Journal of Biomaterials Science, Polymer Edition最新文献

In recent years, nano technology emerged as a significant approach in drug delivery. Solid Lipid Nanoparticles are on forefront in field of nanotechnology, Lipid nanoparticles have an opportunity to create novel therapies because of their special size-dependent characteristics. This research work was aimed to formulate and optimize Dolichos lablab phytoextract fraction (DLPEF) loaded Nano Lipid Carrier (NLC) and to evaluate its anti-diabetic potential. DLPEF loaded nano lipid particles preparations were made using hot homogenization method and were characterized for particle size, shape, drug loading, in vitro drug release and were screened in-vivo for anti-diabetic activity. From our resulting data, an optimized formulation of DLPEF loaded NLC showed promising results. They were found to be spherical size of 104.7 nm, Polydispersity Index and Drug Loading for the optimized nanolipid carrier preparation were found at 0.667 ± 2.3 and 35.30 ± 3.2% respectively. The in vitro drug release for optimized NLC formulation was found to be 85% ± 2.2 for 18 h. No changes were observed in shape and morphology, confirmed through TEM and SEM after 3 months of stability studies. Diabetes was induced by Streptozotocin, DLPEF NLC treated group showed reduced glucose concentration. The histopathological alterations were also studied in all experimental groups, results of DLPEF NLC treated group showed regeneration of islet cells of pancreas. Thus we could concur that DLPEF NF has almost the same therapeutic potential as standard drug. In conclusion, Dolichos lablab phytoextract NLC substantially improved the solubility, stability and efficacy of the fraction making it a treatment option for diabetes mellitus.

The organization of mammalian cells into three-dimensional (3D) architectures has diverse applications in tissue engineering, regenerative medicine, and in vitro drug screening and evaluation. Incorporation of bioactive polymer-based substrates, engineered into cell-sized materials holds significant promise in modulating the shortage of oxygen and nutrients supply, but conventional techniques face limitations in producing such small materials at high throughput. In this study, we present a facile and versatile strategy for the high-throughput production of fragmented collagen microfibers (F-CMFs) using micronozzle-assisted extrusion and stirring-induced shear forces. By carefully controlling the composition of the gelation agent solution for type-I collagen, particularly the concentrations of a polyanion and a thickener, we were able to precisely design the morphology of F-CMFs. As a practical application, we fabricated dermal tissue models using F-CMFs of varying lengths, in which F-CMFs effectively suppressed cell-driven tissue contraction. Furthermore, we demonstrated the formation of multilayered human skin tissue models comprising dermal and epidermal layers in microchannel-integrated chambers. The proposed approach offers a novel modality for creating diverse tissue models that can precisely control tissue shape and potentially enhance cellular functions through cell-matrix interactions.

Poly(lacticacid-ε-caprolactone) (PLCL) scaffolds face significant challenges in bone regeneration due to excessively slow degradation kinetics and inherent hydrophobicity. To overcome these limitations, we developed a novel ternary 3D-printed scaffold composed of PLCL, poly(p-dioxanone) (PPDO), and hydroxyapatite (HA) via fused deposition modeling (FDM) for the first time. The incorporation of PPDO would accelerate and enable tunable degradation of PLCL to match the bone healing timeline, while HA was aimed to enhance osteoinductivity and regulated the pH level to reduce adverse immune reactions of the acidic degradation products. The results demonstrated that degradation rate of the scaffolds was found to be modulated by PPDO and HA effectively. Moreover, the 3D printing extrusion enabled the porous scaffolds with customizability, diverse shapes, adjustable porosity and uniform pore sizes. In addition, proliferation and adhesion of bone marrow mesenchymal stem cells (BMSCs) as well as the expression of various osteogenic genes (ALP, Col-Ι, OCN, BMP-2, OPN) were also upregulated on the PLCL/PPDO/HA scaffolds. Therefore, these low-cost 3D-printed scaffolds may serve as an optimal bone graft for applications in bone tissue engineering.

