RESUMEN

Leishmaniasis is a vector-transmitted zoonosis caused by different species of the genus Leishmania, with a wide clinical spectrum. It is a public health problem aggravated by a series of limitations regarding treatment. In the search for new therapeutic alternatives, scorpion venoms are a source of multifunctional molecules that act against the natural resistance of pathogens. This work evaluated the antileishmanial potential of Brotheas amazonicus and Tityus metuendus venoms against the promastigote forms of Leishmania amazonensis e Leishmania guyanensis. The venoms of B. amazonicus and T. metuendus were evaluated for their constituents using Fourier Transform Infrared (FTIR). Growth inhibition and death of promastigotes were evaluated in the presence of diferente crude venom concentrations (100 µg/mL, 50 µg/mL, 10 µg/mL, 1 µg/mL) after one hour of incubation at 25 °C. The FTIR spectra of both venoms exhibited bands in approximate regions, revealing that both exhibit similar functional groups. Crude venom from both scorpion species showed similar or superior leishmanicidal effects to the standart drug N-methylglucamine antimoniate. At the highest concentration of 100 µg/mL, cultures of L. guyanensis treated with the venom of B. amazonicus showed the highest mortality percentages, above 28%, while T. metuendus venom showed the highest activity against L. amazonensis, with mortality above 7%. This preliminar study demonstrates that B. amazonicus and T. metuendus venoms can be important tools in the search for new drugs Against leishmaniasis. Next step involves evaluating the activity against the amastigote forms and purifying the venom proteins in order to identify the best anti-leishmania candidates.

Asunto(s)

Leishmaniasis , Ponzoñas , Animales , Humanos , Escorpiones

RESUMEN

Analyses carried out with fluorescence in situ hybridization (FISH) in C-metaphases of the Lolium-Festuca complex have shown the occurrence of spontaneous fragile sites (FSs) in 45S rDNA regions. FSs are expressed as gaps but they do not result in breaks or chromosomal fragments in these species. These gaps have high DNA condensation observed as thin chromatin fibers that connect the apparent segments of the fragile chromosome, allowing for genomic stability. Assessing the behavior of these regions in the cell cycle of Lolium and Festuca species may lead to a better understanding of the dynamics that preserve stability during cell division. Furthermore, it is interesting to track the dynamics of chromosomes bearing 45S rDNA sites in the cell cycle as well as to observe the expression of FSs with no effect of the mitotic block. We observed variation in both the number and size of 45S FISH signals from the S/G2 phases of interphase and from prophase to anaphase where gaps in 45S rDNA sites also were observed. The change in the degree of condensation of the 45S site begins in the S/G2 phase and appears to be related to the transcriptional demand. Taking into account that the number of 45S rDNA sites tends to be re-established when cells reach telophase, we suggest that the chromatin fiber goes back to the normal condensation level to the anaphase (after segregation), allowing for the approximation of chromosome segments and ensuring dynamics that favor the genomic stability of these species.

Asunto(s)

Ciclo Celular/genética , Inestabilidad Cromosómica , Sitios Frágiles del Cromosoma , Festuca/genética , Lolium/genética , ARN Ribosómico/genética

RESUMEN

Obesity is a serious disorder in almost the entire world. It is an important risk factor for a series of conditions that affect and threaten health. Currently, bariatric surgery is the most effective treatment for morbid obesity, and in addition to the resulting weight loss, it reduces morbidity in this population. There has been a significant increase in the number of obese patients operated on. Despite the success of bariatric surgery, an important group of patients still present with major postoperative complications. In order for endoscopy to effectively contribute to the diagnosis and treatment of complications deriving from obesity surgery, the gastroenterologist must be aware of the particularities involved in bariatric surgery. The present article is a review of the resulting anatomic aspects of the main surgical techniques employed, the most common postoperative symptoms, the potential complications, and the possibilities that endoscopic diagnosis and treatment offer. Endoscopy is a growing and continuously evolving method in the treatment of bariatric surgery complications. The aim of this review is to contribute to the preparation of gastroenterologists so they can offer adequate endoscopic diagnosis and treatment to this high-risk population.

