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1.
Córdoba; s.n; 2014. [39], 157 p. ilus.
Tese em Espanhol | LILACS | ID: lil-750203

RESUMO

Las mitocondrias son una de las organelas más importantes del miocardiocito, ya que aportan el 90% de la energía utilizada por el miocardio y la fibra muscular. La infección por T. cruzi induce la producción de mediadores proinflamatorios e inflamatorios que juegan un rol importante en modular la resistencia del parásito; estos mediadores producen aumento del estrés oxidativo generando toxicidad para los componentes celulares y para la misma organela, esto está asociado con una actividad modificada de los complejos respiratorios, lo que hace indispensable identificar marcadores de inicio y de evolución de lesiones en miocardio y en el tejido muscular, como así también en sangre, que nos permitiría con una simple muestra conocer el estado mitocondrial y predecir la evolución de la miocardiopatía, para prevenir la instalación o disminuír la gravedad de la enfermedad. Es por ello que en el presente trabajo hemos reproducido en modelos experimentales el inicio de la infección por T. cruzi y la evolución de la enfermedad en miocardio, músculo esquelético y sangre para comprobar si existen alteraciones a nivel histopatológico y ultraestructural de las mitocondrias, lo que implicaría una menor producción de energía y como consecuencia una disminución en la capacidad contráctil. Se analizaron los efectos de la infección de ratones con dos aislamientos (SGO Z12 y Lucky) y una cepa (Tulahuen) de T.cruzi. El estudio se llevó a cabo en los estadios agudo (35 días post-infección), crónico indeterminado (75 días post-infección) y crónico cardiaco (365 días post-infección) de la infección, analizando la histopatología de los tejidos, la ultraestructura mitocondrial y su función a través de la actividad enzimática de la citrato sintasa (enzima del ciclo de Krebs) y de los complejos (I-IV) de la cadena respiratoria...


Mitochondria are important organelles for myocardiocyte as provide 90% of the energy used by the myocardium and muscle fiber. T. cruzi infection induces the production of proinflammatory and inflammatory mediators that play an important role in modulating parasite resistance; these mediators cause increased oxidative stress causing cellular toxicity for the same components and organelles, this is associated with a modified activity of the respiratory complexes, which is essential to identify markers of evolution starting and myocardial injury and tissue muscle, as well as in blood, which would allow us to know a single sample mitochondrial state and predict the evolution of cardiomyopathy, to prevent installation or diminish the severity of the disease. That is why in this paper we have reproduced in experimental models starting T. cruzi infection and disease progression in myocardium, skeletal muscle and blood to check for histopathological and ultrastructural alterations of mitochondria level, would imply a lower energy output and consequently a decrease in contractility. The effects of infection of mice with two isolates (SGO Z12 and Lucky) and a strain (Tulahuen) of T. cruzi were analyzed. The study was carried out in the acute stage (35 days post-infection), indeterminate chronic (75 days post-infection) and chronic cardiac (365 days post-infection) of infection, analyzing tissue histopathology, ultrastructure mitochondrial and function through the enzymatic activity of citrate synthase (Krebs cycle) and the complexes (I-IV) of the respiratory chain...


Assuntos
Humanos , Doença de Chagas , Evolução Clínica , Cardiomiopatia Chagásica/fisiopatologia , Biomarcadores/análise , Argentina
2.
Parasitol Int ; 62(3): 293-9, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23500720

RESUMO

Alternative strategies are being designed to identify candidates among drugs already available on the market that could be used in combination to improve the efficacy of Chagas disease treatment. This work evaluates the effect of the association of clomipramine (CLO) with benznidazole (BZN) for the treatment of experimental Chagas disease in the acute stage, in Swiss albino mice infected with Trypanosoma cruzi Tulahuen strain. Infected mice were treated with CLO 5mg/kg/day and BZN 50 and 100mg/kg/day, each separately or together. Efficacy of the treatment was evaluated through parasitemia, survival, electrocardiography, histopathological studies, serological and PCR assays at 90 days post-infection (dpi). All treatments significantly (P<0.05) reduced mortality and decreased parasitemia. Histopathological analysis of liver and kidneys of mice treated with CLO and the drug combination showed less injury than mice treated only with BZN. The lower dose of BZN (50mg/kg/day) combined with CLO showed the same efficacy as the habitual dose of BZN (100mg/kg/day) combined with CLO. The therapeutic results from the combination of BZN with CLO presented lesser side effects than the treatment with BZN.


Assuntos
Doença de Chagas/tratamento farmacológico , Clomipramina/uso terapêutico , Nitroimidazóis/uso terapêutico , Tripanossomicidas/uso terapêutico , Trypanosoma cruzi/efeitos dos fármacos , Animais , Doença de Chagas/patologia , Clomipramina/farmacologia , Modelos Animais de Doenças , Avaliação Pré-Clínica de Medicamentos , Eletrocardiografia , Feminino , Intestinos/patologia , Rim/patologia , Fígado/patologia , Masculino , Camundongos , Músculo Esquelético/patologia , Miocárdio/patologia , Nitroimidazóis/farmacologia , Parasitemia , Tripanossomicidas/farmacologia
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