Due to the emergence of antibiotic resistance, antimicrobial photodynamic therapy (aPDT) has recently been demonstrated as a promising alternative to antibiotics to treat wound infections caused by multidrug-resistant (MDR) pathogens. This study aimed to evaluate the bacterial killing efficiency of aPDT mediated by methylene blue (MB) loaded thermosensitive hydrogels against methicillin-resistant Staphylococcus aureus (MRSA). Box-Behnken Design method was employed to investigate the impacts of the polymer compositions, Poloxamer 407, Poloxamer 188 and Carbopol 934P, on the gelation temperature (T) and release rate of MB. The viscosity and in vitro bacterial killing efficiency of three selected formulations with T ranged 25-34 °C and MB release in 2 h (the incubation time used for aPDT experiment) ≥ 70%, were assessed. The viscosity was found to increase with increasing P407 content and increasing total gel concentration. In the in vitro aPDT experiment, all tested MB-hydrogels demonstrated >2.5 log colony forming unit (CFU) reduction against three clinical relevant MRSA strains. Interestingly, the bacterial reduction increased with decreasing amount of gel added (reduced MB concentration). This was possibly attributed to the increased viscosity at higher gel concentration reducing the diffusion rate of released MB towards bacterial cells leading to reduced aPDT efficiency. In summary, aPDT with the thermosensitive MB hydrogel formulations is a promising treatment strategy for wound infections.
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http://dx.doi.org/10.1016/j.jphotobiol.2020.111776 | DOI Listing |
Gels
January 2025
Laboratory of Immunotherapy and Tissue Engineering, Department of Cellular and Tissue Biology, Faculty of Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Copilco Universidad, Coyoacán, Ciudad de México 04510, Mexico.
Currently, there are no therapies that prevent the negative myocardial remodeling process that occurs after a heart attack. Injectable hydrogels are a treatment option because they may replace the damaged extracellular matrix and, in addition, can be administered minimally invasively. Reactive oxygen species generated by ischemia-reperfusion damage can limit the therapeutic efficacy of injectable hydrogels.
View Article and Find Full Text PDFBioact Mater
April 2025
Department of Cariology, Restorative Sciences and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
Injectable biomaterials, such as thermosensitive chitosan (CH)-based hydrogels, present a highly translational potential in dentistry due to their minimally invasive application, adaptability to irregular defects/shapes, and ability to carry therapeutic drugs. This work explores the incorporation of azithromycin (AZI) into thermosensitive CH hydrogels for use as an intracanal medication in regenerative endodontic procedures (REPs). The morphological and chemical characteristics of the hydrogel were assessed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR).
View Article and Find Full Text PDFActa Biomater
January 2025
Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, Institute of Immunology, The First Hospital, Jilin University, Changchun, Jilin, PR China; National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin, PR China; International Center of Future Science, Jilin University, Changchun, Jilin, PR China; State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, Jilin, PR China. Electronic address:
Tumor-associated macrophages (TAMs) significantly influence the clinical outcomes of immune checkpoint blockade (ICB) therapy. Strategies aimed at reprogramming TAMs from the immunosuppressive M2 phenotype to the pro-inflammatory M1 phenotype hold promise for enhancing ICB efficacy. Lipopolysaccharide (LPS), a potent Toll-like receptor 4 (TLR4) ligand, can reprogram TAMs toward an M1 phenotype.
View Article and Find Full Text PDFInt J Pharm
January 2025
Key Laboratory of Biopharmaceutical Preparation and Delivery, State Key Laboratory of Biochemical Engineering, Chinese Academy of Sciences, Beijing 100190 China; Key Laboratory of Industrial Microbiology, Ministry of Education, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457 China. Electronic address:
Trauma healing is the process of healing after the body has been subjected to an external force and the skin and other tissues have become dissected or defective, showing the synergistic effect of various processes. Therefore, the investigation of innovative wound dressings has significant research and clinical implications. In this study, we constructed a zinc based metal-organic framework (MOF) and loaded with antimicrobial peptide LL37 to prepare LL37@ZPF-2 (ZPF = zeolite pyrimidine backbone), which was subsequently integrated with Poloxamer 407 to fabricate LL37@ZPF-2 thermosensitive hydrogel.
View Article and Find Full Text PDFBiomaterials
January 2025
Department of Nuclear Medicine, Xiangya Hospital, Central South University, No. 87 Xiangya Road, Changsha, Hunan, 410008, China; Key Laboratory of Biological Nanotechnology, NHC, No. 87 Xiangya Road, Changsha, Hunan, 410008, China. Electronic address:
Osteoarthritis (OA) is a prevalent and debilitating condition characterized by cartilage destruction and inflammation. Traditional pharmacotherapies for OA are limited by their short-term efficacy and systemic side effects. Radiosynoviorthesis (RSO), involving intra-articular injection of radiopharmaceuticals, has shown promise for OA treatment but is hindered by the toxicity and rapid clearance of radioisotopes.
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