RESUMO
The rupture of the Fundão mine dam in Mariana municipality, Minas Gerais State, Brazil, spilled the tailings across the Doce River basin. These tailings, composed of residues discarded from the beneficiation of iron ore, are rich in SiO and AlO, as well as some ether amine compounds and NaOH. The aim of this study was to assess the distribution of these sediments, as well as their effect on the riparian zones reached, as compared with preserved sites. Sediment deposition in the river resulted in a morphological change from a meandering profile to a braided aspect. The nutrient and mineral content (P, K, Ca, Mg, Cu, Fe, Mn, Zn, and NO) and soil organic matter of the sediments were depleted, whereas NH, Na, and pH increased. A random presence of ether amines in the sediments was confirmed by quantitative and chromatographic analyses, with concentrations ranging from 0 to 57.8 mg kg; Na reached values as high as 150 mg kg. The impact of the dam tailings on biota was assessed by estimating total microbial biomass (phospholipid fatty acids), which were depleted in sediments relative to soils from preserved sites. Overall plant mortality, as well as a low resilience capacity, were also observed. Ether amines and Na present in the sediments had a strong toxic effect in the environment. Identification of these substances as the main impact factors will help guide future remediation efforts.
Assuntos
Vazamento de Resíduos Químicos , Recuperação e Remediação Ambiental/métodos , Resíduos Industriais , Mineração , Brasil , Medição de Risco , Rios/química , Solo/químicaRESUMO
Herbal medicine is an ancient practice that has been gaining acceptance of the medical class through scientific studies that prove its effectiveness. However, its use should still be cautious. Medicinal plants have potential toxic effects not yet discovered, and may have unproven interactions with other medications. The use of drugs during pregnancy is still very dangerous and vigorously studied; however, there are few studies of herbal medicines in pregnant women. Existing studies prioritize on teratogenic or abortifacient effects. The aim of this study was to analyze the toxic effects of Mikania glomerata Sprengel administration, popularly known as "guaco" during the gestational period of hypertensive rats. For this experimental groups consisting of pregnant Wistar rats received treatments with guaco extract (1 to 2 mL). In order to analyze the possible toxic effects of guaco during pregnancy, weight gain of rats was assessed during pregnancy; reproductive performance of rats, morphological parameters, and fetal placental histology were compared. Although some parameters presented significant differences, we can conclude that changes prioritized by literature, such as toxicity, vasodilation and hypotension, have not been caused by guaco. The only fetal changes observed were due to the maternal hypertension. Some studies have reported vasodilator and hypotensive effects of guaco. However, only a few studies exist, and its actual effects remain unknown. Specific studies should be developed with higher doses of guaco for a definitive conclusion of its toxic and non-toxic effects.
RESUMO
Hepatitis C virus (HCV) is the main cause of chronic liver disease, cirrhosis and hepatocellular carcinoma (HCC) worldwide. The risk to develop HCC increases with the severity of liver inflammation and fibrosis. Long pentraxin 3 (PTX3) is a soluble pattern-recognition receptor produced by phagocytes and nonimmune cells at sites of inflammation or injury. The aim of the present study was to determine the association of PTX3 polymorphisms and its plasma levels with HCC occurrence among patients with HCV. Samples from 524 patients with chronic hepatitis C were evaluated in this study. Two polymorphisms (rs1840680 and rs2305619) in the PTX3 gene were determined by real-time PCR. PTX3 plasma levels were measured by Enzyme-linked Immunosorbent Assay (ELISA). Our data show a significant association between PTX3 polymorphisms and HCC occurrence in univariate and multivariate analysis (P = 0.024). Patients with HCC had higher PTX3 plasma levels compared to individuals with mild or severe fibrosis (P < 0.0001 and P = 0.002, respectively). In addition, PTX3 rs2305619 polymorphism and plasma levels were correlated with Child-Pugh scores B and C in HCC individuals. PTX3 seems to be a risk factor for HCC occurrence in chronic hepatitis C. This is the first study that evaluates PTX3 in the context of hepatitis C.
