RESUMO
BACKGROUND: The therapy of pathological type of cough presents serious medical problem. OBJECTIVES: The aim of experiments was to investigate polysaccacharide influence on experimentally induced cough. METHODS: The purified and/or modified polysaccharides from the flowers and plants, characterized by chemical composition and molecular properties were subjected to tests for antitussive activity on cough, induced mechanically in conscious cats of both sexes. RESULTS: The results revealed that the tested polysaccharides exhibited statistically significant cough-suppressing activity, which was noticeably higher than that of the non-narcotic drug used in clinical practice to treat coughing. The most expressive antitussive activity was observed with the polysaccharide from marsh mallow, containing the highest proportion of the uronic acid constituent. Negative influence of the tested compounds on expectoration was negligible when compared to that of codeine. CONCLUSION: Antitussive activity of various plant polysaccharides was confirmed. These results allow ranging them among prospective antitussive agents (Tab. 2, Fig. 6, Ref. 15) Full Text (Free, PDF) www.bmj.sk.
Assuntos
Althaea , Antitussígenos/uso terapêutico , Arctium , Tosse/tratamento farmacológico , Fitoterapia , Extratos Vegetais/uso terapêutico , Polissacarídeos/uso terapêutico , Prunus , Animais , GatosRESUMO
Eleven polysaccharides have been isolated from the leaves of Arctium lappa var. herkules, Aloe barbadensis, Althaea officinalis var. robusta, Plantago lanceolata var. libor, aerial parts and roots of Rudbeckia fulgida var. sullivantii, stems of Mahonia aquifolium, and peach-tree (Prunus persica) gum exudates. The polysaccharides were investigated for their ability to inhibit peroxidation of soyabean lecithin liposomes by OH radicals. The highest inhibition was found with glucuronoxylans of A. officinalis var. robusta and P. lanceolata var. libor, aerial parts. Their antioxidant activity accounted for approximately 69% of the activity of the reference compound alpha-tocopherol. The activity of eight polysaccharides ranged from 20 to 45%, while the fructofuranan from P. lanceolata var. libor roots was practically inactive.
Assuntos
Antioxidantes/análise , Peroxidação de Lipídeos/efeitos dos fármacos , Plantas Medicinais/química , Polissacarídeos/farmacologia , Concentração de Íons de Hidrogênio , LipossomosRESUMO
Aloe vera is widely used in food supplements, beverages, pharmaceuticals, and cosmetics. It has been long recognized as an effective natural remedy for its wound-healing properties and its positive influence on other inflammatory skin disorders. Major proteins and mono- and polysaccharides were identified and analysed from Aloe vera commercial extract. Molecular weight of proteins calculated from the sets of molecular weight reference standards, ranged from 70 kDa for the largest to 14 kDa for the smallest ones. IR spectral analysis of the carbohydrate fraction shows that the main carbohydrate copound is acetylated (1 --> 4)-beta-D-mannan substituated with D-galactose and D-glucose. The results have shown that proteins and polysaccharides are a necessary component in the study of biological activity of Aloe vera leaf extract.
Assuntos
Aloe/química , Extratos Vegetais/química , Humanos , Peroxidase/análise , Extratos Vegetais/farmacologia , Proteínas de Plantas/análise , Polissacarídeos/análise , Pele/efeitos dos fármacosRESUMO
From the leaves of Plantago lanceolata, the green parts of Rudbeckia fulgida, the aerial parts of Salvia officinalis and the roots of Valeriana officinalis, crude polysaccharides have been isolated by extraction with water and further purified and fractionated by various techniques. The water-soluble polysaccharides obtained were examined for their immunomodulatory activities using the in vitro mitogenic and comitogenic rat thymocyte tests. The results indicate that in spite of the considerable differences in chemical composition and structural properties, the tested polysaccharides exhibited similar significant immunomodulatory properties with a particularly high adjuvans activity in the case of the Rudbeckia and Salvia polysaccharides. The pectic polysaccharide-rich complex from Valeriana was shown to also stimulate the immune function of bone marrow cells.
