Antimicrobial Activity of Volatile Oils from Brazilian Stingless Bees Melipona quadrifasciata quadrifasciata and Tetragonisca angustula Propolis.

Few studies were performed on the volatile components' properties of propolis from native Brazilian stingless bees. This work sought to extract, chemically characterize, and evaluate of the antimicrobial properties of volatile oils from propolis of the stingless bees Melipona quadrifasciata quadrifasciata (MQ) and Tetragonisca angustula (TA). The volatile oils from the pulverized propolis samples were obtained in a Clevenger apparatus and characterized by gas chromatography coupled to mass spectrometry (GC/MS) and to flame ionization detector (GC-FID). All samples showed promising activity against Mycoplasma pneumoniae, with MICs from 103 to 224 µg mL-1 , nonetheless, they were less active against cell walled bacteria. Activity against Candida species was moderate, but one MQ sample showed a MIC value of 103 µg mL-1 against C. tropicallis. Oils' fractionation showed no improvement in antibacterial activity. The promising antibacterial effect against this microorganism is likely related to the synergism between the components of the volatile oils.

Intestinal parasitoses and associated factors in a Brazilian city of German's descendants: a population-based study.

Intestinal parasitoses are a recurrent public health problem in developing countries. Their occurrence is usually associated with poor socioeconomic status and environmental risk factors. This study aims to estimate the prevalence of intestinal parasites and associated risk factors in Pomerode, SC. This was a cross-sectional sample with participants from population-based cohort study SHIP-Brazil (n=2,488). Sociodemographic, lifestyle, and environmental variables were selected from the study database. The stool samples were analyzed by Hoffman, Pons, and Janer, and by Faust methods. We estimated the relative frequency of parasites and its association to the study variable was estimated by prevalence ratio (PR) in a Poisson regression model. Among those who provided stool sample (n=797), the prevalence was 10.8% (95% CI 8.6 to 13.4). Endolimax nana, 4.8% (95% CI, 3.5-6.7) was the most frequent parasite, followed by Entamoeba histolytica/dispar, 1.7% (95% CI, 0.8-3.3), Urbanorum spp., 1.6% (95% CI, 1.0-2.7). Men (PR=1.9 95% CI 1.2-2.9), olders (PR=1.7 95% CI 1.0-2.8), non-white (PR=1.9 95% CI 1.2-3.0), living in high-risk dwelling areas (PR=1.8 95% CI 1.4-2.4) were associated with elevated proportions of parasitosis in the adjusted model. The current study found a low frequency of intestinal parasitoses in Pomerode, SC, Brazil. This frequency was higher among males, older, who live alone, non-white, in low SES, and living in high-risk dwelling areas.

Differential vasodilator effect of Dioclea rostrata lectin in conductance and resistance arteries: Mechanisms and glycoconjugate binding relationships.

Lectins are proteins that recognize specific carbohydrates, and the vasorelaxant effect of legume lectins has been previously reported, for example the Dioclea rostrata lectin (DRL). This study evaluated major pathways of DRL-induced relaxation in different artery segments and the possible molecular interactions involved. Rat thoracic aorta, coronary and mesenteric resistance arteries were tested "in vitro" with concentration-response curves to DRL (0.01-100 µg/mL). L-NAME, indomethacin and high KCl were used to evaluate nitric oxide, cyclooxygenase and hyperpolarization-dependent effects. DRL promoted relaxation of all vessels throughout different mechanisms. L-NAME blunted DRL-induced effects only in the aorta and mesenteric resistance artery. By the use of depolarizing KCl solution, vasodilation was reduced in all arteries, while incubation with indomethacin indicated a role of cyclooxygenase-derived factors for DRL effects in mesenteric and coronary arteries, but not in the aorta. Molecular docking results suggested interactions between DRL and heparan sulphate, CD31 and other glycans present on the membrane surface. These data indicate that the mechanisms involved in DRL-mediated vasodilation vary between conductance and resistance arteries of different origins, and these effects may be related to the capacity of DRL to bind a diversity of glycans, especially heparan sulphate, a proposed mechanoreceptor for nitric oxide synthase and cyclooxygenase activation.