Assuntos
Proteína C-Reativa/genética , Proteína C-Reativa/metabolismo , Carcinoma Hepatocelular/sangue , Hepatite C Crônica/virologia , Neoplasias Hepáticas/sangue , Componente Amiloide P Sérico/genética , Componente Amiloide P Sérico/metabolismo , Carcinoma Hepatocelular/virologia , Ensaio de Imunoadsorção Enzimática , Feminino , Hepacivirus , Humanos , Cirrose Hepática/virologia , Neoplasias Hepáticas/virologia , Masculino , Pessoa de Meia-Idade , Polimorfismo de Nucleotídeo Único/genética , Reação em Cadeia da Polimerase em Tempo Real , Fatores de RiscoRESUMO
RESUMO O estudo objetivou selecionar na comunidade Rio Urubueua de Fátima, Abaetetuba-Pará, as espécies vegetais utilizadas no tratamento de transtornos do sistema gastrointestinal, em determinado contexto de uso, associado a um conhecimento construído localmente. A pesquisa foi realizada com 35 informantes entre 28 e 93 anos, selecionados pelo método bola de neve. Os dados foram obtidos por observação participante e entrevistas semiestruturadas. Para a importância relativa das espécies vegetais, calculou-se a porcentagem de concordância quanto aos usos principais (CUP) e concordância quanto aos usos principais corrigida (CUPc). Os interlocutores indicaram várias receitas terapêuticas, e, destas, foram escolhidas as mais empregadas no tratamento da diarreia, por ser doença recorrente na comunidade. Foi investigado o potencial químico das plantas por meio de literatura científica e bancos de dados. “Boldo” e “Anoerá” apresentaram valor máximo de CUP (100%), enquanto a “Hortelã” obteve maior CUPc (87,5%). Das 79 espécies vegetais empregadas como medicinais, nove estão na lista do SUS. Os remédios são preparados exclusivamente sob a forma de chá, sendo a folha a parte da planta mais utilizada (65%). Para o tratamento de diarreia, 12 espécies utilizadas pelos interlocutores têm compostos químicos comprovados por literatura especializada. A comunidade de Rio Urubueua de Fátima faz uso das plantas medicinais para curar doenças, apropriando-se de conhecimentos obtidos, na maioria dos relatos, de seus antepassados. Estes saberes tradicionais contribuem no conhecimento cultural da região e na pesquisa e desenvolvimento de novos fármacos.
ABSTRACT This study aimed to select the plants used to treat disorders of the gastrointestinal system, in the Rio Urubueua community of Fatima, Abaetetuba, and Pará for their particular context of use, combined with local knowledge. The survey was conducted with 35 informants between the ages of 28 and 93, selected using the snowball method.Data was obtained by participant observation, semi-structured interviews and by non-specific induction. To show the relative importance of plant species, we calculated the percentage of agreement on the main uses (CUP) and agreement with regards to the corrected main uses (cUPC).The interlocutors indicated various therapeutic recipes, and from these, those most used in the treatment of diarrhea were chosen, due to having recurrent cases of this disease in the community. The chemical potential of plants was investigated using scientific documents and databases. “Boldo” and “Anoerá” showed a maximum CUP value (100%), while the “Hortelã” obtained a higher cUPC (87.5%). Of the 79 plant species used in traditional medicine in this community, nine are used by the national healthcare service(SUS). The drugs are prepared only in the form of tea, with the leaves being the most widely used plant parts (65%).For the treatment of diarrhea, the 12 species used by the interlocutors have chemical compositions that are supported by specialized literature. The Rio Urubueua community of Fatima makes use of medicinal plants to cure diseases, from knowledge obtained, in most cases, from their ancestors. This traditional knowledge contributes to the cultural knowledge of the region and to the research and development of new drugs.