Assuntos
Adjuvantes Imunológicos/farmacologia , Medula Óssea/efeitos dos fármacos , Mitógenos/farmacologia , Fitoterapia , Extratos Vegetais/farmacologia , Plantas Medicinais , Adjuvantes Imunológicos/administração & dosagem , Adjuvantes Imunológicos/uso terapêutico , Animais , Células Cultivadas/efeitos dos fármacos , Europa (Continente) , Masculino , Camundongos , Camundongos Endogâmicos CBA , Mitógenos/administração & dosagem , Mitógenos/uso terapêutico , Componentes Aéreos da Planta , Extratos Vegetais/administração & dosagem , Extratos Vegetais/uso terapêutico , Folhas de Planta , Raízes de Plantas , Plantago , Polissacarídeos/administração & dosagem , Polissacarídeos/farmacologia , Polissacarídeos/uso terapêutico , Ratos , Ratos Wistar , Rudbeckia , Salvia officinalis , Timo/citologia , Timo/efeitos dos fármacosRESUMO
The structure/function relationship of two acidic heteroxylan types, the arabino-(glucurono)xylan from corn cobs (AGX) and 4-O-methylglucuronoxylans (GXs) from beechwood and three medicinal herbs (Rudbeckia, Altheae, and Mahonia), has been studied. The effect of the molecular mass of AGX, as well as the content and distribution of the 4-O-methylglucuronic acid side chains in GXs on the immunological activity of these xylans was characterized by their biological response in the mitogenic and comitogenic thymocyte in vitro tests. Depolymerization of AGX by ultrasonication resulted in unequivocal decrease of the immunomodulatory activity, whereas already a short treatment by endo-beta-1,4-xylanase brought about a significant increase in its activity when applied in the highest dose. In the case of the GX samples, neither the uronic acid content nor the distribution pattern of the uronic acid side chains was found to be determinant for the expression of their immunomodulatory activity.
Assuntos
Adjuvantes Imunológicos/química , Adjuvantes Imunológicos/farmacologia , Xilanos/química , Xilanos/farmacologia , Adjuvantes Imunológicos/isolamento & purificação , Animais , Concentração de Íons de Hidrogênio , Técnicas In Vitro , Ativação Linfocitária/efeitos dos fármacos , Masculino , Fito-Hemaglutininas/farmacologia , Lectinas de Plantas , Plantas Medicinais , Ratos , Ratos Wistar , Relação Estrutura-Atividade , Linfócitos T/efeitos dos fármacos , Linfócitos T/imunologia , Madeira , Xilanos/isolamento & purificação , Zea mays/químicaRESUMO
The crude hydroalcoholic extract of Mahonia aquifolium stem bark and a polysaccharide isolated from the extract were tested for their activity on interleukin-8 (IL-8) production by human monocytic cell line THP-1. The crude extract partly inhibited the IL-8 spontaneous production after 48-h treatment of the cells, while the polysaccharide was found to be a potent inducer of IL-8 production.
Assuntos
Berberidaceae , Interleucina-8/biossíntese , Monócitos/efeitos dos fármacos , Fitoterapia , Extratos Vegetais/farmacologia , Polissacarídeos/farmacologia , Linhagem Celular/efeitos dos fármacos , Ensaio de Imunoadsorção Enzimática , HumanosRESUMO
Crude extracts obtained from the stem bark of Mahonia aquifolium have been investigated as to the chemical composition and anticomplementary activity. The results show that their anticomplementary activity is mainly due to the alkaloid components. Especially the BBI alkaloid fraction and berberine showed a strong inhibitory effect on CH50 total hemolytic complement assay. The crude extract of M. aquifolium was less active than berberine or the fraction BBI alkaloids. The results indicate that the fraction of BBI alkaloids and berberine largely account for the immunomodulatory activity of the crude extract of M. aquifolium.
Assuntos
Benzilisoquinolinas , Berberidaceae/química , Berberina/farmacologia , Ensaio de Atividade Hemolítica de Complemento , Via Clássica do Complemento/efeitos dos fármacos , Isoquinolinas/farmacologia , Extratos Vegetais/farmacologia , Plantas Medicinais/química , Alcaloides/farmacologia , Animais , Cobaias , Casca de Planta/químicaRESUMO
An alkali-extracted low-molecular glucuronoxylan and two water-extractable polysaccharide complexes isolated from various parts of Rudbeckia fulgida were tested for antitussive activity on mechanically induced cough in nonanaesthetized cats. Glucuronoxylan consisted of a (1-->4)-linked beta-D-xylopyranosyl backbone with about 18% of 4-0-methyl-D-glucuronic acid attached to 0-2 of the chain xylose residues. The polysaccharide complexes differed from each the other regarding the in qualitative and quantitative composition of the sugar components. It was found that peroral administration of all the compounds led to a significant suppression of the cough reflex without negative influence on expectoration. Glucuronoxylan and the complex from the aerial parts of the herb exhibited much higher antitussive activity than the complex from the roots which did not contain any uronic acid component. Their activity (48.2% and 46.5%, respectively) highly surpassed the activity of the complex from the roots (23.5%) as well as that of the peripherally acting drugs dropropizine (28.3%) and prenoxdiazine (24.7%).