Blockade of angiotensin AT1 receptors prevents arterial remodelling and stiffening in iron-overloaded rats.

BACKGROUND AND PURPOSE: Damage to the vasculature caused by chronic iron-overload in both humans and animal models, is characterized by endothelial dysfunction and reduced compliance. In vitro, blockade of the angiotensin II AT1 receptors reversed functional vascular changes induced by chronic iron-overload. In this study, the effect of chronic AT1 receptor blockade on aorta stiffening was assessed in iron-overloaded rats. EXPERIMENTAL APPROACH: Male Wistar rats were treated for 15 days with saline as control group, iron dextran 200 mg·kg-1 ·day-1 , 5 days a week (iron-overload group), losartan (20 mg·kg-1 ·day-1 in drinking water), and iron dextran plus losartan. Mechanical properties of the aorta were assessed in vivo. In vitro, aortic geometry and biochemical composition were assessed with morphometric and histological methods. KEY RESULTS: Thoracoabdominal aortic pulse wave velocity (PWV) increased significantly, indicating a decrease in aortic compliance. Co-treatment with losartan prevented changes on PWV, ß-index, and elastic modulus in iron-overloaded rats. This iron-related increase in PWV was not related to changes in aortic geometry and wall stress. but to increased elastic modulus/wall stress ratio, suggesting that a change in the composition of the wall was responsible for the stiffness. Losartan treatment also ameliorated the increase in aorta collagen content of the iron-overload group, without affecting circulating iron or vascular deposits. CONCLUSIONS AND IMPLICATIONS: Losartan prevented the structural and functional indices of aortic stiffness in iron-overloaded rats, implying that inhibition of the renin-angiotensin system would limit the vascular remodelling in chronic iron-overload.

Impaired participation of potassium channels and Na+ /K+ -ATPase in vasodilatation due to reduced nitric oxide bioavailability in rats exposed to mercury.

Mercury intoxication is a public health risk factor due to its hazardous effect to several organs, including the cardiovascular system. There is evidence of endothelial dysfunction after exposure to mercury, but the effects on endothelium-dependent vasodilatation are still unknown. In the present study, we aimed to evaluate the chronic effects of high HgCl2 doses on the mechanisms of vasodilatation. Wistar rats were injected with HgCl2 (1st dose 10.86 µg/kg, and daily doses 0.014 µg/kg for 30 days i.m.), and saline was used as control. Mercury exposure reduced the acetylcholine-induced vasodilatation in aortic rings, which was restored by incubation with antioxidant tiron. Inhibition of the NO synthase, Na+ /K+ -ATPase and K+ channels indicates reduced participation of these factors. In the mercury group, there were an increased local anion superoxide and a reduced NO. The vasodilatation to exogenous NO was partially inhibited by co-incubation with TEA plus tiron, suggesting that reduced NO bioavailability is the responsible to that decreased the participation of K+ channels. Moreover, there was an increased participation of the Na+ /K+ -ATPase associated with an up-regulation of its alpha-1 subunit. In conclusion, reduced NO bioavailability plays a major role in the impaired participation of K+ channels and Na+ /K+ -ATPase in the acetylcholine-mediated relaxation, although sodium pump is up-regulated probably as a compensatory mechanism.

Distribution and antifungal susceptibility of Candida species isolated from clinical samples in southern Brazil

Abstract Invasive infections caused by Candida species have been strongly associated with poor prognosis and high resistance rates to some antifungals. This study aimed to identify Candida species isolated from different anatomical sites and to describe their susceptibility profile to antifungals. Ninety-four clinical isolates of Candida were obtained from a Medical Laboratory of Santa Catarina/Brazil. Species identification was performed by MALDI-TOF MS. Susceptibility assays were performed as described by Clinical Laboratory Standard Institute (CLSI) microboth method. Among the analyzed samples, C. albicans was the pathogen most incident (59.9%) followed by C. parapsilosis complex (14.9%), C. glabrata complex (8.5%), and C. tropicalis (6.3%). 37 Candida strains were isolated from vaginal content (39.3%), 21 from the nail (22.4%), 8 from tracheal aspirates (8.5%), and 7 from urine (7.4%). Together, the Candida isolates presented decreased susceptibility to azole drugs, mainly to fluconazole and itraconazole. Amphotericin B showed sensibility in 95.7% of samples analyzed. Previous knowledge about etiology and antifungal susceptibility becomes indispensable to conduct an efficient treatment.

