Dissertações em Doenças Tropicais (Mestrado) - PPGDT/NMT
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3559
O Mestrado Acadêmico em Doenças Tropicais iniciou em 2004 e pertence ao Programa de Pós-Graduação em Doenças Tropicais do Núcleo de Medicina Tropical (NMT) da Universidade Federal do Pará (UFPA).
Navegar
Navegando Dissertações em Doenças Tropicais (Mestrado) - PPGDT/NMT por CNPq "CNPQ::CIENCIAS BIOLOGICAS::BIOQUIMICA::BIOLOGIA MOLECULAR"
Agora exibindo 1 - 7 de 7
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Análise conformacional da enzima protease do HIV-1 relacionada à resistência ao inibidor Nelfinavir(Universidade Federal do Pará, 2017) HOLANDA, Luiz Henrique Campos; SILVA, Jerônimo Lameira; http://lattes.cnpq.br/7711489635465954; SOUSA, Maisa Silva de; http://lattes.cnpq.br/1775363180781218The Human Immunodeficiency Virus (HIV), which causes acquired immunodeficiency syndrome (AIDS), is a retrovirus that has highly virulent glycoproteins that invade the CD4 + T lymphocyte through its CCR4 and CXCR5 receptors. The biological cycle of HIV is mediated by the protease, transcriptase and integrase enzymes. HIV-1 protease is an enzyme that is present in the final phase of the biological cycle, where virus maturation occurs, and is an important pharmacological target. The main objective of this project is to verify the effects of the D30N, I84A and M46I mutations on the HIV-1 protease enzyme and the complex formation with the nelfinavir inhibitor through molecular dynamics and bioinformatics techniques. The results based on the structural analyzes showed structural differences between the studied systems. The 1OHR system presented a closed conformation, the systems D30N and D30N_I84A_M46I presented semi-open conformation and the D30N_I84A system presented open conformation, in which the latter presented lower free energy value and greater instability in the RMSD analyzes, however the greater flotation of residues Of amino acids. The theoretical analyzes showed the importance in the resistance of the double mutation D30N_I84A and the conformational restructuring capacity of the M46I mutation and catalytic capacity.Item Acesso aberto (Open Access) Detecção de vírus Influenza A em aves migratórias capturadas em regiões litorâneas dos estados da Bahia, Pará e Pernambuco(Universidade Federal do Pará, 2014) FERREIRA, Deimy Lima; MELLO, Wyller Alencar de; http://lattes.cnpq.br/1784167608719139; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539The Influenza virus is known for its ability to infect a wide variety of animals, such as mammals (humans, pigs, horses, whales), domestic birds (chicken [Gallus gallus], goose, turkey [Meleagris ocellata]) beyond wild birds of the orders Anseriformes (duck, wild goose and swan) and Charadriiformes (seagulls, swallows, aquatic birds and sandpipers) these being its natural host. Comprehend the movement of long distance migratory wild birds is crucial to explain the movement of avian influenza viruses. This event causes movement of the birds are acting as an important means of spreading the virus along a migratory route, a fact widely accepted. During the period 2006 and 2007, samples were collected 2,252 samples from a variety of bird species captured in locations which are part of the Atlantic migration route and Mississippi, in the states of Bahia, Para and Pernambuco for epidemiological surveillance of West Nile virus and influenza. The objective of this study was to investigate the circulation of influenza virus among migratory birds that use the routes that pass the above states. For this, the samples were analyzed by means of molecular biological techniques, which comprised two main steps: a) extraction of DNA / RNA from the biological specimen; b) amplification of the gene encoding cytochrome oxidase control of by the technical Polymerase Chain Reaction (PCR) and amplification of the vRNA by Real time Reverse Transcripition polimerase chain reaction (RT-qPCR). The results obtained showed that the total samples tested, 7.2% (n = 158) were positive by RT-qPCR for Influenza A virus. We observed a difference in positivity for the virus among bird species analyzed, which is 3.58% for Charadriformes order, 26.3% among the birds of the order Anseriformes, 5.3% of birds belonging to the order Pelecaniformes and 10.9% for those order Suliformes. Among the samples of the orders Passeriformes and Columbiformes, no sample was positive for Influenza Virus. The data suggest variation among the sampling sites, and the state of Para with the lowest percentage of positivity, the second highest rate with Bahia and Pernambuco finally presenting higher prevalence of absolute value. This study shows that although rare investigations in Brazilian territory, there has been movement of Influenza A viruses among several species of migratory birds that utilize the states of Para, Bahia and Pernambuco as stopping places and reproduction of their species. These findings justify further investigations to understand the dynamics of avian influenza viruses circulating in the population of wild birds in Brazil, and its role as a potential source of infection for other animals, including humans.Item