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1.
J Nutr Biochem ; 96: 108806, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34147603

RESUMO

Many cancer patients receive their classical therapies together with vitamin supplements. However, the effectiveness of these strategies is on debate. Here we aimed to evaluate how vitamin E supplementation affects the anticancer effects of interferon (IFN-α) using an early-model of liver cancer development (initiation-promotion, IP). Male Wistar rats subjected to this model were divided as follows: untreated (IP), IP treated with recombinant IFN-α-2b (6.5  ×  105 U/kg), IP treated with vitamin E (50 mg/kg), and IP treated with combination of vitamin E and IFN-α-2b. After treatments rats were fasted and euthanized and plasma and livers were collected. Combined administration of vitamin E and IFN-α-2b induced body weight drop, increased liver apoptosis, and low levels of hepatic lipids. Interestingly, vitamin E and IFN-α-2b combination also induced an increase in altered hepatic foci number, but not in size. It seems that vitamin E acts on its antioxidant capability in order to block the oxidative stress induced by IFN-α-2b, blocking in turn its beneficial effects on preneoplastic livers, leading to harmful final effects. In conclusion, this study shows that vitamin E supplementation in IFN-α-2b-treated rats exerts unwanted effects; and highlights that in spite of being natural, nutritional supplements may not always exert beneficial outcomes when used as complementary therapy for the treatment of cancer.


Assuntos
Anticarcinógenos/farmacologia , Interferon alfa-2/farmacologia , Neoplasias Hepáticas/prevenção & controle , Vitamina E/farmacologia , Vitaminas/farmacologia , Animais , Carcinogênese/efeitos dos fármacos , Carcinogênese/patologia , Interações Medicamentosas , Fígado/efeitos dos fármacos , Fígado/patologia , Neoplasias Hepáticas/patologia , Masculino , Ratos Wistar
4.
Toxicol Appl Pharmacol ; 379: 114650, 2019 09 15.
Artigo em Inglês | MEDLINE | ID: mdl-31299271

RESUMO

IFN-α is used for inflammatory purposes, and obesity and NAFLD are strongly correlated with inflammatory processes. We wondered whether IFN-α-2b can attenuate obesity development and its associated NAFLD in mice fed high fat diet (HFD) for 10 weeks. IFN-α-2b had a robust effect on body weight loss associated with NAFLD amelioration by decreasing hepatic inflammation. IFN-α-2b-treated mice showed increased plasma cholesterol levels together with decreased hepatic cholesterol, both on chow and HF diets. Interestingly, mice on IFN-α-2b treatment secreted smaller VLDL particles highly enriched in cholesterol. Mechanistically, we found that IFN-α-2b antiobesity effects were related to increased fatty acid oxidation; and its effects on cholesterol metabolism were due to both a decrease in the master cholesterogenic transcription factor SREBP-2 and in the rate limiting enzyme in cholesterol synthesis, HMGCR. To our knowledge, this is the first report showing the effects of IFN-α-2b on the prevention of the development of HFD-induced body weight gain and dyslipidemia through a mechanism that involves fatty acid oxidation and cholesterol decrease. These studies comprise necessary steps for understanding the amelioration of obesity and NAFLD. Results shed some light into the mechanism of action of natural cytokines, and their effects on ameliorating obesity and its related diseases.


Assuntos
Interferon alfa-2/uso terapêutico , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Obesidade/prevenção & controle , Tecido Adiposo/efeitos dos fármacos , Tecido Adiposo/metabolismo , Animais , Dislipidemias/tratamento farmacológico , Ácidos Graxos/metabolismo , Lipídeos/sangue , Lipoproteínas/sangue , Lipoproteínas VLDL/sangue , Fígado/patologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Hepatopatia Gordurosa não Alcoólica/patologia , Hipernutrição/complicações , Reação em Cadeia da Polimerase em Tempo Real
5.
Nutrition ; 59: 170-179, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30496957

