Kyselina hyaluronová (KH) je lineární, přirozeně se vyskytující polysacharid o vysoké molekulové hmotnosti. Je součástí řady bio logických procesů, zejména regulačních, protizánětlivých, imunosupresivních nebo antiproliferativních. Významně váže vodu a podílí se na udržování viskoelasticity tkání, na supramolekulárním prostorovém uspořádání proteoglykanů v extracelulární matrix a na regulaci osmotického tlaku, což významně ovliňuje homogenitu tkáně a její homeostatickou integritu. Díky těmto vlastnostem lze neimunogenní KH použít v mnoha klinických aplikacích. V otorinolaryngologii jsou možnosti jejího využití široké zejména v otologii, laryngologii, rinologii nebo při léčbě zánětlivý stavů a keloidních jizev. Ně kte ré potenciální oblasti využití jsou stále ve stadiu experimentu (genová terapie).
Hyaluronic acid (HA) is a linear, naturally occurring polysaccharide of high molecular weight. It is part of a number of bio logical processes, especially regulatory, anti-inflammatory, immunosuppressive or antiproliferative. It significantly binds water and participates in the maintenance of tissue viscoelasticity, in the supramolecular spatial arrangement of proteoglycans in the extracellular matrix and in the regulation of osmotic pressure, which significantly affects tissue homogeneity and its homeostatic integrity. Due to these properties, non-immunogenic HA can be used in many clinical applications. In otorhinolaryngology, the possibilities of its use are wide, especially in otology, laryngology, rhinology or in the treatment of inflammatory conditions and keloid scars. Some potential areas of use are still in the experimental stage (gene therapy).
Hyaluronan is a natural carbohydrate polymer with a negative charge that fosters gel-like conditions crucial for its cellular functions and industrial applications. As a recognized ligand for proteins, understanding their mutual interactions provides solid ground to tune hyaluronan's gel properties using biocompatible peptides. This work employs NMR and molecular dynamics simulations to identify molecular motifs relevant to hyaluronan-peptide interactions using arginine, lysine, and glycine oligopeptides. Arginine-rich peptides exhibit the strongest binding to hyaluronan according to chemical shift perturbation measurements, followed distantly by the similarly charged lysine. This difference highlights the significance of electrostatics and the peculiarities of the guanidinium side chain in arginine, capable of non-polar interactions that further stabilize the binding. Additional nuclear Overhauser effect measurements do not show stable interaction partners, precluding strong and well-defined complexes. Finally, molecular simulations support our findings and show an extended but significant interaction region, especially for arginine, responsible for the observed enhanced binding, which can also promote cross-linking of hyaluronan polymers. Our findings pave the way for optimizing biocompatible peptides to alter hyaluronan gels' properties efficiently and also explain why hyaluronan-protein interaction typically involves positively charged arginine-rich regions also capable of forming hydrogen bonds and non-polar interactions.
Spinal cord injury (SCI) induces the upregulation of chondroitin sulfate proteoglycans (CSPGs) at the glial scar and inhibits neuroregeneration. Under normal physiological condition, CSPGs interact with hyaluronan (HA) and other extracellular matrix on the neuronal surface forming a macromolecular structure called perineuronal nets (PNNs) which regulate neuroplasticity. 4-methylumbelliferone (4-MU) is a known inhibitor for HA synthesis but has not been tested in SCI. We first tested the effect of 4-MU in HA reduction in uninjured rats. After 8 weeks of 4-MU administration at a dose of 1.2 g/kg/day, we have not only observed a reduction of HA in the uninjured spinal cords but also a down-regulation of CS glycosaminoglycans (CS-GAGs). In order to assess the effect of 4-MU in chronic SCI, six weeks after Th8 spinal contusion injury, rats were fed with 4-MU or placebo for 8 weeks in combination with daily treadmill rehabilitation for 16 weeks to promote neuroplasticity. 4-MU treatment reduced the HA synthesis by astrocytes around the lesion site and increased sprouting of 5-hydroxytryptamine fibres into ventral horns. However, the current dose was not sufficient to suppress CS-GAG up-regulation induced by SCI. Further adjustment on the dosage will be required to benefit functional recovery after SCI.
