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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

Phenotypic and functional characteristics of T-lymphocytes during the course of infection with leishmania major

Southern, Kristina L. January 1995 (has links)
If used early in infection, prophylactic treatment with the immunomodulatory drug cyclosporin A of Leishmania ma'or infected Balb/c mice has been shown to enhance resistance of these mice to serious disease. It is thought that CsA treatment affects disease progression by altering the balance of specific T lymphocyte populations as well as the secretion of various cytokines. We have followed the levels of L3T4+ T cells, Ly-2+ T cells, and total T and B lymphocytes, as well as IL-4 in susceptible Balb/c mice, CsA-treated Balb/c mice, and naturally resistant C57B1/6 mice during the course of L. ma'or infection. The CsA-treated mice displayed a disease pattern similar to that of the C57B1/6 group throughout infection. Most importantly, CsA treatment appeared to inhibit IL-4 production early post infection in both spleen and lymph node, and also appeared to inhibit the dramatic early increase of L3T4+ (CD4+) T cells which is characteristic of the susceptible Balb/c mice. / Department of Biology
2

Avaliação da atividade anti-leishmania induzida por complexos metálicos de cobre

Chagas, Ana Flávia da Silva 10 September 2015 (has links)
Submitted by Izabel Monteiro (izabel_22@hotmail.com) on 2016-08-03T14:05:25Z No. of bitstreams: 1 Dissertação - Ana Flávia Chagas.pdf: 2651636 bytes, checksum: 31f422b87baf13b0e63decdbaeb0d66e (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-08-17T15:30:32Z (GMT) No. of bitstreams: 1 Dissertação - Ana Flávia Chagas.pdf: 2651636 bytes, checksum: 31f422b87baf13b0e63decdbaeb0d66e (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-08-17T15:34:29Z (GMT) No. of bitstreams: 1 Dissertação - Ana Flávia Chagas.pdf: 2651636 bytes, checksum: 31f422b87baf13b0e63decdbaeb0d66e (MD5) / Made available in DSpace on 2016-08-17T15:34:29Z (GMT). No. of bitstreams: 1 Dissertação - Ana Flávia Chagas.pdf: 2651636 bytes, checksum: 31f422b87baf13b0e63decdbaeb0d66e (MD5) Previous issue date: 2015-09-10 / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / The American Cutaneous Leishmaniasis is characterized as an infectious parasitic disease, not contagious, caused by parasites of the genus Leishmania, which has a heteroxenic life cycle, alternating between hosts invertebrates and vertebrates. Leishmaniasis is a neglected disease, affecting 98 countries, estimated 1.3 million new cases each year. Patients with American cutaneous leishmaniasis may present different clinical picture, namely: the cutaneous and mucocutaneous. The cutaneous form is the most frequent and widely distributed characterized by localized skin lesions, and can display a spontaneous healing above, depending on the host immune response and Leishmania species. The mucocutaneous form manifests as lesions in the mucosa, usually ulcerative and can produce disfiguring lesions. In Brazil leishmaniasis has become endemic, with notifications of cases of leishmaniasis in all states. The first-line drug used in Brazil is the pentavalent antimoniate N- methylglucamine ( Glucantime® ) and its management is done through daily injections. As second choice drugs are sodium stibogluconate (Pentostan®), pentamidine isethionate, amphotericin B, liposomal amphotericin B, miltefosine, among others. Although efficacy of these drugs usually present, some problems may be cited as the high toxicity which induces an array of side effects which often preclude treatment continuity and resistance of some species of Leishmania. In this context it is necessary to search for new compositions which have anti- Leishmania activity and low toxicity to the patient. Based on studies on the activity of metal complexes, especially with antitumor activity, we have seen the possibility of using such complexes for the treatment of cutaneous leishmaniasis. Studies have demonstrated the potential to cover the treatment of disorders showing promising activity antimicrobial, antitumor and anti- inflammatory. This study aimed to evaluate the leishmanicidal activity six copper complexes against promastigote forms and amastigote Leishmania (Leishmania) amazonensis and Leishmania ( Viannia) guyanensis , and the complexes [Cu(thp)4]PF6 and [Cu(PCN)(HBPz3] showed higher leishmanicidal activity, respectively. / A Leishmaniose Tegumentar Americana caracteriza-se como uma doença infecto-parasitária, não contagiosa, causada por parasitos do gênero Leishmania, que possui um ciclo de vida heteroxênico, alternando entre hospedeiros invertebrados e vertebrados. A leishmaniose é uma doença negligenciada e acomete 98 países, estimando 1,3 milhões de novos casos a cada ano. Os pacientes com Leishmaniose Tegumentar Americana podem apresentar quadro clínico diferenciado, sendo eles: a forma cutânea e mucocutânea. A forma cutânea é a mais frequente e mais amplamente distribuída, caracterizando-se por lesões localizadas na pele, podendo apresentar um quadro de cura espontânea, dependendo da resposta imune do hospedeiro e da espécie de Leishmania. A forma mucocutânea manifesta-se como lesões na mucosa, normalmente ulcerativas, podendo produzir lesões desfigurantes. No Brasil a leishmaniose apresenta-se endêmica, apresentando notificações de casos de leishmaniose em todos os estados. O medicamento de primeira escolha utilizado no Brasil é o antimoniato pentavalente de N-metilglucamina (Glucantime®) e sua administração é feita por meio de injeções diárias. Como drogas de segunda escolha estão estibogluconato de sódio (Pentostan®), isetionato de pentamidina, anfotericina B, anfotericina B lipossomal, miltefosina, entre outras. Apesar desses fármacos normalmente apresentarem eficácia, alguns problemas podem ser citados como a alta toxicidade que induz a uma gama de efeitos colaterais que muitas vezes impossibilitam a continuidade do tratamento e a resistência de algumas espécies de Leishmania. Nesse contexto faz-se necessário a busca por novas composições que apresentem atividade anti-Leishmania e com baixa toxicidade ao paciente. Com base em estudos sobre a atividade de complexos metálicos, principalmente com atividade antitumoral, tem-se visto a possibilidade de utilizar esses complexos para o tratamento de leishmaniose cutânea. Estudos tem demonstrado o potencial do cobre para o tratamento de patologias apresentando atividade promissora com ação antimicrobiana, antitumoral e anti-inflamatória. O presente trabalho teve como objetivo avaliar a atividade leishmanicida de seis complexos de cobre contra as formas promastigota e amastigota de Leishmania (Leishmania) amazonensis e Leishmania (Viannia) guyanensis, tendo os complexos [Cu(thp)4]PF6 e [Cu(PCN)(HBPz3] apresentado maior atividade leishmanicida, respectivamente.

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