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Accelerating repair of infected bone defects through post-reinforced injectable hydrogel mediated antibacterial/immunoregulatory microenvironment at bone-hydrogel interface.
Carbohydr Polym
March 2025
Department of Orthopedics Trauma and Microsurgery, Zhongnan Hospital, Wuhan University, Wuhan 430000, China; Hubei Clinical Medical Research Center of Trauma and Microsurgery, Wuhan 430000, China. Electronic address:
Functional injectable hydrogel (IH) is promising for infected bone defects (IBDs) repair, but how to endow it with desired antibacterial/immunoregulatory functions as well as avoid mechanical failures during its manipulation has posed as main challenges. Herein, rosmarinic acid (RosA), a natural product with antibacterial/immunoregulatory activities, was utilized to develop a FCR IH through forming phenylboronic acid ester bonds with 4-formylphenyl phenylboronic acid (4-FPBA) grafted chitosan (CS) (FC). After being applied to the IBD site, the FCR IH was then injected with tobramycin (Tob) solution, another alkaline antibacterial drug, to induce in situ crystallization of the FC, endowing the resultant FCRT hydrogel with adaptively enhanced mechanical strength and structural stability.
View Article and Find Full Text PDFInduction of PD-1 and CD44 in CD4 T cells by circulatory extracellular vesicles from severe dengue patients drives endothelial damage via the NF-kB signaling pathway.
J Virol
December 2024
Laboratory of Virology, Regional Centre for Biotechnology, National Capital Region Biotechnology Science Cluster, Faridabad, Haryana, India.
Extracellular vesicles (EVs) emerged as critical contributors to the pathogenesis of vascular endothelial barrier dysfunction during the inflammatory response to infection. However, the contribution of circulating EVs to modifying endothelial function during dengue virus infection remains unclear. In this study, we showed that severe dengue patients' plasma-derived EV (SD-EV) were found to carry elevated levels of different protein cargos, e.
View Article and Find Full Text PDFGelatin methacryloyl hydrogel encapsulating molybdenum-inspired macrophage-derived exosomes accelerates wound healing via immune regulation and angiogenesis.
Int J Biol Macromol
December 2024
State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China; Department of Periodontology, School & Hospital of Stomatology, Wuhan University, Wuhan 430079, China. Electronic address:
Clinically, abnormal or delayed wound healing leads to functional disorders and disfiguring scars. A well-vascularized environment and an anti-inflammatory immune state are crucial during the healing process. Molybdenum (Mo) is an essential element for the human body in modulating metabolism, immune function and tissue repair.
View Article and Find Full Text PDFPlatelet-Rich Fibrin (PRF) Analyzed for Cytokine Profiles - A Misguided Hope for Osteogenesis in Jawbone Defects? Research and Clinical Observational Study.
Clin Cosmet Investig Dent
November 2024
Department of Implantology, Clinic for Integrative Dentistry, Munich, Germany.
Background: Platelet-rich fibrin (PRF) blood concentrates are used in oral implantology and defect surgery to promote osteoneogenesis in Bone Marrow Defects in Jawbone (BMDJ), according to the morphology of fatty-degenerative osteonecrosis also called FDOJ.
Question: Can the benefit of PRF on alveolar osteoneogenesis be confirmed by cytokine analysis?.
Methods: The cytokine expressions of the PRF samples in 26 patients undergoing BMDJ/FDOJ surgery in the same session were analysed for seven cytokines (RANTES/CCL5; FGF-2; IL-1RA; Il-6; IL-8; MCP-1; TNF-a) by multiplex (Luminex).
A Glucocorticoid-Mediated Immunoregulatory Circuit Integrated at Brain Levels: Our Early Studies and a Present View.
Neuroimmunomodulation
December 2024
Research Group Immunophysiology, Department Neurophysiology, Institute of Physiology and Pathophysiology, Marburg, Germany.
Background: It was known since the 1940s that pharmacological administration of glucocorticoids can inhibit inflammatory and immune processes, and these hormones are still today among the most widely used therapeutic tools to treat diseases with immune components. However, it became clear later that endogenous glucocorticoids can either support or restrain immune processes.
Summary: Early studies showed that (a) endogenous levels of glucocorticoids can modulate immune cell activity; (b) the immune response itself can stimulate the hypothalamus-pituitary-adrenal (HPA) axis to release glucocorticoids to levels that can exert immunoregulatory effects; (c) immune products, later identified as cytokines, mediate this effect.
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