Asunto(s)

Cirugía Bariátrica/métodos , Endoscopía/métodos , Gastroenterólogos , Complicaciones Posoperatorias/terapia , Humanos , Obesidad Mórbida/cirugía , Complicaciones Posoperatorias/diagnóstico por imagen

RESUMEN

The human granulocyte colony stimulating factor (hG-CSF) plays an important role in hematopoietic cell proliferation/differentiation and has been widely used as a therapeutic agent for treating neutropenias. Nartograstim is a commercial G-CSF that presents amino acid changes in specific positions when compared to the wild-type form, which potentially increase its activity and stability. The aim of this work was to develop an expression system in Escherichia coli that leads to the production of large amounts of a recombinant hG-CSF (rhG-CSF) biosimilar to Nartograstim. The nucleotide sequence of hg-csf was codon-optimized for expression in E. coli. As a result, high yields of the recombinant protein were obtained with adequate purity, structural integrity and biological activity. This protein has also been successfully used for the production of specific polyclonal antibodies in mice, which could be used in the control of the expression and purification in an industrial production process of this recombinant protein. These results will allow the planning of large-scale production of this mutant version of hG-CSF (Nartograstim), as a potential new biosimilar in the market.

Asunto(s)

Escherichia coli/metabolismo , Factor Estimulante de Colonias de Granulocitos/metabolismo , Proteínas Recombinantes/metabolismo , Escherichia coli/genética , Factor Estimulante de Colonias de Granulocitos/genética , Humanos , Proteínas Recombinantes/genética

RESUMEN

Em cafeeiros, a associação de inimigos naturais com produtos fitossanitários seletivos é uma importante estratégia no manejo de pragas. O objetivo do presente estudo foi avaliar os efeitos letais e subletais de produtos fitossanitários utilizados na cultura cafeeira sobre ovos e adultos de Cryptolaemus montrouzieriMulsant em laboratório. Os bioensaios foram realizados sob 25 ± 2º C, UR de 70 ± 10% e fotofase de 12h. Os inseticidas utilizados e suas respectivas dosagens de aplicação, em g ou mL de i.a. L-1 foram: tiametoxam (0,5), imidacloprido (0,7), óleo mineral (13,3), endossulfam (2,63) e dimetoato (0,48). A testemunha foi composta apenas por água destilada. A aplicação dos produtos foi realizada por meio de torre de Potter. Avaliaram-se a viabilidade de ovos, a sobrevivência dos espécimes e os efeitos dos compostos sobre os parâmetros reprodutivos do predador. Tiametoxam provocou prolongamento na duração do período embrionário (7,1 dias) em ovos tratados e junto com imidacloprido foram classificados como nocivos, seguidos do endossulfam e dimetoato que apresentaram toxicidade intermediária e do óleo mineral que foi seletivo. Em função da seletividade do óleo mineral, pode-se recomendá-lo visando à compatibilização com o predador C. montrouzieri em programas de manejo integrado de pragas na cultura cafeeira.

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On coffee plantations, the association between selective compounds and natural enemies composes an important tool for the pest management. The objective of this study was to evaluate some pesticides used on coffee plantations in regard to their lethal and sublethal effects on eggs and adults of Cryptolaemus montrouzieri Mulsant under laboratory conditions. The bioassays were carried out in the Laboratory of Selectivity Studies, Department of Entomology of the Universidade Federal de Lavras ­ UFLA, Brazil, under controlled conditions (climatic chamber) at 25 ± 2º C, RH of 70 ± 10% with a 12 h photophase. The pesticides and doses in g or mL of i.a. L-1 were: thiamethoxam (0.5), imidacloprid (0.7), mineral oil (13.3), endosulfan (2.63) and dimethoate (0.48). Distilled water was used as a control. The sprayings of the pesticides were accomplished using a Potter's tower. The parameters evaluated were: specimen survival after the application of the compounds, oviposition and eggs viability. Thiamethoxam, imidacloprid and endosulfan were the most harmful to the treated individuals. When sprayed on eggs, thiamethoxam increased the embryonic period length (7.1 days). Mineral oil was the only compound that did not affect the reproduction of C. montrouzieri. In function of the selectivity presented by mineral oil, it can be recommended to be used in integrated pest management on coffee plantations in association with this predator.

