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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

T-lymphocyte mediated killing af TAP-deficient tumor cells and immunodominance of minor histocompatibility antigens /

Wolpert, Elisabeth Z., January 1900 (has links)
Diss. (sammanfattning) Stockholm : Karol. inst. / Härtill 5 uppsatser.
2

The differential induction of HLA class I by interferon-#alpha#

Isamat, Marcos January 1992 (has links)
No description available.
3

Identification and characterization of peptide surrogates of a major carbohydrate antigen in trichinella spiralis. / CUHK electronic theses & dissertations collection

January 2000 (has links)
by Tam Chi Hang, Frankie. / "August 2000." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (p. 162-174). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
4

Streptococcal mAb10F5 interacts with synaptic vesicles due to antiphospholipod activity

Ghassemifar, Sara January 2008 (has links)
Hypermetabolism, observed in Sydenham's chorea (SC); a complication of acute rheumatoid fever (ARF) involving binding of streptococcal M protein antibodies in the brain, may result from an increase in glutamate release. The interaction of mAb 1 OF5, a specific M protein antibody subtype, with brain proteins (e.g. Rabphilin-3A), synaptic vesicles (SVs) and synaptosomal fraction (SF) was examined. Rat brain slices immunostained with mAb l OF5 revealed an interaction with choroid plexus and elements appearing to be neuropils. Dot blotting demonstrated an interaction of mAb I OF5 with both SVs and SFs. Western blotting revealed a smear from mAb 10F5 against the SF fraction. However, both modified SVs and pure liposomes examined by fluorescent and confocal microscopy bound mAbl0F5 suggesting a direct interaction with phospholipids. ELISA demonstrated binding of mAb1OF5 with negatively charged phospholipids involved in antiphospholipid syndrome (APS). Hypermetabolism and binding at the choroid plexus is observed in SC and APS supporting the connection between these disorders. / Department of Physiology and Health Science
5

Characterization of a T lymphocyte-derived, antigen-binding molecule with suppressive activity

Chu, Nelson Randall January 1989 (has links)
Regulation of the immune response is mediated, in part, by the action of suppressor T cells (Ts). One intriguing aspect of these cells is the description of T cell suppressor factor (TsF): a soluble analog of the cell that shares many of its properties, such as the ability to bind free antigen (Ag) and suppress an Ag-specific immune response. The exact molecular nature of TsF and the relationship of TsF to Ts are unknown. The immune response to the small, bacterial protein, ferredoxin (Fd), was used as a model system to study TsF. A Fd-specific suppressor cell network has been described in mice that are genetically nonresponsive to this Ag. Previously, a soluble mediator, known as Fd11F, was found in the culture supernatant (SN) of the Ts hybridoma, Fd11. Fd11F possessed both Ag-binding activity and the ability to suppress the anti-Fd Ab response in mice. The TsF-specific monoclonal antibody, B16G, was used for both the recovery of Fd11F-enriched material from SN and its detection by the enzyme-linked immunosorbent assay. ' Further immunochemical, biological, and biochemical characterization of Fd11F was done with emphasis on describing the Ag-binding properties of Fd11F. It was found that Fd11F bound to solid- and liquid-phase Fd, and demonstrated preferential binding to the carrier determinant of the Ag. A spleen cell culture assay was devised which showed that Fd11F suppressed Ab production in a concentration-dependent manner. Additional experiments suggested that the suppressive effect was Ag-specific. The identification of the Ag-binding molecule was attempted by the fractionation of Fd11F-enriched material using high performance gel filtration or preparative SDS-PAGE (run under non-reducing conditions). Using SDS-PAGE, a unique, single polypeptide of about 30k relative molecular mass (Mr) was identified as the Ag-binding moiety of Fd11F. The possible relationship of this moiety to other identified materials is discussed. / Science, Faculty of / Microbiology and Immunology, Department of / Graduate
6

Human leukocyte antigen supertypes in relation to human imunodeficiency virus infection among populations of African ancestry

Lazaryan, Aleksandr. January 2008 (has links) (PDF)
Thesis (Ph.D.)--University of Alabama at Birmingham, 2008. / Title from PDF title page (viewed on Sept. 17, 2009). Includes bibliographical references.
7

Efeito da sílica nanoestruturada SBA-15 na apresentação antigênica e na resposta imune. / Effect of nanostructured silica SBA-15 in antigen presentation and immune response.