Evaluation of the level of knowledge and prevalence of Toxoplasma gondii infection in pregnant women in Santa Catarina, Brazil

This study aimed to determine the prevalence of Toxoplasma gondii (T. gondii) infection in pregnant women in Santa Catarina, as well as to analyze the knowledge about zoonosis in the study population. Methods: Therefore, 109 volunteers evaluated in Basic Health Units in the city of Blumenau and Brusque were evaluated. The data were collected through questionnaires and analysis of the pregnant woman's handbooks with medical records. Results: In this study, the prevalence of IgG anti-T. gondii was 53.7%, with positivity for IgM anti-T. gondii was 1.0%. Seronegativity for toxoplasmosis was verified in 45.3% of the participants. In addition, the data demonstrated that the majority of pregnant women have not any knowledge of the disease. Conclusion: The results of obtained demonstrated that health actions promotion is crucial to clarify about T. gondii infection, in order to prevent this disease during pregnancy.

O presente trabalho teve por objetivo determinar a prevalência de infecção pelo Toxoplasma gondii (T. gondii) entre gestantes de Santa Catarina, bem como analisar o conhecimento sobre a zoonose na população em estudo. Métodos: Para tanto, foram avaliadas 109 voluntárias atendidas em Unidades Básicas de Saúde dos municípios de Blumenau e Brusque. Os dados foram coletados por meio de questionários e análise de cadernetas da gestante. Resultados: Neste estudo, a prevalência global de anti-T. gondii IgG foi de 53,7%, sendo que a positividade para anti-T. gondii IgM foi de 1,0%. A soronegatividade para toxoplasmose foi verificada em 45,3% das participantes. Além disso, os dados revelaram que a maioria das gestantes não tem conhecimento acerca da doença. Conclusão: Os resultados deste estudo demostraram a necessidade da promoção de ações de saúde voltadas ao esclarecimento sobre o T. gondii visando prevenir a infecção durante a gestação.

Vascular activation of K+ channels and Na+-K+ ATPase activity of estrogen-deficient female rats.

The goal of the present study was to evaluate vascular potassium channels and Na+-K+-ATPase activity in estrogen deficient female rats. Female rats that underwent ovariectomy were assigned to receive daily treatment with placebo (OVX) or estrogen replacement (OVX+E2, 1mg/kg, once a week, i.m.). Aortic rings were used to examine the involvement of K+ channels and Na+-K+-ATPase in vascular reactivity. Acetylcholine (ACh)-induced relaxation was analyzed in the presence of L-NAME (100µM) and K+ channels blockers: tetraethylammonium (TEA, 5mM), 4-aminopyridine (4-AP, 5mM), iberiotoxin (IbTX, 30nM), apamin (0.5mM), charybdotoxin (ChTX, 0.1mM) and iberiotoxin plus apamin. When aortic rings were pre-contracted with KCl (60mM) or pre-incubated with TEA (5mM), 4-aminopyridine (4-AP, 5mM) and iberiotoxin (IbTX, 30nM) plus apamin (0.5µM), the ACh-induced relaxation was less effective in the ovariectomized group. Additionally, 4-AP and IbTX decreased the relaxation by sodium nitroprusside in all groups but this reduction was greater in the ovariectomized group. Estrogen deficiency also increased aortic functional Na+-K+ ATPase activity evaluated by K+-induced relaxation. L-NAME or endothelium removal were not able to block the increase in aortic functional Na+-K+ ATPase activity, however, TEA (5mM) restored this increase to the control level. We also found that estrogen deficiency increased superoxide anion production and reduced nitric oxide release in aortic ring from ovariectomized animals. In summary, our results emphasize that the process underlying ACh-induced relaxation is preserved in ovariectomized animals due to the activation of K+ channels and increased Na+-K+ ATPase activity.

