The skin is the primary tissue affected by wounds and aging, significantly impacting its protective function. Natural products are widely used in cosmetics, representing a new approach to preventing age-related damage. Nanomedicine combines nanotechnology and traditional treatments to create innovative drugs. The main targets of nanotechnological approaches are wound healing, regeneration, and rejuvenation of skin tissue. The skin barrier is not easily permeable, and the creation of modern nanodevices is a way to improve the passive penetration of substances. In this study, Helichrysum italicum oil (HO) was combined with different types of electrospun nanofibers to study their protective activity on the skin and to evaluate their future application for topical treatments. In the present research, we used biodegradable polymers, including polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), which were characterized by a scanning electron microscope (SEM). All results show a positive trend in cell proliferation and viability of human skin stem cells (SSCs) and BJ fibroblasts pre-treated with combined nanofibers and then exposed to UV stress. Gene expression analysis revealed the activation of a molecular rejuvenation program in SSCs treated with functionalized nanofibers before UV exposure. Understanding the mechanisms involved in skin changes during aging allows for the future application of nanomaterials combined with HO directly to the patients.

• MeSH
• biologické přípravky * farmakologie   MeSH
• hojení ran MeSH
• kůže MeSH
• lidé MeSH
• nanovlákna * MeSH
• polyvinylalkohol MeSH
• stárnutí kůže * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

Hydrogel based matrices and titanium dioxide (TiO2) nanoparticles (NPs) are well established materials in bone tissue engineering. Nevertheless, there is still a challenge to design appropriate composites with enhanced mechanical properties and improved cell growth. Progressing in this direction, we synthesized nanocomposite hydrogels by impregnating TiO2 NPs in a chitosan and cellulose-based hydrogel matrix containing polyvinyl alcohol (PVA), to enhance the mechanical stability and swelling capacity. Although, TiO2 has been incorporated into single and double component matrix systems, it has rarely been combined with a tri-component hydrogel matrix system. The doping of NPs was confirmed by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and small- and wide-angle X-ray scattering. Our results showed that incorporation of TiO2 NPs improved the tensile properties of the hydrogels significantly. Furthermore, we performed biological evaluation of scaffolds, swelling degree, bioactivity assessment, and hemolytic tests to prove that all types of hydrogels were safe for use in the human body. The culturing of human osteoblast-like cells MG-63 on hydrogels showed better adhesion of cells in the presence of TiO2 and showed increasing proliferation with increasing amount of TiO2. Our results showed that the sample with the highest TiO2 concentration, CS/MC/PVA/TiO2 (1 %) had the best biological properties.

• MeSH
• celulosa farmakologie   MeSH
• chitosan * farmakologie   chemie   MeSH
• hydrogely farmakologie   chemie   MeSH
• lidé MeSH
• nanočástice * chemie   MeSH
• polyvinylalkohol chemie   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

A little is known about the link between the macromolecular architecture of dialdehyde polysaccharides (DAPs), their crosslinking capabilities, and the properties of resulting hydrogels. Here, DAPs based on cellulose, dextrin, dextran, and hyaluronate were compared as crosslinkers for poly(vinyl alcohol), PVA. The swelling, network parameters, viscoelastic properties, porosity, and cytotoxicity of PVA/DAP hydrogels were investigated concerning the crosslinker structure, molecular weight, aldehyde group density per macromolecule, and the size of spontaneously formed crosslinker nano-assemblies. Generally, crosslinkers based on linear polysaccharides (cellulose, hyaluronate) performed more reliably, while the presence of branching could be both beneficial (dextran) but also detrimental (dextrin) at lower crosslinker concentrations. For example, the hydrogel swelling differed by up to one-third (600 vs. 400%) and storage modulus even by up to one half (~7000 vs. ~3500 Pa) depending on crosslinker structure and properties. These differences were rationalized by variances in crosslinking modes derived based on obtained data.

