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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Asociación de efectos adversos al tratamiento de mercaptopurinas con polimorfismos genéticos de la enzima TPTM en niños con leucemia linfoblástica aguda tratados en el Hospital Dr. Luis Calvo Mackenna

Canales López, Cristina 08 1900 (has links)
Memoria para optar al título de Química Farmacéutica / La Leucemia Linfoblástica Aguda (LLA) es la neoplasia más común en niños, siendo la 6-mercaptopurina (6-MP) una droga que cumple un rol fundamental para el tratamiento de esta neoplasia. Sin embargo, se han asociado al uso de esta droga una serie de efectos adversos. La presencia de polimorfismos presentes en genes que codifican enzimas involucradas en su metabolización, aparece como una de las principales causantes de los efectos adversos a 6-MP. Uno de los polimorfismos involucrados en el metabolismo de la 6-MP, corresponde a aquellos presentes en el gen TPMT*1 que codifica la enzima Tiopuril S-metiltransferasa (TPMT). Se han asociado a diversos polimorfismos en este gen, la presencia de concentraciones plasmáticas tóxicas de nucleótidos de tioguanina (TGNs), un metabolito de la 6-MP, aumentando el riesgo de desarrollar eventos adversos durante la terapia, lo que conduce al abandono o suspensión de la terapia, obligando a controlar o reducir las dosis recibidas de 6-MP en pacientes que presentan algún polimorfismo en el gen TPMT*1. El conocimiento de la prevalencia de este polimorfismo y su efecto en el tratamiento de la LLA ha permitido el desarrollo de una farmacogenética efectiva, mejorando sustancialmente la calidad de vida de los pacientes durante el tratamiento. Estudios previos de nuestro grupo permitieron encontrar la presencia de polimorfismos en el gen TPMT en un 8% de una población de 103 niños chilenos con LLA. En este trabajo se analizó la relación existente entre la presencia de polimorfismo en el gen TPMT*1 con los efectos adversos y la disminución de la dosis de 6-MP durante el periodo de mantención en el tratamiento de la LLA. El análisis de 35 pacientes con LLA atendidos en el Hospital Dr. Luis Calvo Mackenna muestra que se administra una dosis significativamente menor de 6-MP durante el periodo de mantención en los niños con LLA que presentan un alelo polimórfico del gen TPMT*1. Los resultados obtenidos apoyan el uso de una farmacogenética efectiva para el tratamiento de la LLA en nuestro país. / Acute lymphoblastic leukemia (ALL) is the most common malignancy in children. The drug 6-mercaptopurine (6-MP) plays a fundamental role in the treatment of this malignancy. However, a number of side effects have been associated with the use of this drug. The presence of polymorphisms in genes encoding enzymes involved in its metabolism, appears as a major cause of adverse effects of 6-MP. Several of the polymorphisms involved in the metabolism of 6-MP corresponds to those present in the gene encoding the TPMT*1 enzyme, Tiopuril S-methyltransferase (TPMT). Some of these have been associated with the presence of toxic plasma concentrations of thioguanine nucleotides (TGNs), metabolites of 6-MP. These metabolites increase the risk of adverse events during therapy, leading to the abandonment or suspension of therapy, and demand an increased control of 6-MP doses in patients with a polymorphism of this gene. Knowledge of the prevalence of this polymorphism and its effect on the treatment of ALL has allowed the development of an effective pharmacogenetic approach, substantially improving the quality of life of patients during treatment. Previous studies from our group found polymorphisms in the TPMT gene in 8% of a population of 103 Chilean children with ALL. In this work we analyzed the relationship between the presence of one polymorphism of the TPMT*1gene with the side effects and the decrease of the 6-MP dose during the treatment of ALL and the decrease of the 6-MP dose during maintenance treatment of ALL. The analysis of 35 patients with ALL treated at the Hospital Dr. Luis Calvo Mackenna shows that there is a significant decrease in the dose of 6-MP during maintenance in children with ALL with a polymorphic allele of the TPMT*1gene. The results support the use of an effective pharmacogenetics strategy for the treatment of ALL in our country.
2

Síntese e avaliação biológica de derivados de 6-mercaptopurina, carboidratos e aminoálcoois

