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Association of Human T Lymphotropic Virus 1 Amplification of Periodontitis Severity with Altered Cytokine Expression in Response to a Standard Periodontopathogen Infection

GARLET, Gustavo Pompermaier; GIOZZA, Silvana Pereira; SILVEIRA, Elcia Maria; CLAUDINO, Marcela; SANTOS, Silvane Braga; AVILA-CAMPOS, Mario Julio; MARTINS JR., Walter; CARDOSO, Cristina Ribeiro; TROMBONE, Ana Paula Favaro; CAMPANELLI, Ana Paula; CARVALHO,
Fonte: UNIV CHICAGO PRESS Publicador: UNIV CHICAGO PRESS
Tipo: Artigo de Revista Científica
Português
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115.88%
Background. Periodontal diseases (PDs) are infectious diseases in which periodontopathogens trigger chronic inflammatory and immune responses that lead to tissue destruction. Recently, viruses have been implicated in the pathogenesis of PDs. Individuals infected with human T lymphotropic virus 1 (HTLV-1) present with abnormal oral health and a marked increased prevalence of periodontal disease. Methods. In this study, we investigated the patterns of periodontopathogen infection and local inflammatory immune markers in HTLV-1-seropositive individuals with chronic periodontitis (CP/HTLV-1 group) compared with HTLV-1 -seronegative individuals with chronic periodontitis (CP group) and periodontally healthy, HTLV-1 -seronegative individuals (control group). Results. Patients in the CP/HTLV-1 group had significantly higher values of bleeding on probing, mean probing depth, and attachment loss than patients in the CP group. The expression of tumor necrosis factor a and interleukin (IL) 4 was found to be similar in the CP and CP/HTLV-1 groups, whereas IL-12 and IL-17 levels trended toward a higher expression in the CP/HTLV-1 group. A significant increase was seen in the levels of IL-1 beta and interferon gamma in the CP/HTLV-1 group compared with the CP group...

Coinfecção pelo vírus da hepatite C (VHC) e vírus linfotrópicos de células T humanas dos tipos 1 (HTLV-1) ou 2 (HTLV-2) em ambulatório de referência de São Paulo: avaliação epidemiológica, clínica, laboratorial e histológica; Co-infection with hepatitis C virus (HCV) and human T-lymphotropic virus types 1 (HTLV-1) and 2 (HTLV-2) in a reference outpatient clinic in São Paulo: epidemiologic, clinical, laboratory and histological evaluation

Milagres, Flávio Augusto de Pádua
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/08/2006 Português
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Por apresentarem mecanismos de transmissão superponíveis, a infecção concomitante pelo vírus da hepatite C (VHC) e pelos vírus linfotrópicos de células T humanas dos tipos 1 (HTLV-1) e 2 (HTLV-2) é esperada. Considerando a relevância dessas infecções em nosso meio e a existência de lacunas no conhecimento da coinfeção VHC/HTLV, conduziu-se este estudo transversal, com o objetivo de comparar uma série de pacientes coinfectados, com indivíduos infectados pelo VHC isoladamente, no tocante a características sócio-demográficas e de exposição aos agentes virais, alterações clínicas e laboratoriais, bem como alterações histológicas do parênquima hepático. Selecionaram-se, com base em algoritmos de diagnóstico sorológico e de biologia molecular, pacientes adultos assistidos em ambulatórios do Hospital das Clínicas da FMUSP entre janeiro de 1993 e agosto de 2005, que apresentaram viremia pelo VHC, associada, ou não, a infecção por HTLV-1 ou HTLV-2, excluindo-se da amostra os coinfectados pelo VHB ou HIV. Coletaram-se dos pacientes selecionados características sócio-demográficas, informações acerca de exposição a vírus de transmissão sexual ou sangüínea, sinais e sintomas clínicos relacionados às infecções causadas pelo VHC ou HTLV...

Avaliação do comprimento dos telômeros em células infectadas pelo vírus HTLV-I utilizando a técnica hibridização in situ fluorescente e citometria de fluxo (Flow-FISH); Telomere length measurements on Human T-cell leukemia virus type I (HTLV-I) infected cells using fluorescence in situ hybridization and flow cytometry (Flow-FISH)

Brocardo, Graciela Aparecida
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/04/2008 Português
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INTRODUÇÃO: A Leucemia/Linfoma de células T do adulto (ATL) é uma doença linfoproliferativa crônica com transformação clonal predominantemente de linfócitos TCD4+, causada pelo vírus linfotrópico T humano do tipo I (HTLV-I). A ATL se desenvolve em 3-5% dos portadores do vírus HTLV-I, após longo período de latência clínica, acompanhado de expansão clonal dos linfócitos infectados. As células da ATL apresentam várias anormalidades cromossômicas, semelhantes àquelas resultantes de disfunção telomérica e a instabilidade genômica contribui para o desenvolvimento da ATL. Para entender o papel do encurtamento telomérico na oncogênese da ATL, avaliamos o comprimento dos telômeros de linfócitos TCD4 e TCD8 em portadores do vírus HTLV-I e em portadores de ATL. RESULTADOS: Não foi evidenciada diferença significativa no comprimento de telômero dos subtipos linfocitários TCD4+ e TCD8+ entre portadores do vírus HTLV-I e indivíduos saudáveis, assim como, entre portadores de ATL e indivíduos saudáveis. Entretanto, quando incluímos na análise a variável idade, evidenciamos redução significativa do comprimento do telômero com a idade em portadores do vírus HTLV-I e maior perda telomérica nos portadores do vírus HTLV-I e portadores de ATL em relação aos indivíduos saudáveis de mesma idade...