• MeSH
• buňky NIH 3T3 MeSH
• hydrogely chemie   farmakologie   MeSH
• myši MeSH
• polysacharidy chemie   farmakologie   MeSH
• polyvinylalkohol chemie   farmakologie   MeSH
• reagencia zkříženě vázaná chemie   farmakologie   MeSH
• viabilita buněk účinky léků   MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• srovnávací studie MeSH

The formulation of amorphous solid dispersions (ASDs) represents a promising strategy for improving the poor bioavailability of many active pharmaceutical ingredients (APIs). The objective of this study was to investigate and compare the long-term physical stability (LTPS) of polyvinyl alcohol (PVA)-based solid dispersions formulated via hot-melt extrusion (HME) with their respective API-PVA temperature-composition (T-C) phase diagram. Furthermore, the impact of API glass-forming ability (GFA) on the LTPS was evaluated through the selection of two APIs with contrasting GFA (i.e., indomethacin (IND; good GFA) and naproxen (NAP; poor GFA)). Even though the predicted solubility of both APIs in PVA was less than 1 wt% at T = 25 °C, IND remained fully amorphous in HME-formulated IND-PVA extrudates with initial API loadings of 50, 40, and 30 wt% after a 24-month storage period. Meanwhile, NAP recrystallized to a considerable degree in each analogous sample with an amorphous NAP content of 22.5-23.5 wt% remaining after a 12-month storage period. While the constructed T-C phase diagrams were still in agreement with their respective LTPS study, they did not account for the impact of water uptake as well as potential HME-induced effects on the extrudate glass-transition temperature. This work may serve as a useful reference point for researchers who are interested in determining the solubility of an API in a semi-crystalline polymer and the challenges therein.

• MeSH
• chemie farmaceutická MeSH
• polymery * chemie   MeSH
• polyvinylalkohol * MeSH
• příprava léků MeSH
• rozpustnost MeSH
• termodynamika MeSH
• Publikační typ
• časopisecké články MeSH

Bone tissue engineering tries to simulate natural behavior of hard tissues. This study aimed to produce scaffolds based on polyvinyl alcohol (PVA) and hyaluronic acid (HA) with hydroxyapatite (HAp) incorporated in two different ways, by in situ synthesis and physical mixing of pre-prepared HAp. In situ synthesis resulted in calcium deficient form of HAp with lower crystallinity. The proliferation of human osteoblast-like cells MG-63 proved to be better in the scaffolds with in situ synthesized HAp compared to those with physically mixed pre-prepared HAp. For scaffolds with PVA/HA/HAp ratio 3:1:2, there was significantly higher initial adhesion (p = 0.0440), as well as the proliferation in the following days (p < 0.001). It seemed to be advantageous improve the properties of the scaffold by in situ synthesizing of HAp directly in the organic matrix.

• MeSH
• biokompatibilní materiály chemie   MeSH
• buněčná adheze MeSH
• hemolýza MeSH
• hydrogely chemie   MeSH
• hydroxyapatit chemie   MeSH
• kyselina hyaluronová chemie   MeSH
• lidé MeSH
• osteoblasty cytologie   MeSH
• polyvinylalkohol chemie   MeSH
• proliferace buněk MeSH
• testování materiálů MeSH
• tkáňové inženýrství MeSH
• tkáňové podpůrné struktury chemie   MeSH
• viabilita buněk MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

In this study, an antimicrobial mumio-based hydrogel dressing was developed for wound healing application. The mechanism of gel formation was achieved via a double crosslink network formation between gelatin (GT) and polyvinyl alcohol (PVA) using polyethylene glycol diglycidyl ether (PEGDE) and borax as crosslinking agents. To enhance the mechanical integrity of the hydrogel matrix, bacterial cellulose (BC) was integrated into the GT-PVA hydrogel to produce a composite gel dressing. The obtained hydrogel was characterized by FTIR, SEM, TGA, and XRD. Gel fraction, in vitro swelling and degradation as well as compressive modulus properties of the gel dressing were investigated as a function of change in PVA and BC ratios. By increasing the ratios of PVA and BC, the composite dressing showed lower swelling but higher mechanical strength. Comparing to other formulations, the gel with 4 %w/v PVA and 1 %w/v BC demonstrated to be most suitable in terms of stability and mechanical properties. In vitro cell cytotoxicity by MTT assay on human alveolar basal epithelial (A549) cell lines validated the gels as non-toxic. In addition, the mumio-based gel was compared to other formulations containing different bioactive agents of beeswax and cinnamon oil, which were tested for microbial growth inhibition effects against different bacteria (S. aureus and K. pneumoniae) and fungi (C. albicans and A. niger) strains. Results suggested that the gel dressing containing combinations of mumio, beeswax and cinnamon oil possess promising future in the inhibition of microbial infection supporting its application as a suitable dressing for wound healing.