Corrales, Roberta Cristina Novaes Reis 17 June 2011 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-26T19:22:03Z No. of bitstreams: 1 robertacristinanovaesreiscorrales.pdf: 3333393 bytes, checksum: a90614981046f5f6e0791845afd8c1fd (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-13T12:05:49Z (GMT) No. of bitstreams: 1 robertacristinanovaesreiscorrales.pdf: 3333393 bytes, checksum: a90614981046f5f6e0791845afd8c1fd (MD5) / Made available in DSpace on 2017-05-13T12:05:49Z (GMT). No. of bitstreams: 1 robertacristinanovaesreiscorrales.pdf: 3333393 bytes, checksum: a90614981046f5f6e0791845afd8c1fd (MD5) Previous issue date: 2011-06-17 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A tese de doutorado intitulada Síntese e Avaliação Biológica de Derivados de 6-Mercaptopurina, Carboidratos e Aminoálcoois está apresentada em três capítulos que descrevem a síntese e caracterização de compostos com potencial atividade antiparasitária (Leishmania, Plasmodium berghei), antibacteriana (bactérias Gram positiva e negativa, Mycobacterium tuberculosis) e em macrófagos peritoneais de mamíferos. Foram obtidos 53 compostos neste trabalho, sendo 30 inéditos, a saber: no capitulo 1 foi descrita a síntese de 27 compostos, sendo 14 derivados inéditos de 6mercaptopurina (6-MP); no capítulo 2 foi descrita a síntese de 14 compostos, sendo 6 derivados inéditos da D-glicose e 1 derivado inédito da D-ribonolactona; no capítulo 3 foi descrita a síntese de 14 compostos, sendo 9 aminoálcoois inéditos. O primeiro capítulo mostra a síntese de derivados de 6-MP contendo 1,2,3-triazol e derivados de esteróides. Os derivados triazólicos de 6-MP foram obtidos através de uma reação de cicloadição 1,3-dipolar tipo “click” usando um alcino terminal e um grupo azido. Os derivados de 6-MP contendo esteróides, sem o espaçador triazólico, foram obtidos através de uma reação de substituição nucleofílica entre o sal de 6-MP e mesilatos do ácido cólico e do ácido desoxicólico. Dentre os compostos submetidos à avaliação biológica, os derivados de 6-MP conjugados com esteróides apresentaram melhor atividade em Leishmania e a maioria apresentou importante atividade em P. berghei. Nenhum composto testado apresentou citotoxicidade in vitro para macrófagos peritoneais de camundongos até a máxima concentração de 48 µg/mL. O segundo capítulo mostra a síntese e caracterização de derivados da D-glicose contendo 1,2,3-triazol, obtidos através de reação tipo “click” e de derivados da D-gliconolactona e D-ribonolactona. Apesar dos compostos testados não terem apresentado atividade antiparasitária e antibacteriana efetiva, nenhum apresentou toxidez para os macrófagos de mamíferos. O terceiro capítulo descreve a síntese e caracterização de derivados aminoálcoois aromáticos com variada extensão de cadeia e de função química e apresentaram importante atividade biológica, principalmente em L. major. As estruturas dos produtos obtidos foram elucidadas pelos seus espectros na região do infravermelho, Ressonância Magnética Nuclear de 1H e 13C, Mapa de contornos homonuclear COSY, faixa de fusão e espectros de massas de alta resolução. / The doctoral thesis entitled Synthesis and Biological Evaluation of Derivatives of 6-Mercaptopurine, Carbohydrates and Aminoalcohol is presented in three chapters that describe the synthesis and characterization of compounds with potential antiparasitic activity (Leishmania, Plasmodium berghei), antibacterial (bacteria Gram positive and negative, Mycobacterium tuberculosis) and peritoneal macrophages of mammals. 53 compounds were obtained in this work, with 30 firsts, namely: Chapter 1 was described in the synthesis of compounds 27, 14 novel derivatives of 6-mercaptopurine (6MP), was described in Chapter 2 the synthesis of compounds 14, 6 being derived from unpublished 1 D-glucose and derived novel D-ribonolactona, was described in Chapter 3 the synthesis of compounds 14, 9 amino unpublished. The first chapter shows the synthesis of derivatives of 6-MP containing 1,2,3triazole derivatives and steroids. The triazole derivatives of 6-MP were obtained by a reaction of type 1,3-dipolar cycloaddition "click" using a terminal alkyne and an azide group. Derivatives of 6-MP containing steroids, without the spacer triazole, was obtained through a nucleophilic substitution reaction between the salt of 6-MP and mesylates cholic acid and deoxycholic acid. Among the compounds subjected to biological evaluation, derivatives of 6-MP in conjunction with steroids showed better activity in Leishmania and most showed a significant activity in P. berghei. No compound tested showed cytotoxicity in vitro for mouse peritoneal macrophages to g / mL.µthe maximum concentration of 48 µg/mL. The second chapter shows the synthesis and characterization of D-glucose derivatives containing 1,2,3-triazole, obtained by reaction type "click" derivatives of Dgliconolactona and D-ribonolactona. Although the compounds tested did not show effective antibacterial and antiparasitic activity, showed no toxicity to mammalian macrophages. The third chapter describes the synthesis and characterization of aromatic amino derivatives with varied chain length and chemical function and had significant biological activity, especially in L. Major. The structures of the products obtained were elucidated by their spectra in the infrared, 1H NMR and 13C, homonuclear COSY contour map, melting point and mass spectra with high resolution.
3