Treatment with high dose of atorvastatin reduces vascular injury in diabetic rats.

BACKGROUND: Previous reports showed conflicting results regarding the treatment effects of statin on Diabetes mellitus (DM). We investigated how treatment with high dose of atorvastatin affects the impaired vascular function in diabetic rats. METHODS: Atorvastatin (80mg/kg/day, oral gavage, 4 weeks) or its vehicle was administered to male control or streptozotocin (STZ)-induced diabetic rats. Aortic segments were used to investigate the vascular reactivity, protein expression of cyclooxygenase-2 (COX-2) and nicotinamide adenine dinucleotide phosphate oxidase (NADPH oxidase) 1 (NOX1) and superoxide anions levels. RESULTS: Atorvastatin treatment did not affect glycemia levels. In diabetic rats, the vascular reactivity to phenylephrine increased compared with controls and the atorvastatin treatment reduced this response. Removal of the endothelium increased the response to phenylephrine in control rats, but not in the diabetic group. Atorvastatin increased the endothelial modulation in diabetic rats. L-NAME (100µM) increased the reactivity in all groups, but this effect was greater in atorvastatin-treated diabetic rats. Indomethacin (10µM) and NS398 (1µM) decreased the contractile response in diabetic rats and atorvastatin reversed these effects, without changing COX-2 expression. Apocynin (30µM) decreased the phenylephrine response in diabetic rats, which also showed increased NOX1 and superoxide anions; these effects were prevented by atorvastatin treatment. CONCLUSIONS: The results suggest that treatment with high dose of atorvastatin, independent of glycemia, improves endothelial function in aortas from diabetic rats by reducing the constrictor prostanoids derived from COX-2 and by reducing the oxidative stress by NADPH oxidase, as well as a possible increasing of nitric oxide participation.

Incidência de dermatofitoses em cães no período de janeiro de 2016 a janeiro de 2018 em um laboratório veterinário de análises clínicas na cidade de Chapecó ­ SC / Incidence of dermatophytes in dogs in the period from january 2016 to january 2018 in a veterinary laboratory of clinical analisis in the city of Chapecó - SC

Objetivo: Tendo em vista a possibilidade de variação na incidência e prevalência das dermatofitoses de uma região geográfica para outra, e seu potencial zoonótico, o presente trabalho teve como objetivo fornecer dados a respeito da frequência de dermatofitoses em cães na cidade de Chapecó-SC. Métodos: Avaliaram-se resultados de exames micológico direto e cultura fúngica de caninos, emitidos por um laboratório particular de análises clínicas veterinárias na cidade de Chapecó, Santa Catarina. Os dados foram coletados do sistema Multvet e analisados por meio do software IBM SPSS 22.0 através do cálculo de frequência. Resultados: No período compreendido foram solicitados 108 exames para micológico direto e 223 para cultura fúngica. Destes, 81 laudos de micológico direto (75%) e 159 laudos de cultura fúngica (71%) atendiam aos critérios de inclusão, sendo a maioria dos resultados pertencentes a fêmeas com idade entre 1 e 8 anos, sem raça definida (SRD); além disso verificou-se que não houve diferença significativa entre as solicitações dos exames por estação do ano. A respeito da espécie de dermatófito isolado na cultura fúngica, corroborando com demais estudos, o Microsporum canis foi o mais frequente. Conclusão: Visto que as dermatofitoses são consideradas doenças com potencial zoonótico, e sua epidemiologia é conhecida por mudar ao longo do tempo, os resultados desta pesquisa mostraram que tanto o papel do médico veterinário quanto o do patologista clínico são de suma importância para o prognóstico favorável do paciente.

