• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • 1
  • Tagged with
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 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

Regulação do gene gata3 humano pelo virus HTLVI

Gilli, Simone Cristina Olenscki 19 July 2004 (has links)
Orientador: Sara T. O. Saad / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciencias Medicas / Made available in DSpace on 2018-08-03T23:31:08Z (GMT). No. of bitstreams: 1 Gilli_SimoneCristinaOlenscki_D.pdf: 6959338 bytes, checksum: 59270968defefa0da38289624c7c16a1 (MD5) Previous issue date: 2004 / Resumo: A infecção pelo vírus linfotrópico de células T tipo I (HTLV I) tem sido associada à leucemia/linfoma T do adulto (LLTA), à paraparesia espástica tropical! mielopatia associada ao HTLV I (PET/MAH), à uveíte e, recentemente, à Síndrome de Sjõgren e outras doenças do sistema conjuntivo. Os fatores que detenninam a evolução para essas doenças relacionadas à infecção são desconhecidos, mas podem estar ligados à predisposição genética e à resposta imune do hospedeiro. Camundongos com ausência do gene GATA3 demonstram várias e graves anormalidades morfológicas e fisiológicas no sistema nervoso central e periférico, além de comprometimento da hematopoese durante o desenvolvimento embrionário. Há, portanto, semelhanças entre os sistemas comprometidos na ausência do gene GATA3 e aqueles alterados secundariamente à infecção pelo HTLV I. Vários estudos sugerem que uma fosfoproteína viral presente no HTLVI, denominada Tax, ative a transcrição de vários genes envolvidos na produção de citocinas ou na resposta e na proliferação celular, como c-fos, c-myc, erg-I, IL-I, IL-2, GM-CSF. Entretanto, a crelação entre a infecção pelo vírus HTLV I e o fator de transcrição GATA3 ainda não havia sido determinada. Os objetivos do presente trabalho foram caracterizar a relação entre o fator de transcrição GATA3 e o vírus HTLV I, utilizando-se, para tanto, a técnica de RT-PCR semiquantitativo; analisar a relação entre o fator de transcrição GATA3 e o vírus HTLV I, por meio de estudos de interação DNA/proteína; e demonstrar, por estudos funcionais em modelos celulares in vitro, a resposta das regiões de controle transcricional do gene GATA3 à proteína Tax. Demonstramos, através do RT-PCR semi-quantitativo que ocorre uma evidente redução na expressão do gene GATA3 em portadores saudávies da infecção pelo HTLVI, e também de forma mais acentuada nos portadores de Leucemia Linfoma T do Adulto e Paraparesia Espástica Tropical/Mielopatia associada ao HTLVI. Estudos in vitro, que utilizaram construções com o gene reporter CAT direcionado pelo promotor e silenciador do gene GATA3 co-transfectados com vetores de expressão da proteína Tax e seu mutante, revelaram que Tax exerce atividade discreta no promotor de gene GATA3, mas reprime de modo marcante a atividade do promotor na presença de seu silenciador. Essa repressão provavelmente ocorre através da interação de tax com o fator de trans.crição ZEB, o silenciador do promotor do gene GATA3, uma vez que interação deste com a proteína Tax foi demonstrada no estudo de retardamento em gel. O estudo demonstrou, pela primeira vez, a regulação do gene GATA3 pelo vírus HTLVI. Essa regulação pode estar envolvida na fisiopatologia das doenças relacionadas à infecção pelo HTLVI / Abstract: The HTLV-I nonstructural protein Tax plays a crucial role in cellular transformation. It activates the transcription factors of various cellular genes and interacts with cellular proteins. Limited data are available on the interaction between specific T cell transcription factor GATA3 and Tax. hnplication for the significance ofGATA3 on T-cell development and function, (Th2) differentiation, and a role ofGATA3 during immune response has been reported. To determine the effect of the Tax protein on GATA3 gene expression, we investigated the interaction between this protein and the GATA3 promoter and repressor regions. The semi quantitative RT-PCR demonstrated a considerable decrease in the expression of the GATA 3 cDNA all subjects infected by HTLV I and no expression of GATA 3 mRNA was observed in one subject with ATLL and another with HAM/TSP. Results demonstrated an interaction between Tax and GATA3 gene and a role ofTax in the negative regulation of GATA3 expression, through its interaction with the repressor, ZEB. This interaction may be involved in the pathophysiology of adult T cell leukemiallymphoma and tropical spastic paraparesis/HTLV-I-associated myelophathy / Doutorado / Clinica Medica / Doutor em Clínica Médica
2

Adherence of antiretroviral therapy and mental health of HIV-diagnosed patients in Vhembe District, Limpopo Province

Manenzhe, Tovhowani 20 September 2019 (has links)
MA (Psychology) / Department of Psychology / Background: Given that there is 57.7 million HIV-diagnosed people living in South Africa and the government has established the largest public antiretroviral programme in the whole world but only 53% are adhering. Adherence remains a challenge, due to presence of mental health issues among HIV diagnosed. Aim: The aim of this study was to investigate adherence to antiretroviral therapy and mental health of HIV-diagnosed patients in Vhembe District, Limpopo Province. Methods: This was a mixed method study using a combination of quantitative and qualitative research approaches. In the quantitative approach, triangulation was utilised in the form of a questionnaire and patients records. Simple random sampling was used to select 134, descriptive analysis using SPSS version 25. For the qualitative approach, a phenomenological research designs was considered and convenience sampling was used to select fifteen participants (15). Data was collected using semi-structured interview; responses were analysed using a computer-aided program called, ATLAS ti. Results: The self-report of adherence was 94.8 %, objectively 39.6% of CD4 count <200c/mm3 at baseline and 34.3% CD4 count after six months was found. 16.5% of females and 2% of males defaulted treatment and 14.9% of missed medical appointments 1-6 times. This study also revealed the mental health issues that HIV-diagnosed patients are struggling with after the diagnosis include the stages of grief, stress, depression, anxiety, mistrust, shame, stigma and discrimination. Recommendation: Effective strategies need to be enhanced and tailor made in effort to encourage patients to take ART diligently. The healthcare providers, community members and the government should be made aware of mental health issues. / NRF

Page generated in 0.0271 seconds