- MeSH
- chondroitinsulfát proteoglykany MeSH
- glióza patologie MeSH
- hymekromon terapeutické užití MeSH
- krysa rodu rattus MeSH
- kyselina hyaluronová MeSH
- mícha patologie MeSH
- poranění míchy MeSH
- zvířata MeSH
- Check Tag
- krysa rodu rattus MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The modification of biomaterial surfaces has become increasingly relevant in the context of ongoing advancements in tissue engineering applications and the development of tissue-mimicking polymer materials. In this study, we investigated the layer-by-layer (LbL) deposition of polyelectrolyte multilayer protein reservoirs consisting of poly-l-lysine (PLL) and hyaluronic acid (HA) on the hydrophobic surface of poly(glycerol sebacate) (PGS) elastomer. Using the methods of isothermal titration calorimetry and surface plasmon resonance, we systematically investigated the interactions between the polyelectrolytes and evaluated the deposition process in real time, providing insight into the phenomena associated with film assembly. PLL/HA LbL films deposited on PGS showed an exceptional ability to incorporate bone morphogenetic protein-2 (BMP-2) compared to other growth factors tested, thus highlighting the potential of PLL/HA LbL films for osteoregenerative applications. The concentration of HA solution used for film assembly did not affect the thickness and topography of the (PLL/HA)10 films, but had a notable impact on the hydrophilicity of the PGS surface and the BMP-2 release kinetics. The release kinetics were successfully described using the Weibull model and hyperbolic tangent function, underscoring the potential of these less frequently used models to compare the protein release from LbL protein reservoirs.
- MeSH
- kyselina hyaluronová chemie MeSH
- nanočástice layer-by-layer MeSH
- polyelektrolyty MeSH
- polylysin chemie MeSH
- polymery MeSH
- Publikační typ
- časopisecké články MeSH
OBJECTIVE: This study was conducted to provide comparative data on the clinical efficacy and safety of a novel hard-to-heal wound dressing (Sorelex; Contipro a.s., Czech Republic) that combines octenidine and hyaluronan, compared with a silver-based dressing. METHOD: This multicentre, open-label, randomised, post-market, clinical follow-up study provides a comparison of a octenidine and hyaluronan combination with a standard-of-care (SoC) silver-containing dressing. The investigators evaluated the management of infection in the hard-to-heal wounds based on recorded changes in the appearance of the wound bed tissue and the presence of clinical signs of infection after three weeks of treatment. Other relevant assessed parameters of wound healing were: wound size; exudation level; wound pain level; and surrounding skin appearance. RESULTS: The study cohort included 48 patients in the Sorelex arm and 39 patients in the SoC arm. Both products evinced numerous parameters of wound infection management: reductions in the wound bed slough; marked decreases in wound size; the formation of re-epithelialisation and granulation tissue; and improved pain management. Sorelex significantly improved the condition of surrounding skin after three weeks of treatment, unlike SoC. Sorelex reduced wound area significantly more than SoC (p=0.04). No statistically significant differences were detected in other assessed parameters between the two study arms. All the participating investigators expressed their satisfaction with both products. No adverse reactions to Sorelex were recorded over the mean treatment period of 53 days. CONCLUSION: The octenidine and hyaluronan combination provides a new alternative choice of dressing for the treatment of infected hard-to-heal wounds when compared with a silver-based product.
Hyaluronic acid (HA), an extracellular biopolymer found throughout the human body, holds promise as a biocompatible and biodegradable scaffold material. High molecular weight (HMW) HA degrades, generating low molecular weight (LMW) fragments with distinct properties. These fragments can influence the behaviour of cells, including human dental pulp stem cells (hDPSCs) incorporated into HA-containing hydrogels or scaffolds. Therefore, a comprehensive examination of the impact of a range of HA molecular weights on hDPSCs is essential before designing HA-based scaffolds for these cells. hDPSC lines were cultured with LMW HA (800 Da, 1600 Da, 15 kDa), medium molecular weight HA (237 kDa), or HMW HA (1500 kDa) over six passages. The various molecular weights had negligible effects on hDPSCs viability, morphology, adhesion, or relative telomere length. Furthermore, the expression of key surface stemness markers (CD29, CD44, CD73, CD90) remained unaltered. HA did not induce osteogenic, chondrogenic, or adipogenic differentiation. Moreover, the potential for chondrogenic and osteogenic differentiation was not adversely affected by LMW or HMW HA. Various molecular weights of HA seem safe, biocompatible and therefore suitable components for hDPSCs-containing scaffolds. These findings affirm that the hDPCSs will not be negatively affected by HA fragments resulting from scaffold degradation.
