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dc.rights.licenseAtribución-NoComercial 4.0 Internacional
dc.contributor.advisorCuca Suarez, Luis Enrique
dc.contributor.authorMuñoz Cendales, Diego Ricardo
dc.date.accessioned2020-07-24T16:54:26Z
dc.date.available2020-07-24T16:54:26Z
dc.date.issued2020-07-23
dc.identifier.citationMuñoz, D & Cuca, L. (2020). Estudio fitoquímico de la especie vegetal Piper eriopodon y determinación de su actividad citotóxica. Universidad Nacional de Colombia, Bogotá, Colombia.
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/77848
dc.description.abstractThe cytotoxic effect of different Colombian Piper plants was determined by the MTT assay in human cancer cell lines A549 (lung), PC-3 (prostate) and MDAMB-231 (breast). The most potent cytotoxic effect was found in the leaves ethanolic extract of P. eriopodon with IC50 values less than 25 μg/mL. After different chromatographic techniques, nine alkenylphenols (1 - 9) were isolated from the ethanolic extract of leaves from P. eriopodon and their molecular structures were identified by the analysis of the spectroscopic data (IR; NMR 1H, 13C 1D and 2D; HRESIMS), as well as by comparison of the spectral data with those reported in the literature. Of note, compounds 2, 3, 4, 5, 6, 7, 8 and 9 were reported for the first time. All isolated compounds showed cytotoxicity against the human cancer cell lines U373 (glioblastoma) and MCF7 (breast) with IC50 values in a range of 1.78 - 40.14 μg/mL. The higher cytotoxic effect of compounds 1, 2 and 3 was also shown by MTT assay using additional cancer cell lines A549 (lung), PC-3 (prostate) and non-tumourigenic HUVEC and human breast MCF10 cells. Compound 1 was the most potent inhibitor of human cancer cell viability, follow by compounds 2 and 1 respectively. Compounds 1 and 2 induced apoptosis through mitochondrial permeabilization and caspase activation while compound 3 acted on cell fate via caspase-independent/non-apoptotic mechanisms, likely involving mitochondrial dysfunctions and aberrant generation of reactive oxygen species (ROS). Finally, in silico modelling and molecular approaches suggested that all molecules inhibit XIAP by binding to XIAP-BIR3 domain. The results confirm the therapeutic potential of isolated compounds from P. eriopodon and demonstrates that XIAP is a key determinant of tumor control, at the molecular crossroad of caspase-dependent/independent cell death pathways.
dc.description.abstractEn este trabajo, se evaluó el efecto citotóxico de diferentes especies colombianas del género Piper, por medio del ensayo del MTT en líneas celulares de cáncer humano A549 (pulmón), PC-3 (próstata) y MDA-MB-231 (mama). El extracto etanólico de hojas de P. eriopodon presentó el mayor efecto citotóxico con valores de IC50 por debajo de 25 μg/mL; y su fraccionamiento llevó al aislamiento de nueve compuestos (1-9) de tipo alquenilfenol. Los compuestos 2, 3, 4, 5, 6, 7, 8 y 9 son reportados por primera vez y sus estructuras químicas fueron establecidas por medio del análisis detallado de sus datos espectroscópicos (IR; RMN 1H, 13C 1D y 2D, HRESIMS) y la comparación con los datos reportados en la literatura. Todos los compuestos aislados mostraron tener propiedades citotóxicas en líneas celulares de cáncer humano U373 (glioblastoma) y MCF7 (mama) con valores de IC50 en un rango de 1.78 a 40.14 μg/mL. Los compuestos 1, 2 y 3 presentaron el efecto citotóxico más potente y fueron adicionalmente evaluados en células tumorales A549 (pulmón) y PC-3 (próstata), así como en células no tumorales HUVEC y MCF10. El compuesto 3 fue el inhibidor más potente en la viabilidad celular, seguido de los compuestos 2 y 1 respectivamente. Adicionalmente, se determinó que los compuestos 1 y 2 inducen apoptosis por medio de permeabilización mitocondrial y activación de caspasas, mientras que el compuesto 3 induce muerte celular independiente de caspasas que involucra disfunción mitocondrial y una producción aberrante de especies reactivas de oxígeno (ROS). Finalmente, se realizaron estudios in silico con el fin de evaluar el potencial efecto antagonista sobre la proteína XIAP, encontrando que los tres compuestos evaluados podrían unirse al dominio BIR3 de la proteína XIAP. Estos resultados confirman el potencial farmacológico que tienen los compuestos aislados de P. eriopodon y permiten demostrar el papel fundamental que tiene la proteína XIAP en el control de tumores, proporcionando información importante sobre la participación de XIAP en mecanismos de muerte celular tanto dependientes como independientes de caspasas.
dc.description.sponsorshipColciencias
dc.format.extent167
dc.format.mimetypeapplication/pdf
dc.language.isospa
dc.rightsDerechos reservados - Universidad Nacional de Colombia
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subject.ddc540 - Química y ciencias afines
dc.titleEstudio fitoquímico de la especie vegetal Piper eriopodon y determinación de su actividad citotóxica
dc.typeTrabajo de grado - Doctorado
dc.rights.spaAcceso abierto
dc.description.projectConvocatoria Nacional para estudios de Doctorado en Colombia "Francisco José de Caldas" No 528 de 2011
dc.description.additionalLínea de Investigación: Bioprospección en agentes terapéuticos
dc.type.driverinfo:eu-repo/semantics/doctoralThesis
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dc.publisher.programBogotá - Ciencias - Doctorado en Ciencias - Química
dc.contributor.researchgroupQuímica de Productos Naturales Vegetales Bioactivos
dc.description.degreelevelDoctorado
dc.publisher.departmentDepartamento de Química
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotá
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.subject.proposalCáncer
dc.subject.proposalCancer
dc.subject.proposalApoptosis
dc.subject.proposalApoptosis
dc.subject.proposalMuerte independiente de caspasas
dc.subject.proposalCaspase independent cell death
dc.subject.proposalXIAP
dc.subject.proposalXIAP
dc.subject.proposalAlkenylphenols
dc.subject.proposalAlquenilfenoles
dc.subject.proposalPiper eriopodon
dc.subject.proposalPiper eriopodon
dc.type.coarhttp://purl.org/coar/resource_type/c_db06
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.contentText
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2


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