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The concern regarding the harm caused by biocides to human health has been increasing over the years, making the natural products an alternative to less toxic and more efficient biocides. Therefore, this paper reports the investigation of the disinfectant potential of extracts and isolated compounds from Baccharis dracunculifolia. For this purpose, extracts of aerial parts (BD-C), tricomial wash (BD-L) and roots (BD-R) of B. dracunculifolia were obtained by maceration. The extracts were submitted to different chromatographic techniques, including high-speedy countercurrent chromatography (HSCCC) furnishing nine isolated compounds. The extracts and isolated compounds were evaluated regarding their antimicrobial activity by the broth microdilution method, according to the Clinical and Laboratory Standards Institute, and regarding their sanitizing activity according to Standard Operating Procedure No. 65·3210·007 (INCQS, 2011), developed by the National Institute for Quality Control in Health (INCQS) - Oswaldo Cruz Foundation (FIOCRUZ). In the antimicrobial evaluation the BD-C extract showed minimum inhibitory concentration (MIC) values of 200 and 100 µg/ml against Staphylococcus aureus and Tricophyton mentagrophytes, respectively. BD-L extract showed MIC value of 200 µg/ml against S. aureus. The isolated compounds caffeic acid (MBC 2·22 µmol l-1 ), ferulic acid (MBC 2·06 µmol l-1 ) and baccharin (MBC 0·27 µmol l-1 ) showed significant inhibitory activity against S. aureus. All B. dracunculifolia isolated compounds were active with exception of aromadrendin-4´-O-methyl-ether for T. mentagrophytes. Additionally, isosakuranetin was active against Salmonella choleraesuis (MIC 1·4 µmol l-1 ). Regarding the sanitizing activity, the hydroalcoholic solution containing 0·2% of B. dracunculifolia extract in 40°GL ethanol was effective in eliminating the microbial contamination on all carrier cylinders and against all microorganisms evaluated in the recommended exposure time of 10 min. Therefore, B. dracunculifolia has potential for the development of sanitizing agents to be used in hospitals, food manufactures and homes.
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Antiinfecciosos , Baccharis , Desinfectantes , Antiinfecciosos/farmacología , Baccharis/química , Desinfectantes/farmacología , Humanos , Pruebas de Sensibilidad Microbiana , Extractos Vegetales/química , Staphylococcus aureusRESUMEN
Copper molybdate nanoplates were synthesized by a sonochemical process at room temperature, which we report as a simple and cost-effective route. Structural analysis of the material by the Rietveld method of X-ray diffraction (XRD) data revealed lindgrenite Cu3(MoO4)2(OH)2 in a single-phase structure. All the vibrational modes characteristic of the space group were identified by Raman vibrational and near-infrared (NIR) spectroscopies. The profile obtained for N2 adsorption/desorption was type III hysteresis, characteristic of mesoporous materials, with a surface area of 70.77(1) m2 g-1. The micrographs of the material obtained by scanning electron microscopy showed nanoplates with nanometric sizes and an anisotropic growth aspect. The catalytic activity of lindgrenite was evaluated by esterifying oleic acid with methanol, showing high conversion rate to methyl oleate and good catalyst stability after seven recycling cycles. Above all, the best catalytic performance was reached when we optimized parameters such as oleic acid:methanol molar ratio of 1:5, 5% of catalyst dosage, and reaction time of 5 h, resulting in 98.38% of conversion at 413 K. Therefore, sonochemically synthesized lindgrenite proved to be a high potential material for biofuel production by oleic acid esterification.