Hyaluronic acid (HA) coated irinotecan loaded lignin nanoparticles (HDLNPs) were synthesized using ionic interaction method. Optimized nanoparticles were characterized for their active chemotherapeutic targeting potential to CD44 receptors overly-expressed on cancer cells. Blood component interaction studies supported hemocompatible nature of HDLNPs and also demonstrated their sustained plasma residence property. Cell anti-proliferation and mitochondrial depolarization studies on HT-29 cells suggest significantly (p < 0.01) improved chemotherapeutic efficacy of HDLNPs. In vitro cell based studies showed that nanoparticles have retained antioxidant activity of lignin that can prevent cancer relapse. In vivo biodistribution studies in tumor-bearing Balb/c mice confirmed improved drug localization in tumor site for longer duration. Tumor regression and histopathological studies indicated the efficacy ofligand-assisted targeting chemotherapy over the conventional therapy. Hematological and biochemical estimation suggested that irinotecan-associated myelosuppression, liver steatosis and rare kidney failure can be avoided by its encapsulation in HA-coated lignin nanoparticles. HDLNPs were found to be stable over a period of 12 months.
- MeSH
- antigeny CD44 metabolismus MeSH
- antitumorózní látky chemie MeSH
- irinotekan farmakologie MeSH
- kyselina hyaluronová chemie MeSH
- lignin MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- nádory tračníku farmakoterapie MeSH
- nanočástice chemie MeSH
- tkáňová distribuce MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Intrauterinní adheze jsou závažnou komplikací, která vzniká po intrauterinních výkonech, nejčastěji v souvislosti s graviditou. Projevy jako amenorea, pellipatia a neplodnost jsou pro ženu závažné obzvláště v reprodukčním věku a nazýváme je spolu s intrauterinními adhezemi Ashermanovým syndromem. Důležitá je primární prevence po intrauterinních výkonech. Z publikovaných studií vyplývá, že použití gelu kyseliny hyaluronové především po abortech vede k prevenci vzniku středních a těžkých intrauterinních adhezí a zvyšuje také míru otěhotnění.
Intrauterine adhesions are a serious complication that occurs after intrauterine procedures, most often in connection with pregnancy. Manifestations such as amenorrhea, pelvic pain, and infertility for a woman, especially in reproductive age, are serious and together with intrauterine adhesions we call them Asherman’s syndrome. Primary prevention after intrauterine procedures is important. Published studies show that the use of hyaluronic acid gel, especially after abortions, leads to the prevention of moderate and severe intrauterine adhesions and also increases the pregnancy rate.
- MeSH
- adheze tkání etiologie prevence a kontrola MeSH
- gynatrézie prevence a kontrola MeSH
- hysteroskopie MeSH
- indukovaný potrat MeSH
- kyselina hyaluronová aplikace a dávkování terapeutické užití MeSH
- lidé MeSH
- nemoci dělohy komplikace MeSH
- pooperační komplikace prevence a kontrola MeSH
- těhotenství MeSH
- Check Tag
- lidé MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
- Publikační typ
- přehledy MeSH
Aims: Professional polo-water athletes are exposed to chlorine in the swimming pool. Chlorine is an irritant agent, so polo-water athletes commonly experience irritative eye symptoms. Hyaluronic acid and glycuronate enoxolone exert anti-inflammatory and cytoprotective activity. Therefore, the present practical experience explored the efficacy and safety of eye drops containing both components. Material and Methods: The current study included 59 professional polo-water athletes. The ocular surface disease index (OSDI) and dry eye-related quality of life (QoL) score (DEQS) questionnaires were used to assess the efficacy. Subjects took the eye drops for one month. The study consisted of a baseline visit (T0) and an end-treatment one (T1). Results: Athletes experienced a significant improvement in symptoms and QoL as assessed by OSDI and DEQS scores (p < 0.001 for both). Conclusion: The present study showed that professional polo-water athletes frequently experience ocular discomfort associated with swimming pool attendance. Eye drops with hyaluronic acid and glycuronate enoxolone can significantly relieve eye symptoms and improve the quality of life in these athletes.
Kyselina hyaluronová je polysacharid s mnohostranným uplatněním. V urologii našla své místo v mnoha využitích. Uplatňuje se v rámci prevence recidiv infekcí dolních cest močových, léčby post-radiační cystitis či syndromu chronické bolesti močového měchýře. Dále má využití v andrologii i v dětské urologii.
Hyaluronic acid is a polysaccharide with various utlization. In urology, hyaluronic acid found its place in many uses. It is applied in prevention of recurrence of lower urinary tract infections, treatment of post-radiation cystitis or in therapy of primary bladder pain syndrome. It is also used in andrology or pediatric urology.
- Klíčová slova
- syndrom primární bolesti močového měchýře, postradiační cystitida,
- MeSH
- bolest MeSH
- cystitida farmakoterapie MeSH
- infekce močového ústrojí prevence a kontrola MeSH
- kyselina hyaluronová aplikace a dávkování farmakologie terapeutické užití MeSH
- lidé MeSH
- nemoci močového měchýře farmakoterapie MeSH
- stresová inkontinence moči farmakoterapie MeSH
- striktura uretry farmakoterapie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
