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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.
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Análise da resposta imune celular de pacientes com tuberculose pulmonar ativa contra os antígenos recombinantes MPT-51, GLcB, ESAT-6, Ag 85A e a proteína do filtrado de cultura (CFP) de mycobacterium tuberculosis / Análise da resposta imune celular de pacientes com tuberculose pulmonar ativa contra os antígenos recombinantes MPT-51, GLcB, ESAT-6, Ag 85A e a proteína do filtrado de cultura (CFP) de mycobacterium tuberculosis / Analysis of Cellular Immune Response Against MPT-51, GLcB, ESAT-6, Ag 85A Recombinant Antigens and the Culture Filtered Protein (CFP) from Mycobacterium tuberculosis from Patients with Active Pulmonary Tuberculosis / Analysis of Cellular Immune Response Against MPT-51, GLcB, ESAT-6, Ag 85A Recombinant Antigens and the Culture Filtered Protein (CFP) from Mycobacterium tuberculosis from Patients with Active Pulmonary Tuberculosis

VASCONCELOS JUNIOR, Arioldo Carvalho 21 February 2008 (has links)
Made available in DSpace on 2014-07-29T15:30:39Z (GMT). No. of bitstreams: 1 Dissetacao Arioldo Vasconcelos Junior.pdf: 3999475 bytes, checksum: fcfb183b016528e836128fc94bae53f7 (MD5) Previous issue date: 2008-02-21 / This work characterized the specific cellular immune response of TCD4 and TCD8 lymphocytes against recombinant Mycobacterium tuberculosis at the Hospital Anuar Auad, Goiania Brazil, and constituted of two experimental groups: 1) 22 active TB patients with positive acid fast aputum, X-ray indicative of tuberculosis, smear culture positive for M. tuberculosis and HIV negative. 2) 15 sex and age matched healthy controls, tuberculin skin test and HIV negative. Venous blood was drawn and processed to obtain PBMC that were cultivated for 96 hours with the specific antigens (1mg/106 cells). TCD8 and TCD4 cells were analyzed by flow citometry for IL-10 and IFN-g production. In general, the percentage of positive TCD4 and TCD8 cells for IFN-g and IL-10 were superior among the TB patients. Additionally, TCD4+IFNg+ (5,63±2,43) and IL-10+ (5,83± 2,19) cells were significantly higher in TB patients than in healthy controls (TCD4+IFNg+ =1,75±0,71 and IL-10+ =1,47±0,90), (p<0,01). Regarding the percentage of TCD8 cells, a higher percentage of IFNg+ (4,33±1,45) and IL-10+ (4,01±1,14) among TB patients than controls (TCD8+IFNg+ = 1,49±0,42 and IL- 10+ 1,62±0,59) was observed (p<0,01). TB treatment did not alter the response to the tested antigens immediately after the treatment initiation. In conclusion, the recombinant antigens MPT-51, ESAT-6, GLcB, Ag85A were recognized by the specific immune response of active TB patients. Key words: Tuberculosis, Mycobacterium tuberculosis, Recombinant antigens, Cellular immune response. to the tested antigens immediately after the treatment initiation. In conclusion, the recombinant antigens MPT-51, ESAT-6, GLcB, Ag85A were recognized by the specific immune response of active TB patients. / Este trabalho avaliou a resposta imune celular dos linfócitos TCD4 e TCD8 de pacientes com tuberculose pulmonar ativa antes e após o tratamento, contra os antígenos recombinantes MPT-51, ESAT-6, GLcB, Ag85A e o Filtrado Protéico de Cultura (CFP) de Mycobacterium tuberculosis atendidos no Hospital de Doenças Tropicais Anuar Auad. A população de estudo, composta de 37 indivíduos, foi dividida em dois grupos experimentais. 1) 22 pacientes com tuberculose pulmonar, selecionados de acordo com idade, diagnóstico confirmado por baciloscopia (BAAR), radiografia evidente de tuberculose, HIV1/2 negativos. 2) 15 controles saudáveis negativos para prova tuberculinica (PT) e HIV1/2, pareados por faixa etária e sexo aos pacientes selecionados. Coletou-se aproximadamente 20 ml de sangue com heparina. O sangue total foi processado e cultivado por 96 horas na presença dos antígenos recombinantes e os linfócitos TCD4 e TCD8 foram analisados quanto à positividade para as citocinas IL-10 e IFN-g por citometria de fluxo. As porcentagens de linfócitos responsivos aos diversos antígenos de M. tuberculosis apresentaram-se em geral superiores aos controles. A porcentagem dos linfócitos TCD4+IFNg+ (5,63±2,43) e IL-10+ (5,83±2,19) foram maiores em pacientes com tuberculose pulmonar ativa em comparação com os linfócitos TCD4+IFNg+ (1,75±0,71) e IL-10+ (1,47±0,90) dos controles (p<0,01). Também, as porcentagens dos linfócitos TCD8+IFNg+ (4,33±1,45) e IL-10+ (4,01 ±1,14) dos pacientes foram maiores que os linfócitos TCD8+IFNg+ (1,49±0,42) e IL-10+ (1,62±0,59) dos controles (p<0,01). Não houve diferença significativa antes (5,63±2,43) e após (5,0±2,0) o tratamento nas populações celulares TCD4+ e TCD8+ positivas para IFN-g e IL-10 quando estimuladas com o painel de antígenos (p>0,05). Com estes resultados podemos considerar que todos os antígenos testados (MPT-51, ESAT-6, GLcB, Ag85A) são reconhecidos pelos linfócitos TCD4+ e TCD8+ de pacientes com tuberculose pulmonar ativa.
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Aspectos da resposta imune humoral e celular de bovinos naturalmente infectados com mycobacterium bovis e avaliação de vacina de subunidade protéica para tuberculose em camundongos / Cellular and humoral immune response aspects of tuberculosis cattle naturally infected with Mycobacterium bovis and evaluation of a proteic subunit tuberculosis vaccine in mice

