RESUMO
Plasmid-encoded toxin (Pet) is an autotransporter protein of the serine protease autotransporters of Enterobacteriaceae (SPATE) family, important in the pathogenicity of Escherichia coli. The pet gene was initially found in the enteroaggregative E. coli (EAEC) virulence plasmid, pAA2. Although this virulence factor was initially described in EAEC, an intestinal E. coli pathotype, pet may also be present in other pathotypes, including extraintestinal pathogenic strains (ExPEC). The complement system is an important defense mechanism of the immune system that can be activated by invading pathogens. Proteases produced by pathogenic bacteria, such as SPATEs, have proteolytic activity and can cleave components of the complement system, promoting bacterial resistance to human serum. Considering these factors, the proteolytic activity of Pet and its role in evading the complement system were investigated. Proteolytic assays were performed by incubating purified components of the complement system with Pet and Pet S260I (a catalytic site mutant) proteins. Pet, but not Pet S260I, could cleave C3, C5 and C9 components, and also inhibited the natural formation of C9 polymers. Furthermore, a dose-dependent inhibition of ZnCl2-induced C9 polymerization in vitro was observed. E. coli DH5α survived incubation with human serum pre-treated with Pet. Therefore, Pet can potentially interfere with the alternative and the terminal pathways of the complement system. In addition, by cleaving C9, Pet may inhibit membrane attack complex (MAC) formation on the bacterial outer membrane. Thus, our data are suggestive of a role of Pet in resistance of E. coli to human serum.
Assuntos
Toxinas Bacterianas , Infecções por Escherichia coli , Proteínas de Escherichia coli , Humanos , Escherichia coli/metabolismo , Toxinas Bacterianas/metabolismo , Proteínas de Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo , Proteínas do Sistema Complemento/metabolismo , Serina Proteases/metabolismo , Infecções por Escherichia coli/microbiologia , Plasmídeos/genéticaRESUMO
The removal of dead cells (efferocytosis) contributes to the resolution of the infection and preservation of the tissue. Depending on the environment milieu, macrophages may show inflammatory (M1) or anti-inflammatory (M2) phenotypes. Inflammatory leukocytes are recruited during infection, followed by the accumulation of infected and non-infected apoptotic cells (AC). Efferocytosis of non-infected AC promotes TGF-ß, IL-10, and PGE2 production and the polarization of anti-inflammatory macrophages. These M2 macrophages acquire an efficient ability to remove apoptotic cells that are involved in tissue repair and resolution of inflammation. On the other hand, the impact of efferocytosis of infected apoptotic cells on macrophage activation profile remains unknown. Here, we are showing that the efferocytosis of gram-positive Streptococcus pneumoniae-AC (Sp-AC) or gram-negative Klebsiella pneumoniae-AC (Kp-AC) promotes distinct gene expression and cytokine signature in macrophages. Whereas the efferocytosis of Kp-AC triggered a predominant M1 phenotype in vitro and in vivo, the efferocytosis of Sp-AC promoted a mixed M1/M2 activation in vitro and in vivo in a model of allergic asthma. Together, these findings suggest that the nature of the pathogen and antigen load into AC may have different impacts on inducing macrophage polarization.
Assuntos
Apoptose , Fagocitose , Macrófagos/metabolismo , Fenótipo , Anti-InflamatóriosRESUMO
O ingresso em um curso universitário leva a mudanças significativas no estilo de vida e na rotina do estudante, com impacto na prática de atividade física, saúde mental, hábitos de sono e hábitos alimentares. O objetivo do estudo foi verificar o nível de atividade física dos jovens universitários e suas associações com estado de humor, qualidade do sono e consumo alimentar. Trata-se de uma pesquisa de corte transversal, realizada com estudantes universitários do curso de Medicina de uma Instituição de Ensino Superior Pública. Realizou-se avaliação de medidas antropométricas, do nível de atividade física (NAF) por meio do acelerômetro GT3x (Actigraph), do consumo alimentar (inventário de 24h), e utilizando os questionários de BECK e BRUMs / POMS avaliou-se os distúrbios de sono e estado de humor. Utilizando o software SPSS realizou análise comparativa com teste t Student para grupos independentes, análise inferencial de correlação de Pearson e Regressão logística binária. Dos universitários analisados (n=75), 54,7% (n=41) eram do sexo masculino e, quando comparado com as mulheres, apresentaram maior nível de atividade física (NAF). Aproximadamente 1/3 de toda a amostra do estudo realizou menos de 300min de atividade física moderada/vigorosa. O perfil alimentar dos universitários não foi satisfatório. Verificou-se para ambos os sexos o Escore Total de POMS (Profile of Mood States) se associou com universitários que realizam menos de 300min de atividade física por semana. As mulheres têm 65% mais chances de apresentar Escala de Tensão (POMS) quando são menos ativas, e nos homens, a razão de chances é de aproximadamente três vezes maior de apresentar Confusão (BRUMS - Escala de Humor de Brunel). Conclui-se que os estudantes universitários do curso estudado, em sua maioria, foram insuficientemente ativos fisicamente e apresentam algumas alterações no estado de humor, sonolência diurna e um consumo alimentar insatisfatório.