RESUMO

OBJECTIVE: Vitamin K2, which is present in dairy products and has been recommended as a micronutrient supplement in humans, contains anticancer properties. Interferon (IFN)-α-2b administered during development of hepatic preneoplasia decreased both number and volume percentage of altered hepatic foci (AHF) by increasing apoptosis in the foci. The aim of this study was to evaluate the effects of IFN-α-2b treatment supplemented with vitamin K2 in the early stages of liver cancer development in rats. METHODS: Adult male Wistar rats were subjected to a two-phase model of hepatocarcinogenesis (initiated-promoted [IP] group). Animals were divided into four groups: untreated (IP), IP treated with IFN-α-2b (6.5 × 105 U/kg), IP treated with vitamin K2 (10 mg/kg), and IP treated with both compounds. RESULTS: The study results demonstrated that vitamin K2 blocked IFN-α-2b-induced reduction in size and volume of the altered hepatic foci and inhibited IFN-α-2b-induced apoptosis. Its inhibition of IFN-α-2b-induced apoptosis was mediated by increased levels of total hepatic Bcl-2 in rat preneoplastic livers. CONCLUSION: These findings demonstrate that supportive vitamin supplements or therapies are not always safe because they could put the life of patients treated with IFN-α-2b at risk.


Assuntos
Antineoplásicos/administração & dosagem , Carcinogênese/efeitos dos fármacos , Suplementos Nutricionais , Interferon alfa-2/administração & dosagem , Vitamina K 2/administração & dosagem , Vitaminas/administração & dosagem , Animais , Apoptose/efeitos dos fármacos , Fígado/efeitos dos fármacos , Neoplasias Hepáticas/tratamento farmacológico , Masculino , Lesões Pré-Cancerosas/tratamento farmacológico , Ratos , Ratos Wistar
6.
Biochim Biophys Acta ; 1862(11): 2043-2053, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-27523631

RESUMO

It is accepted that cancer development is associated with metabolic changes. Previously, we established a model of hepatic preneoplasia in which adult rats were subjected to a 2-phase model of hepatocarcinogenesis (initiated-promoted, IP) for 6weeks until they develop altered hepatic foci (AHF). Here, we found that a whole metabolic shift occurs in order to favor cancer development. IP animals presented with increased plasma lipids due to increased VLDL secretion as well as increased liver lipid accretion due to stimulated transacetylase activity rather than lipogenesis, compared to control rats. We found that carboxylesterase 3/triacylglycerol hydrolase (Ces3/Tgh) presented with a perilobular distribution surrounding lipid droplets in normal livers. However, it is downregulated both at the protein and mRNA level in liver homogenates and is almost undetectable inside the AHF with no changes in the surrounding tissue. Ces3/Tgh expression is regulated by ω-3 fatty acids, thus, supplementation of diet with fish oil, allowed the restoration of Ces3/Tgh expression inside the foci and, more interestingly, led to the decrease in number and volume of the AHF. These studies show a preventive role of Ces3/Tgh in liver cancer development.

7.
Rev Salud Caribe ; 2: 24-30, 2014. tab, graf
Artigo em Espanhol | CUMED | ID: cum-60502

RESUMO

La familia Herpesviridae contiene varios de los patógenos humanos más importantes, que tienen la habilidad de establecer infecciones persistentes en sus huéspedes(AU)


Assuntos
Humanos , Biomarcadores , Reação em Cadeia da Polimerase , Infecções por Herpesviridae/imunologia
8.
Rev Salud Caribe ; 2: 14-23, 2014. graf
Artigo em Espanhol | CUMED | ID: cum-60501

RESUMO

La infección con Chlamydia trachomatis se considera la infección de transmisión sexual (ITS) de origen bacteriano más común(AU)


Assuntos
Humanos , Feminino , Chlamydia trachomatis , Infecções por Chlamydia , Infertilidade Feminina
9.
Medicentro (Villa Clara) ; 16(3)sept. 2012. tab
Artigo em Espanhol | CUMED | ID: cum-51036

RESUMO

Las grandes epidemias del virus de inmunodeficiencia humana y del virus de hepatitis C coinciden temporalmente en la historia reciente de la humanidad, por lo que fue propósito de esta investigación caracterizar la coinfección entre ambos virus en el período de 2004 al 2007 en nuestra provincia, en pacientes procedentes de la comunidad, del sanatorio y de la prisión. Se estudiaron 369 personas con virus de inmunodeficiencia humana y se observó que 65 (17,6 por ciento) estaban coinfectadas con el virus de hepatitis C. Se evidenció que la proporción de la coinfección no fue diferente en los lugares de residencia, aunque descriptivamente existió una mayor proporción en el sanatorio. El mayor número de pacientes se encontraba en las edades entre 35 y 44 años (27,8 por ciento). No existieron diferencias significativas de la coinfección según el sexo. En el 32,1 por ciento la orientación sexual de los coinfectados fue bisexual, seguido por los homosexuales, que resultaron estadísticamente significativos(AU)


