ABSTRACT
PURPOSE: Postoperative ileus (POI) is an impairment of coordinated gastrointestinal (GI) motility that develops as a consequence of abdominal surgery and is a major factor contributing to patient morbidity and prolonged hospitalization. The aim of this study was to investigate the effects of different 5-hydroxytryptamine 4 (5-HT4) receptor agonists, which stimulate excitatory pathways, on a POI model. MATERIALS AND METHODS: The experimental model of POI in guinea pigs was created by laparotomy, gentle manipulation of the cecum for 60 seconds, and closure by suture, all under anesthesia. Different degrees of restoration of GI transit were measured by the migration of charcoal. Colonic transit was indirectly assessed via measurement of fecal pellet output every hour for 5 hours after administration of various doses of mosapride, tegaserod, prucalopride, and 5-HT. RESULTS: Charcoal transit assay showed that various 5-HT4 receptor agonists can accelerate delayed upper GI transit in a dose-dependent manner. However, fecal pellet output assay suggested that only prucalopride had a significant effect in accelerating colonic motility in POI. CONCLUSION: Although mosapride, tegaserod, and prucalopride produce beneficial effects to hasten upper GI transit in the POI model, prucalopride administered orally restores lower GI transit as well as upper GI transit after operation in a conscious guinea pig. This drug may serve as a useful candidate for examination in a clinical trial for POI.
Subject(s)
Animals , Male , Administration, Oral , Benzamides/pharmacology , Benzofurans/administration & dosage , Charcoal/pharmacokinetics , Colon/drug effects , Dose-Response Relationship, Drug , Gastrointestinal Motility/drug effects , Guinea Pigs , Ileus/surgery , Indoles/pharmacology , Laparotomy , Morpholines/pharmacology , Postoperative Complications/drug therapy , Serotonin/pharmacology , Serotonin 5-HT4 Receptor Agonists/pharmacologyABSTRACT
En esta investigación se pretende estimular el desarrollo de protocormos de Masdevallia coccinea y Maxillaria nutans bajo condiciones in vitro utilizando diferentes concentraciones de ácido indol acético y carbón activado. El protocolo obtenido es una alternativa de la conservación de orquídeas que se encuentran en vías de extinción, y además permite contribuir con el mejoramiento medioambiental. En la evaluación del desarrollo vegetativo bajo condiciones in vitro de los protocormos de Masdevallia coccinea y Maxillaria nutans, orquídeas en vías de extinción, se obtuvo que solamente Maxillaria nutans alcanzará su desarrollo exitoso mediante el cultivo in vitro en el medio Murashige y Skoog (1962), donde se evaluó el efecto de la interacción entre el carbón activado (0,0; 0,5, 1,0 % (p/v)) y el ácido indol acético (0,0; 0,5; 1,0 mg/L-1). El medio de cultivo empleado fue enriquecido con sacarosa al 3% y el Myo inositol al 0,1 g/L-1. Los protocormos de Masdevallia coccinea evidenciaron que se encontraban inmaduros, situación por la cual no lograron su desarrollarlo vegetativo en el experimento planteado, en atención a que se encontraban en el periodo de latencia. Por esta razón, es de gran importancia tener en cuenta que las cápsulas de las orquídeas deben estar bien maduras, a fin de garantizar que los protocormos que se forman in vitro sean maduros y completen con facilidad su morfofisiológía. Mientras que los protocormos de Maxillaria nutans dieron un mayor rendimiento en su desarrollo vegetativo. En esta investigación se determinó que el efecto de la interacción de 0,5% de carbón activado con 0,5 mg/L-1 de AIA es positivo sobre la tasa de crecimiento para el desarrollo de los protocormos de Maxillaria nutans bajo condiciones in vitro.
The evaluation of protocorms growth of Masdevallia coccinea and Maxillaria nutans under in vitro conditions, endangered orchids, it got only Maxillaria nutans reached its successful development by culture in vitro in Murashige and Skoog (1962), which evaluated the effect of the interaction between the activated carbon (0.0, 0.5, 1,0% (w / v)) and indole acetic acid (0.0, 0.5, 1.0 mg.L-1). The culture medium used was enriched with 3% sucrose and 0.1 g/L-1 Myo inositol. Protocorms of Masdevallia coccinea, showed that they were immature, state why they did not achieve their vegetative development in the experiment raised, considering that they were in the latency period. It is therefore very important to note that the capsules of the orchid should be ripe, to ensure that protocorms formed in vitro are mature and they respond with ease morphphysiology development. While protocorms of Maxillaria nutans, gave a higher yield in its vegetative development. This research found that the interaction effect of 0.5% activated carbon with 0.5 mg/L-1 of IAA is positive on the growth rate for the development of Maxillaria nutans protocorms under in vitro conditions. The protocol obtained in this investigation is an alternative of conservation of orchids that are endangered and can contribute to further environmental improvement.
Subject(s)
Charcoal/administration & dosage , Charcoal/analysis , Charcoal/adverse effects , Charcoal/pharmacokinetics , Charcoal/pharmacology , Charcoal/chemistry , Charcoal/chemical synthesis , CharcoalABSTRACT
O presente trabalho descreve método fácil de preparo de complexo carvão-GM1 e a avaliação de sua estabilidade em diferentes valores de pH (1,2, 7,0 e 8,3). O método proposto mostrou-se efetivo e o complexo resultante apresentou estabilidade adequada nos valores de pH estudados