Starting a university course leads to significant changes in the student's lifestyle and routine, with an impact on physical activity, mental health, sleeping habits and eating habits. The objective of the study was to verify the level of physical activity of young university students and its associations with mood, sleep quality and food consumption. This is a cross-sectional survey, carried out with university students studying Medicine at a Public Higher Education Institution. Anthropometric measurements, physical activity level (PAL) were assessed using the GT3x accelerometer (Actigraph), food consumption (24-hour inventory), and using the BECK and BRUMs / POMS questionnaires, health disorders were assessed. sleep and mood. Using SPSS software, comparative analysis was carried out with Student's t test for independent groups, Pearson correlation inferential analysis and binary logistic regression. Of the university students analyzed (n=75), 54.7% (n=41) were male and, when compared to women, they had a higher physical activity level (PAL). Approximately 1/3 of the entire study sample performed less than 300 minutes of moderate/vigorous physical activity. The dietary profile of university students was not satisfactory. For both sexes, the POMS Total Score (Profile of Mood States) was found to be associated with university students who perform less than 300 minutes of physical activity per week. Women are 65% more likely to present with Tension Scale (POMS) when they are less active, and in men, the odds ratio is approximately three times greater for presenting Confusion (BRUMS - Brunel Mood Scale). It is concluded that the majority of university students on the course studied were insufficiently physically active and presented some changes in mood, daytime drowsiness and unsatisfactory food consumption.
RESUMO
Objetivo: Comparar as metodologias de impedância e óptica para contagem de eritrócitos (RBC) e dosagem de hemoglobina (HGB) como forma de corrigir a contagem de eritrócitos em casos de pacientes que apresentam índice de concentração de hemoglobina corpus- cular média (CHCM) acima do ponto de corte. Métodos: Para comparar as metodologias, foram utilizadas amostras com CHCM normal e aumentado. Os parâmetros avaliados foram RBC, HGB e CHCM. Resultados: As amostras com valores de CHCM aumentado demonstraram uma correlação significativa entre RBC e HGB, porém o CHCM apresen- tou uma correlação fraca. Observamos que a metodologia por impedância obteve maior sucesso na correção do CHCM quando as amostras apresentavam aglutinação. Conclusão: A metodologia óptica é uma boa alternativa para correção de valores aumentados de CHCM em situações específicas, mas para casos de aglutinação não se mostrou efetiva.
Objetctive: Compare the impedance and optical methodologies for red blood cells (RBC) count and hemoglobin (HGB) measurement as a way to correct the RBC count in cases of patients who have a MCHC index above the cutoff. Methods: To compare the methodologies, samples with normal and augmented MCHC were used. The parameters evaluated were RBC, HGB and MCHC. Results: Samples with increased MCHC values demonstrated a significant correlation between RBC and HGB, but the MCHC showed a weak correlation. We observed that the impedance methodology was more successful in correcting the MCHC when the samples presented agglutination. Conclusion: Optical methodology is a good alternative for correction of increased CHCM values in specific situations, but for cases of agglutination it has not been shown to be effective.