Assuntos
Humanos , Plantas Medicinais/classificação , Etnobotânica/métodos , Gastroenteropatias/classificação , Medicina TradicionalRESUMO
In order to evaluate the hydraulic performance of stormwater infiltration trenches, a study was undertaken to assess clogging and its distribution between the bottom and the sides. The method used was based on the calibration of the hydraulic resistance event by event according to Bouwer's model and applied to a demonstration trench in Belo-Horizonte monitored in the framework of the European Project Switch. The calibration was performed by minimizing the distance between measured and modeled infiltration flow rates and by using continuous measurements of rainfall, inflow, water temperature and depth in the trench. The study showed that the methodology and particularly Bouwer's model was able to produce satisfactory results. It revealed a significant clogging evolution within a year, with global resistance increasing by a factor of 9. A significant difference between the bottom and the sides was observed; the bottom being more rapidly prone to clogging. Sudden fluctuations of the hydraulic resistance of the bottom were found that could be explained by very high concentrations of total suspended solids from inflows (about 2,000 mg/L). Clogging of the sides evolves over the time but with a very low rate.
Assuntos
Drenagem Sanitária , Hidrologia/métodos , Modelos TeóricosRESUMO
Gestational diabetes mellitus (GDM) is defined as glucose intolerance first diagnosed during the second or third trimester of pregnancy. The treatment aims at glycemic control through changes in the patient's diet with or without exercise, but some patients need insulin therapy. An alternative would be to use oral hypoglycemic agents such as glibenclamide (GLIB). The present study aims to analyze the toxic effects of GLIB in fetuses of pregnant rats which received 5 or 20mg/kg doses of GLIB. Glycemic dosage reveals no significant difference between control (deionized water) and treated groups, showing that these concentrations of GLIB were not effective to cause hypoglycemia in rats. The vitality of the fetuses in all groups was 100%. GLIB administration promoted increase in weight and significant changes in measures of external morphological parameters of treated fetuses. Histological analysis revealed that liver lobes, lobules and central lobular veins were well defined for all treatments. However, GLIB animals presented a light brownish precipitate into the center-lobular veins and in the liver parenchyma among the hepatocytes. These results indicated a possible passage of the drug through the blood-placental membrane, without serious changes that impair the development of neither bone tissue, nor the liver of these animals.
RESUMO
Hepatitis C virus (HCV) is the main cause of chronic liver disease, cirrhosis and hepatocellular carcinoma (HCC) worldwide. The risk for the development of HCC increases with the severity of liver inflammation and fibrosis. The hepatic inflammation caused by HCV involves host regulatory immune response, which is mediated by cytokines with anti-viral role upon the interaction of viral polypeptides with innate and adaptive immunity. Two cytokines; tumor necrosis factor-α (TNF-α) and interleukin-10 (IL-10) play key roles in the regulation of cellular immune response in HCV infection. The aim of the present study was to determine the levels of IL-10 and TNF-α, as well as the ratio of TNF-α and IL-10 serum levels in patients with HCV and HCC caused by HCV (HCC-HCV). The study included 173 patients with chronic HCV. TNF-α and IL-10 serum levels were measured by ELISA (R&D Systems, Inc.). In the present study, 54 patients presented liver mild fibrosis, 68 had severe fibrosis and 51 patients had HCC. After adjustment in the multivariate regression analysis, the following variables remained significantly associated with HCC-HCV occurrence: diabetes (p=0.012 OR 10.44 CI 1.66-65.60), IL-10 lower levels (p<0.0001 OR 0.83 CI 0.78-0.89) and TNF-α higher levels (p<0.0001 OR 1.19 CI 1.11-1.28). Individuals with HCC presented higher TNF-α/IL-10 ratio than those with fibrosis grade F4, F3 or F0+F1+F2 (p=0.0003, p<0.0001, p<0.0001, respectively). Patients with HCC were associated to higher index TNF-α/IL-10 ratio, suggesting that the unbalanced production of these cytokines may represent progression to the liver disease severity in HCV infected patients.
