It is well documented that the polysaccharide glucomannan (GM), an abundant constituent of the fungal cell wall, in the form of particulate induces strong activation of phagocytes, however, the effects of soluble GM are not known. Activation of phagocyte anti-microbial mechanisms is a crucial part of the innate host defense against invading pathogens. However, under uncontrolled inflammatory conditions they contribute to damage of surrounding tissues. Thus, to prevent these deleterious effects, the activation of phagocytes is a tightly regulated process. Therefore, in this study we analyzed the effect of soluble GM on some neutrophil functions such as reactive oxygen species production, degranulation, and receptor mobilization at the plasma membrane. Soluble GM at the tested concentrations did not stimulate oxidative burst of phagocytes directly but significantly potentiated oxidative burst in response to opsonized zymosan particles. GM induced significant phosphorylation of p47phox subunit of NADPH oxidase on Ser345. This priming effect of GM was accompanied by time and concentration dependent degranulation characterized by increased surface expression of receptors stored in neutrophil granules (CD10, CD11b, CD14, CD35, and CD66b). Degranulation was further confirmed by increase of elastase activity in media. Thus, it could be suggested that soluble GM induces priming of phagocytes connected with their degranulation, the increase of surface receptor expression, and potentiation of oxidative burst response to opsonized particles through the activation of NADPH oxidase.
- MeSH
- Candida chemie MeSH
- fagocyty účinky léků metabolismus MeSH
- fosforylace účinky léků MeSH
- GTP-vázající protein RAC2 MeSH
- lidé MeSH
- mannany farmakologie MeSH
- NADPH-oxidasy metabolismus MeSH
- rac proteiny vázající GTP metabolismus MeSH
- respirační vzplanutí účinky léků MeSH
- zymosan farmakologie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- (1-6)-alpha-glucomannan MeSH Prohlížeč
- mannany MeSH
- NADPH-oxidasy MeSH
- neutrophil cytosolic factor 1 MeSH Prohlížeč
- rac proteiny vázající GTP MeSH
- zymosan MeSH
Several new biocompatible and degradable materials were prepared by chemical modification of sodium hyaluronate. The method of activation of hyaluronate by cyanogen bromide was used and subsequent reaction with nucleophile led to the formation of carbamate. This modification of hydroxyl groups of glycosaminoglycans preserves the carboxyl groups and retains properties of polyelectrolyte. This method affords derivatives easily and the reaction condition correlates with degree of substitution. The experimental results show the effect of reaction conditions (reaction time, ratio of reactants) and effect of substitution on biodegradability. The obtained materials were characterized by nuclear magnetic resonance and Fourier transform infrared spectroscopy.
- MeSH
- biodegradace MeSH
- biokompatibilní materiály chemická syntéza MeSH
- bromkyan chemie MeSH
- gelová chromatografie MeSH
- glykosaminoglykany chemie MeSH
- hyaluronoglukosaminidasa farmakologie MeSH
- hydroxylový radikál chemie MeSH
- karbamáty chemická syntéza MeSH
- kinetika MeSH
- kyselina hyaluronová chemická syntéza chemie MeSH
- nukleární magnetická rezonance biomolekulární MeSH
- rozpustnost MeSH
- skot MeSH
- spektroskopie infračervená s Fourierovou transformací MeSH
- viskozita MeSH
- voda chemie MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- skot MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- biokompatibilní materiály MeSH
- bromkyan MeSH
- glykosaminoglykany MeSH
- hyaluronoglukosaminidasa MeSH
- hydroxylový radikál MeSH
- karbamáty MeSH
- kyselina hyaluronová MeSH
- voda MeSH