RESUMO
Patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) may present a significant hypoxemia. The exactly mechanism of such hypoxemia in patients with coronavirus disease 2019 (COVID-19) is not well described. It has been suggested that microthrombosis contributes to this mechanism, increasing pulmonary dead space. However, dead spaces would not be sensible to oxygen supplementation, and also, enlargement of pulmonary vessels it has been evidenced. Shunt mechanism by vasodilatation, instead, could explain decubitus dependence in oxygenation by blood redistribution as observed in these patients, and moreover, would be more sensible to oxygen supplementation than dead spaces. We hypothesized that SARS-CoV-2 causes an intrapulmonary vascular dilatation (IPVD), determining a shunt mechanism by vasodilatation. We performed contrast-enhanced transthoracic echocardiography to search IPVD shunt in patients with confirmed COVID-19, hospitalized in an intensive care unit. Ten patients were recruited; one patient was excluded due to low quality of echocardiographic image, and nine patients were included. IPVD was found in seven (78%) patients, with different grades, including patient with normal compliance and the one without invasive ventilation. We demonstrated that shunt by IPVD is present among patients with COVID-19, and this mechanism is probably implicated in significant hypoxemia observed.
Assuntos
COVID-19/patologia , Pulmão/irrigação sanguínea , SARS-CoV-2 , Vasodilatação , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
The increase in the commercialization of sheep products requires an equivalent improvement in flock health and rapid disease identification. Data regarding the cause of death in sheep were reviewed from the database of the "Setor de Patologia Veterinária" from the "Universidade Federal do Rio Grande do Sul", from January 2004 and December 2019. Epidemiological features, such as breed, sex, and age, in addition to the clinical and pathological features, were analyzed. During this period, tissues from 523 sheep were evaluated, in which a conclusive diagnosis was obtained in 457 (87%) of the cases. The majority of sheep were from the metropolitan mesoregion of Porto Alegre. The most common breed was Texel 171/523 (33%). From all the conclusive diagnoses, 158/457 (35%) corresponded to infectious non-parasitic diseases, 117/457 (26%) were caused by toxic etiology, 95/457 (21%) were infectious parasitic diseases, 42/457 (9%) were included in the nutritional and metabolic category, 38/457 (8%) were in the "others" category, and 7/457 (1.5%) were congenital defects. The age of sheep included in this study ranged from 1 day to 7 years. Among cases with conclusive diagnosis, the main cause of death was haemonchosis with 83/457 (18%) of cases, followed by pneumonia 29/457 (6%), Baccharis sp. poisoning 25/457 (5%), and bluetongue 22/457 (5%).(AU)
O aumento da comercialização de produtos ovinos requer um aumento equivalente na sanidade do rebanho e uma rápida identificação de doenças. Os dados sobre as causas de morte em ovinos foram revisados no banco de dados do Setor de Patologia Veterinária da Universidade Federal do Rio Grande do Sul, entre janeiro de 2004 e dezembro de 2019. Aspectos epidemiológicos, como raça, sexo e idade, além das características clínicas e patológicas, foram compilados. Nesse período, foram avaliados tecidos de 523 ovinos, em que o diagnóstico conclusivo foi obtido em 457 (87%) dos casos. A grande maioria dos ovinos era da mesorregião metropolitana de Porto Alegre. A raça mais comum foi Texel 171/523 (33%). De todos os diagnósticos conclusivos, 158/457 (35%) corresponderam a doenças infecciosas não-parasitárias, 117/457 (26%) foram causadas por doenças tóxicas, 95/457 (21%) doenças infecciosas parasitárias, 42/457 (9%) foram incluídos na categoria nutricional e metabólica, 38/457 (8%) foram classificadas na categoria "outros", e 7/457 (1,5%) eram defeitos congênitos. A faixa etária das ovelhas incluídas neste estudo foi de um dia a sete anos de idade. Entre os casos com diagnóstico conclusivo, a principal causa de óbito foi hemoncose com 83/457 (18%) dos casos, seguida de pneumonia 29/457 (6%), intoxicação por Baccharis sp. 25/457 (5%), e infecção pelo vírus da língua azul 22/457 (5%).(AU)
Assuntos
Animais , Patologia Veterinária , Anormalidades Congênitas , Ovinos , DoençaRESUMO
ABSTRACT: The increase in the commercialization of sheep products requires an equivalent improvement in flock health and rapid disease identification. Data regarding the cause of death in sheep were reviewed from the database of the Setor de Patologia Veterinária from the Universidade Federal do Rio Grande do Sul, from January 2004 and December 2019. Epidemiological features, such as breed, sex, and age, in addition to the clinical and pathological features, were analyzed. During this period, tissues from 523 sheep were evaluated, in which a conclusive diagnosis was obtained in 457 (87%) of the cases. The majority of sheep were from the metropolitan mesoregion of Porto Alegre. The most common breed was Texel 171/523 (33%). From all the conclusive diagnoses, 158/457 (35%) corresponded to infectious non-parasitic diseases, 117/457 (26%) were caused by toxic etiology, 95/457 (21%) were infectious parasitic diseases, 42/457 (9%) were included in the nutritional and metabolic category, 38/457 (8%) were in the others category, and 7/457 (1.5%) were congenital defects. The age of sheep included in this study ranged from 1 day to 7 years. Among cases with conclusive diagnosis, the main cause of death was haemonchosis with 83/457 (18%) of cases, followed by pneumonia 29/457 (6%), Baccharis sp. poisoning 25/457 (5%), and bluetongue 22/457 (5%).