Asunto(s)

Plaguicidas/análisis , Escarabajos , Uso de Plaguicidas , Coffea/parasitología

RESUMEN

ABSTRACT On coffee plantations, the association between selective compounds and natural enemies composes an important tool for the pest management. The objective of this study was to evaluate some pesticides used on coffee plantations in regard to their lethal and sublethal effects on eggs and adults of Cryptolaemus montrouzieri Mulsant under laboratory conditions. The bioassays were carried out in the Laboratory of Selectivity Studies, Department of Entomology of the Universidade Federal de Lavras UFLA, Brazil, under controlled conditions (climatic chamber) at 25 ± 2º C, RH of 70 ± 10% with a 12 h photophase. The pesticides and doses in g or mL of i.a. L-1 were: thiamethoxam (0.5), imidacloprid (0.7), mineral oil (13.3), endosulfan (2.63) and dimethoate (0.48). Distilled water was used as a control. The sprayings of the pesticides were accomplished using a Potters tower. The parameters evaluated were: specimen survival after the application of the compounds, oviposition and eggs viability. Thiamethoxam, imidacloprid and endosulfan were the most harmful to the treated individuals. When sprayed on eggs, thiamethoxam increased the embryonic period length (7.1 days). Mineral oil was the only compound that did not affect the reproduction of C. montrouzieri. In function of the selectivity presented by mineral oil, it can be recommended to be used in integrated pest management on coffee plantations in association with this predator.

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RESUMO Em cafeeiros, a associação de inimigos naturais com produtos fitossanitários seletivos é uma importante estratégia no manejo de pragas. O objetivo do presente estudo foi avaliar os efeitos letais e subletais de produtos fitossanitários utilizados na cultura cafeeira sobre ovos e adultos de Cryptolaemus montrouzieriMulsant em laboratório. Os bioensaios foram realizados sob 25 ± 2º C, UR de 70 ± 10% e fotofase de 12h. Os inseticidas utilizados e suas respectivas dosagens de aplicação, em g ou mL de i.a. L-1 foram: tiametoxam (0,5), imidacloprido (0,7), óleo mineral (13,3), endossulfam (2,63) e dimetoato (0,48). A testemunha foi composta apenas por água destilada. A aplicação dos produtos foi realizada por meio de torre de Potter. Avaliaram-se a viabilidade de ovos, a sobrevivência dos espécimes e os efeitos dos compostos sobre os parâmetros reprodutivos do predador. Tiametoxam provocou prolongamento na duração do período embrionário (7,1 dias) em ovos tratados e junto com imidacloprido foram classificados como nocivos, seguidos do endossulfam e dimetoato que apresentaram toxicidade intermediária e do óleo mineral que foi seletivo. Em função da seletividade do óleo mineral, pode-se recomendá-lo visando à compatibilização com o predador C. montrouzieri em programas de manejo integrado de pragas na cultura cafeeira.

RESUMEN

Chelonia mydas is a sea turtle that feeds and nests on the Brazilian coast and a disease called fibropapillomatosis is a threat to this species. Because of this, it is extremely necessary to determine a methodology that would enable the analysis of blood leukocyte function in these sea turtles. In order to achieve this aim, blood samples were collected from C. mydas with or without fibropapillomas captured on the São Paulo north coast. Blood samples were placed in tubes containing sodium heparin and were transported under refrigeration to the laboratory in sterile RPMI 1640 cell culture medium. Leukocytes were separated by density gradient using Ficoll-PaqueTM Plus, Amershan Biociences. The following stimuli were applied in the assessment of leukocyte function: Phorbol Miristate-Acetate (PMA) for oxidative burst activity evaluation and Zymosan A (Saccharomyces cerevisiae) Bio Particles, Alexa Fluor 594 conjugate for phagocytosis evaluation. Three cell populations were identified: heterophils, monocytes and lymphocytes. Monocytes were the cells responsible for phagocytosis and oxidative burst.