Avaliação da atividade antiplasmodial de análogos da cloroquina

Souza, Nicolli Bellotti de 22 February 2011 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-09-15T12:09:54Z No. of bitstreams: 1 nicollibellottidesouza.pdf: 1508500 bytes, checksum: 7150363e1a046cd4741555cb142f6f21 (MD5) / Approved for entry into archive by Diamantino Mayra (mayra.diamantino@ufjf.edu.br) on 2016-09-26T20:18:43Z (GMT) No. of bitstreams: 1 nicollibellottidesouza.pdf: 1508500 bytes, checksum: 7150363e1a046cd4741555cb142f6f21 (MD5) / Made available in DSpace on 2016-09-26T20:18:43Z (GMT). No. of bitstreams: 1 nicollibellottidesouza.pdf: 1508500 bytes, checksum: 7150363e1a046cd4741555cb142f6f21 (MD5) Previous issue date: 2011-02-22 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A malária é causada por protozoários do gênero Plasmodium e é responsável por 250 milhões de casos e 1 milhão de mortes anualmente. Um dos principais empecilhos para o controle da doença é o desenvolvimento de resistência do parasito aos fármacos comumente usados, o que torna urgente a pesquisa por novos antimaláricos. Nesse contexto, análogos de cloroquina acoplados a 6-mercaptopurina e a alquil aminas e complexos de platina foram avaliados quanto a atividade antimalárica utilizando o teste supressivo descrito por Peters em modelo murino de infecção por Plasmodium berghei NK65. Tais análogos exibiram altos valores de supressão da parasitemia, entre 60% e 94% em comparação com o controle não tradado. Considerando o papel imunossupressor de derivados de purina, o análogo de cloroquina acoplado a 6-mercaptopurina MPQUI foi avaliado quanto a aspectos imunológicos (contagem de leucócitos específicos, dosagem de TNF-α e IL-10), não interferindo na resposta imune tendo como base os parâmetros analisados. Portanto, esses análogos devem ser objetos de futuras pesquisas, podendo fornecer novos antimaláricos, já que apresentaram-se promissores e não influenciaram a resposta imune nos parâmetros analisados. / Malaria is caused by protozoan parasites of the genus Plasmodium and is responsible for 250 million cases and 1 million deaths annually. One of the main obstacles for the disease control is the development of resistance by the parasite to the commonly used antimalarials, what makes the research for new ones urgent. In this context, chloroquine analogs attached to 6-mercaptopurine and to alkyl-amines and platinum complexes were evaluated for their antimalarial activity using the 4-day suppressive test described by Peters which was carried out in mice infected with Plasmodium berghei NK65. These analogs exhibited high values of parasitemia suppression, which ranged from 60% to 94% in comparison to untreated control. Considering the immune suppressor role of purine derivates, the chloroquine analog attached to 6-mercaptopurine MPQUI was evaluated for immunological aspects (specific leukocytes count, TNF-α and IL-10 measurements in sera of mice), revealing no interference in the immune response considering these parameters. Therefore, these analogs may be objects of further research, aiming at new antimalarials, since they were shown to be promising and did not influence the immune response in the parameters analyzed.

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