male Wistar rats were subjected to a full-thickness excisional wound to assess the wound healing potential. The rats were randomly divided into ctrl-, chitosan, and postbiotic groups. The time-course histological and gene expression analysis was performed to compare the dressing efficacy. Results: The films showed proper water absorption and water vapor transmission rate and inhibited the pathogens commonly associated with wound infection. The postbiotic film improved wound healing by modulating the inflammatory phase, increasing collagen and elastin deposition, and enhancing angiogenesis based on the histological results. The gene expression assay showed that the postbiotic film accelerated wound healing by improving the expression of inflammatory mediators (IL-6 and TNF-α) and anti-inflammatory mediators (TGF-β and VEGF). Conclusions: The cell-free supernatant/chitosan/polyethylene glycol (CFS/CS/PEG) biodegradable film could be introduced as a novel dressing for cutaneous wound healing. This transparent film enhances cutaneous wound healing by modulating infiltrated immunity cells and expressing inflammatory/anti-inflammatory cytokines.

Metabiotic extracted from Bifidobacterium bifidum modulates antioxidant capacity and inflammatory responses during peptic ulcer healing in male wistar rats: a preliminary study

“…During the first 72 hours after wound formation, the inflammatory phase initiate which is characterized by the entry of neutrophils and monocytes into the wound site. The release of leukotriene B and the binding of necrotic tissue cell compounds to DAMP receptors in phagocytic cells creates a signaling cascade that causes the production of pro-inflammatory cytokines such as TNFα, IL-lα, and IL-lβ ( 10 , 11 ). During a phenomenon called a respiratory burst, phagocytic cells produce very large amounts of reactive oxygen species (ROS), which play a very important role as secondary messengers in the wound healing process.…”