Acesso aberto (Open Access) Investigação da prevalência da amebíase em escolares do município de Imperatriz-MA(Universidade Federal do Pará, 2012) BELFORT, Marcia Guelma Santos; ISHIKAWA, Edna Aoba Yassui; http://lattes.cnpq.br/3074963539505872Amoebiasis is an infection caused by Entamoeba histolytica and an important cause of morbidity and mortality worldwide. Studies have reported a high prevalence of in tropic amebiasis al regions, especially in communities living in poor sanitary conditions. The epidemiological study of amoebiasis has been reevaluated since E. histolytica, pathogenic form, was distinct from E. dispar, non-pathogenic form. The aim of this study was to estimate the prevalence of E. histolytica in the population of the municipal city Imperatriz (MA). We conducted a cross-sectional study involving 405 students. By the screening of the complex E. histolytica / E.dispar parasitological examination was performed using the sedimentation method. The positive samples for E.histolytica/ E.dispar complex were subjected to polymerase chain reaction (PCR) for species differentiation. For initial amplification by the PCR we used a outer primer set E1 and E2 that amplified a 1076 bp fragment and followed by a multiplex PCR using inner primer set Ed-L/Ed-R and Eh-L/Eh-R E.histolytica and E.dispar respectively. No sample showing positivity for E. histolytica The prevalence of E.dispar in the population was 2.7% (11/405). The PCR proved important tool for the differential diagnosis of Entamoebas. However, studies on the prevalence of amoebiasis should be conducted in population with different characteristics, in order to contribute effectively to define the epidemiological situation of this infection in Imperatriz city.Item Acesso aberto (Open Access) Perfil das mulheres ribeirinhas com infecção pelo Papilomavírus humano, com ênfase nos tipos 16 e 18, em populações da Amazônia oriental(Universidade Federal do Pará, 2015) DUARTE, Daniel Valim; SOUSA, Maisa Silva de; http://lattes.cnpq.br/1775363180781218The human papilomavírus (HPV) is the cause of the most common sexually transmitted infection in the world and is recognized as the main causative agent of cervical cancer, but little is known about the prevalence of this virus in isolated communities in the Amazon. We aimed in this study to identify among women in riverside communities of several municipalities in the state of Pará - Brazil, the general and specific prevalence of HPV infection and HPV types 16 and 18, building an epidemiological profile of women positive for the virus and these types. Between February and December 2008, cervical samples riverside women were collected on active serach for the Pap smear testing. In these samples, molecular analysis of HPV were performed by conventional polymerase chain reaction (PCR) followed by real-time PCR to diagnose types 16 and 18. Of the 353 samples tested, 58 (16.4%) were positive for HPV , of these 8 (2,3%) were identified positive for type 16 and 5 (1,4 %) were positive for type 18 with one case of infection by both types investigated . Women under 16 years had 34.6 % prevalence had rate and women between 52 and 66 years rate of 29.8 % (p=0.003), women who reported having only one fixed sexual partner had lower prevalence of viral infection (11,8%) (p<0,001). There was a relative increase in viral presence in accordance with the severity cytological shown (p = 0.026). There was no statistical association between viral types 16 and 18 with the variables investigated. The presence of HPV and its most associated with cervical cancer types highlights the importance of specific actions aimed at the prevention, transmission and screening of lesions related to this virus in the river communities of the target municipalities.Item Acesso aberto (Open Access) Prevalência da Hepatite B oculta nos pacientes atendidos no Núcleo de Medicina Tropical da Universidade Federal do Pará, Amazônia Brasileira(Universidade Federal do Pará, 2016-03-15) SANT'ANNA, Carla de Castro; MARTINS, Luisa Caricio; http://lattes.cnpq.br/1799493244439769Infection with hepatitis B occult (OBI) is characterized by absence of hepatitis B surface antigen (HBsAg) in commercial immunoassays, despite the persintência HBV DNA in the serum and / or liver tissue. The few studies of this clinical form in Brazil, mainly in the Amazon region, seen as an endemic area for hepatitis B virus (HBV), hamper the analysis to identify the epidemiological profile of the site. The objective of study was to determine the prevalence of hepatitis B occult in patients attended at the Tropical Medicine Center outpatient - Federal University of Pará, from January 2011 to December 2015, characterization of circulating viral genotypes and identify the main risk factors for the acquisition of this clinical form. Four hundred and sixty-five serum samples were submitted to ELISA (Enzyme-linked immunosorbent assay) for detection of serological markers of HBV (HBsAg, anti-HBc and anti-HBs). Total 181 patients resulted in a non-reactive HBsAg, anti-HBc reactive and anti-HBs nonreactive. These were screened with a PCR assay for identification of HBV-DNA. Subsequently, the positive samples were