• MeSH
• antibakteriální látky farmakologie   MeSH
• antiinfekční látky * MeSH
• hojení ran MeSH
• hydrogely * MeSH
• lidé MeSH
• obvazy MeSH
• polyvinylalkohol MeSH
• Staphylococcus aureus MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

The aim of this study was to fabricate novel microparticles (MPs) for efficient and long-term delivery of amikacin (AMI). The emulsification method proposed for encapsulating AMI employed low-molecular-weight poly(lactic acid) (PLA) and poly(lactic acid-co-polyethylene glycol) (PLA-PEG), both supplemented with poly(vinyl alcohol) (PVA). The diameters of the particles obtained were determined as less than 30 μm. Based on an in-vitro release study, it was proven that the MPs (both PLA/PVA- and PLA-PEG/PVA-based) demonstrated long-term AMI release (2 months), the kinetics of which adhered to the Korsmeyer-Peppas model. The loading efficiencies of AMI in the study were determined at the followings levels: 36.5 ± 1.5 μg/mg for the PLA-based MPs and 106 ± 32 μg/mg for the PLA-PEG-based MPs. These values were relatively high and draw parallels with studies published on the encapsulation of aminoglycosides. The MPs provided antimicrobial action against the Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae bacterial strains. The materials were also comprehensively characterized by the following methods: differential scanning calorimetry; gel permeation chromatography; scanning electron microscopy; Fourier transform infrared spectroscopy-attenuated total reflectance; energy-dispersive X-ray fluorescence; and Brunauer-Emmett-Teller surface area analysis. The findings of this study contribute toward discerning new means for conducting targeted therapy with polar, broad spectrum antibiotics.

• MeSH
• amikacin aplikace a dávkování   chemie   MeSH
• antibakteriální látky aplikace a dávkování   chemie   MeSH
• Escherichia coli účinky léků   MeSH
• Klebsiella pneumoniae účinky léků   MeSH
• laktáty chemie   MeSH
• mikrobiální testy citlivosti MeSH
• molekulová hmotnost MeSH
• nosiče léků chemie   MeSH
• polyestery chemie   MeSH
• polyethylenglykoly chemie   MeSH
• polyvinylalkohol chemie   MeSH
• příprava léků metody   MeSH
• Pseudomonas aeruginosa účinky léků   MeSH
• rozpustnost MeSH
• Staphylococcus aureus účinky léků   MeSH
• tobolky MeSH
• uvolňování léčiv MeSH
• velikost částic MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

In transdermal drug delivery applications uniform drug distribution and sustained release are of great importance to decrease the side effects. In this direction in the present research, vanillin crosslinked chitosan (CS) and polyvinyl alcohol (PVA) blend based matrix-type transdermal system was prepared by casting and drying of aqueous solutions for local delivery of enrofloxacin (ENR) drug. Subsequently, the properties including the morphology, chemical structure, thermal behavior, tensile strength, crosslinking degree, weight uniformity, thickness, swelling and drug release of the CS-PVA blend films before and after crosslinking were characterized. In vitro drug release profiles showed the sustained release of ENR by the incorporation of vanillin as a crosslinker into the CS-PVA polymer matrix. Furthermore, the release kinetic profiles revealed that the followed mechanism for all samples was Higuchi and the increase of vanillin concentration in the blend films resulted in the change of diffusion mechanism from anomalous transport to Fickian diffusion. Overall, the obtained results suggest that the investigated vanillin crosslinked CS-PVA matrix-type films are potential candidates for transdermal drug delivery system.