Carvalho, Luciana Vieira 29 November 2010 (has links)
A sílica SBA-15 devido às suas propriedades físico-química e estrutural tem demonstrado efeito adjuvante, carreando, protegendo e liberando antígenos. Nesse estudo avaliou-se o seu efeito sobre a atividade fagocítica de macrófagos; no recrutamento de células para órgãos linfóides; na expressão de moléculas MHC de classe II e co-estimuladoras pelas APCs; e a influência do tempo de contato imunógeno:SBA15 no potencial de adsorção e geração de anticorpos. Experimentos in vitro evidenciam que diferentes concentrações da SBA-15 não afetam a morfologia ou atividade de macrófagos. A SBA15 induz o recrutamento de macrófagos, células dendríticas, CD4+, CD8+ e B220+ para os linfonodos drenantes, promovendo aumento de expressão de moléculas co-estimuladoras. As análises da produção de anticorpos demonstram que o contato imunógeno:sílica é importante na adsorção e melhora da resposta imune. Esses resultados sugerem que o potencial adjuvante da SBA-15 relaciona-se com a capacidade de adsorver antígenos e liberá-los às APCs, influindo diretamente na reposta imunológica. / The SBA-15 silica is a polymer that due to its physico-chemical and structural properties has shown adjuvant effect, carrying, protecting and delivering antigens. In this study was evaluated the effect of SBA15 in the phagocytic activity of macrophages; recruitment of cells to lymphoid organs; expression of MHC class II and co-stimulatory molecules by the APCs, and the influence of contact time between immunogen:SBA-15 in potential for absorption and generation of antibodies. In vitro experiments showed that different concentrations of SBA-15 do not affect the morphology or macrophage activity. SBA-15 induces the recruitment of macrophages, dendritic cells, CD4+, CD8+ and B220+ to the draining lymph nodes, increasing the expression of co-stimulatory molecules. Analyses of antibody production showed that the contact immunogen:silica is important for adsorption and improves the immune response. These results suggest that the adjuvanticity of SBA-15 is related to its ability in antigens adsorption and release to APCs, directly influencing the immune response.
8

Desenvolvimento de vacina terapêutica contra HPV16 / Development of a therapeutic vaccine against HPV16

Morale, Mirian Galliote 24 February 2010 (has links)
O câncer cervical é o segundo câncer mais comum entre mulheres no mundo. A maioria dos casos (83%) ocorre em países em desenvolvimento, onde são encontrados em estágios relativamente avançados e, conseqüentemente, a sobrevida média é de cerca de 49% após cinco anos. Portanto, uma vacina eficaz contra as infecções pelo HPV pode levar ao controle do câncer do colo do útero. Apesar de prevenir, a vacina profilática não é acessível em função do alto custo, além de não eliminar o vírus em mulheres já infectadas pelo HPV. Assim, propusemos o desenvolvimento de uma vacina terapêutica eficaz utilizando duas abordagens: VLPs (virus-like particles) quiméricas, que poderiam apresentar propriedades profiláticas e terapêuticas, obtidas da fusão das proteína L1 e E7; proteínas quiméricas obtidas a partir da fusão de epítopos das proteínas E6 e E7 do HPV16, com e sem ubiquitina. Após subclonagens, com a obtenção dos vetores pPICHOLI-L1ΔCE71-50 e pPICHOLI-L1ΔCE743-77, partiu-se para a indução da expressão das VLPs quiméricas em Pichia pastoris, das quais não foram detectadas expressão protéica. Realizaram-se inúmeras modificações no protocolo de indução. Mesmo após essas alterações não foi detectada nenhuma expressão das fusões L1ΔCE71-50 ou L1ΔCE743-77. Como alternativa de uma vacina terapêutica, nos propusemos a expressar em E. coli proteínas sintéticas originadas da fusão entre epítopos das proteínas E6 e E7 do HPV16, com ou sem Ubiquitina, visando aumentar a apresentação de peptídeos via MHC de classe I de modo a estimular a eliminação de células infectadas com HPV16, evitando e regredindo o desenvolvimento dessas células cancerosas. Com a proteína E6E7 solúvel e purificada, realizou-se um ensaio de imunização. Nesse experimento, 20% dos animais imunizados com a proteína E6E7 não apresentaram desenvolvimento de tumor após a inoculação de células TC1. Assim isso nos leva a crer que com o aumento da concentração de proteína e utilização de adjuvantes seria possível aumentar o número de animais resistentes ao desenvolvimento do tumor. Em um segundo experimento de imunização, comparamos as proteínas E6E7 e E6E7Ub, em duas concentrações, 15 e 40 µg, e também com ou sem o adjuvante whole cell pertussis (WCP). Independentemente da concentração e presença ou ausência de WCP, os grupos imunizados com E6E7Ub apresentaram proteção contra o tumor entre 80% e 100% dos camundongos, enquanto os grupos imunizados com E6E7 apresentaram proteção entre 0% e 25%. Esses resultados são promissores, ainda que preliminares, indicando um potencial de uso da proteína E6E7Ub como imunógeno para vacina terapêutica contra o câncer cervical induzido por HPV16 / Cervical cancer is the second most common cancer among women worldwide. Most cases (83%) occur in developing countries, where they are found in relatively advanced stages and, consequently, the median survival is about 49% after five years. Therefore, an effective vaccine against HPV infections can lead to control of cancer of the cervix. Although preventable, the prophylactic HPV vaccine is not accessible to all due to their high cost and in addition the vaccine does not eliminate the HPV in infected women. We have therefore proposed the development of effective therapeutic vaccines using two approaches: chimeric VLPs (virus-like particles), endowed with prophylactic and therapeutic properties, obtained from the fusion protein L1 and E7; chimeric proteins derived from the fusion of epitopes of proteins E6 and E7 of HPV16 with and without ubiquitin. After subcloning, we obtained the vectors pPICHOLI-L1ΔCE71-50 and L1 pPICHOLI- L1ΔCE743-77. After transformation of yeast Pichia pastoris with these constructions, the cells were induced, but it was not possible to detect any recombinant protein expression. As an alternative, we proposed the expression of synthetic proteins in E. coli derived from the fusion between epitopes of E6 and E7 proteins of HPV16 with or without Ubiquitin, in order to enhance the presentation of peptides through MHC class I to stimulate the elimination of HPV16-infected cells, preventing and regressing the development of cancer cells. Soluble E6E7 protein was purified and, 20% of the animals immunized with this protein did not develop tumor after inoculation of TC1 cells. In a second immunization experiment we compared the proteins E6E7 and E6E7Ub, in two concentrations, 15 and 40µg, with or without the adjuvant whole cell pertussis (WCP). Regardless of concentration and presence or absence of WCP, all the groups immunized with E6E7Ub showed protection against tumor between 80% and 100%, while the groups immunized with E6E7 showed protection from 0% to 25%. These results are promising and although preliminary, indicate the potential of E6E7Ub protein as an immunogen, for a therapeutic vaccine against cervical cancer induced by HPV16
9