Assuntos
Carcinoma Hepatocelular/sangue , Carcinoma Hepatocelular/complicações , Hepatite C Crônica/sangue , Hepatite C Crônica/complicações , Interleucina-10/sangue , Neoplasias Hepáticas/sangue , Fator de Necrose Tumoral alfa/sangue , Carcinoma Hepatocelular/genética , Feminino , Hepatite C Crônica/genética , Humanos , Cirrose Hepática/sangue , Cirrose Hepática/genética , Neoplasias Hepáticas/complicações , Neoplasias Hepáticas/genética , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Fatores de RiscoRESUMO
A chitosan-modified carbon fiber electrode (CFE) for dengue virus envelope protein (DENV) was developed. Antibodies against DENV were covalently immobilized on the chitosan (CHIT) matrix after activation with sodium periodate. Cyclic voltammetries and scanning electron microscopies analysis were performed to monitor steps involved in the CFE surface modification. Amperometric response of the competitive immunoassays was generated by hydrogen peroxide reaction with the peroxidase conjugated to DENV and 2'-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) as mediator. The immunosensor showed a lower limit of detection for DENV (0.94 ng mL(-1)) than previously described and a linear range from 1.0 to 175 ng mL(-1), in concentration levels clinically relevant for dengue virus diagnosis. The intra- and inter-assay were respectively 5.8% and 3.6%. The unique and simple design of this immunoassay format provides an economical alternative for the manufacture of other sensitive sensors.
Assuntos
Vírus da Dengue/isolamento & purificação , Eletrodos/normas , Proteínas do Envelope Viral/análise , Carbono , Fibra de Carbono , Quitosana , Dengue/diagnóstico , Vírus da Dengue/imunologia , Imunoensaio/métodos , Imunoensaio/normas , Proteínas do Envelope Viral/imunologiaRESUMO
Bmaj-9, a basic PLA2 (13679.33 Da), was isolated from Bothrops marajoensis snake venom through only one chromatographic step in reversed phase HPLC on »-Bondapak C-18 column. The amino acid composition showed that Bmaj-9 had a high content of Lys, His, and Arg, typical of a basic PLA2. The sequence of Bmaj-9 contains 124 amino acid residues with a pI value of 8.55, such as DLWQWGQMIL KETGKLPFSY YTAYGCYCGW GGRGGKPKAD TDRCCFVHDC, revealing a high homology with Asp49 PLA2 from other snake venoms. It also exhibited a pronounced phospholipase A2 activity when compared with crude venom. In chick biventer cervicis preparations, the time for 50 percent and 100 percent neuromuscular paralysis was respectively (in minutes): 110 ± 10 (1 µg/mL); 40 ± 6 and 90 ± 2 (5 µg/mL); 30 ± 3 and 70 ± 5 (10 µg/mL); 42 ± 1 and 60 ± 2 (20 µg/mL), with no effect on the contractures elicited by either exogenous ACh (110 µM) or KCl (20 mM). Bmaj-9 (10 µg/mL) neither interfered with the muscular response to direct electrical stimulation in curarized preparations nor significantly altered the release of CK at 0, 15, 30 and 60 minutes incubations (27.4 ± 5, 74.2 ± 8, 161.0 ± 21 and 353.0 ± 47, respectively). The histological analysis showed that, even causing blockade at the maximum dosage (5 µg/mL), the toxin does not induce significant morphological alterations such as necrosis or infiltration of inflammatory cells. These results identified Bmaj-9 as a new member of the basic Asp49 PLA2 family able to interact with the motor nerve terminal membrane, thereby inducing a presynaptic neuromuscular blockade.
Assuntos
Animais , Quitosana , Nanopartículas , Venenos de EscorpiãoRESUMO
Bmaj-9, a basic PLA2 (13679.33 Da), was isolated from Bothrops marajoensis snake venom through only one chromatographic step in reversed phase HPLC on »-Bondapak C-18 column. The amino acid composition showed that Bmaj-9 had a high content of Lys, His, and Arg, typical of a basic PLA2. The sequence of Bmaj-9 contains 124 amino acid residues with a pI value of 8.55, such as DLWQWGQMIL KETGKLPFSY YTAYGCYCGW GGRGGKPKAD TDRCCFVHDC, revealing a high homology with Asp49 PLA2 from other snake venoms. It also exhibited a pronounced phospholipase A2 activity when compared with crude venom. In chick biventer cervicis preparations, the time for 50 percent and 100 percent neuromuscular paralysis was respectively (in minutes): 110 ± 10 (1 µg/mL); 40 ± 6 and 90 ± 2 (5 µg/mL); 30 ± 3 and 70 ± 5 (10 µg/mL); 42 ± 1 and 60 ± 2 (20 µg/mL), with no effect on the contractures elicited by either exogenous ACh (110 µM) or KCl (20 mM). Bmaj-9 (10 µg/mL) neither interfered with the muscular response to direct electrical stimulation in curarized preparations nor significantly altered the release of CK at 0, 15, 30 and 60 minutes incubations (27.4 ± 5, 74.2 ± 8, 161.0 ± 21 and 353.0 ± 47, respectively). The histological analysis showed that, even causing blockade at the maximum dosage (5 µg/mL), the toxin does not induce significant morphological alterations such as necrosis or infiltration of inflammatory cells. These results identified Bmaj-9 as a new member of the basic Asp49 PLA2 family able to interact with the motor nerve terminal membrane, thereby inducing a presynaptic neuromuscular blockade.(AU)
Assuntos
Animais , Venenos de Serpentes/isolamento & purificação , Venenos de Serpentes/farmacologia , Análise de Sequência de Proteína/métodos , Análise de Sequência de Proteína/veterinária , Cromatografia de Fase Reversa/métodos , Cromatografia de Fase Reversa/veterinária , Receptores Pré-Sinápticos/antagonistas & inibidoresRESUMO
Nowadays, stormwater infiltration systems are frequently used because of their ability to reduce flows and volumes in downstream sewers, decrease overflows in surface waters and make it possible to recharge groundwater. Moreover, they come in various forms with different uses. Despite these advantages the long term sustainability of these systems is questionable and their real performances have to be assessed taking into account various and sometimes conflicting aspects. To address this problem a decision support system is proposed. It is based on a multicriteria method built to help managers to evaluate the performance of an existing infiltration system at different stages of its lifespan and identify whether it performs correctly or not, according to environmental, socio-economic, technical and sanitary aspects. The paper presents successively: the performance indicators and the way they were built, the multicriteria method to identify if the system works properly and a case study.
Assuntos
Conservação dos Recursos Naturais , Técnicas de Apoio para a Decisão , Drenagem Sanitária/normas , Filtração/normas , Inundações , Modelos Teóricos , Drenagem Sanitária/economia , Drenagem Sanitária/métodos , Filtração/economia , Filtração/métodos , França , Fatores de Tempo , Urbanização , Movimentos da ÁguaRESUMO
A modified version of the intruder-resident paradigm was used to investigate if social recognition memory lasts at least 24 h. One hundred and forty-six adult male Wistar rats were used. Independent groups of rats were exposed to an intruder for 0.083, 0.5, 2, 24, or 168 h and tested 24 h after the first encounter with the familiar or a different conspecific. Factor analysis was employed to identify associations between behaviors and treatments. Resident rats exhibited a 24-h social recognition memory, as indicated by a 3- to 5-fold decrease in social behaviors in the second encounter with the same conspecific compared to those observed for a different conspecific, when the duration of the first encounter was 2 h or longer. It was possible to distinguish between two different categories of social behaviors and their expression depended on the duration of the first encounter. Sniffing the anogenital area (49.9 percent of the social behaviors), sniffing the body (17.9 percent), sniffing the head (3 percent), and following the conspecific (3.1 percent), exhibited mostly by resident rats, characterized social investigation and revealed long-term social recognition memory. However, dominance (23.8 percent) and mild aggression (2.3 percent), exhibited by both resident and intruders, characterized social agonistic behaviors and were not affected by memory. Differently, sniffing the environment (76.8 percent of the non-social behaviors) and rearing (14.3 percent), both exhibited mostly by adult intruder rats, characterized non-social behaviors. Together, these results show that social recognition memory in rats may last at least 24 h after a 2-h or longer exposure to the conspecific.
Assuntos
Animais , Masculino , Ratos , Comportamento Agonístico/fisiologia , Reconhecimento Psicológico/fisiologia , Comportamento Social , Análise de Variância , Análise de Componente Principal , Ratos WistarRESUMO
A modified version of the intruder-resident paradigm was used to investigate if social recognition memory lasts at least 24 h. One hundred and forty-six adult male Wistar rats were used. Independent groups of rats were exposed to an intruder for 0.083, 0.5, 2, 24, or 168 h and tested 24 h after the first encounter with the familiar or a different conspecific. Factor analysis was employed to identify associations between behaviors and treatments. Resident rats exhibited a 24-h social recognition memory, as indicated by a 3- to 5-fold decrease in social behaviors in the second encounter with the same conspecific compared to those observed for a different conspecific, when the duration of the first encounter was 2 h or longer. It was possible to distinguish between two different categories of social behaviors and their expression depended on the duration of the first encounter. Sniffing the anogenital area (49.9% of the social behaviors), sniffing the body (17.9%), sniffing the head (3%), and following the conspecific (3.1%), exhibited mostly by resident rats, characterized social investigation and revealed long-term social recognition memory. However, dominance (23.8%) and mild aggression (2.3%), exhibited by both resident and intruders, characterized social agonistic behaviors and were not affected by memory. Differently, sniffing the environment (76.8% of the non-social behaviors) and rearing (14.3%), both exhibited mostly by adult intruder rats, characterized non-social behaviors. Together, these results show that social recognition memory in rats may last at least 24 h after a 2-h or longer exposure to the conspecific.
Assuntos
Comportamento Agonístico/fisiologia , Reconhecimento Psicológico/fisiologia , Comportamento Social , Análise de Variância , Animais , Masculino , Análise de Componente Principal , Ratos , Ratos WistarRESUMO
Vasoocclusive crisis (VOC) is the major cause of morbidity and mortality in sickle cell anemia (SCA), which is caused by the occlusion of blood vessels, followed by ischemia or infarct, resulting in progressive damage to organs. However, this clinical manifestation is variable, indicating that this process could be influenced by modifier genes. The gene MBL2 which codes for mannose-binding lectin (MBL) has been associated with modifications in the progression of infectious and inflammatory vascular diseases. The aim of this study was to determine the frequency of the polymorphisms of exon 1 (alleles A/O) and promoter region -221 (alleles Y/X) of MBL2 in children with SCA and to verify their association with VOC. The determination of the polymorphism of exon 1 and the promoter region of MBL2 was performed by SYBR GREEN((R)) and Taqman((R)) system, respectively. In the patients with SCA, the frequency of the genotype related to high production of MBL was 0.46 (YA/YA) and for intermediate/low production was 0.54 (YA/XA, XA/XA, YA/YO, XA/YO, YO/YO). The frequency of the genotypes and haplotypes of MBL2 in patients with SCA did not differ from control individuals. The populations were in Hardy-Weinberg equilibrium. The patients were divided into two groups. The groups were separated by the frequency of VOC, which was defined by the total of VOC episodes divided by the age of the children at the end of this study. Since, we choose a cut point in FVOC <1 (n=48) (which we considered of mild presentation of disease) and FVOC >or=1 (n=39) (higher severity). In children with SCA, the frequency of the genotypes of MBL2 of intermediate/low expression for MBL was associated with FVOC >or=1 (p=0.0188 OR=3.15 CI=1.19-8.50). The results suggest that MBL2 polymorphism at promoter and first exon of MBL2 associated with low serum levels and structural alterations of MBL could modify the phenotype of the child with SCA related to VOC.
Assuntos
Anemia Falciforme/complicações , Lectina de Ligação a Manose/genética , Doenças Vasculares/etiologia , Alelos , Anemia Falciforme/genética , Criança , Pré-Escolar , Éxons/genética , Feminino , Predisposição Genética para Doença , Genótipo , Haplótipos/genética , Humanos , Lactente , Infarto/etiologia , Infarto/genética , Isquemia/etiologia , Isquemia/genética , Masculino , Lectina de Ligação a Manose/fisiologia , Regiões Promotoras Genéticas/genética , Índice de Gravidade de Doença , Doenças Vasculares/genéticaRESUMO
We studied the association of the mannose-binding lectin-2 (MBL2) polymorphism with anti-thyroid antibodies (ATA) in hepatitis C virus (HCV)-infected Brazilian patients (n = 162) and 124 healthy volunteers screened for ATA. Our results showed that patients with ATA had higher frequency of genotype 00 than controls. MBL may play a role as disease modifier in HCV infection.
Assuntos
Autoimunidade/genética , Hepacivirus/imunologia , Hepatite C/sangue , Lectina de Ligação a Manose/genética , Polimorfismo Genético , Glândula Tireoide/imunologia , Adolescente , Adulto , Idoso , Brasil , Estudos de Casos e Controles , Feminino , Hepatite C/genética , Humanos , Masculino , Pessoa de Meia-IdadeAssuntos
Anemia Falciforme/complicações , Isquemia/etiologia , Lectina de Ligação a Manose/genética , Polimorfismo de Nucleotídeo Único , Infecções Respiratórias/complicações , Alelos , Anemia Falciforme/sangue , Anemia Falciforme/genética , Criança , Pré-Escolar , Éxons/genética , Feminino , Frequência do Gene , Genótipo , Humanos , Lactente , Recém-Nascido , Isquemia/fisiopatologia , Masculino , Lectina de Ligação a Manose/sangue , Lectina de Ligação a Manose/deficiência , Lectina de Ligação a Manose/fisiologia , Recidiva , Infecções Respiratórias/sangueRESUMO
The clinical heterogeneity observed in leptospirosis may be associated with host factors or bacteria virulence. Human serum mannose-binding lectin (MBL) recognizes many pathogens, and low levels of this lectin are associated with susceptibility to infection. MBL is also implicated in the modulation of the inflammatory process. We determined the levels of serum MBL during leptospirosis infection. A double-antibody sandwich ELISA was used to detect the immunoreactive serum MBL. The ELISA plates were coated with monoclonal antibody to MBL and bound MBL or recombinant human MBL were detected by rabbit anti-human MBL serum. HRPO-conjugated goat anti-rabbit antibody was used for detection of the reaction. Two groups of patients seen at referral hospitals in Recife, PE, Brazil, were divided according to the year of infection, 2001 (N = 61) or 2002 (N = 57) and compared in terms of disease severity and levels of serum MBL. A group of healthy volunteers (N = 97) matched by age, gender, and ethnic background was used as control. Patients infected in 2001 had more severe outcomes than those infected in 2002, including jaundice, hemorrhage, respiratory alteration, and renal complication (P = 0.0009; chi-square test). The frequency of patients producing serum MBL >1000 ng/mL was higher in the 2001 group than in the 2002 and control groups (P < 0.01), suggesting an association of MBL level with disease severity. The involvement of MBL and genetic variation of the MBL2 gene should be further evaluated to establish the role of this lectin in the pathogenesis of leptospirosis.
Assuntos
Adolescente , Animais , Feminino , Humanos , Masculino , Coelhos , Adulto Jovem , Leptospirose/sangue , Lectina de Ligação a Manose/sangue , Anticorpos Monoclonais/sangue , Estudos de Casos e Controles , Ensaio de Imunoadsorção Enzimática/métodos , Leptospirose/complicações , Leptospirose/imunologia , Lectina de Ligação a Manose/imunologia , Índice de Gravidade de Doença , Adulto JovemRESUMO
The clinical heterogeneity observed in leptospirosis may be associated with host factors or bacteria virulence. Human serum mannose-binding lectin (MBL) recognizes many pathogens, and low levels of this lectin are associated with susceptibility to infection. MBL is also implicated in the modulation of the inflammatory process. We determined the levels of serum MBL during leptospirosis infection. A double-antibody sandwich ELISA was used to detect the immunoreactive serum MBL. The ELISA plates were coated with monoclonal antibody to MBL and bound MBL or recombinant human MBL were detected by rabbit anti-human MBL serum. HRPO-conjugated goat anti-rabbit antibody was used for detection of the reaction. Two groups of patients seen at referral hospitals in Recife, PE, Brazil, were divided according to the year of infection, 2001 (N = 61) or 2002 (N = 57) and compared in terms of disease severity and levels of serum MBL. A group of healthy volunteers (N = 97) matched by age, gender, and ethnic background was used as control. Patients infected in 2001 had more severe outcomes than those infected in 2002, including jaundice, hemorrhage, respiratory alteration, and renal complication (P = 0.0009; chi-square test). The frequency of patients producing serum MBL >1000 ng/mL was higher in the 2001 group than in the 2002 and control groups (P < 0.01), suggesting an association of MBL level with disease severity. The involvement of MBL and genetic variation of the MBL2 gene should be further evaluated to establish the role of this lectin in the pathogenesis of leptospirosis.
Assuntos
Leptospirose/sangue , Lectina de Ligação a Manose/sangue , Adolescente , Animais , Anticorpos Monoclonais/sangue , Estudos de Casos e Controles , Ensaio de Imunoadsorção Enzimática/métodos , Feminino , Humanos , Leptospirose/complicações , Leptospirose/imunologia , Masculino , Lectina de Ligação a Manose/imunologia , Coelhos , Índice de Gravidade de Doença , Adulto JovemRESUMO
The interest in experimental use of coronary arteries of swine as a stage towards their application in human hearts justifies the need for obtaining a detailed anatomical understanding of those arteries, particularly to evaluate similarities and differences. However, we did not find any citations about anatomical indicators of coronary dominance among swine in the literature. Many authors have used the crux cordis and the origin of the posterior interventricular branch as references for defining three types of pattern in human hearts: right, balanced and left dominance. We used 30 hearts fixed in 10% formalin from male and female Landrace swine aged five to six months, weighing 80 to 110 kg. The branch corresponding to the subsinuosal interventricular sulcus came from the right coronary artery (96.7%) or from both coronary arteries (3.3%). The subsinuosal interventricular branch presented at least one small branch that went beyond the crux cordis. The apical area presented predominance of the paraconal interventricular (left anterior descending) branch in 43.3%, the subsinuosal interventricular branch in 23.3% and presence of both arteries in 33.3%. The left coronary artery emitted 54.5% of the ventricular branches and the right coronary artery 46.5%. Taking the crux cordis and the subsinuosal interventricular branch as references, the arterial pattern in swine hearts is right dominance. The diversity of the apical pattern and the balance in the distribution of ventricular branches do not allow this to be used as an approach in isolation. The similarities between human and swine hearts also apply to the coronary artery pattern.