• MeSH
• benzaldehydy MeSH
• chitosan * MeSH
• enrofloxacin MeSH
• léky s prodlouženým účinkem MeSH
• polyvinylalkohol * MeSH
• Publikační typ
• časopisecké články MeSH

Indications to resect part of the GI tract vary from benign to malignant diseases. Construction of the anastomosis is a crucial moment of the operation with a wide range of possibly life-threatening complications. Anastomotic leak is one of the most frequent and dangerous ones that affects up to 35 % of patients with a high mortality rate (up to 30%). Both mortality and incidence have not decreased for years. The project is dedicated to the development of a novel material used in a construction of intestinal anastomosis - functionalized biodegradable nanofibers. The main objective of the project is to speed up the healing of the anastomosis and to prevent the anastomotic leak. The tested material will be fully biodegradable. Nanofibers will be prepared from polyvinylalcohol and functionalized with chitosan and platelet-rich plasma. They will be applied externally to the anastomosis in the form of a textile strap and will be adhered by a tissue sealant. This will be studied in a small animal model (rabbit).

Indikací k resekci části zažívacího traktu je škála maligních a benigních onemocnění. Rekonstrukční část výkonu – vytvoření anastomózy – je zásadním momentem těchto výkonů s řadou možných život ohrožujících komplikací. Anastomotický leak je nejfrekventovanější a nejnebezpečnější z nich. V závislosti na lokalizaci anastomózy postihne až 35% pacientů. Mortalita je vysoká (až 30%), morbidita ještě vyšší. Incidence ani mortalita v posledních letech neklesá. Projekt se zabývá využitím zcela nového materiálu použitelného při konstrukci střevní anastomózy (funkcionalizovaná biodegradabilní nanovlákna) a jeho vlivu na hojení. Hlavním cílem je podpořit hojení anastomózy a zabránit leaku. V experimentu již byla nanovlákna ověřena jako výhodná pro hojení pojivových tkání břišní stěny. Testovaný materiál je plně biodegradabilní. Jedná se o polyvinylalkohol funkcionalizovaný chitosanem a plasmou obohacenou o trombocyty. Na anastomózu bude aplikován zevně ve formě textilního proužku a fixován tkáňovým lepidlem. Nová metoda bude vyzkoušena na malém zvířecím modelu (králík).

• MeSH
• anastomóza chirurgická metody   MeSH
• chitosan terapeutické užití   MeSH
• hojení ran MeSH
• králíci MeSH
• lidé MeSH
• modely nemocí na zvířatech MeSH
• nanovlákna terapeutické užití   MeSH
• netěsnost anastomózy prevence a kontrola   MeSH
• plazma bohatá na destičky MeSH
• polyvinylalkohol terapeutické užití   MeSH
• vstřebatelné implantáty MeSH
• zvířata MeSH
• Check Tag
• králíci MeSH
• lidé MeSH
• zvířata MeSH

• Konspekt
• Patologie. Klinická medicína
• NLK Obory
• koloproktologie
• biomedicínské inženýrství
• chirurgie
• NLK Publikační typ
• závěrečné zprávy o řešení grantu AZV MZ ČR

This study aimed to develop polyvinyl alcohol (PVA) -based scaffold enriched with hyaluronic acid (HA) and hydroxyapatite (HAp) using physical crosslinking by freezing-thawing method. We accomplished biological evaluation of scaffolds, swelling degree, bioactivity assessment, and hemolytic test. The results showed that all types of scaffolds should be safe for use in the human body. The culturing of human osteoblast-like cells MG-63 and their proliferation showed better adhesion of cells due to the presence of HA and confirmed better proliferation depending on the amount of HAp. This paper gives the optimal composition of the scaffold and the optimal amount of the particular components of the scaffold. Based on our results we concluded that the best PVA/HA/HAp combination is in the ratio 3:1:2.

• MeSH
• biokompatibilní materiály metabolismus   farmakologie   MeSH
• buněčná adheze účinky léků   MeSH
• hydrogely chemie   MeSH
• hydroxyapatit metabolismus   farmakologie   MeSH
• kyselina hyaluronová metabolismus   farmakologie   MeSH
• lidé MeSH
• nádorové buněčné linie MeSH
• osteoblasty metabolismus   MeSH
• polyvinylalkohol metabolismus   farmakologie   MeSH
• proliferace buněk účinky léků   MeSH
• testování materiálů metody   MeSH
• tkáňové inženýrství metody   MeSH
• tkáňové podpůrné struktury chemie   MeSH
• viabilita buněk účinky léků   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH