Submitted by Ubirajara Cruz (ubirajara.cruz@gmail.com) on 2018-06-08T14:07:09Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) tese_tanise_fortes.pdf: 1277949 bytes, checksum: 4aec80165f53d0b2f587adbcc608f856 (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-06-11T16:56:11Z (GMT) No. of bitstreams: 2 tese_tanise_fortes.pdf: 1277949 bytes, checksum: 4aec80165f53d0b2f587adbcc608f856 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-06-11T16:56:11Z (GMT). No. of bitstreams: 2 tese_tanise_fortes.pdf: 1277949 bytes, checksum: 4aec80165f53d0b2f587adbcc608f856 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-02-21 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / A leptospirose é uma zoonose de ocorrência mundial causada por membros patogênicos do gênero Leptospira. Em países em desenvolvimento, como o Brasil, a doença representa um grave problema de saúde pública. Os hospedeiros suscetíveis adquirem a doença através do contato com urina, água ou solo contaminados com a bactéria. Além dos roedores, os bovinos e os caninos se destacam como importantes reservatórios de Leptospira spp, tornando a vacinação dos animais suscetíveis uma das principais formas de prevenção da doença. As vacinas disponíveis comercialmente são bacterinas que induzem resposta imune humoral predominantemente contra o lipopolissacarídeo (LPS) bacteriano e que não são capazes de fornecer proteção de longo prazo contra a infecção. As proteínas da membrana externa de Leptospira spp tem sido avaliadas como candidatos vacinais em modelo animal e são uma alternativa promissora às formulações comerciais em uso. Dessa maneira, o objetivo deste estudo foi realizar a triagem de preparações vacinais contendo proteínas recombinantes de Leptospira spp, visando o desenvolvimento de uma vacina contra a leptospirose. Cinco genes, LIC11889, LIC10666, LIC10498, LIC12666 e LIC10463, foram identificados e amplificados a partir do genoma de Leptospira interrogans sorovar Copenhageni cepa Fiocruz L1-130. Desses genes, quatro (LIC11889, LIC10666, LIC10498 e LIC10463) foram eficientemente expressos em sistema de expressão heteróloga em Escherichia coli e purificados através de cromatografia de afinidade. Duas proteínas recombinantes, rLIC11889 e rLIC10666 foram empregados na formulação de preparações vacinais, utilizadas para imunizar hamsters posteriormente desafiados com dose letal de L. interrogans sorovar Copenhageni cepa Fiocruz L1-130. Todos os animais vacinados com as preparações contendo as proteínas recombinantes sobreviveram à leptospirose aguda, tornando promissora sua utilização para a criação de vacinas contra a doença. / Leptospirosis is a worldwide zoonosis caused by pathogenic members of the genus Leptospira. In countries under development, like Brazil, the disease represents a serious problem of public health. The susceptible hosts acquire the disease through contact with urine, water or soil contaminated with the bacteria. As well as rodents, cattle and dogs are important reservoirs of Leptospira spp, making the vaccination of susceptible animals one of the main. ways of preventing the disease. The commercially available vaccines are bacterins that induce humoral immune response predominantly against the bacterial lipopolysaccharide (LPS) and are unable to provide long term protection against the infection. The outer membrane proteins of Leptospira spp have been evaluated as vaccinal candidates in animal models and are a promising alternative to usual commercial formulae. In this way, the objective of this study was to perform a trial of vaccinal preparations containing recombinant proteins of Leptospira spp, to develop a vaccine against leptospirosis. Five genes, LIC11889, LIC10666, LIC10498, LIC12666 and LIC10463 were identified and amplified from the genome of Leptospira interrogans serovar Copenhageni strain Fiocruz L1-130. From these genes, four (LIC11889, LIC10666, LIC10498 and LIC10463) were efficiently expressed in an heterologous expression system in Escherichia coli and purified through affinity chromatography. Two recombinant proteins, rLIC11889 and rLIC10666 were employed in the formulation of vaccinal preparations, used to immunize hamsters that were later challenged with the lethal dose of L. interrogans serovar Copenhageni strain Fiocruz L1-130. All the animals vaccinated with the preparations containing the recombinant proteins survived acute leptospirosis, making their use for the development of vaccines against the disease promising.