Asunto(s)

Citometría de Flujo/veterinaria , Leucocitos/fisiología , Papiloma/veterinaria , Fagocitosis/fisiología , Estallido Respiratorio/fisiología , Tortugas/sangre , Animales , Citometría de Flujo/métodos , Papiloma/sangre , Papiloma/fisiopatología

RESUMEN

Chelonia mydas is a sea turtle that feeds and nests on the Brazilian coast and a disease called fibropapillomatosis is a threat to this species. Because of this, it is extremely necessary to determine a methodology that would enable the analysis of blood leukocyte function in these sea turtles. In order to achieve this aim, blood samples were collected from C. mydas with or without fibropapillomas captured on the São Paulo north coast. Blood samples were placed in tubes containing sodium heparin and were transported under refrigeration to the laboratory in sterile RPMI 1640 cell culture medium. Leukocytes were separated by density gradient using Ficoll-PaqueTM Plus, Amershan Biociences®. The following stimuli were applied in the assessment of leukocyte function: Phorbol Miristate-Acetate (PMA) for oxidative burst activity evaluation and Zymosan A (Saccharomyces cerevisiae) Bio Particles®, Alexa Fluor® 594 conjugate for phagocytosis evaluation. Three cell populations were identified: heterophils, monocytes and lymphocytes. Monocytes were the cells responsible for phagocytosis and oxidative burst.

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Chelonia mydas é uma tartaruga marinha que freqüenta o litoral brasileiro para alimentação e nidificação e uma doença denominada fibropapilomatose é uma das mais importantes ameaças à sobrevivência dessa espécie. Desta forma, a definição de uma metodologia que permita analisar a função dos leucócitos sangüíneos torna-se extremamente necessária. Foram utilizadas amostras sangüíneas de C. mydas com e sem fibropapilomas capturadas no litoral norte do estado de São Paulo. As amostras sangüíneas foram colocadas em tubos contendo heparina sódica e transportadas em meio de cultura celular RPMI 1640 estéril e sob refrigeração. Os leucócitos foram obtidos por gradiente de densidade usando Ficoll-PaqueTM Plus, Amershan Biociences®. Os estímulos aplicados foram Miristato Acetato de Phorbol (PMA) para avaliação de burst oxidativo e Zymosan A (Saccharomyces cerevisiae) Bio Particles®, Alexa Fluor® 594 conjugate para avaliação de fagocitose. Foram identificadas três populações celulares: heterófilos, monócitos e linfócitos. Os monócitos foram as células responsáveis pela fagocitose e pelo burst oxidativo.

Asunto(s)

Animales , Citometría de Flujo/veterinaria , Leucocitos/fisiología , Papiloma/veterinaria , Fagocitosis/fisiología , Estallido Respiratorio/fisiología , Tortugas/sangre , Citometría de Flujo/métodos , Papiloma/sangre , Papiloma/fisiopatología

RESUMEN

Streptococcus pyogenes causes severe invasive infections: the post-streptococcal sequelae of acute rheumatic fever (RF) and rheumatic heart disease (RHD), acute glomerulonephritis, and uncomplicated pharyngitis and pyoderma. Efforts to produce a vaccine against S. pyogenes began several decades ago, and different models have been proposed. Here, we describe the methodology used in the development of a new vaccine model, consisting of both T and B protective epitopes constructed as synthetic peptides and recombinant proteins. Two adjuvants were tested in an experimental inbred mouse model: a classical Freund's adjuvant and a new adjuvant (AFCo1) that induces mucosal immune responses and is obtained by calcium precipitation of a proteoliposome derived from the outer membrane of Neisseria meningitides B. The StreptInCor vaccine epitope co-administrated with AFCo1 adjuvant induced mucosal (IgA) and systemic (IgG) antibodies as preferential Th1-mediated immune responses. No autoimmune reactions were observed, suggesting that the vaccine epitope is safe.

