Navegando por Autor "COSTA, Carlos Araújo da"

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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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Diversidade clínica e peculiaridades da transmissão do vírus Linfotrópico-T humano em famílias da Região Metropolitana de Belém-Pará
(Universidade Federal do Pará, 2016-06-23) COSTA, Carlos Araújo da; SOUSA, Maisa Silva de; http://lattes.cnpq.br/1775363180781218
The human T-lymphotropic virus type 1 (HTLV-1) and type 2 (HTLV-2), were the first retrovirus discovered in humans and named as such because they inhabit the T-lymphocytes. Both mainly transmitted by being transferred from mother to child due infected lymphocytes in breastfeeding or from a man to a woman by semen. HTLV-1 is the causative agent of an incapacitating myelopathy (HAM/TSP) and Adult T-cell leukemia / lymphoma (ATLL), among other diseases. The high endemicity of such viruses in households of the metropolitan area of Belém-Pará requires investigations to better characterize this viral spread and morbidity. This study was developed in order to identify and characterize the clinical diversity and peculiarities the HTLV transmission in families of the metropolitan region of Belém-Pará. Between 2007 and 2015, we investigated 178 family groups that are confirmed carriers of the virus (index cases). From these families, 140 have HTLV-1 and 38 have HTLV-2, of which 433 members were spontaneously subjected to serologic testing of anti-HTLV-1/2 antibodies. Such test consists on the ELISA method and the detection test of proviral DNA in the blood (PCR). Routes of infection and clinical aspects were evaluated in all individuals and families. From the 611 surveyed 64.6% are female and 37.9% male with, mean age of 41 years. The transmission of HTLV occurred in 92 families (51.8%) with occurrence of three to four infected per family. The infection was more prevalent in females (p< 0.0001) and sexual contact was greater than the vertical (p = 0.0002). 44.3% (62/140) from the index cases of HTLV-1 and 9.9% of their family contacts (11/111) were recognized as symptomatic. The most common diagnostic modalities were neurological (21.4%) and dermatological (19.3%), with a prevalence of neuromuscular osseous symptoms, dysautonomia and skin changes. The main diseases caused by the HTLV-1, out of the 251 infected cases, were: HAM/TSP 7.2% (18); Lymphoproliferative Diseases 2.6 % (6); Strongyloides hyper infection 1.6% (4); Dermatitis Infective in 1.2% (3) and uveitis in 0.4% (1). The parenteral route was the most common form of transmission of HTLV-1 in the causation of neurological diseases (HAM/TSP) whereas the vertical route was the most common form in lymphoproliferative diseases (including ATLL). In some families, HTLV-1 was inlaid spread for generations in a "sui generis" form, mimicking a genetic factor, differentiating itself from other pathogens. It was also observed unmistakable versatility of HTLV-1 to cause a variety of clinical diseases in human bodies, many of them setting well-defined diseases as the causal virus.
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Hematological changes in human lymphotropic-T virus type 1 carriers
(Frontiers Media S.A., 2022) RIBEIRO, Jairo Falcão; NOBRE, Akim Felipe Santos; COVRE, Louise Canto Ferreira; VIANA, Maria de Nazaré do Socorro de Almeida; SILVA, Ingrid Christiane; SANTOS, Leonardo Miranda dos; ISHIKAWA, Edna Aoba Yassui; COSTA, Carlos Araújo da; SOUSA, Maísa Silva de
The human T-lymphotropic virus type 1 (HTLV-1), isolated in 1980, causes T-cell leukemia/lymphoma in adulthood, a type of lymphoproliferative disease, and chronic HTLV-1-associated myelopathy, a disease that causes paralysis of the lower limbs, which occur in about 5% of cases in this viral infection. This study aimed to establish the hematological profile of patients with HTLV-1 infection in Belém do Pará, describing the hematological parameters under study, estimating the frequency of lymphocytic atypical, and associating the hematological profile with diseases and symptoms. Hematologic data from 202 individuals were analyzed, including 87 HTLV-1 infected individuals and 115 non-HTLV-1 infected individuals as a control group, composed, at a great part, of relatives of the infected. The seroprevalence of HTLV-1 infection was observed in 71.3% of female individuals, with predominance in the group older than 50 years (44.8%). The analysis of hematological parameters showed a significant difference in the counts of the segmented cells (p = 0.0303) and eosinophils (p = 0.0092) in HTLV-1 carriers. Lymphocytic atypical was a finding present only in HTLV-1 carriers (p = 0.0001). There was no high frequency in the leukocyte counts of those infected by HTLV-1 not among them concerning a significant increase or decrease. It is concluded that HTLV-1 infection is prominent in women over 50 years old. The hematological profile of those infected shows a reduction of segmented cells, an increase of eosinophils, and the presence of atypical lymphocytes. The hematological profile of the HTLV-1 carrier should always be evaluated to identify early some diseases associated with the infection.