Desenvolvimento de vacina terapêutica contra HPV16 / Development of a therapeutic vaccine against HPV16

Mirian Galliote Morale 24 February 2010 (has links)
O câncer cervical é o segundo câncer mais comum entre mulheres no mundo. A maioria dos casos (83%) ocorre em países em desenvolvimento, onde são encontrados em estágios relativamente avançados e, conseqüentemente, a sobrevida média é de cerca de 49% após cinco anos. Portanto, uma vacina eficaz contra as infecções pelo HPV pode levar ao controle do câncer do colo do útero. Apesar de prevenir, a vacina profilática não é acessível em função do alto custo, além de não eliminar o vírus em mulheres já infectadas pelo HPV. Assim, propusemos o desenvolvimento de uma vacina terapêutica eficaz utilizando duas abordagens: VLPs (virus-like particles) quiméricas, que poderiam apresentar propriedades profiláticas e terapêuticas, obtidas da fusão das proteína L1 e E7; proteínas quiméricas obtidas a partir da fusão de epítopos das proteínas E6 e E7 do HPV16, com e sem ubiquitina. Após subclonagens, com a obtenção dos vetores pPICHOLI-L1ΔCE71-50 e pPICHOLI-L1ΔCE743-77, partiu-se para a indução da expressão das VLPs quiméricas em Pichia pastoris, das quais não foram detectadas expressão protéica. Realizaram-se inúmeras modificações no protocolo de indução. Mesmo após essas alterações não foi detectada nenhuma expressão das fusões L1ΔCE71-50 ou L1ΔCE743-77. Como alternativa de uma vacina terapêutica, nos propusemos a expressar em E. coli proteínas sintéticas originadas da fusão entre epítopos das proteínas E6 e E7 do HPV16, com ou sem Ubiquitina, visando aumentar a apresentação de peptídeos via MHC de classe I de modo a estimular a eliminação de células infectadas com HPV16, evitando e regredindo o desenvolvimento dessas células cancerosas. Com a proteína E6E7 solúvel e purificada, realizou-se um ensaio de imunização. Nesse experimento, 20% dos animais imunizados com a proteína E6E7 não apresentaram desenvolvimento de tumor após a inoculação de células TC1. Assim isso nos leva a crer que com o aumento da concentração de proteína e utilização de adjuvantes seria possível aumentar o número de animais resistentes ao desenvolvimento do tumor. Em um segundo experimento de imunização, comparamos as proteínas E6E7 e E6E7Ub, em duas concentrações, 15 e 40 µg, e também com ou sem o adjuvante whole cell pertussis (WCP). Independentemente da concentração e presença ou ausência de WCP, os grupos imunizados com E6E7Ub apresentaram proteção contra o tumor entre 80% e 100% dos camundongos, enquanto os grupos imunizados com E6E7 apresentaram proteção entre 0% e 25%. Esses resultados são promissores, ainda que preliminares, indicando um potencial de uso da proteína E6E7Ub como imunógeno para vacina terapêutica contra o câncer cervical induzido por HPV16 / Cervical cancer is the second most common cancer among women worldwide. Most cases (83%) occur in developing countries, where they are found in relatively advanced stages and, consequently, the median survival is about 49% after five years. Therefore, an effective vaccine against HPV infections can lead to control of cancer of the cervix. Although preventable, the prophylactic HPV vaccine is not accessible to all due to their high cost and in addition the vaccine does not eliminate the HPV in infected women. We have therefore proposed the development of effective therapeutic vaccines using two approaches: chimeric VLPs (virus-like particles), endowed with prophylactic and therapeutic properties, obtained from the fusion protein L1 and E7; chimeric proteins derived from the fusion of epitopes of proteins E6 and E7 of HPV16 with and without ubiquitin. After subcloning, we obtained the vectors pPICHOLI-L1ΔCE71-50 and L1 pPICHOLI- L1ΔCE743-77. After transformation of yeast Pichia pastoris with these constructions, the cells were induced, but it was not possible to detect any recombinant protein expression. As an alternative, we proposed the expression of synthetic proteins in E. coli derived from the fusion between epitopes of E6 and E7 proteins of HPV16 with or without Ubiquitin, in order to enhance the presentation of peptides through MHC class I to stimulate the elimination of HPV16-infected cells, preventing and regressing the development of cancer cells. Soluble E6E7 protein was purified and, 20% of the animals immunized with this protein did not develop tumor after inoculation of TC1 cells. In a second immunization experiment we compared the proteins E6E7 and E6E7Ub, in two concentrations, 15 and 40µg, with or without the adjuvant whole cell pertussis (WCP). Regardless of concentration and presence or absence of WCP, all the groups immunized with E6E7Ub showed protection against tumor between 80% and 100%, while the groups immunized with E6E7 showed protection from 0% to 25%. These results are promising and although preliminary, indicate the potential of E6E7Ub protein as an immunogen, for a therapeutic vaccine against cervical cancer induced by HPV16
10

