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Rev. Soc. Bras. Med. Trop ; 52: e20180254, 2019. graf
Article in English | LILACS | ID: biblio-985162


Abstract INTRODUCTION: Antimicrobial resistance has been reported in the drugs used for the treatment of typhoid fever. The immunomodulatory substance β-glucan can be used as an alternative therapy as it potentiates host immunity. The aims of this study are to observe the effect of Candida albicans cell wall (CCW) extract towards host immunity (TCD8+ and TCD4+ cells in spleen, intestinal sIgA) and its capacity to kill Salmonella in the intestine and liver of typhoid fever mice models. METHODS: Typhoid fever mice models were created by infecting mice with S. Typhimurium orally. Mice were divided into four groups: the Non-Infected, Infected, CCW (infected mice treated with 300 µg CCW extract/mouse once a day), and Ciprofloxacin groups (infected mice treated with 15 mg/kg BW ciprofloxacin twice a day). RESULTS: Secretory IgA (sIgA) concentrations of mice in the CCW group remained unchanged. However, their TCD4+ and TCD8+ cells increased substantially compared to those in the Non-Infected group. In the Ciprofloxacin group, sIgA concentrations increased markedly compared to those in the Non-Infected and CCW groups; TCD4+ and TCD8+ cells also increased significantly compared to those in the Infected Group, but not significant compared to those in the CCW group. Colonization of S. Typhimurium in the intestine and liver decreased significantly in the CCW and Ciprofloxacin groups compared to that in the Infected group, with the lowest reduction being found in the Ciprofloxacin group. CONCLUSIONS The inhibition of S. Typhimurium colonization by CCW is associated with the increase in TCD4+ and TCD8+ cells.

Animals , Male , Salmonella typhimurium/drug effects , Typhoid Fever/microbiology , Candida albicans/chemistry , beta-Glucans/pharmacology , Immunoglobulin A, Secretory , CD4-Positive T-Lymphocytes/microbiology , Ciprofloxacin , Microbial Sensitivity Tests , Cell Wall , CD8-Positive T-Lymphocytes/microbiology , Disease Models, Animal , Immunity, Cellular/immunology , Intestines/microbiology , Liver/microbiology , Mice , Mice, Inbred BALB C
Acta cir. bras ; 31(3): 198-205, Mar. 2016. tab, graf
Article in English | LILACS | ID: lil-777088


ABSTRACT PURPOSE: To investigate the protective effect of Bg on cisplatin (CP)-induced neurotoxicity in rats. METHODS: Twenty eight rats were randomly distributed into four groups. The first group was kept as a control. In the second group, CP was given at the single dose of 7 mg/kg intraperitoneally. In the third group, βg was orally administered at the dose of 50 mg/kg/day for 14 days. In the fourth group, CP and βg were given together at the same doses. RESULTS: CP treatment caused significant oxidative damage via induction of lipid peroxidation and reductions antioxidant defense system potency in the brain tissue. In addition, histopathological damage increased with CP treatment. On the other hand, βg treatment largely prevented oxidative and histopathological negative effects of CP. CONCLUSIONS: Cisplatin has severe neurotoxic effects in rats and βg supplementation has significant beneficial effects against CP toxicity depending on its antioxidant properties. Thus, it appears that βg might be useful against CP toxicity in patients with cancer in terms of nervous system.

Animals , Male , Brain/drug effects , Brain Diseases/prevention & control , Cisplatin/adverse effects , beta-Glucans/pharmacology , Antineoplastic Agents/adverse effects , Brain/metabolism , Brain/pathology , Brain Diseases/chemically induced , Brain Diseases/pathology , Random Allocation , Cerebral Cortex/drug effects , Cerebral Cortex/metabolism , Cerebral Cortex/pathology , Cisplatin/metabolism , Rats, Sprague-Dawley , Oxidative Stress , Protective Agents/pharmacology , Models, Animal , Antineoplastic Agents/metabolism
Acta cir. bras ; 21(supl.4): 18-22, 2006.
Article in English | LILACS | ID: lil-440773


PURPOSE: To investigate the role of beta-(1-3)-D-glucan on 99mTc labelled Escherichia coli translocation and cytokines secretion in rats submitted to small bowel ischemia/reperfusion injury. METHODS: Five groups (n=10 each) of Wistar rats were subjected to control(C), sham(S), group IR subjected to 45 min of bowel ischemia/60 min of reperfusion(I/R), and group I/R+glucan subjected to 45 min of bowel ischemia/60 min of reperfusion(I/R) and injected with 2mg/Kg intramuscular. Translocation of labelled bacteria to mesenteric lymph nodes, liver, spleen, lung and serum was determined using radioactivity/count and colony forming units/g(CFU/g). Serum TNFalpha, IL-1beta, IL-6, IL-10 were measured by ELISA. RESULTS: CFU/g and radioactivity/count were higher in I/R than in I/R+glucan rats. In C, S and S+glucan groups, bacteria and radioactivity/count were rarely detected. The I/R+glucan rats had enhancement of IL-10 and suppressed production of serum TNFalpha, IL-1beta and, IL-6, compared to I/R untreated animals. CONCLUSION: The beta-(1-3)-D-glucan modulated the production of pro-inflammatory and anti-inflammatory cytokines during bowel ischemia/reperfusion, and attenuated translocation of labelled bacteria.