As surfactants, amphiphilic molecules form micelles in aqueous solution to load hydrophobic medicines to increase their solubility and absorbability. TPGS, i.e. VE-PEG conjugate, is a commonly used effective surfactant suffering immune effects in human bodies with reduced biocompatibility and stealth property. Among the potential alternatives of PEG, polysarcosine (pSar) is the most promising one due to its outstanding property and effectiveness. Herein, we propose two strategies to polymerize Sar-NPC, direct initialization and post-polymerization chain end modification to conjugate hydrophobic building blocks onto pSar. Direct initial-ization applies amino-group-containing lipids 1,2-distearoyl-sn-glycero-3-phosphoethanolamine (DSPE) and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) as initiators to produce DSPE-pSar and DOPE-pSar, respectively. Post-polymerization chain end modification changes chain end amino group of pSar to carboxyl group for esterification with the hydroxyl groups on vitamin E (VE) and 1,2-dimyristoyl-sn-glycerol (DMG) to produce VE-pSar and DMG-pSar. The degrees of polymerization of pSar blocks are designed to be 14, 25 and 28 precisely, and the CMC values of the amphiphilic products are between 0.28 and 5.63 µg/mL. VE-pSar samples have extremely strong ability to increase the solubility of paclitaxel (PTX), 30 times more than TPGS. It also exhibits high cytocompatibility and low hemolysis rate below 5%, much less than TPGS. The two preparations of pSar-containing surfactants are efficient and versatile, and the products have high probability to become a new generation of clinical hydrophobic medicine solubilizer.

Breast cancer therapy with Axitinib (AXT), a potent tyrosine kinase inhibitor, is limited by poor aqueous solubility, rapid clearance, and off-target toxicity. To address these challenges, we developed AXT-loaded nanomicelles (AXT-M) composed of Triton X-100, Brij-35, and Vitamin-E TPGS, with surface functionalization using hyaluronic acid (HA) for CD44 receptor-mediated targeting (HA-AXT-M). This formulation aims to enhance solubility, improve tumour specificity, and reduce systemic toxicity. The formulation was characterized for particle size, zeta potential, and encapsulation efficiency. Additionally, in vitro drug release, cytotoxicity using the MTT assay in MCF-7 cells, and stability studies under various storage and dilution conditions were performed. The optimized HA-AXT-M showed a particle size of 244.27 ± 1.04 nm, zeta potential of -27.3 mV, and encapsulation efficiency of 87.92%. Drug release studies demonstrated a biphasic release pattern with sustained release over 24 h. Cytotoxicity assays revealed enhanced anticancer activity of HA-AXT-M compared to uncoated micelles and free Axitinib. Stability studies confirmed the physical and chemical stability of the formulation. Moreover, HA functionalization substantially improved cellular uptake and selective targeting of CD44-overexpressing breast cancer cells, minimizing off-target effects. These findings highlight the promise of HA-AXT-M as a targeted nanocarrier platform that enhances the therapeutic potential of Axitinib. This novel delivery system offers improved efficacy, tumour selectivity, and translational relevance for breast cancer therapy.

The article provides an in-depth overview of the mechanical, chemical, and biological properties of engineering materials used for orthopedic bone plates, along with their designs and fabrication methods. This review addresses the benefits and drawbacks of various materials that have been utilized as bone plates for the treatment of fractures and bone abnormalities. Due to their excellent mechanical properties, metallic bone plates have traditionally been employed for bone fracture fixation. However, the mismatch in mechanical properties and high density of metallic bone plates can lead to stress shielding and non-union, often requiring revision surgeries. These challenges are highlighted in the review, which then explores the potential of polymeric plates to overcome such issues. Nevertheless, the insufficient mechanical performance of polymeric bone plates often necessitates the development of composite bone plates that are patient-specific, biocompatible, and easily tailorable. Emerging research initiatives in this area are discussed. The article further elaborates on various fabrication processes and their impact on the surface properties of bone plates. Both conventional machining processes for internal fixation devices and 3D printing methods for fabricating patient-specific, customized bone plates are reviewed. The paper concludes by evaluating current advancements and anticipated developments related to bone plate technology.

This work presents antibacterial wound dressing membranes based on a nonisocyanate polyurethane-siloxane framework. These membranes protect wounded skin by providing mechanical strength, maintaining a moist environment, and ensuring hygiene through chemically anchored antibacterial moieties. Methoxysilane-functionalized soybean oil-based polyhydroxyurethane with quaternary ammonium groups was synthesized and combined with GPTMS and TEOS. Hydrolysis-condensation reactions formed membranes with siloxane domains and pendant epoxy groups. Gelatin was incorporated to enhance biocompatibility and mechanical strength. The resulting films demonstrated tensile strengths of 7.9 MPa (dry) and 0.61 MPa (swelled). Fluid handling capacities were 2.66-2.81 g/10 cm²/day (serum) and 0.79-1.10 g/10 cm²/day (serum vapor), making them suitable for light to moderately exuding wounds. Cytocompatibility was confirmed by MTT assays, showing over 80% fibroblast viability on dressings and over 90% viability in leachate-containing media. The blood compatibility of the dressing was confirmed by standard methods. The dressings also exhibited strong antibacterial activity, with 82% killing of Staphylococcus aureus and 52% killing of Escherichia coli. These results highlight the potential of these membranes for advanced wound care applications.