Efeito da sílica nanoestruturada SBA-15 na apresentação antigênica e na resposta imune. / Effect of nanostructured silica SBA-15 in antigen presentation and immune response.

Luciana Vieira Carvalho 29 November 2010 (has links)
A sílica SBA-15 devido às suas propriedades físico-química e estrutural tem demonstrado efeito adjuvante, carreando, protegendo e liberando antígenos. Nesse estudo avaliou-se o seu efeito sobre a atividade fagocítica de macrófagos; no recrutamento de células para órgãos linfóides; na expressão de moléculas MHC de classe II e co-estimuladoras pelas APCs; e a influência do tempo de contato imunógeno:SBA15 no potencial de adsorção e geração de anticorpos. Experimentos in vitro evidenciam que diferentes concentrações da SBA-15 não afetam a morfologia ou atividade de macrófagos. A SBA15 induz o recrutamento de macrófagos, células dendríticas, CD4+, CD8+ e B220+ para os linfonodos drenantes, promovendo aumento de expressão de moléculas co-estimuladoras. As análises da produção de anticorpos demonstram que o contato imunógeno:sílica é importante na adsorção e melhora da resposta imune. Esses resultados sugerem que o potencial adjuvante da SBA-15 relaciona-se com a capacidade de adsorver antígenos e liberá-los às APCs, influindo diretamente na reposta imunológica. / The SBA-15 silica is a polymer that due to its physico-chemical and structural properties has shown adjuvant effect, carrying, protecting and delivering antigens. In this study was evaluated the effect of SBA15 in the phagocytic activity of macrophages; recruitment of cells to lymphoid organs; expression of MHC class II and co-stimulatory molecules by the APCs, and the influence of contact time between immunogen:SBA-15 in potential for absorption and generation of antibodies. In vitro experiments showed that different concentrations of SBA-15 do not affect the morphology or macrophage activity. SBA-15 induces the recruitment of macrophages, dendritic cells, CD4+, CD8+ and B220+ to the draining lymph nodes, increasing the expression of co-stimulatory molecules. Analyses of antibody production showed that the contact immunogen:silica is important for adsorption and improves the immune response. These results suggest that the adjuvanticity of SBA-15 is related to its ability in antigens adsorption and release to APCs, directly influencing the immune response.

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