OBJETIVO: Investigar o papel da beta-(1-3)-D-glucana na translocação de Escherichia coli marcada com 99mTc e na secreção de citocinas em ratos submetidos a isquemia e reperfusão intestinal. MÉTODOS: Cinco grupos (n=10 cada) de ratos Wistar foram denominados controle (C), sham (S), grupo IR submetido a 45 minutos de isquemia do intestino delgado e 60 minutos de reperfusão(I/R), grupo I/R+glucana com 45 minutos de isquemia e 60 minutos de reperfusão(I/R) e tratados com glucana 2mg/Kg intramuscular. Translocação de Escherichia coli marcada com 99mTc, para Linfonodos mesentéricos, fígado, baço, pulmão e soro foi avaliada usando contagem de radioatividade e de unidades formadoras de colônias/g (UFC/g) Dosagem sérica de TNFalfa, IL-1beta, IL-6, IL-10 foi realizada pelo método ELISA. RESULTADOS: CFU/g e contagem de radioatividade foi significantemente maior nos ratos do grupo I/R do que no grupo I/R+glucana. Nos grupos C, S e S+glucana bactérias e contagem radioativa foram raramente detectadas. Os ratos do grupo I/R+glucana tiveram aumento de IL-10 sérica e significante redução da expressão de TNFalfa, IL-1beta e IL-6, quando comparados com os animais não tratados do grupo I/R. CONCLUSÃO: A beta-(1-3)-D-glucana modulou a produção de citocinas pró-inflamatórias e anti-inflamatórias durante a isquemia/reperfusão intestinal e contribuiu para reduzir a translocação de bactérias marcadas.

Animals , Male , Rats , Bacterial Translocation/drug effects , Escherichia coli/physiology , Intestine, Small/blood supply , Reperfusion Injury/prevention & control , beta-Glucans/pharmacology , Bacterial Translocation/physiology , Colony Count, Microbial , Cytokines/biosynthesis , Cytokines , Disease Models, Animal , Inflammation Mediators/physiology , Intestinal Mucosa/microbiology , Intestinal Mucosa/physiology , Rats, Wistar , Reperfusion Injury/microbiology , Tumor Necrosis Factor-alpha/blood
Braz. j. med. biol. res ; 38(6): 885-893, June 2005. tab, graf
Article in English | LILACS | ID: lil-402660


ß-Glucans are soluble fibers with physiological functions, such as interference with absorption of sugars and reduction of serum lipid levels. The objective of the present study was to analyze the distribution of ß-glucans in different tissues of the African grass species Rhynchelytrum repens and also to evaluate their hypoglycemic activity. Leaf blades, sheaths, stems, and young leaves of R. repens were submitted to extraction with 4 M KOH. Analysis of the fractions revealed the presence of arabinose, glucose, xylose, and traces of rhamnose and galactose. The presence of ß-glucan in these fractions was confirmed by hydrolyzing the polymers with endo-ß-glucanase from Bacillus subtilis, followed by HPLC analysis of the characteristic oligosaccharides produced. The 4 M KOH fractions from different tissues were subjected to gel permeation chromatography on Sepharose 4B, with separation of polysaccharides with different degrees of polymerization, the highest molecular mass (above 2000 kDa) being found in young leaves. The molecular mass of the leaf blade polymers was similar (250 kDa) to that of maize coleoptile ß-glucan used for comparison. The 4 M KOH fraction injected into rats with streptozotocin-induced diabetes showed hypoglycemic activity, reducing blood sugar to normal levels for approximately 24 h. This performance was better than that obtained with pure ß-glucan from barley, which decreased blood sugar levels for about 4 h. These results suggest that the activity of ß-glucans from R. repens is responsible for the use of this plant extract as a hypoglycemic drug in folk medicine.

Animals , Male , Rats , Diabetes Mellitus, Experimental/drug therapy , Hypoglycemic Agents/pharmacology , Poaceae/chemistry , Polysaccharides/pharmacology , beta-Glucans/pharmacology , Chromatography, High Pressure Liquid , Hypoglycemic Agents/isolation & purification , Plant Extracts/pharmacology , Polysaccharides/isolation & purification , Rats, Wistar , beta-Glucans/isolation & purification