Navegando por Autor "ALMEIDA, Marcella Kelly Costa de"

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Analysis of polymorphisms in the interleukin 18 gene promotor (-137 g/c and -607 c/a) in patients infected with hepatitis c virus from the brazilian amazon
(Universidade Federal do Pará, 2015-09) SANTOS, Kemper Nunes dos; ALMEIDA, Marcella Kelly Costa de; FECURY, Amanda Alves; COSTA, Carlos Araújo da; MARTINS, Luisa Caricio
Background - The hepatitis C virus has been recognized as the leading cause of chronic liver disease in the world. Host genetic factors have been implicated in the persistence of hepatitis C virus infection. Single nucleotide polymorphisms at positions -607 C/A (rs1946518) and -137 G/C (rs187238) in the IL-18 gene promoter have been suggested to be associated with delayed hepatitis C virus clearance and persistence of the disease. Objective - Identify these polymorphisms in a population infected with hepatitis C virus from the Brazilian Amazon region. Methods - In a cross-sectional analytical study conducted in Belém, Pará, Brazil, 304 patients infected with hepatitis C virus were divided into two groups: group A, patients with persistent infection; group B, patients with spontaneous clearance. The control group consisted of 376 volunteers not infected with hepatitis C virus. Samples were analyzed by RT-PCR for the detection of viral RNA and by RFLP-PCR to evaluate the presence of the -137 G/C and -607 C/A IL-18 gene promoter polymorphisms. Results - Comparison of polymorphism allele frequencies between the patient and control groups showed a higher frequency of allele C at position -607 among patients (P=0.02). When the association between the polymorphisms and viral infection was analyzed, patients carrying genotype C/A at position -607 were found to be at higher risk of persistent hepatitis C virus infection (P=0.03). Conclusion - the present results suggest a possible role of the -607 IL-18 gene promoter polymorphism in the pathogenesis of hepatitis C virus infection.
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Caracterização dos genótipos do vírus da hepatite b em pacientes atendidos no programa de hepatites virais do núcleo de medicina tropical – UFPA, Belém - Pará
(Universidade Federal do Pará, 2016-05-27) ALMEIDA, Marcella Kelly Costa de; MARTINS, Luisa Caricio; http://lattes.cnpq.br/1799493244439769
The hepatitis B virus belongs to the genus Orthohepdnavirus and Hepadnaviridae family, comprising a DNA virus capable of infecting mammalian hepatotropic. Classified into 10 genotypes (A-J) and many different subgenotypes, studies suggest that they may influence the severity of the disease, response to treatment and vaccine response. Genotypes and subgenotypes HBV has a wide distribution, some being restricted to certain geographic regions, while others show a worldwide distribution. It is found in different regions of Brazil with prevalence of genotypes A, D and F. This study aimed to identify genotypes and subgenotypes of hepatitis B virus among patients treated at the Tropical Medicine Center - UFPA, in the city of Belém, state Pará, from January 2011 to December 2015. A total of 1274 patients treated at the NMT-UFPA in the period, were selected for the study 222 patients of both sexes, with positive serology for HBsAg and / or anti-HBc. The samples were subjected to molecular biology, PCR "in house" and multiplex PCR to detect viral DNA and genotyping, and then the sequencing for confirmation and determination of viral subgenotypes. In 65 of the 222 samples was detected the presence of HBV DNA, but only 63 samples were satisfactory after the result of sequencing, which were identified the presence of genotypes A (46/63), especially the subgenotype A1 (36/46) followed by subgenotype A2 (10/46), and genotype F (17/63) and only detected subgenotype F2 (17/17) circulating in this population. The average age of the patients was 38 years, predominantly male, and most natural state of Pará patients. Some risk factors have been identified among the population studied, and not using a condom during sex the most predominant. Comparing the presence of viral DNA with serology for HBsAg marker is shown a picture that suggests the presence of occult hepatitis among the patients treated. The results found in this study are consistent with what is reported in other studies in Brazil.
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Hepatitis B and C virus infection among Brazilian Amazon riparians
(2011-10) OLIVEIRA, Claudia Suellen Ferro de; SILVA, Adenielson Vilar e; SANTOS, Kemper Nunes dos; FECURY, Amanda Alves; ALMEIDA, Marcella Kelly Costa de; FERNANDES, Adriana Prado; COSTA, Carlos Araújo da; FREITAS, Andrei Silva; CORVELO, Tereza Cristina de Oliveira; MARTINS, Luisa Caricio
INTRODUCTION: Viral hepatitis is a major public health concern in Brazil. There are few past studies on this issue, especially among riparian communities. This study aims at determining the seroprevalence of viral hepatitis B and C in the riparian community of Pacuí Island, within the Cametá municipality of Pará State, Brazil. Moreover, this study aims to investigate the principal risk factors that this community is exposed to. METHODS: The current study has accessed blood samples from 181 volunteers who have answered an epidemiological questionnaire. Analyses on serological markers have been tested with commercial ELISA kits for detecting HBsAg, total anti-HBc, anti-HBs, and anti-HCV. Within seroreactive patients for HCV, RT-PCR and line probe assay have been performed to identify the viral genotype. RESULTS: In the serological marker analysis for hepatitis B, no reactivity for HBsAg, rate of 1.1% for total anti-HBc, and rate of 19.3% for anti-HBs have been observed. On hepatitis C, 8.8% seroprevalence has been found, in which 62.5% have gotten viral RNA. Among the risk factors studied, the following have been highlighted: non-use of condoms, sharing of cutting instruments, use of illicit drugs, and reports of family disease with HBV or HCV. CONCLUSIONS: The vaccination coverage against HBV is low, and the high prevalence of HCV within this community has been observed.
Acesso aberto (Open Access)
Soroepidemiologia das hepatites virais B e C nas comunidades ribeirinhas residentes na região do lago da usina hidrelétrica de Tucuruí, estado do Pará
(Universidade Federal do Pará, 2012-02-06) ALMEIDA, Marcella Kelly Costa de; MARTINS, Luisa Caricio; http://lattes.cnpq.br/1799493244439769
Viral hepatitis is a disease caused by different etiologic agents that have in common hepatotropism. Epidemiologically, the relevance of these diseases is due to the wide geographic distribution and the huge number of infected individuals in virtually every country in the world. For this study were 668 randomly selected residents of the islands of Tucuruí dam lake. We collected blood samples for research of serological markers HBsAg, anti-HBc, Anti-HBs and anti-HCV using enzyme immunoassay. Patients with reactive serology for HCV were tested by molecular biology (RT-PCR and RFLP) for detection of viral genotypes. Of the 668 coastal studied, 1.95% were positive for HBsAg, 28% for Anti-HBc Total and 41.91% for anti-HBs. The presence of the marker anti-HBs alone (vaccine response) was observed in 25.75% of the volunteers. The serological marker for hepatitis C was observed in 2.24%, and of these 70% had genotype 1. The results indicate an intermediate level of endemicity in this region for HBV and HCV. In addition to HBV vaccination coverage is low.