Asunto(s)

Diseño de Fármacos , Vacunas Estreptocócicas/inmunología , Streptococcus pyogenes/inmunología , Secuencia de Aminoácidos , Animales , Femenino , Inmunidad Mucosa/efectos de los fármacos , Ratones , Ratones Endogámicos BALB C , Datos de Secuencia Molecular , Vacunas Estreptocócicas/administración & dosificación , Vacunas Estreptocócicas/síntesis química , Streptococcus pyogenes/efectos de los fármacos

RESUMEN

The effect of mercury and its interaction with zinc on the content of essential metals in tissues from neonate rats was investigated. Three-day-old Wistar rats were treated with saline or 27 mg kg(-1)d(-1) ZnCl2 (s.c.) for five consecutive days. From the 8th to the 12th day of life, the rats received one daily dose of saline or 5.0 mg kg(-1) HgCl2 (s.c). Twenty-four hours after the last injection liver, kidneys and blood were collected for metal quantification. The HgCl(2) exposure induced alterations on metal levels, such as increase of Fe, Hg and Zn in liver, decrease of Fe and Mg and increase of Cu and Hg contents in kidneys. The Hg exposure also increased Hg levels in the blood. The treatment with ZnCl2, administered previously to HgCl2, partially prevented the increase of Fe in the liver, and not only prevented the decrease of renal Mg but also increased it to levels higher than those found in control group. The Zn-Hg rats also presented higher renal Cu levels, and showed partially lower blood and hepatic Hg levels and higher renal Hg levels. The pre-administration of Zn caused no severe alterations in levels of essential metals (Cu, Fe, Mg and Mn). In short, Zn appears to be an alternative treatment of Hg poisoning in young animals in comparison to chelating drugs since these have low metal selectivity.

Asunto(s)

Animales Lactantes/metabolismo , Cloruros/farmacología , Elementos Químicos , Cloruro de Mercurio/toxicidad , Compuestos de Zinc/farmacología , Animales , Cloruros/metabolismo , Cobre/sangre , Cobre/metabolismo , Femenino , Indicadores y Reactivos , Hierro/metabolismo , Riñón/efectos de los fármacos , Riñón/metabolismo , Hígado/efectos de los fármacos , Hígado/metabolismo , Magnesio/sangre , Magnesio/metabolismo , Masculino , Manganeso/sangre , Manganeso/metabolismo , Cloruro de Mercurio/metabolismo , Mercurio/sangre , Mercurio/metabolismo , Ratas , Compuestos de Zinc/metabolismo

RESUMEN

The present study analyzed the effect of social stable hierarchical dominance/submissive relationships in C57BL/6 mice on behavior, innate immunity, serum corticosterone levels and host resistance to B16F10 melanoma growth. Adult mice (90 days old) kept in pairs since weaning, were analyzed for dominant/submissive ranking in three consecutive days according to the presence or absence of fighting and/or anticipatory submissive responses. Only the pairs of mice where dominant/submissive relationships were clearly stated were employed. Results showed that submissive mice presented in relation to dominants: (1) decreased time spent in the central open-field area; (2) decreased number of entries into the open arms and decreased time spent in the exploration of the open arms of the plus maze; (3) increased time spent in exploration of the plus-maze closed arms; (4) decreased number of entries and in the time spent in the exploration of the third part of the plus-maze open arms; (5) increased number of B16F10 metastasis in the lungs; (6) decreased NK cell cytotoxicity measured in vitro in the peripheral blood and spleen; (7) decreased basal but not in S. aureus induced oxidative burst in both neutrophils and monocytes and (8) similar basal serum levels of corticosterone. The present behavioral findings show that submissive mice, within a stable social hierarchy, present anxiety like-responses a fact that would make than more prone to stressful stimuli. This condition would be responsible for the decreases presently observed on basal neutrophil oxidative burst, NK cell activity and resistance to B16F10 tumor growth. Together the obtained data show that mice that present stable hierarchical relationships display neuro-immune alterations comparable to those reported in mice under a situation of chronic social stress.