Assuntos
Humanos , Infecções Oportunistas Relacionadas com a AIDS , Hepatite C , Comorbidade
13.
Medicentro ; 10(Supl SIDA)dic. 2006. ilus, tab
Artigo em Espanhol | CUMED | ID: cum-30980

RESUMO

La vigilancia de segunda generación propone algunos métodos para mejorar el uso de los datos, expandir y mejorar así la respuesta a la epidemia del VIH; por ello nos propusimos como Objetivo es diseñar un sistema automatizado para la vigilancia seroepidemiológica del VIH/SIDA, precisar la recogida del dato primario emitido por el Laboratorio que permita generar respuestas sostenidas, responsables y enfrentar esta epidemia a nivel de cada área de salud, grupo de riesgo y comunidad, con lo cual se convierte en una vigilancia apropiada. Basándonos en las facilidades que ofrece el MS Access para la creación, almacenamiento y procesamiento de bases de datos, confeccionamos el sistema automatizado VigEpSIDA. Resultados: Este sistema representa un avance importante para la actividad de Laboratorio, Estadísticas y Epidemiología, procesa los datos primarios, emite resultados precisos para cualquier período, a modo de informes, con lo que se reducen los costos de procesamiento, el tiempo y el personal empleado. Permite efectuar los análisis de la situación seroepidemiológica del VIH/SIDA. Conclusiones: Se puede aplicar en cualquier Laboratorio de Inmunodiagnóstico de VIH/SIDA del país. Sirve de guía para la vigilancia seroepidemiológica, y permite identificar las áreas de salud con dificultades, determinar cómo es la pesquisa serológica en cada grupo de riesgo, diseñar actividades preventivas y realizar intervenciones apropiadas, oportunas y rápidas. Es económicamente justificable, ya que implica una reducción considerable del tiempo y de los costos(AU)


Assuntos
Humanos , HIV , Bases de Dados como Assunto , Monitoramento Epidemiológico , Soroprevalência de HIV , Infecções por HIV
14.
Medicentro ; 9(3)2005. tab
Artigo em Espanhol | CUMED | ID: cum-31640

RESUMO

Introducción: En los últimos años, diversos factores han propiciado un incremento de la tuberculosis en el mundo, entre ellos, la infección por el virus de la inmunodeficiencia humana, que no solo permite la infección primaria y la reinfección por M. tuberculosis, sino también la rápida progresión de la enfermedad. Objetivo: Determinar el comportamiento de algunos indicadores relacionados con ambas enfermedades. Métodos: Se realizó un estudio retrospectivo a 25 pacientes coinfectados con VIH/SIDA y tuberculosis en la provincia de Villa Clara en los años 1990-2002, mediante la revisión de sus historias clínicas. Resultados: La tuberculosis pulmonar resultó ser más frecuente que la extrapulmonar. La mayoría de los pacientes (44,0 por ciento) desarrolló la tuberculosis de dos a cuatro años después de adquirir la infección por el virus de la inmunodeficiencia humana, con una media aritmética de 4,30 años. Predominó el sexo masculino con edades más frecuentes entre 30 y 39 años, mientras que en el femenino predominaron las de 20 y 29 años. No se demostró contacto previo con enfermos de tuberculosis en 13 pacientes. La prueba de la tuberculina mostró anergía en 20, y recibieron quimioprofilaxis por un año 21 pacientes. Se presentaron enfermedades oportunistas asociadas en 21 casos; de ellos, 52,4 por ciento curaron y 38,1 por ciento fallecieron. Las enfermedades oportunistas más frecuentes fueron: candidiasis bucal, pneumocytosis y neurotoxoplasmosis(AU)


Assuntos
Tuberculose Pulmonar , Infecções por HIV
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