RESUMO: O aumento da comercialização de produtos ovinos requer um aumento equivalente na sanidade do rebanho e uma rápida identificação de doenças. Os dados sobre as causas de morte em ovinos foram revisados no banco de dados do Setor de Patologia Veterinária da Universidade Federal do Rio Grande do Sul, entre janeiro de 2004 e dezembro de 2019. Aspectos epidemiológicos, como raça, sexo e idade, além das características clínicas e patológicas, foram compilados. Nesse período, foram avaliados tecidos de 523 ovinos, em que o diagnóstico conclusivo foi obtido em 457 (87%) dos casos. A grande maioria dos ovinos era da mesorregião metropolitana de Porto Alegre. A raça mais comum foi Texel 171/523 (33%). De todos os diagnósticos conclusivos, 158/457 (35%) corresponderam a doenças infecciosas não-parasitárias, 117/457 (26%) foram causadas por doenças tóxicas, 95/457 (21%) doenças infecciosas parasitárias, 42/457 (9%) foram incluídos na categoria nutricional e metabólica, 38/457 (8%) foram classificadas na categoria outros, e 7/457 (1,5%) eram defeitos congênitos. A faixa etária das ovelhas incluídas neste estudo foi de um dia a sete anos de idade. Entre os casos com diagnóstico conclusivo, a principal causa de óbito foi hemoncose com 83/457 (18%) dos casos, seguida de pneumonia 29/457 (6%), intoxicação por Baccharis sp. 25/457 (5%), e infecção pelo vírus da língua azul 22/457 (5%).
RESUMO
The increase in the commercialization of sheep products requires an equivalent improvement in flock health and rapid disease identification. Data regarding the cause of death in sheep were reviewed from the database of the "Setor de Patologia Veterinária" from the "Universidade Federal do Rio Grande do Sul", from January 2004 and December 2019. Epidemiological features, such as breed, sex, and age, in addition to the clinical and pathological features, were analyzed. During this period, tissues from 523 sheep were evaluated, in which a conclusive diagnosis was obtained in 457 (87%) of the cases. The majority of sheep were from the metropolitan mesoregion of Porto Alegre. The most common breed was Texel 171/523 (33%). From all the conclusive diagnoses, 158/457 (35%) corresponded to infectious non-parasitic diseases, 117/457 (26%) were caused by toxic etiology, 95/457 (21%) were infectious parasitic diseases, 42/457 (9%) were included in the nutritional and metabolic category, 38/457 (8%) were in the "others" category, and 7/457 (1.5%) were congenital defects. The age of sheep included in this study ranged from 1 day to 7 years. Among cases with conclusive diagnosis, the main cause of death was haemonchosis with 83/457 (18%) of cases, followed by pneumonia 29/457 (6%), Baccharis sp. poisoning 25/457 (5%), and bluetongue 22/457 (5%).(AU)
O aumento da comercialização de produtos ovinos requer um aumento equivalente na sanidade do rebanho e uma rápida identificação de doenças. Os dados sobre as causas de morte em ovinos foram revisados no banco de dados do Setor de Patologia Veterinária da Universidade Federal do Rio Grande do Sul, entre janeiro de 2004 e dezembro de 2019. Aspectos epidemiológicos, como raça, sexo e idade, além das características clínicas e patológicas, foram compilados. Nesse período, foram avaliados tecidos de 523 ovinos, em que o diagnóstico conclusivo foi obtido em 457 (87%) dos casos. A grande maioria dos ovinos era da mesorregião metropolitana de Porto Alegre. A raça mais comum foi Texel 171/523 (33%). De todos os diagnósticos conclusivos, 158/457 (35%) corresponderam a doenças infecciosas não-parasitárias, 117/457 (26%) foram causadas por doenças tóxicas, 95/457 (21%) doenças infecciosas parasitárias, 42/457 (9%) foram incluídos na categoria nutricional e metabólica, 38/457 (8%) foram classificadas na categoria "outros", e 7/457 (1,5%) eram defeitos congênitos. A faixa etária das ovelhas incluídas neste estudo foi de um dia a sete anos de idade. Entre os casos com diagnóstico conclusivo, a principal causa de óbito foi hemoncose com 83/457 (18%) dos casos, seguida de pneumonia 29/457 (6%), intoxicação por Baccharis sp. 25/457 (5%), e infecção pelo vírus da língua azul 22/457 (5%).(AU)