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OBJECTIVE: The goal of this study was to evaluate the influence of high-intensity interval training (HIIT) on anthropometric variables in adults afflicted with overweight or obesity and to compare the effects with those of moderate-intensity continuous training. METHODS: A computer literature search was performed for HIIT intervention studies that evaluated anthropometric variables in adults afflicted with overweight or obesity. RESULTS: Of the 857 articles retrieved in the electronic search, 48 met the inclusion criteria. The analyses demonstrated that HIIT was effective in decreasing body mass (-1.45 kg [95% CI: -1.85 to -1.05 kg]), body mass index (-0.44 kg m-2 [95% CI: -0.59 to -0.30 kg m-2 ]), waist circumference (-2.3 cm [95% CI: -3.1 to -1.4 cm]), waist/hip ratio (-0.01 [95% CI: -0.02 to -0.00]), body fat percentage (-1.29% [95% CI: -1.70% to -0.87%]) and abdominal visceral fat area (-6.83 cm2 [95% CI: -11.95 to -1.71 cm2 ]). When considering equalization between the two methods (energy expenditure or workload matched), no differences were found in any measure except body mass (for which HIIT was superior). CONCLUSIONS: High-intensity interval training and moderate-intensity continuous training results were similar, particularly when equalization between the two methods was considered. Thus, HIIT can be used as a secondary method for the treatment of obesity in adults.
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Adiposidad/fisiología , Índice de Masa Corporal , Peso Corporal/fisiología , Entrenamiento de Intervalos de Alta Intensidad , Obesidad/terapia , Sobrepeso/terapia , Antropometría , Humanos , Metaanálisis en Red , Obesidad/fisiopatología , Sobrepeso/fisiopatología , Circunferencia de la Cintura/fisiología , Relación Cintura-CaderaRESUMEN
The clinical expression of systemic lupus erythematosus (SLE) is influenced by genetic and environmental factors and therefore varies between ethnicities. Information on the epidemiology of SLE in Brazil is scarce and practically limited to studies conducted in socioeconomically developed regions (South and Southeast). The objective of this study was to describe the clinical and immunological aspects and outcome of a cohort of patients with SLE treated at a university hospital in northeastern Brazil and compare patterns related to age at onset: childhood (cSLE), adult (aSLE), and late (lSLE). A random sample of 414 records (women: 93.5%) were reviewed. The mean age at SLE onset and the mean disease duration were 28.9 ± 10.9 years and 10.2 ± 6.6 years, respectively. Most patients had aSLE (n = 338; 81.6%), followed by cSLE (n = 60; 14.5%) and lSLE (n = 16; 3.9%). The female/male ratio was 6.5:1 in cSLE and 16.8:1 in aSLE; in lSLE, all patients were female (p = 0.05). During follow-up, the cSLE group presented higher rates of nephritis (70% vs. 52.9% vs. 12.5%; p = 0.0001) and leuko/lymphopenia (61.7% vs. 43.8% vs. 56.2%; p = 0.02). No significant differences were found for anti-dsDNA, anti-Sm, and antiphospholipid antibodies. Treatment with immunosuppressants was significantly more common, and higher doses of prednisone were used, in cSLE. The prevalence of cardiovascular diseases were more frequent in lSLE (p = 0.03). No significant differences were found between the three groups with regard to mean damage accrual (SDI), remission, and mortality. Although cSLE presented higher rates of nephritis and leuko/lymphopenia, more frequent use of immunosuppressants and higher prednisone doses than aSLE and lSLE, the three groups did not differ significantly with regard to damage accrual, remission, and mortality.
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Lupus Eritematoso Sistémico/inmunología , Nefritis Lúpica/inmunología , Adolescente , Adulto , Edad de Inicio , Anticuerpos Antinucleares/sangre , Anticuerpos Antifosfolípidos/sangre , Biomarcadores/sangre , Brasil/epidemiología , Niño , Preescolar , Comorbilidad , Progresión de la Enfermedad , Femenino , Glucocorticoides/uso terapéutico , Hospitales Universitarios , Humanos , Inmunosupresores/uso terapéutico , Lupus Eritematoso Sistémico/diagnóstico , Lupus Eritematoso Sistémico/tratamiento farmacológico , Lupus Eritematoso Sistémico/mortalidad , Nefritis Lúpica/diagnóstico , Nefritis Lúpica/tratamiento farmacológico , Nefritis Lúpica/mortalidad , Masculino , Persona de Mediana Edad , Prevalencia , Inducción de Remisión , Estudios Retrospectivos , Factores de Riesgo , Factores de Tiempo , Resultado del Tratamiento , Adulto JovenRESUMEN
BACKGROUND: Embryo cryopreservation has been used for the creation of genetic banks with diploid resources, and among different techniques, vitrification is considered as the most promising method. OBJECTIVE: The goal is to evaluate the major aspects of the existing vitrification techniques and to evaluate their efficacy in terms of embryo morphology. METHODS: Electronic searches in the PubMed and ScienceDirect databases were performed with the keyword combination: fish, embryo and vitrification. Pubmed retrieved 26 articles and Science Direct resulted in 464 articles. For this review, only studies that developed and tested vitrification protocols in fish embryos were included. Research regarding cryoprotectant toxicity and permeability were excluded. There were no restrictions on publication date or language. With these criteria, a total of ten articles were evaluated. RESULTS: In these articles, the major aspects to be considered for the development of new vitrification protocols are: the cryoprotectants' toxicity, the embryos' development stage, the exposure to and the permeability of the cryoprotectants, vitrification devices and vitrification-warning cycle. CONCLUSION: The survival were limited, however, the preservation of embryonic morphology after thawing indicates the possibility of preserving fish embryos via the vitrification technique.
