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Evaluación de la eficacia de formulaciones de anfotericina B encapsulada en micelas poliméricas como opción terapéutica en un modelo de Candidiasis en larvas de Galleria mellonella.

dc.contributor.advisorPérez Pérez, León Daríospa
dc.contributor.advisorParra Giraldo, Claudia Marcelaspa
dc.contributor.authorVillamil Poveda, Jean Carlosspa
dc.contributor.researchgroupGrupo de Investigación en Macromoléculas / Laboratorio de micosis humanas y proteómicaspa
dc.date.accessioned2020-03-05T22:10:08Zspa
dc.date.available2020-03-05T22:10:08Zspa
dc.date.issued2019-06-01spa
dc.description.abstractAmphotericin B (AMB) is a broad-spectrum antifungal drug. It is commonly used to treat systemic fungal infections and has few reports of fungal resistance. However, its widespread use is limited by its toxicity. When polymeric micelles are used not only increases the solubility of AMB in aqueous media, but also decreases its toxicity. However, polymeric micelles have low AMB encapsulation performance since they interact weakly with the drug, which is an amphiphilic and amphoteric molecule. In this work, the effect of the conjugation of PEG-b-PCL with cholesterol was investigated. PEG-b-PCL is a biocompatible and biodegradable diblock copolymer that is commonly used to encapsulate medications. The results indicate that the presence of cholesterol increased encapsulation efficiency and AMB loading capacity in polymeric micelles; in turn, improves the ability to release it in a controlled manner. Compared to Fungizone®, which was taken as a reference, polymeric micelles loaded with AMB showed lower in vitro efficacy against Candida albicans SC5314, this was evidenced in the increase in the minimum inhibitory concentration. However, in vivo evaluation of antifungal activity using Galleria mellonella's invertebrate model showed comparable efficacy. The cytotoxicity of AMB against L929 fibroblasts and red blood cells decreased for micellar formulations with respect to the reference. The results indicate that PEG-b-PCL copolymers are promising vehicles in the development of AMB micellar formulations..spa
dc.description.abstractLa anfotericina B (AMB) es un fármaco antifúngico de amplio espectro de acción. Es comúnmente utilizado para tratar micosis sistemicas y presenta pocos reportes de resistencia fúngica. Sin embargo, su uso generalizado se ve limitado por su toxicidad. Cuando se emplean micelas poliméricas no solo aumenta la disolución de AMB en medios acuosos, sino que también disminuye su toxicidad. Sin embargo, las micelas poliméricas tienen un bajo rendimiento de encapsulación de AMB ya que interactúan débilmente con el fármaco, que es una molécula anfifílica y anfótera. En este trabajo, se investigó el efecto de la conjugación de PEG-b-PCL con colesterol. El PEG-b-PCL es un copolímero dibloque biocompatible y biodegradable que se usa comúnmente para encapsular fármacos. Los resultados indican que la presencia de colesterol aumentó la eficiencia de encapsulación y la capacidad de carga de AMB en las micelas poliméricas; a su vez, mejora la capacidad de liberarla de manera controlada. En comparación con Fungizone®, el cual se tomó como referencia, las micelas poliméricas cargadas con AMB presentaron una eficacia in vitro más baja contra Candida albicans SC5314, esto se evidenció en el aumento de la concentración mínima inhibitoria. Sin embargo, la evaluación in vivo de la actividad antifúngica utilizando el modelo invertebrado de Galleria mellonella mostró una eficacia comparable. La citotoxicidad de AMB frente a fibroblastos L929 y glóbulos rojos disminuyó para las micelas cargadas con AMB respecto al control. Los resultados indican que copolímeros PEG-b-PCL son vehículos promisorios para encapsular y liberar AMB.spa
dc.description.degreelevelMaestríaspa
dc.format.extent80spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/75903
dc.language.isospaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentInstituto de Biotecnologíaspa
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dc.rightsDerechos reservados - Universidad Nacional de Colombiaspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial 4.0 Internacionalspa
dc.rights.spaAcceso abiertospa
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/spa
dc.subject.proposalAmphotericin Beng
dc.subject.proposalanfotericina Bspa
dc.subject.proposalinfecciones fúngicasspa
dc.subject.proposalfungal infectionseng
dc.subject.proposalmicellar systemseng
dc.subject.proposalsistemas micelaresspa
dc.subject.proposalcolesterolspa
dc.subject.proposalcholesteroleng
dc.titleEvaluación de la eficacia de formulaciones de anfotericina B encapsulada en micelas poliméricas como opción terapéutica en un modelo de Candidiasis en larvas de Galleria mellonella.spa
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_970fb48d4fbd8a85spa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/publishedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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