Oral administration, owing to its high patient compliance and favorable controllability, is widely employed in clinical settings; however, the efficacy is often constrained by the gastrointestinal environment's impact on bioavailability. As the demand for biocompatibility and biodegradability in biomedical applications intensifies, natural hydrogel-based oral drug delivery systems have gained substantial attention as promising carriers. In this study, we introduce a variety of natural materials, revealing their advantages in enhancing drug bioavailability and targeting capabilities. Through both physical and chemical crosslinking mechanisms, we successfully demonstrate hydrogels exhibiting excellent mechanical properties and biocompatibility. Furthermore, we analyze the potential applications of diverse natural oral hydrogels across fields such as gastrointestinal, metabolic, oncological, and immunotherapeutic diseases. By synthesizing recent advances in this area, we aim to elucidate the critical role these systems can play in biomedicine. Our findings suggest that natural materials possess broad prospects in drug delivery, advocating for continued exploration of their clinical application to facilitate the development and optimization of novel oral therapeutic modalities. This work provides a vital theoretical foundation and practical guidance for future innovations in drug delivery technologies.

Millions of individuals worldwide suffer from a chronic metabolic disorder, diabetes, defined as a reduction in insulin production or sensitivity, which raises blood glucose levels, weakens the immune system, and results in irregularities in the metabolism of carbohydrates, fats, and proteins. Therefore, there is still a high demand for non-invasive ways to administer insulin and other antidiabetics to treat diabetes and suitable therapeutics for wound healing. This generates a need for novel biomaterials that effectively use diabetes-associated therapy. This article emphasized that some special -features of Polyhydroxyalkanoates (PHAs) are biocompatible, biodegradable thermoplastic polyesters used in biomedical applications, expanding the options for bioresorbable polymers having antidiabetic and antimicrobial activities. PHAs can be synthesized into scaffolds and nanomaterials that release insulin and other antidiabetic medications in a sustained and controlled way that could improve treatment results. Research analysis on the application of PHAs as scaffold materials for bioartificial pancreas development offers a biocompatible and structurally supportive environment to encapsulate pancreatic cells. Further, challenges including excessive production costs, requirement for additional clinical setting optimization, and the current status of PHAs in the market are emphasized in this review. Further research is needed to explore the therapeutic potential of PHAs exhaustively in diabetes therapeutics and management.

Podophyllotoxin (PPT), a bioactive compound, shows promise as a potential cancer treatment drug. Nevertheless, low solubility and bioavailability of PPT necessitate a drug delivery system to improve its effectiveness. PPT was extracted from Linum album and delivered into HepG2 cancer cells using mPEG-PCL nanoparticles. Copolymers were synthesized and confirmed by UV-Vis, FTIR, ¹HNMR, XRD, FESEM analyses, and the other physicochemical properties were also characterized. The critical micelle concentration of the copolymers was calculated, and the ratio of 1:10 with a CMC of 0.055 µg. mL^-1 was selected as the optimal ratio. The average size and surface charge of micelles were 186 ± 12 nm and -5.13 ± 0.61 mV, respectively. FESEM analysis showed a uniform and spherical structure of nanoparticles. PPT was loaded into mPEG-PCL micelles in various ratios (w/w) of drug: copolymer using the nanoprecipitation method, and the ratio of 1:1 was selected as the optimal ratio with encapsulation and loading efficiency of 79.89 ± 1.28% and 10.15 ± 2.16%, respectively. The PPT release profile demonstrated a significant difference between the sustained release of PPT from the nanoparticles and the rapid release of free PPT. Cellular uptake studies revealed that the polymersomes effectively deliver the PPT to the HepG2 cells. The in vitro cytotoxicity assay showed increased cytotoxicity of PPT/mPEG-PCL NPs compared to the free drug. Based on the overall results, these nanoparticles show promise as a delivery system for controlled release of PPT in cancer therapy.