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Id: lil-749628
Autor: del Valle Mondragón, Leonardo; Tenorio López, Fermín Alejandro; Torres Narváez, Juan Carlos; Zarco Olvera, Gabriela; Pastelín Hernández, Gustavo.
Título: Estudio de los extractos de Magnolia grandiflora sobre el músculo cardíaco de cobayo / Study of Magnolia Grandiflora extracts in guinea pigs cardiac muscle
Fonte: Arch. cardiol. Méx;74(2):108-117, abr.-jun. 2004. ilus.
Idioma: es.
Resumo: Se evaluó farmacológicamente los extractos de diversas variedades de Magnolia grandiflora sobre el músculo cardíaco. Se recolectó en el período de marzo a julio hojas y flores de Magnolia grandiflora nativa del Instituto Nacional de Cardiología "Ignacio Chávez", de la zona norte, poniente y oriente del Distrito Federal, de los estados de Puebla, Colima y Chiapas. Éstas se procesaron por separado y los extractos se obtuvieron por maceración con una mezcla de etanol-agua (1:3 v/v) a 4°C durante dos semanas. El análisis cualitativo se realizó por cromatografía en capa fina, columna y de líquidos de alta resolución (CLAR). El análisis funcional y molecular se efectuó por reactividad química específica y resonancia magnética protónica (RMN ¹H). La evaluación farmacológica se realizó en corazones aislados de cobayo macho. Los extractos, fracciones y compuestos se administraron en bolos seriados bajo un estudio de curvas dosis-respuesta gradual en donde se midió la presión intraventricular izquierda y la presión de perfusión coronaria, evaluando así el efecto inotrópico positivo y vasodilatador de los extractos de Magnolia grandiflora. Se identificó y aisló vulgarenol y 2-p-hidroxifenil-2-OH-etilamina, por lo que los resultados sugieren que su efecto vasodilatador e inotrópico positivo, se deben a la presencia de estas sustancias, las cuales se complementan con magnograndiólido y tiramina.

Several extracts from diverse Magnolia grandiflora varieties were pharmacological evaluated in the cardiac muscle. From March to July, flowers and leaves from Magnolia grandiflora, native from the National Institute of Cardiology "Ignacio Chávez", from north, west, and orient zones from Mexico City, and from Puebla, Colima and Chiapas states were collected. They were separately processed and the extracts were obtained by maceration with ethanol-water (1:3 v/v) at 4°C during two weeks. Qualitative analysis was accomplished with thin-layer, column and high-performance liquid chromatographies (HPLC). Functional and molecular analysis was made by specific chemical reactivity and by protonic magnetic resonance (RMN ¹H). Pharmacological evaluation was completed in isolated and perfused male guinea pigs hearts. Extracts, fractions, and compounds were administrated by serial bolus in a gradual dose-response curves study in which left intraventricular pressure and coronary perfusion pressure were recorded, evaluating by such the positive inotropic and vasodilator effects of Magnolia grandifloraextracts. Vulgarenol and 2-p-hydroxyphenyl-2-hydroxy-ethylamine were isolated and identified, and the obtained results suggest that its positive inotropic and vasodilator effects are owed to these substances, being complemented by magnograndiolide and tyramine.
Descritores: Coração/efeitos dos fármacos
Magnolia
Extratos Vegetais/farmacologia
-Estudos de Casos e Controles
Cromatografia em Gel
Vasos Coronários/efeitos dos fármacos
Vasos Coronários/fisiologia
Coração/fisiologia
Espectroscopia de Ressonância Magnética
Miocárdio/metabolismo
Função Ventricular Esquerda/efeitos dos fármacos
Função Ventricular Esquerda/fisiologia
Pressão Ventricular/efeitos dos fármacos
Pressão Ventricular/fisiologia
Limites: Animais
Cobaias
Masculino
Tipo de Publ: Estudo Comparativo
Responsável: MX1.1 - CENIDSP - Centro de Información para Decisiones en Salud Pública


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Id: lil-492282
Autor: Sánchez-Velásquez, L. R; Pineda-López, M. del R.
Título: Species diversity, structure and dynamics of two populations of an endangered species, Magnolia dealbata (Magnoliaceae)
Fonte: Rev. biol. trop;54(3):997-1002, sept. 2006.
Idioma: en.
Resumo: Little is known about the ecology and demography of the genus Magnolia. Magnolia dealbata Zucc. is an endangered species endemic to Mexico. Two contrasting populations of M. dealbata (one from the grasslands and other from a secondary cloud forest) were studied. We asked the following questions: (a) Are size structure (diameter at breast height, DBH) and infrutescence production significantly different between the two populations? (b) What are the populations' growth rates (lambda) based on an initial 1987 study? (c) Are the associated species diversity indices of these M. dealbata populations significantly different? The results show no significant differences between the population size structure (p=.094); the growth rates of the populations were 0.992 in grassland and 1.053 in secondary cloud forest. The number of infrutescences produced in year 2001 and DBH relationship were significantly linear (p<.001) in both populations, and there was no significant difference (p>.01) between their slopes. The diversity indices were not significantly different (p>.05), and only 54% of the species were common to both sites. Our study suggests that both populations are relatively stable and that the management history could impact more on the species composition than on the diversity indices.
Descritores: Variação Genética
Magnolia/genética
-México
Densidade Demográfica
Dinâmica Populacional
Especificidade da Espécie
Magnolia/fisiologia
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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