Made available in DSpace on 2014-12-17T14:03:37Z (GMT). No. of bitstreams: 1
NorbertoKVM_DISSERT.pdf: 2522986 bytes, checksum: 6298d49730e0d9c9d5418ad46a9b33f5 (MD5)
Previous issue date: 2011-02-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Studies indicate that several components were isolated from medicinal plants, which have antibacterial, antifungal, antitumor and anti-inflammatory properties. Sepsis is characterized by a systemic inflammation which leads to the production of inflammatory mediators exacerbated by excessive activation of inflammatory cells and disseminated intravascular coagulation (DIC), in which the human neutrophil elastase plays an important role in its pathogenesis. Several epidemiological studies suggest that components of plants, especially legumes, can play a beneficial role in reducing the incidence of different cancers. A chymotrypsin inhibitor of Kunitz (Varela, 2010) was purified from seeds of Erythrina velutina (Mulungu) by fractionation with ammonium sulfate, affinity chromatography on Trypsin-Sepharose, Chymotrypsin-Sepharose and ion exchange chromatography on Resource Q 1 ml (GE Healthcare) in system FPLC / AKTA. The inhibitor, called EvCI, had a molecular mass of 17 kDa determined by SDS-PAGE. The purified protein was able to inhibit human neutrophil elastase (HNE), with an IC50 of 3.12 nM. The EvCI was able to inhibit both pathways of HNE release stimulated by PAF and fMLP (75.6% and 65% respectively). The inhibitor also inhibited leukocyte migration in septic mice about 87% and prolonged the time of coagulation and inhibition factor Xa. EvCI showed neither hemolytic activity nor cytotoxicity. EvCI showed a selective antiproliferative effect to HepG2 cell lines with IC50 of 0.5 micrograms per milliliter. These results suggest EvCI as a molecule antagonist of PAF / fMLP and a potential use in fighting inflammation related disorders, disseminated intravascular coagulation (DIC) and cancer / Estudos indicam que v?rios componentes medicinais foram isolados de vegetais, os quais apresentam atividades antibacterianas, antif?ngicas, antitumorais e anti-inflamat?rias. Sepse ? caracterizada por uma inflama??o sist?mica que tem como conseq??ncia a produ??o exarcebada de mediadores inflamat?rios, pela excessiva ativa??o de c?lulas inflamat?rias e coagula??o intravascular disseminada (CIVD), na qual a elastase neutrof?lica humana exerce um papel importante na sua patog?nese. Diversos estudos epidemiol?gicos sugerem que componentes de vegetais, especialmente de leguminosas, podem desempenhar um papel ben?fico na redu??o da incid?ncia de diferentes tipos de c?ncer. Um inibidor de quimotripsina do tipo Kunitz (Varela, 2010) foi purificado de sementes de Erythrina velutina (Mulungu) por fracionamento com sulfato de am?nio, cromatografias de afinidade em Tripsina-Sepharose e Quimotripsina-Sepharose e cromatografia de troca i?nica em Resource Q 1 mL (GE Healthcare), em sistema FPLC/AKTA. O inibidor, denominado EvCI, apresentou uma massa molecular de 17 kDa, determinada por SDS-PAGE. A prote?na purificada foi capaz de inibir a elastase de neutr?filos humanos (ENH), apresentando um IC50 de 3,12 nM. O EvCI foi capaz de inibir ambas as vias de libera??o de ENH estimuladas por PAF e fMLP (75,6% e 65%, respectivamente). O inibidor tamb?m inibiu a migra??o leucocit?ria em camundongos s?pticos em cerca de 87% e prolongou o tempo de coagula??o com inibi??o do fator Xa. EvCI n?o apresentou atividade hemol?tica nem citot?xica. EvCI apresentou um efeito antiproliferativo seletivo para linhagens de c?lulas HepG2 com IC50 de 0,5 μg /mL. Estes resultados sugerem o EvCI como uma mol?cula antagonista dos receptores PAF/fMLP e um potencial emprego no combate a dist?rbios relacionados a inflama??o, coagula??o intravascular disseminada (CIVD) e cancer
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12579 |
| Date | 22 February 2011 |
| Creators | Monteiro, Norberto de K?ssio Vieira |
| Contributors | CPF:58024867320, http://lattes.cnpq.br/6644671747055211, Souza, Giulianna Paiva Viana de Andrade, CPF:75523400378, http://lattes.cnpq.br/9747224552107070, Franco, Oct?vio Luiz, CPF:75523400378, http://lattes.cnpq.br/8598274096498065, Uchoa, Adriana Ferreira |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Bioqu?mica, UFRN, BR, Bioqu?mica; Biologia Molecular |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0029 seconds