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Criopreservación/métodos , Criopreservación/veterinaria , Crioprotectores/metabolismo , Embrión no Mamífero/fisiología , Peces/embriología , Vitrificación , Animales , Criopreservación/instrumentación , Crioprotectores/toxicidad , Embrión no Mamífero/efectos de los fármacos , Embrión no Mamífero/embriologíaRESUMEN
UNLABELLED: Probiotics are currently added to a variety of functional foods to provide health benefits to the host and are commonly used by patients with gastrointestinal complaints or diseases. The therapeutic effects of lapachol continue to inspire studies to obtain derivatives with improved bioactivity and lower unwanted effects. Therefore, the general goal of this study was to show that probiotics are able to convert lapachol and are important to assess the effects of bacterial metabolism on drug performance and toxicity. The microbial transformations of lapachol were carried out by Bifidobacterium sp. and Lactobacillus acidophilus and different metabolites were produced in mixed and isolated cultures. The cytotoxic activities against breast cancer and normal fibroblast cell lines of the isolated metabolites (4α-hydroxy-2,2-dimethyl-5-oxo-2,3,4,4α,5,9ß-hexahydroindeno[1,2-ß]pyran-9ß-carboxilic acid, a new metabolite produced by mixed culture and dehydro-α-lapachone produced by isolated cultures) were assessed and compared with those of lapachol. The new metabolite displayed a lower activity against a breast cancer cell line (IC50 = 532.7 µmol l(-1) ) than lapachol (IC50 = 72.3 µmol l(-1) ), while dehydro-α-lapachone (IC50 = 10.4 µmol l(-1) ) displayed a higher activity than lapachol. The present study is the first to demonstrate that probiotics are capable of converting lapachol into the most effective cytotoxic compound against a breast cancer cell line. SIGNIFICANCE AND IMPACT OF THE STUDY: Probiotics have been used in dairy products to promote human health and have the ability to metabolize drugs and other xenobiotics. Naphthoquinones, such as lapachol, are considered privileged scaffolds due to their high propensity to interact with biological targets. The present study is the first to demonstrate that probiotics are capable of converting lapachol into the most effective cytotoxic compound against a breast cancer cell line. The developed approach highlights the importance of probiotics to assess the effects of bacterial metabolism on drug performance and toxicity.
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Antineoplásicos/farmacología , Bifidobacterium/metabolismo , Indenos/farmacología , Lactobacillus acidophilus/metabolismo , Naftoquinonas/metabolismo , Probióticos/metabolismo , Biotransformación , Línea Celular Tumoral , Doxorrubicina/farmacología , Ensayos de Selección de Medicamentos Antitumorales , Femenino , Humanos , Concentración 50 Inhibidora , Naftoquinonas/farmacologíaRESUMEN
OBJECTIVES: To evaluate the occurrence of low bone mineral density (BMD) and its relationship with clinical and laboratorial characteristics in children and young adults with sickle cell anaemia living in Northeast-Brazil, and to assess the role of radiography in diagnosing low BMD. METHODS: Bone mineral density of lumbar spine was measured by dual energy X-ray absorptiometry (DXA) in 27 patients with Sickle cell anaemia (SCA) aged 7-28 years. Clinical history, calcium and calorie intake, laboratory measurements, anthropometrics and pubertal development were assessed, and X-rays were obtained. Z-scores and T-scores for weight, height, Body Mass Index (BMI) and BMD were calculated using age and gender matched reference data. RESULTS: Mean lumbar spine BMD Z-scores and T-scores were -1.81 SD in boys and -0.80 SD in girls. BMD Z-scores were below -2 SD in 33.3% of girls and in 46.7% of boys. Low BMD (<-2 SD) occurred significantly more in patients with low height-for-age (P = 0.02), low weight-for-age (P = 0.001) and low BMI-for-age (P = 0.006). No significant relationships were found between BMD and other clinical and laboratory parameters. Radiography had a sensitivity of 75% and a specificity of 36% to detect low BMD, and was considered not useful in this context. CONCLUSIONS: Patients with low height and/or low weight-for-age seem to be at high risk for developing low BMD.
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Anemia de Células Falciformes/fisiopatología , Densidad Ósea , Trastornos del Crecimiento/etiología , Pubertad , Adolescente , Adulto , Anemia de Células Falciformes/complicaciones , Anemia de Células Falciformes/patología , Estatura , Índice de Masa Corporal , Peso Corporal , Brasil , Niño , Femenino , Trastornos del Crecimiento/patología , Trastornos del Crecimiento/fisiopatología , Humanos , Vértebras Lumbares/patología , Masculino , Adulto JovenRESUMEN
BACKGROUND: It was already evidenced decreased heart rate variability (HRV) in chronic obstructive pulmonary disease (COPD) patients at rest. OBJECTIVE: In order to insert new elements in the literature regarding this issue, we evaluated geometric index of HRV in COPD subjects. METHOD: We analyzed data from 34 volunteers, divided into two groups according to spirometric values: COPD (17 volunteers, FEV1/FVC=47.3±10.2; FEV1=50.8±15.7) and control (17 volunteers, FEV1/FVC=78.8±10.8; FEV1=100.1±14.7). For analysis of HRV indexes the volunteers remained in the supine position for 30 minutes. We analyzed the following indexes: triangular index (RRtri), triangular interpolation of RR intervals (TINN) and Poincaré plot (SD1, SD2 and SD1/SD2). Student t test for unpaired samples and Mann-Whitney test were used for data analysis. RESULTS: We observed statistically significant reductions in geometric indexes in the COPD group: RRtri (0.043±0.01 vs. 0.059±0.02; p=0.018), TINN (105.88±51.82 vs. 151.47±49.9; p=0.014), SD1 (9.76±4.66 vs. 14.55±6.04; p=0.014) and SD2 (34.86±17.02 vs. 51.51±18.38; p=0.010). SD1/SD2 (0.30±0.11 vs. 0.28±0.07; p=0.605) were not significantly different between groups. Patients with COPD presented a visual analysis of Poincaré plot of lower dispersion of RR intervals both beat to beat and the long term. CONCLUSION: Subjects with COPD present reduction of geometric indexes of HRV, indicating reduced heart rate variability.
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Frecuencia Cardíaca/fisiología , Enfermedad Pulmonar Obstructiva Crónica/fisiopatología , Anciano , Femenino , Pruebas de Función Cardíaca/métodos , Humanos , MasculinoRESUMEN
The genetic manipulation of mosquito vectors is an alternative strategy in the fight against malaria. It was previously shown that bee venom phospholipase A2 (PLA2) inhibits ookinete invasion of the mosquito midgut although mosquito fitness was reduced. To maintain the PLA2 blocking ability without compromising mosquito biology, we mutated the protein-coding sequence to inactivate the enzyme while maintaining the protein's structure. DNA encoding the mutated PLA2 (mPLA2) was placed downstream of a mosquito midgut-specific promoter (Anopheles gambiae peritrophin protein 1 promoter, AgPer1) and this construct used to transform Aedes fluviatilis mosquitoes. Four different transgenic lines were obtained and characterized and all lines significantly inhibited Plasmodium gallinaceum oocyst development (up to 68% fewer oocysts). No fitness cost was observed when this mosquito species expressed the mPLA2.
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Aedes/enzimología , Aedes/parasitología , Insectos Vectores/parasitología , Malaria Aviar/prevención & control , Fosfolipasas A2/genética , Plasmodium gallinaceum/crecimiento & desarrollo , Aedes/genética , Animales , Animales Modificados Genéticamente , Pollos , ADN/química , ADN/genética , Femenino , Insectos Vectores/enzimología , Insectos Vectores/genética , Masculino , Ratones , Mutagénesis Sitio-Dirigida , Fosfolipasas A2/biosíntesis , Mutación Puntual , Proteínas RecombinantesRESUMEN
The newborn screening programme started in Brazil (1976) through isolated initiatives, without governmental directions and/or policies. According to Health Ministry (2000) data the coverage was 55% and unevenly distributed. Only 17 out of 27 Brazilian states had more than 30% coverage. Public budgets covered only diagnostic examinations. There were no official data about assistance, patient follow-up or detected disorders. The creation of the National Programme (2001) has provided new perspective for newborn screening (NBS) in the public health system. It has provided important official data and established management and care units for each state: Reference Services in Newborn Screening. The programme screened about 13 million newborns from October 2001 to December 2005. The coverage increased to 80.2% (2005) and 74% of the states presented coverage of over 70%. Within 34 accredited Reference Services in 27 Brazilian states, all provide screening for PKU and CH. Ten of them provide screening for haemoglobinopathies as well, and three of them provide also for CF. The Reference Services altogether count on at least 170 health professionals, such as paediatricians, endocrinologists, nutritionists, psychologists and social workers. They are qualified to assist positive cases, within the policies established by the National Programme. There has been significant increase in NBS coverage and follow-up assuredness, including detected cases before the National Programme (10,935 positive cases) mostly in those regions where the programme did not exist. There has been significant evolution in the Newborn Screening as a Public Health Program in Brazil due to the government's commitment (federal and each component state).
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Hipotiroidismo Congénito/diagnóstico , Tamizaje Neonatal/métodos , Fenilcetonurias/diagnóstico , Salud Pública/métodos , Brasil , Hipotiroidismo Congénito/sangre , Política de Salud , Humanos , Recién Nacido , Exámenes Obligatorios , Programas Nacionales de Salud , Fenilcetonurias/sangre , Atención Primaria de Salud/normasRESUMEN
In the present paper the effect of Ang-(1-7) on the distal tubule (Na(+)+K+)ATPase activity was evaluated by using MDCK cells as a model. Confluent cell monolayers were incubated with increasing concentrations of Ang-(1-7) for 30 min. Thereafter, the (Na(+)+K+)ATPase activity was evaluated and a dose-dependent (from 10(-12) to 10(-7) M) inhibition was observed. The maximal inhibitory effect (54%) was reached at the concentration of 10(-8) M. The inhibitory effect of Ang-(1-7) was not affected by the AT2 receptor selective antagonist PD123319 (from 10(-10) to 10(-7) M) but was blocked in a dose-dependent manner by the AT1 receptor selective antagonists losartan (10(-10) M), candesartan (10(-17) M), irbesartan (2 x 10(-12) M) and telmisartan (2 x 10(-16) M). The signaling pathway triggered by stimulation of the AT(1) receptor was also investigated. The PI-phospholipase C (PI-PLC) inhibitor U73122 (5 x 10(-8) M) blocked the inhibitory effect elicited by Ang-(1-7). Involvement of the protein kinase C (PKC) was evidenced by the sensitivity of the inhibitory effect of Ang-(1-7) to calphostin C (6.32 x 10(-7) M) and the lack of additive effects when the cells were co-incubated with Ang-(1-7) and 3.2 x 10(-8) M PMA. Altogether, these results demonstrate that Ang-(1-7) inhibits the (Na(+)+K+)ATPase activity of the prototypic distal tubule cell MDCK through the AT1 receptor-mediated stimulation of PI-PLC/PKC signaling pathway.
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Angiotensina I/farmacología , Antihipertensivos/farmacología , Túbulos Renales Distales/enzimología , Fragmentos de Péptidos/farmacología , Transducción de Señal/efectos de los fármacos , ATPasa Intercambiadora de Sodio-Potasio/metabolismo , Animales , Línea Celular , Perros , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/farmacología , Túbulos Renales Distales/citología , ATPasa Intercambiadora de Sodio-Potasio/antagonistas & inhibidoresRESUMEN
The authors describe clinical pathologic findings in a patient with a structural chromosome 16 anomaly in mosaic distribution with the phenotypic characteristics of the Proteus syndrome. This is the 1st report showing that the Proteus syndrome may be associated with a chromosome 16 anomaly; while previous findings suggested that this syndrome was associated with a modification of chromosome 1. As the pathologic hypothesis of this syndrome possibly involves lethal genes in somatic mosaicism, responsible for control of cellular proliferation and/or alteration in the mechanism of action of some growth factors, chromosomal alterations found in the patient described in this work may suggest the location of the genes involved in this syndrome.
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Aberraciones Cromosómicas , Cromosomas Humanos Par 16/genética , Mosaicismo , Síndrome de Proteo/genética , Niño , Humanos , Cariotipificación , Masculino , Fenotipo , Síndrome de Proteo/patologíaRESUMEN
Human rotavirus strains belonging to genotype G9 or P[9] were detected in a collection of stool specimens from children with diarrhea in two cities of the state of Rio de Janeiro, Brazil, between March 1997 and December 1999. G9 strains were first detected in April 1997 and remained prevalent until the end of the study, at a frequency of 15.9% (n = 157). A high percentage of VP7 nucleotide (99.0 to 99.5%) and deduced amino acid identity (98.6 to 99.1%) was found between three randomly selected Brazilian G9 strains and the American G9 strain US1205. A novel G9:P[4] genotype combination was detected in addition to G9:P[8] and G9:P[6], demonstrating that this G genotype may undergo constant genetic reassortment in nature. The P[9] rotavirus strains constituted 10.2%, the majority of which were detected between April and July 1997. The RNA electrophoretic migration pattern of the G3:P[9] strains resembled that of AU-1 virus (G3:P3[9]), suggesting a genetic similarity between the Brazilian G3:P[9] strains and the Japanese virus, which is similar to a feline rotavirus genetically.
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Antígenos Virales , Proteínas de la Cápside , Diarrea/virología , Infecciones por Rotavirus/virología , Rotavirus/clasificación , Rotavirus/genética , Técnicas de Tipificación Bacteriana , Brasil/epidemiología , Cápside/genética , Preescolar , Diarrea/epidemiología , Electroforesis en Gel de Poliacrilamida , Genotipo , Humanos , Datos de Secuencia Molecular , Rotavirus/aislamiento & purificación , Infecciones por Rotavirus/epidemiología , Análisis de Secuencia de ADNRESUMEN
Giardia lamblia, a primitive eukaryotic cell, lacks organelles such as mitochondria, peroxisomes, and a typical Golgi complex and presents a system of vesicles located below the plasma membrane. We used fluorescence and electron microscopy to better characterize the peripheral vesicles. Incubation of living cells with acridine orange showed that the peripheral vesicles correspond to an acidic compartment. Incubation with lucifer yellow, and with horseradish peroxidase, showed labeling of the peripheral vesicles even after several hours. Acid phosphatase was localized in the endoplasmic reticulum and in most of the peripheral vesicles. On the other hand, glucose 6-phosphatase, an endoplasmic reticulum marker, was observed in the endoplasmic reticulum cisternae and in some peripheral vesicles. A similar labeling pattern was observed using the zinc iodide technique, which reveals SH-containing proteins. Three-dimensional reconstruction and electron microscopy tomography of cells stained for acid phosphatase and glucose-6-phosphatase revealed the connection between some vesicles and profiles of the endoplasmic reticulum. Taken together, our observations suggest that trophozoites of G. lamblia present an endosomal-lysosomal system concentrated in a single system, the peripheral vesicles, which may represent an ancient organellar system that later on subdivided into compartments such as early and late endosomes and lysosomes.
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Endosomas/ultraestructura , Giardia lamblia/ultraestructura , Lisosomas/ultraestructura , Fosfatasa Ácida/metabolismo , Naranja de Acridina/metabolismo , Animales , Biomarcadores/análisis , Retículo Endoplásmico/ultraestructura , Endosomas/enzimología , Histocitoquímica , Peroxidasa de Rábano Silvestre/metabolismo , Isoquinolinas/metabolismo , Lisosomas/enzimología , Microscopía Electrónica , Microscopía Fluorescente , TomografíaRESUMEN
In this communication we review the results obtained with the confocal laser scanning microscope to characterize the interaction of epimastigote and trypomastigote forms of Trypanosoma cruzi and tachyzoites of Toxoplasma gondii with host cells. Early events of the interaction process were studied by the simultaneous localization of sites of protein phosphorylation, revealed by immunocytochemistry, and sites of actin assembly, revealed by the use of labeled phaloidin. The results obtained show that proteins localized in the interaction sites are phosphorylated. The process of formation of the parasitophorous vacuole was monitored by labeling the host cell surface with fluorescent probes for lipids (PKH26), proteins (DTAF) and sialic acid (FITC-thiosemicarbazide) before interaction with the parasites. Evidence was obtained indicating transfer of components of the host cell surface to the parasite surface in the beginning of the interaction process. We also analyzed the distribution of cytoskeletal structures (microtubules and microfilaments visualized with specific antibodies), mitochondria (visualized with rhodamine 123), the Golgi complex (visualized with C6-NBD-ceramide) and the endoplasmic reticulum (visualized with anti-reticulin antibodies and DIOC6) during the evolution of intracellular parasitism. The results obtained show that some, but not all, structures change their position during evolution of the intracellular parasitism.
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Interacciones Huésped-Parásitos , Ratones/parasitología , Toxoplasma/fisiología , Trypanosoma cruzi/fisiología , Animales , Chlorocebus aethiops , Macrófagos Peritoneales , Microscopía Confocal , Células VeroRESUMEN
AIM: To determine by morphometry if pleural biopsies with the histopathological diagnosis of "non-specific pleuritis", malignant, and tuberculous disease could be distinguished morphologically from those with truly non-specific disease. METHODS: Each pleural biopsy was reviewed taking into account three compartments of reference: the visceral/parietal mesothelial compartment, the submesothelial screen compartment, and the submesothelial adipose tissue compartment. Normal connective tissue, granulation tissue, fibrocellular proliferation, fibrin, polymorphonuclear cells, mononuclear cells, and mesothelial cells were measured using conventional point counting procedures in terms of the fractional area occupied by each parameter within each compartment of reference. Ranking was carried out on 164 patients, based on their diagnosis: chronic non-specific disease (n = 57), tuberculosis (n = 27), malignant disease (n = 58), and conditions associated with transudative effusions (n = 22). RESULTS: Stepwise discriminant analysis of the resulting data showed that biopsies from patients with tuberculosis, malignant disease, and chronic non-specific disease could be distinguished between themselves and normal cases. Statistical differences among the four groups were observed for eight morphometric parameters related to components of inflammation and extension throughout the three pleural anatomical compartments. A robust discriminant function permitted an adequate classification of the three groups of disease in 88.41% of the cases. Pleural biopsies with fibrin incorporated within granulation tissue on the submesothelial screen compartment showed 100% specificity for patients with tuberculosis, while mononuclear cells in a band-like infiltrate on the submesothelial adipose tissue compartment showed 93.1% specificity for patients with malignant disease. The truly non-specific pleuritis was characterised by deposits of fibrin in the subpleural compartment and discrete signs of chronic inflammation and reparatory fibrosis on the submesothelial screen. CONCLUSIONS: Morphometric analysis of pleural biopsies may be a useful supplementary histological procedure to support the diagnosis of pleural tuberculosis and malignant disease.
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Síndromes Paraneoplásicos/patología , Pleura/patología , Pleuresia/patología , Tuberculosis Pleural/patología , Biopsia con Aguja , División Celular , Enfermedad Crónica , Diagnóstico Diferencial , Estudios de Seguimiento , Humanos , Derrame Pleural/patologíaRESUMEN
The interaction of Trypanosoma cruzi with different vertebrate cells involves two distinct steps, attachment and internalization. Genistein and staurosporine, drugs which inhibit protein kinases, specially tyrosine kinase, are able to block the infection of macrophages by T. cruzi, suggesting that protein phosphorylation is a key event on this process.