Assuntos
Animais , Patologia Veterinária , Anormalidades Congênitas , Ovinos , DoençaRESUMO
A Escherichia coli Enteroagregativa (EAEC) é uma bactéria Gram-negativa facultativa relacionada a casos de diarreia aguda e persistente em crianças e adultos. Este patótipo é caracterizado pelo padrão de aderência agregativa às células epiteliais e é considerado um patógeno emergente. Um dos seus fatores de virulência é a Plasmid-encoded toxin (Pet), uma proteína autotransportadora do grupo das SPATEs (Serino Proteases Autotransportadoras de Enterobacteriaceae), que desempenha um papel importante na patogenicidade da EAEC. O gene pet é albergado pelo pAA2 e, apesar de ser um fator de virulência típico da EAEC, Pet também está presente em outros patótipos de Escherichia coli. O sistema complemento é um importante mecanismo da imunidade inata. Este sistema funciona em cascata e pode ser ativado após a invasão de patógenos. Foi demonstrado na literatura que proteases produzidas por bactérias patogênicas apresentam atividade proteolítica contra componentes do sistema complemento, promovendo evasão do sistema imunológico. Considerando esses fatores, investigamos se Pet apresenta ação proteolítica sobre os componentes do sistema complemento C3, C3b, C4, C4b e C5. O sobrenadante do clone mínimo HB101 (pCEFN) foi utilizado nos ensaios proteolíticos. Os sobrenadantes foram incubados com os componentes do complemento por 5 e 24 horas a 37oC. Produtos de degradação foram analisados por Western Blot utilizando anticorpos primários específicos produzidos. Além disso, ensaios proteolíticos utilizando um inibidor de serino proteases, ensaios proteolíticos com os fatores I e H e ensaios de resistência ao soro humano pré-tratado com Pet foram realizados. De acordo com os resultados obtidos, verificamos que Pet degradou todos os componentes do sistema complemento testados, podendo interromper as três vias de ativação da cascata, Pet por si só é capaz de degradar os componentes do sistema complemento e a Escherichia coli HB101 sobreviveu ao soro humano pré-tratado com a Pet. A toxina Pet pode ser, portanto, um importante fator de virulência relacionado à resistência ao soro, que pode contribuir para que as Escherichia coli causem infecções extraintestinais e sepse.
RESUMO
BACKGROUND: Central venous catheters are devices used for therapeutic, diagnostic, and monitoring purposes. Complications associated with central venous catheter use include those related to their insertion, rupture and displacement of the catheter, occlusion, thrombosis, and infection. Of these the latter is important due to the high morbidity and mortality it causes in the patients, and total parenteral nutrition increases the risk. The aim of this study is determine the incidence and risk factors associated with catheter-related infection in patients on parenteral nutrition. MATERIAL AND METHODS: A retrospective, observational, and cross-sectional study was conducted, by analysing patients on total parenteral nutrition who developed a catheter-related infection in a 6-month period. Multiple variables were studied, looking for significance. A statistically significant relationship was considered with a p<0.05. RESULTS: The study consisted of 85 patients, of whom 52% were women and 48% men. The median age was 54 years. The most frequent diagnosis was enterocutaneous fistula. Catheter associated infection was present in 19% of patients. The most frequent microorganisms found were Staphyloccocus sp. (44%) and Candida sp. (25%). Median time between central venous catheter insertion and infection was 78±64 days. There was a significance between days with a central venous catheters and infection development (p=0.014). Infection developed in 81% of patients on whom surgery was performed (p<0.05) CONCLUSION: It was found that patients with a longer use of a central venous catheter (p=0.014) and those who were operated on in conjunction with total parenteral nutrition (p<0.05) were more prone to develop a catheter-associated infection.