Assuntos
Antitussígenos/farmacologia , Plantas Medicinais/química , Polissacarídeos/farmacologia , Xilanos/farmacologia , Animais , Gatos , Tosse/prevenção & controle , Feminino , Masculino , Folhas de Planta/química , Raízes de Plantas/química , Caules de Planta/química , Polissacarídeos/química , Espectrofotometria Ultravioleta , Xilanos/química , Xilanos/isolamento & purificaçãoRESUMO
From the medicinal plant Rudbeckia fulgida, var. sillivantii (Boynton et Beadle) a low-molecular-mass (4-O-methyl-alpha-D-glucurono)-D-xylan was isolated by alkaline extraction, followed by ethanol precipitation, ion-exchange chromatography and gel filtration. The results of compositional and linkage analyses, supported by those of 1H and 13C NMR measurements of oligomers generated on partial acid hydrolysis, showed the (1-->4)-linked beta-D-xylopyranosyl backbone with about 18% of 4-O-methyl-D-glucuronic acid attached to O-2 of the xylose residues. From the mean distance of adjacent carboxyl groups, obtained from experimentally determined single-ion activity coefficients of calcium counterions, it followed that the uronic acid units are separated and distributed regularly along the xylan chain, i.e. approximately each sixth D-xylose unit bears a 4-O-methyl-D-glucuronic acid residue.
Assuntos
Plantas Medicinais/química , Xilanos/química , Sequência de Carboidratos , Cromatografia em Gel , Cromatografia por Troca Iônica , Dados de Sequência Molecular , Ressonância Magnética Nuclear Biomolecular , Extratos Vegetais/químicaRESUMO
BACKGROUND: Because of serious adverse effects of centrally acting antitussive agents, is necessary to find new drugs with cough-suppressing activity. Medicinal herbs are a potential source of polysaccharides with high antitussive efficiency and on the other with minimal side effects. AIM: The study was to assess the antitussive action of mixture of a polysaccharides (RL) and polysaccharide-xylan (XY), both isolated from above-ground parts of Rudbeckie fulgida var. sullivantii. The observed activity was compared to those of narcotic and nonnarcotic antitussive substances used in clinical practice. METHODS: Cough was evoked by mechanical irritation of the airways in nonanaesthetized cats with chronic tracheal cannuly. The plant substances were administered perorally in the dose of 50 mg per kg body weight. RESULTS: Results indicate, that administration of RL induced a suppression of the followed cough parameters from both areas of airways (total fall in cough parameters by 46.6%). Administration of xylan induced the fall in the followed cough parameters with more significant influence on the laryngopharyngeal area of the airways (total fall in cough parameters 48.2%). CONCLUSION: Administration of RL and xylan did not achieve the effect of codeine, but had a more intensive antitussive effect than the peripherally acting droprozine and prenoxdiazine. (Fig. 3, Ref. 11.)
Assuntos
Antitussígenos/uso terapêutico , Tosse/tratamento farmacológico , Extratos Vegetais/uso terapêutico , Polissacarídeos/uso terapêutico , Animais , GatosRESUMO
The complex extract and the polysaccharide isolated from the roots of marsh mallow were tested for antitussive activity in unanaesthetized cats of both sexes. Cough was elicited by mechanical stimulation of laryngopharyngeal and tracheobronchial mucous area of the respiratory system with a Nylon fibre (diameter 0.35 mm). Cough was evaluated on the basis of the changes in lateral tracheal pressure. The polysaccharide and the complex extract were administered p.o. in a dose of 50 and 100 mg/kg b.w., respectively. The efficiency of the mentioned compounds was compared with the cough-suppressing effect of drugs belonging to the non-narcotic antitussics. The results of the experiments showed that administration of the polysaccharide led to a statistically significant decrease of the number of cough efforts both from laryngopharyngeal and tracheobronchial areas of the the respiratory system. The polysaccharide in a dose of 50 mg/kg b.w. was as effective in inhibition of the cough reflex as Sirupus Althaeae in a dose of 1000 mg/kg b.w. and more effective than prenoxdiazine in a dose of 30 mg/kg b.w. However, the cough-suppressing effect of the polysaccharide was lower than that of dropropizine. The extract was less effective than the polysaccharide.