SILVA, Ediane Batista da 05 August 2008 (has links)
Made available in DSpace on 2014-07-29T15:13:53Z (GMT). No. of bitstreams: 1 TeseEdiane_Batista.pdf: 714564 bytes, checksum: 03efd3ac163525d9d401336bdd75356e (MD5) Previous issue date: 2008-08-05 / Several aspects of the bovine tuberculosis were analyzed in this study. The immunogenicity of recombinant MPT-51 (rMPT-51), Ag-85 and M. bovis-BCG were characterized in an immunosorbent assay, where 208 serum samples from positive intradermal tuberculin test (ITT) animals and 54 serum samples from ITT negative animals where analyzed. M. bovis-BCG and Ag-85 were strongly recognized by antibodies from naturally infected cattle. Additionally, the clinical status of the animals were correlated with the ITT positivity, with the specific production of IL-4 by TCD4 and TCD8 positive lymphocytes, and with nitric oxide (NO) production by macrophages from naturally tuberculosis infected bovine peripheral blood. ITT positive animals showed TCD4+IL4+ cells specific to M. bovis-BCG extract. High background levels of TCD8+IL-4+ lymphocytes were observed in ITT positive animals independent of the stimuli. When cell cultures where stimulated with M. bovis-BCG protein extract, there was no observed difference in NO production between the groups. Naturally tuberculosis infected bovine presented TCD4+IL4+ cells specific for M. bovis- BCG and a preserved NO production. Finnally, the immunogenicity of rMPT-51 use as a proteic sub-unit vaccine was evaluated in BALB/c mice, with two different adjuvants, incomplete Freund and CpG DNA. For this, mice were immunized and challenged with M. tuberculosis. Immunization with rMPT-51 antigen and either adjuvant induced, in the lungs, a migration increase of TCD5+IFN + cells specific for rMPT-51, when compared to controls (P<0.05). rMPT-51 plus CpG DNA presented a better performance among the different vaccination schemes tested, in part due to the ability of stiulate TCD5+IFN + cells and hampering the bacterial load, thus preserving the functional integrity of challenged mice lungs / Nesta tese foram avaliados vários aspectos da tuberculose bovina e do Mycobacterium bovis. Primeiro caracterizou-se a imunogenicidade do MPT-51, Ag 85 e BCG em ensaio imunoenzimático, onde foram utilizadas 208 amostras de soro de animais TTI positivo e 54 amostras de bovinos negativos. O BCG-M. bovis e o Ag 85 foram fortemente reconhecidos pelos anticorpos dos bovinos naturalmente infectados. Segundo correlaciounou-se o estado clínico do animal à positividade ao teste intradérmico, com a produção específica de IL-4 por linfócitos TCD4+ e TCD8+ e a produção de óxido nítrico por macrófagos do sangue periférico de bovinos naturalmente infectados com tuberculose. Foi observado que os bovinos TTI positivos apresentaram células CD4+IL-4+ específicas para extrato protéico de M. bovis-BCG. Observaram-se altos níveis basais de linfócitos TCD8+IL-4+ independente de estímulos nos animais reatores. Quando as culturas foram estimuladas com extrato protéico de BCG, não houve diferença quanto à produção de NO. Os bovinos tuberculosos, naturalmente infectados, apresentaram células TCD4+IL4+ específicas para M. bovis-BCG, preservando a produção de NO pelos macrófagos. Finalmente, a imunogenicidade do MPT-51 como vacina de sub-unidade protéica foi avaliada em camundongos BALB/c, testando o MPT-51 com dois adjuvantes, o incompleto de Freund e o CpG DNA. Os camundongos foram imunizados e posteriormente desafiados com M. tuberculosis. No pulmão, a imunização com antígeno rMPT-51 a 20&#956;g/ml + adjuvantes de Freund Incompleto e CpG DNA induziu aumento da migração de células TCD5+IFN- + específicas para o MPT-51 para o local da infecção, quando comparados com o controle (p<0,05). O MPT-51+CpG DNA, apresentou melhor desempenho dentre os esquemas de vacinação adotados, devido a capacidade de estimular a produção de células TCD5+IFN- + e a diminuição da carga bacteriana, preservando assim a integridade funcional do pulmão dos camundongos, quando desafiados

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