Asunto(s)

Conducta Animal/fisiología , Inmunidad Innata/fisiología , Melanoma Experimental/inmunología , Predominio Social , Animales , Corticosterona/sangre , Conducta Exploratoria/fisiología , Citometría de Flujo/métodos , Células Asesinas Naturales/fisiología , Aprendizaje por Laberinto/fisiología , Melanoma Experimental/fisiopatología , Ratones , Ratones Endogámicos C57BL , Monocitos/fisiología , Trasplante de Neoplasias/métodos , Neutrófilos/fisiología

RESUMEN

A 12-week, double-blind, placebo-controlled, multicenter study evaluated the efficacy and safety of flexible-dose sildenafil citrate (Viagra) treatment (25, 50 or 100 mg) in Brazilian and Mexican men with erectile dysfunction (ED) of broad-spectrum etiology. Efficacy was assessed on the basis of responses to the 15-item International Index of Erectile Function (IIEF) questionnaire, completed at baseline and after 12 weeks of treatment. At end point, mean scores for all IIEF domains of sexual function (erectile function, orgasmic function, sexual desire, intercourse satisfaction and overall satisfaction) were significantly (P<0.0001) higher in the sildenafil group (n=109) than in the placebo group (n=105). These findings confirm the significant increases in frequency of penetration and frequency of maintained erections reported previously. Sildenafil treatment was well tolerated. The most common adverse events were headache and flushing. In conclusion, sildenafil is a well-tolerated and effective treatment for ED of broad-spectrum etiology in Latin American men.

Asunto(s)

Disfunción Eréctil/tratamiento farmacológico , Piperazinas/administración & dosificación , Vasodilatadores/administración & dosificación , Administración Oral , Adulto , Anciano , Anciano de 80 o más Años , Brasil , Relación Dosis-Respuesta a Droga , Método Doble Ciego , Humanos , Libido/efectos de los fármacos , Masculino , México , Persona de Mediana Edad , Orgasmo/efectos de los fármacos , Satisfacción del Paciente , Piperazinas/efectos adversos , Piperazinas/uso terapéutico , Purinas , Seguridad , Citrato de Sildenafil , Sulfonas , Resultado del Tratamiento , Vasodilatadores/efectos adversos , Vasodilatadores/uso terapéutico

RESUMEN

OBJECTIVE: This study was designed to evaluate the role of c-sensitive fibers in the establishment of immune-induced flavor aversion in mice. METHODS: Mice were treated neonatally with capsaicin in order to destroy c-sensitive fibers; after such treatment, adult animals, immunized or not with ovalbumin, were submitted to a two-bottle preference test, with a choice between water and a sweetened egg white solution. RESULTS: Neonatal capsaicin treatment was unsuccessful in preventing the development of immune-induced aversion to the sweetened solution containing the antigen. Nonetheless, amongst immunized mice, those which had been previously treated with capsaicin showed a significant increment in the preference for the sweetened egg white solution. Furthermore, our data showed that neonatal capsaicin treatment did not interfere with either IgG1 or IgE production. CONCLUSION: The present results suggest that c-sensitive fibers have a role in the transmission of the signals generated by this immune response to the central nervous system, thus contributing to the development of a flavor aversion in mice.

Asunto(s)

Capsaicina/farmacología , Fibras Nerviosas/inmunología , Neuroinmunomodulación/efectos de los fármacos , Neuroinmunomodulación/fisiología , Gusto/inmunología , Animales , Animales Recién Nacidos , Reacción de Prevención , Desnervación , Hipersensibilidad a los Alimentos/inmunología , Hipersensibilidad a los Alimentos/fisiopatología , Preferencias Alimentarias/fisiología , Inmunoglobulina E/inmunología , Inmunoglobulina G/inmunología , Masculino , Ratones , Ratones Endogámicos BALB C , Fibras Nerviosas/efectos de los fármacos , Ovalbúmina/inmunología , Transmisión Sináptica/inmunología

RESUMEN

It is reported a case of a female patient, 31 years old, that was attended at our hospital with an intravesical foreign body (wax candle). The object was inserted through the urethra. The clinical presentation of this kind of patients and the technical difficulties for resolution are discussed

Asunto(s)

Humanos , Femenino , Adulto , Cuerpos Extraños , Vejiga Urinaria , Cistoscopía

RESUMEN

A evoluçäo da doença causada pela inoculaçäo intraperitoneal de Mycobacterium bovis (cepa AN5) foi avaliada em hamsters (Mesocricetus auratus) tratados de segundas a sextas-feiras, com doses subcutâneas de 30 mg/kg de Triclorfon, por um período de 8 semanas consecutivas. Os critérios adotados para essa avaliaçäo foram o tempo de sobrevivência após a inoculaçäo e a quantificaçäo do agente no baço, fígado, rim e pulmäo colhidos aos 1, 15, 29 e 45 dias após a inoculaçäo. Nessas oportunidades também foram realizados exames histopatológicos. Os animais do grupo tratado com Triclorfon e do grupo controle desenvolveram tuberculose progressiva. Os resultados da quantificaçäo do agente nos órgäos examinados, e do tempo de sobrevivência após a inoculaçäo, näo mostraram qualquer influência da administraçäo do Triclorfon

Asunto(s)

Animales , Cricetinae , Infestaciones por Garrapatas , Triclorfón/uso terapéutico , Tuberculosis/epidemiología

RESUMEN

Estudou-se a resistência a agentes antimicrobianos e o perfil plasmidial de amostras de estafilococos coagulase negativos (ECN) isolados de mastite subclínica bovina. Dos 33 ECN isolados, 57 por cento foram resistentes a sulfametoxazol, 42 por cento ao trimetoprim, 33 por cento à tetraciclina, 27 por cento à lincomicina e 18 por cento à penicilina. Nenhuma amostra foi resistente a tetraciclina, 27 por cento à lincomicina e 18 por cento à penicilina. Nenhuma amostra foi resistente a amicacina, cefalotina, neocina, oxacilina e vancomicina. Detectaram-se plasmídios em 24 (72 por cento) destas amostras, variando em número de um a nove por cultura, totalizando 76 plasmídios com 48 diferentes pesos moleculares. Em algumas amostras, mediante experimentos de cura e transformaçäo, concluiu-se que o determinante genético de resistência à tetraciclina, eritomicina e cloranfenicol está localizado em plasmídios específicos

Asunto(s)

Animales , Bovinos , Coagulasa , Mastitis Bovina , Farmacorresistencia Microbiana , Staphylococcus/aislamiento & purificación

RESUMEN

Bromopride (BRO) and domperidone (DOMP) are dopamine D2 blocking agents used in gastroenterology clinics because of their anti emetic effect as well as their central and peripheral actions of increasing gastrointestinal motor activity. The rationale for these experiments was to compare BRO- and DOMP-effects on plasma, brain, and intestinal cholinesterase activity in vitro. BRO and DOMP effects on cholinesterase activity in plasma, striatum, duodenum and ileum of adult male rats were measured for drug concentrations ranging from 0.006 to 3.134 microM for BRO and from 0.006 to 125 microM for DOMP. The results demonstrate that both BRO and DOMP can inhibit cholinesterase activity in all tissues studied, with DOMP being more potent than BRO in plasma and intestinal tissues. These data suggest the existence of a cholinergic mechanism of action for these dopamine blocking agents.

Asunto(s)

Inhibidores de la Colinesterasa/farmacología , Colinesterasas/efectos de los fármacos , Domperidona/farmacología , Metoclopramida/análogos & derivados , Animales , Colinesterasas/sangre , Cuerpo Estriado/enzimología , Duodeno/enzimología , Íleon/enzimología , Masculino , Metoclopramida/farmacología , Ratas , Ratas Wistar

