Related Experiment Video
Updated: Jun 7, 2025
08:08
Antimicrobial Characterization of Advanced Materials for Bioengineering Applications
Published on: August 4, 2018
22.0K
Antimicrobial Peptide SAAP-148-Functionalized Hydrogels from Photocrosslinkable Polymers with Broad Antibacterial
Muhammad Atif1, Gizem Babuççu2, Martijn Riool2,3
1Macromolecular Chemistry, Department of Chemistry and Biology, University of Siegen, Adolf-Reichwein-Strasse 2, 57076, Siegen, Germany.
Macromolecular Rapid Communications
|November 12, 2024
Summary
Antimicrobial peptides (AMPs) are immobilized onto a photocrosslinkable polymer to create effective antimicrobial wound dressings. This approach ensures sustained, non-leaching activity against resistant bacteria, offering a promising alternative to traditional antibiotics.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Infectious Disease Research
Background:
- Antimicrobial peptides (AMPs) show potential for treating skin wound infections but have short biological half-lives.
- Covalent immobilization of AMPs onto substrates offers a solution for long-term antimicrobial functionality.
- Developing advanced wound dressings is crucial to combat antibiotic resistance.
Purpose of the Study:
- To synthesize and characterize a novel photocrosslinkable polymer functionalized with the antimicrobial peptide SAAP-148.
- To evaluate the antimicrobial efficacy and cytotoxicity of the SAAP-148-modified polymer and its hydrogel form.
- To assess the long-term stability and leaching profile of the immobilized AMP in biological environments.
Main Methods:
- Free radical polymerization was used to synthesize the poly(HEAAm-co-BPAAm-co-PFPA-co-EH3A) copolymer.
- The copolymer was modified with SAAP-148 via its amine groups, followed by UV photocrosslinking to form a hydrogel network.
- Antimicrobial activity was tested against common wound pathogens (E. coli, S. aureus, P. aeruginosa, A. baumannii), including multidrug-resistant strains.
- Cytotoxicity was assessed using human lung fibroblasts.
- Leaching studies were performed in diluted human blood plasma and phosphate-buffered saline (PBS).
Main Results:
- The SAAP-148-modified copolymer was non-cytotoxic to human lung fibroblasts.
- Both the modified polymer solution and the photocrosslinked hydrogels demonstrated broad-spectrum antimicrobial activity against tested bacterial strains.
- Covalent attachment prevented SAAP-148 leaching, maintaining antimicrobial activity for at least 48 hours in human blood plasma and 14 days in PBS.
- The hydrogel formulation showed sustained antimicrobial efficacy, particularly in human blood plasma.
Conclusions:
- The SAAP-148-functionalized photocrosslinkable polymer hydrogel is a promising candidate for advanced antimicrobial wound dressings.
- This material offers a stable, non-leaching platform for sustained antimicrobial activity, addressing limitations of free AMPs.
- The developed wound dressing presents a viable alternative to conventional antibiotics for managing complex skin wound infections.
Related Concept Videos
01:23Antimicrobial Proteins
934
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
934
01:18Surface Membrane Barriers
1.1K
The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
1.1K
01:28Gene Regulation in Microbial Communities: Quorum Sensing
3
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
3