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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

Estudo bio-molecular de três estoques mistos de trypanosoma cruzi-leishmania spp isolados de pacientes chagásicos crônicos após terapêutica específica para a doença de chagas / Bio-molecularstudy of three stocks mixed Trypanosoma cruzi-Leishmania spp isolated from chronic chagasic patients after specific therapy for Chagas desease

Dias, Sueli Meira da Silva 28 June 2006 (has links)
Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2014-10-02T20:53:47Z No. of bitstreams: 2 Dissertação - Sueli Meira da Silva Dias - 2006.pdf: 822890 bytes, checksum: 1982b1c5fbad1e0a077fcf7876d69f21 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2014-10-02T21:07:22Z (GMT) No. of bitstreams: 2 Dissertação - Sueli Meira da Silva Dias - 2006.pdf: 822890 bytes, checksum: 1982b1c5fbad1e0a077fcf7876d69f21 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-10-02T21:07:22Z (GMT). No. of bitstreams: 2 Dissertação - Sueli Meira da Silva Dias - 2006.pdf: 822890 bytes, checksum: 1982b1c5fbad1e0a077fcf7876d69f21 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2006-06-28 / Thirty cronic chagasic pacients were submitted to specific treatment against Chaga’s disease. The drug of choice was Benznidazole. After treatment laboratorial exams such as parasitological and imunological aiming terapheutic validation were performed. The parasitological analysis is represented by post-treatment hemoculture of 30 cronic chagasic pacients and demonstrated the presence of promastigotes and epimastigotes in 10% (3/30) of pacients, probably characterizing a mixed infection. These hemocultures were named 371, 437 and 438. From these three pacients two were from Goias (GO) and one from Minas Gerais (MG) which are endemic regions to Chaga’s disease as well as to Leishmaniasis which justified the study of this probable co-infection. The work was developed in two phases: in the first phase it was made the biological experimental study of the mixed sotck and in the second phase it was made the confirmation of the Leishmania spp gender through PCR technique. In the experimental biological study the model used was Balb/c isogenic mice and we made an intraperitoneal inoculation of the stocks and we analysed the following parameters: parasitism, hemoculture, sorology by IFI and histopathology. The parasitism observation occured between 48 hours periods through 90 days, and the hemoculture observations occured weekly through 120 days and resulted positive only in mice innoculated with stock 371. The sorology showed anti-T. cruzi antibodies titers in mice innoculated with stocks 371 and 437. The histopathology revealed the presence of amastigotes in tissues cardiac slides from mice innoculated with stock 438, showing that only the epimastigotes forms are present in the mixed stocks and are viable to infect the experimental model used in this work. The confirmation of the Leishmania subgenus envolved in this co-infection was possible through molecular biology techniques. In PCRRFLP, after digestion of PCR products by Hae III restriction enzymes which has specific clivage sites for L. (Viannia) subgender. The samples represented by 371, 437 and 438 stocks and the controls of L. (L.) amazonensis and L. (L.) chagasi did not suffer clivage of its amplified segments in PCR. Only the control constituted by L. (V.) braziliensis suffered clivage resulting in fragments of aproximately 40 and 80 bp confirming undoubtfully that the samples represented by the mixed stocks 371, 437 and 438 isolated from cronic chagasic pacients cantained L. (Leishmania) spp. / Trinta pacientes chagásicos crônicos foram submetidos ao tratamento específico para a doença de Chagas. A droga utilizada foi o Benznidazol. Após o tratamento foram realizados exames laboratoriais compreendendo análises parasitológicas e imunológicas, com a finalidade de validação terapêutica. A análise parasitológica representada pela hemocultura evidenciou a presença concomitante de promastigotas e epimastigotas em 10% (3/30) delas, caracterizando uma provável infecção mista. Essas hemoculturas foram denominadas 371, 437 e 438. Dos três pacientes, dois são procedentes do estado de Goiás (GO) e um do estado de Minas Gerais (MG), regiões endêmicas tanto para a doença de Chagas como para a leishmaniose, o que justificou o estudo desta provável co-infecção. O presente trabalho foi desenvolvido em duas etapas. Na primeira etapa, foi realizado o estudo biológico experimental dos estoques mistos e na segunda, a confirmação do gênero Leishmania spp nos estoques mistos, através da técnica de PCR. No estudo biológico experimental, foram utilizados como modelos camundongos Balb/c isogênicos, realizando-se inoculação intraperitoneal dos estoques. Posteriormente foi analisada a parasitemia, hemocultura, sorologia por IFI e histopatologia. A observação da parasitemia ocorreu a cada 48 horas pelo período de 90 dias, e a hemocultura foi analisada semanalmente por 120 dias, resultando positiva apenas nos camundongos inoculados com o estoque 371. A IFI detectou apenas anticorpos anti-T. cruzi, nos camundongos inoculados com os estoques 371 e 437. A análise histopatológica revelou presença de ninhos de amastigotas nos cortes cardíacos dos camundongos inoculados com o estoque 437, demonstrando no conjunto dessas análises, que apenas as formas epimastigotas presentes nos estoques mistos se mostraram viáveis em infectar o modelo experimental utilizado. A presença de protozoários do gênero Leishmania nos estoques foi confirmada mediante realização de PCR. Na PCR-RFLP, o produto da amplificação foi tratado com a enzima de restrição Hae III que tem sítios específicos de clivagem para o subgênero L. (Viannia). As amostras representadas pelos estoques 371, 437 e 438 e os controles de L. (L.) amazonensis e L. (L.) chagasi não sofreram clivagem de seus segmentos amplificados na PCR. Apenas o controle constituído de L. (V.) braziliensis sofreu clivagem, resultando fragmentos de aproximadamente 40 e 80 pb, confirmando inequivocamente que as amostras representadas pelos estoques mistos 371, 437 e 438 isoladas de pacientes chagásicos crônicos realmente continham L. (Leishmania) spp.

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