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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.
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Manifestações neurológicas em ribeirinhos de áreas expostas ao mercúrio na Amazônia brasileira
(2013-11) KHOURY, Eliana Dirce Torres; SOUZA, Givago da Silva; SILVEIRA, Luiz Carlos de Lima; COSTA, Carlos Araújo da; ARAUJO, Amelia Ayako Kamogari de; PINHEIRO, Maria da Conceição Nascimento
This study evaluated current levels of mercury exposure and sensory symptoms in adults from three riverine communities in Pará State, Brazil, two of which located in the Tapajós River basin and one in the Tocantins basin. Participants in this study included 78 residents in Barreiras (Tapajós), 30 in São Luiz do Tapajós (Tapajós), and 49 in Furo do Maracujá (Tocantins). Total hair mercury concentrations were quantified by atomic absorption spectrophotometry, and neurological evaluation was conducted by routine examination. Mercury concentrations in the Tapajós communities were higher than those in the Tocantins (p < 0.01). Evaluation of neurological changes showed no significant difference between the communities in exposed areas and control areas for the changes observed by conventional neurological examination, except for gait deviation (p < 0.05). The study concludes that despite the mercury exposure levels, there was a low frequency of sensory alterations according to conventional neurological testing.
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Transmissão intrafamiliar do HTLV: investigação sorológica em familiares de pacientes acompanhados no ambulatório do Núcleo de Medicina Tropical da UFPA
(Universidade Federal do Pará, 2010) COSTA, Carlos Araújo da; SOUSA, Rita Catarina Medeiros; http://lattes.cnpq.br/3560941703812539
The Human T-lymphotropic virus is a oncoretrovírus responsible for lymphoproliferative, inflammatory, degenerative of central nervous system and some human immune disorders. Although associations with various other diseases, tropical spastic paraparesis or HTLV-associated myelopathy (HAM / TSP), progressive and disabling disease of the nervous system, and the Leukemia / Lymphoma, Adult T-Cell (LLcTA), lymphoproliferative disease, malignant and lethal, are the main diseases consistently defined as caused by HTLV-1. The spread of the virus happens quietly, especially from mother to child and through sexual contact. In Brazil, where there are areas of high prevalence, there is still little official information on the transmission. The aim of this study was to determine the seroprevalence of antibodies against T-lymphotropic virus Human T-Cell - types 1 and 2 (HTLV-1 / 2) among relatives of confirmed to carry the virus, registered at the clinic of the Tropical Medicine Nucleus (NMT) to study the characteristics of the HTLV transmission in family groups in the metropolitan area of Belém do Pará was conducted a cross-sectional study of outpatient basis, involving 82 patients enrolled in NMT and their relatives who were tested for antibodies HTLV-1 / 2, using the ELISA test (Ortho Diagnostic System Inc., U.S.) in the period between June 2007 and November 2009. The seroprevalence of HTLV-1 / 2 was observed in 40.2% (33/82) of families and 24.0% (50/208) in the total households surveyed. The transmission from mother to child (a) occurred in 23.2% (19/82) of families, with seropositivity rates of 22.4% (17/76) for girls and 15.2% (7 / 46) for children (p> 0.05). Sexual transmission likely occurred in 25.6% (21/82) of families and 42.0% (21/50) of couples, with rates of seropositivity in wives and husbands of 53.1% (18/34) and 18.8% (3 / 16), respectively (p <0.05). There was no significant difference in seroprevalence among relatives of symptomatic and asymptomatic patients and between HTLV-1 and HTLV-2. Conclude that there is aggregation of the HTLV infection in families investigated and that the data obtained are in agreement with those previously reported in the literature. Care services should routinely carry out the education of HTLV-positive and maintain control measures of family contacts, to prevent the spread of the virus, mainly through sexual contact and breastfeeding.