Objective: Given the possibility of occurrence of variance and prevalence of dermatophytosis from one geographical region to another, and its zoonotic potential, the present study had an impact on the frequency of dermatophytosis in dogs in the city of Chapecó SC. Methods: Evaluation of results obtained through direct mycological examination and canine culture issued by a private veterinary clinical anamnesis laboratory in the city of Chapecó, Santa Catarina, with data collected by the IBM SPSS 22.0 system through frequency calculation. Results: No complete year, 108 direct microbial and 223 religious culture tests were requested, at the same time, 81 direct micrological compliments (75%) and 159 fungal culture reports (71%) within inclusion lips, a large majority of the results belonged to female dog aged 1 to 8 years, with no defined race (SRD), and it was found that there was no major difference between examinations by season. Treating the resistance of sexual dermatitis in fungal culture, corroborating other Dermatophytosis is a closed disease with zoonotic potential, and its epidemiology is known to change over time. The results of the research are as important as the role of the veterinarian in clinical pathology are important for the favorable prognosis of the disease patient.

Strongyloides stercoralis hyperinfection in a renal transplant recipient

Strongyloidiasis is a worldwide intestinal infection produced by the nematode Strongyloides stercoralis. In this study, we report the case of a 47-year-old female patient who was submitted to renal transplant and an immunosuppression regimen. She was admitted to the emergency service with intense abdominal pain, evolving to an acute respiratory insufficiency, gram-negative bacteremia, refractory shock and death. S. stercoralis larvae were identified in the parasitological exam and bronchoalveolar lavage. This provides evidence for the importance of the early diagnosis of this neglected helminthiasis in transplanted patients undergoing immunosuppresive therapy

High prevalence of HBV carriers among waste collectors in the largest landfill in Latin America

Hepatitis B virus (HBV) is a serious public health problem. Some professions are at an increased risk for HBV infection, such as recyclable waste collectors. In this study, the aim was to evaluate the prevalence of HBV carriers and vaccination coverage among waste collectors in the largest landfill in the Rio de Janeiro metropolitan area, as well as to determine the association between risk factors and HBV infection in the studied population. In this study 73 participants answered a questionnaire on their socio-demographic variables and occupational exposure to waste. All of the subjects in the study were tested for HBsAg and their vaccination cards were evaluated in order to assess their HBV vaccination status. The vaccination coverage among the individuals who had a vaccination card was 57.4%. The overall prevalence of HBsAg was 12.3%. The prevalence of HBsAg was significantly higher among men (p = 0.002). However, no statistical differences were found in the prevalence of HBsAg between individuals with a history of occupational accidents involving sharp edges and non-injured individuals (p = 0.267). The results of this study demonstrate the need to strengthen prevention measures and increase HBV vaccination among waste collectors.

Micoses superficiais em pacientes com Diabetes Mellitus atendidos em um ambulatório geral em Blumenau, SC / Superficial mycoses in patient with Diabetes Mellitus served in a general outpatient clinic in Blumenau, SC

O Diabetes Mellitus (DM) caracteriza-se por uma síndrome clínica de evolução crônica e degenerativa, decorrente de distúrbio na secreção e/ou ação da insulina no organismo, que determina um conjunto de alterações metabólicas, caracterizadas,principalmente, pela hiperglicemia. Os indivíduos portadores de DM são, em geral, indivíduos vulneráveis a uma série de complicações de natureza infecciosa, como os processos bacterianos, fúngicos e virais. As micoses mais frequentemente encontradas são causadas por fungos dermatófitos e leveduras do gênero Candida. O objetivo deste estudo foi analisar a frequência de infecção fúngica em portadores de DM atendidos em um ambulatório geral, em Blumenau, SC. Métodos: O diagnóstico laboratorial foi feito através de métodos tradicionais, incluindo exame micológico direto e cultura. Resultados: Constatou-se que, dentre os indivíduos avaliados, 36% apresentaram resultado positivo,sendo que, desses, 86% apresentaram lesão por Candida spp. e 14% por dermatófitos, o qual foi identificado como Trichophyton mentagrophytes na cultura. Conclusão: A maior frequência de Candida spp. pode estar relacionada à imunossupressão ocasionada pelo Diabetes Mellitus. Com este estudo, pode-se demonstrar a importância do diagnóstico laboratorial precoce das infecções fúngicas em indivíduos com Diabetes Mellitus...