RESUMEN

Sabe-se que algumas diferenças sexuais no metabolismo e no comportamento estäo relacionadas com o efeito neonatal da testosterona e outras näo sofrem esse tipo de influência. O objetivo desses experimentos foi estudar o desenvolvimento das diferenças sexuais na atividade da colinesterase plasmática e de determinar se essas diferenças seriam relacionadas com a exposiçäo pós-natal à testosterona em ratos. A atividade geral no campo aberto foi também verificada como um indicador comportamental das açöes da testosterona na diferenciaçäo sexual do sistema nervoso central. Foram usados três grupos de animais: machos normais, fêmeas normais e fêmeas masculinizadas (1 mg testosterona, SC, no 2§ dia de vida pós-natal). A atividade geral no campo aberto foi medida durante três dias consecutivos logo após o desmame (21-23 dias de idade), durante o início da puberdade (30-36 dias de idade) e nos adultos (90-110 dias de idade); a atividade da colinesterase plasmática foi medida aos 22, 30-36 e 90-110 dias de idade. Como esperado, foi encontrada uma diferença sexual no campo aberto entre machos e fêmeas normais. O tratamento pós-natal com andrógeno nas fêmeas diminuiu a atividade no campo aberto na idade adulta a padröes similares àqueles observados para machos normais. Foram observadas diferenças similares logo após o desmame, mas näo aos 22 e aos 30-36 dias de idade. Em contraste, foram observadas diferenças significantes na atividade da colinesterase de animais adultos mas näo nos dias 22 e 30-33 dias de idade. Quando comparadas às fêmeas normais, as fêmeas masculinizadas näo apresentaram diferenças na atividade da colinesterase plasmática, sendo que esses dois grupos foram diferentes dos machos. Esses resultados sugerem que as diferenças sexuais na atividade da colinesterase plasmática de ratos adultos, näo säo dependentes de exposiçäo à testosterona durante o início da vida pós-natal. Além disso os resultados demonstram que sob esse estresse (desmame) as diferenças sexuais no comportamento no campo aberto podem ser observadas já aos 21-23 dias de idade

Asunto(s)

Animales , Masculino , Femenino , Ratas , Conducta Animal , Caracteres Sexuales , Colinesterasas , Testosterona

RESUMEN

Twenty young (5 months) and 20 old (20-24 months) male Wistar rats, isolated or group housed, were tested in the elevated plus-maze to evaluate memory and anxiety. Memory was quantified by transfer latency (the time it took for the rat to move from the open arm to the enclosed arm) and anxiety by percent entries into the open arms. Isolation decreased the transfer latency of old (session 1 = 119.33 +/- 0.44 s; session 3 = 49.67 +/- 12.12 s) and young (session 1 = 111.20 +/- 8.80 s; session 3 = 55.90 +/- 13.60 s) rats, but did not modify percent entries into the open arms (old-isolated = 5.56 +/- 5.56; old-group housed = 10.18 +/- 7.05; young-isolated = 35.16 +/- 8.98; young-group housed = 33.21 +/- 8.11). Conversely, aging decreased percent entries into the open arms but did not affect the transfer latency of isolated or group-housed animals. The results indicate that the plus-maze test, unlike other methods for memory evaluation, does not discriminate between young and old rats. They also suggest that age increases anxiety and that isolation increases memory levels, but that there is no interaction between age and isolation with regard to their effect on memory and anxiety in rats.

Asunto(s)

Ansiedad/psicología , Memoria , Aislamiento Social/psicología , Factores de Edad , Animales , Reacción de Fuga , Masculino , Ratas , Ratas Endogámicas

RESUMEN

Twenty young(5months)and 20 old(20-24 months) male Wistar rats, isolated or group housed, were tested in the elevated plus-maze to elevated memory and anxiety. Memory was quantified by transfer latency (the time it took for the rat move from the open arm to the enclosed arm) and anxiety by percent entries into the openarms. Isolation decreased the transfer latency of old (session 1 - 119,33 ñ 0.44s; session 3 - 49,67 ñ 12.12s) and young (session 1 -111.20 ñ 8.80s; session 3 -55.90 ñ 13.60s) rats, but did not modify percent entries into the open arms (old-isolated - 5.56 ñ 5.56; old-group housed - 10.18 ñ7.05; young isolated - 35.16 ñ 8.98; young - group housed - 33.21 ñ 8.11). Conversely, aging decreased percent entries into the open arms but did not affect the transfer latency of isolated or group-housed animals. The results indicate that the plus-maze test, unlike other methods for memory evaluation, does not discriminate between young and rats. They also suggest that age increases anxiety and that isolation increases memory levels, but that there is no interaction between age and isolation with regard to their effect on memory and anxiety in rats

Asunto(s)

Animales , Ratas , Masculino , Ansiedad/psicología , Memoria , Aislamiento Social/psicología , Factores de Edad , Análisis de Varianza , Reacción de Fuga , Ratas Wistar