sequenced to identify the genotypes and mutations. Of the 181 samples, 26 (14,36%) had serum HBV-DNA, demonstrating the infection by OBI. The average age of 39 years, 53.45% (14/26) were married and 50% (13/26) were male. The genotype A was found in 88.46% (23/26), with the most prevalent subgenotype A1 with 78.26% (18/23) and genotype A2 with 21.73% (5/23). The genotype F was found in only 11.53% (3/26), in the presence of F2 genotype in all samples. As for risk factors only the nail pliers share was statistically significant. Some amino acid substitutions were identified in samples of patients with HBO compared with the HBsAg samples reagentes, but no mutation was identified. The study found a high prevalence of hepatitis B occult in patients treated at the Tropical Medicine Center – UFPA. HBV molecular studies are of fundamental importance for the identification of patients who are considered healthy, but they do have the infection and can be a transmitter disease potential.Item Acesso aberto (Open Access) Prevalência e variabilidade genotípica de Chlamydia trachomatis em amostras cervicais de estudantes universitárias em Belém, Pará, Brasil(Universidade Federal do Pará, 2015) SANTOS, Leonardo Miranda dos; SOUSA, Maisa Silva de; http://lattes.cnpq.br/1775363180781218Infection with Chlamydia trachomatis is a Sexually Transmitted Infection (STI) more prevalent bacterial in the world and can be asymptomatic in up to 80% of cases and is associated with late complications. The university students are part of a differentiated demand of the population for their high level of education. Objective was to assess the prevalence and variability of the genotypes of C. trachomatis in cervical infection of public university students in the state of Pará, Brazil, and to evaluate the association of the respective socio-behavioral characteristics and gynecological complaints. They included 438 college students from September 2012 to October 2014 and cervical samples were obtained during gynecological examination. It was performed phenol-chloroform technique for extracting total DNA from the sample cervical secretion, and for the detection of C. trachomatis used the Polymerase Chain Reaction (PCR) PCR-seminested the type for amplification 224pb gene omp1. For the identification of genotypes, we carried out a nested PCR for the amplification of the gene omp1 990pb, which was purified and subjected to ABI3130 sequencer, then the nucleotide sequences were compared with GenBank. The prevalence of cervical infection by C. trachomatis was 12.5% (CI: 95% ± 5.89) and genotypes were identified J genotype (36.3%), followed by D genotypes (18.2%) E (18.2%), F (18.2%) and la (9.1%). There was no significant association for age, first sexual intercourse, number of partners, and condoms are used, the presence of gynecological complaints and genotypes found in the study population. Although the prevalence found present itself high among university students, the lack of statistical significance may be due to small sample size and/or result in socially acceptable answers. Efforts are made to trace the expansion of C. trachomatis infection in restricted populations.Item Acesso aberto (Open Access) Transmissão intrafamiliar do Vírus linfotrópico de Células T Humanas tipo 1 em Belém, Pará, Brasil(Universidade Federal do Pará, 2012) ALMEIDA, Danilo de Souza; SOUSA, Maisa Silva de; http://lattes.cnpq.br/1775363180781218Retroviruses belong to a group of infectious agents that have received more attention from the scientific community since the early 19706, when cellular oncogenes have been reported related to them. From these preliminary studies it was described the first human retrovirus, virus Human T lymphotropic 1 (HTLV-1)20. Besides the leukemia/lymphoma adult T cell, HTLV-1 is also causing a degenerative neurological disease associated myelopathy tropical spastic HTLV-1/paraparesia (HAM / TSP) 7, 21. Blood samples from patients and their families living with the virus, seen in the NMT/UFPA were analyzed by molecular method, aiming to investigate the intrafamilial transmission of HTLV-1. Intrafamilial transmission was observed with 100% similarity between the nucleotide bases in nine (75%) of the 12 families studied, of which two families showed vertical transmission, sexual transmission had three families and three families who had both types of transmission. It was observed that three families change occurred in more than one nucleotide base pair, and in two families diverged by 0.2% and 0.4%, ie, had high similarity between their nucleotides (> 99.4 %), suggesting that in this case there intrafamilial transmission of HTLV-1. In one family there was a difference of 1.83%, indicating no intrafamilial transmission. The nucleotide sequence of the 5 'LTR segment and phylogenetic analysis showed high similarity entres the strains isolated in this study and confirmed the occurrence of the Cosmopolitan subtype Transcontinental subgroup. This study provides molecular evidence of intrafamilial transmission of HTLV-1 in patients treated at the Tropical Medicine Center UFPA. In this study the routes of transmission as breastfeeding and sex, was more prevalent for this spread.