Vírus linfotrópicos de células T humanas dos tipos 1 e 2 (HTLV-1 e HTLV-2). Estudo de segmentos do genoma proviral obtidos de pacientes com HIV/Aids de São Paulo e de Londrina e região; Human T-lymphotropic virus type 1 and 2 (HTLV-1 and HTLV-2). Study on proviral genome segments obtained from patients with HIV/Aids from Sao Paulo and Londrina and vicinities.

Magri, Mariana Cavalheiro
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 26/09/2013 Português
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126%
O Brasil é considerado o país com o maior número absoluto de indivíduos infectados pelos vírus linfotrópicos de células T humanas dos tipos 1 e 2 (HTLV-1 e HTLV2), perto de 2,5 milhões; além disso, é também considerado epidêmico para o HIV e, portanto, casos de coinfecção HIV/HTLV são frequentes no país. O presente trabalho efetuou o seqüenciamento das regiões LTR, env e tax do genoma proviral do HTLV-1 e do HTLV-2 isolados das amostras de sangue de pacientes coinfectados pelo HIV-1 de Londrina e região (n=34) e de São Paulo (n=20), para realizar a caracterização molecular e determinar subtipos virais. Foram utilizadas na análise das sequências as ferramentas Sequencher 4.7, BLAST, Genotyping-NCBI, Subtyping-REGA, BioEdit 7.0.5.3, ClustalW, GenBank, PAUP 4.0.b10, Modeltest 3.7, TreeView 1.6.6 e MEGA4. As diversas análises confirmaram como subtipos prevalentes o HTLV-1a, subgrupo Transcontinental A, e o HTLV-2a (variante -2c). Foram detectadas assinaturas moleculares nos isolados do Brasil. Detectou-se o genótipo brasileiro taxA para o HTLV-1 e para o HTLV-2 a Tax longa, a qual é característica da variante HTLV-2c. Houve também a confirmação da troca de aminoácido S1909P no env dos HTLV-2. Especulou-se sobre duas entradas do HTLV-1 no Brasil e sobre a disseminação do HTLV-2c em grupos distintos quanto ao comportamento de risco e região geográfica. O estabelecimento de métodos laboratoriais otimizados para isolados brasileiros de HTLV-1 e HTLV-2 possibilitou melhor compreensão da diversidade genômica e da origem e disseminação dos HTLVs em populações coinfectadas pelo HIV no Brasil.; Brazil is considered the country with the major absolute number of individuals infected with human T-lymphotropic virus types 1 and 2 (HTLV-1 and HTLV-2)...

NLRP3 polymorphism is associated with protection against human T-lymphotropic virus 1 infection

Kamada,Anselmo Jiro; Pontillo,Alessandra; Guimarães,Rafael Lima; Loureiro,Paula; Crovella,Sergio; Brandão,Lucas André Cavalcanti
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2014 Português
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115.79%
Inter-individual heterogeneity in the response to human T-lymphotropic virus 1 (HTLV-1) infection has been partially attributed to host genetic background. The antiviral activity of the inflammasome cytoplasmic complex recognises viral molecular patterns and regulates immune responses via the activation of interleukin (IL)-1 family (IL-1, IL-18 and IL-33) members. The association between polymorphisms in the inflammasome receptors NLRP1 and NLRP3 and HTLV-1 infection was evaluated in a northeastern Brazilian population (84 HTLV-1 carriers and 155 healthy controls). NLRP3 rs10754558 G/G was associated with protection against HTLV-1 infection (p = 0.012; odds ratio = 0.37). rs10754558 affects NLRP3 mRNA stability; therefore, our results suggest that higher NLRP3 expression may augment first-line defences, leading to the effective protection against HTLV-1 infection.

Western blot seroindeterminate individuals for Human T-lymphotropic Virus 1/2 (HTLV-1/2) in Fortaleza (Brazil): a serological and molecular diagnostic and epidemiological approach

Santos,Terezinha de Jesus Teixeira; Costa,Carlos Maurício de Castro; Goubau,Patrick; Vandamme,Anne-Mieke; Desmyter,Jan; Van Dooren,Sonia; Mota,Rosa M. S.; Costa,Francine Bovy de Castro; Oliveira,Ana C. S.; Gomes,Vânia Barreto A.F.; Carneiro-Proietti,Ann
Fonte: Brazilian Society of Infectious Diseases Publicador: Brazilian Society of Infectious Diseases
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2003 Português
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115.79%
How to handle Western blot (WB) seroindeterminate individuals for Human T-lymphotropic Virus 1/2 (HTLV-1/2) constitutes a challenge for blood banks and fam ilies. We made a cross-sectional study of 191 enzyme linked immunoassay (EIA) reactive individuals from the hematological center (HEMOCE) of Fortaleza (Brazil), examining their serological (WB) and molecular (PCR) diagnosis, and demographic profiles, as well as a possible association of their condition with other infectious pathologies and risk factors. Ethical institutional approval and personal consent were obtained. Out of 191 EIA reactive individuals, 118 were WB seroindeterminate and 73 were seropositive for HTLV-1/2. In the PCR analysis of 41 WB seroindeterminate individuals, 9 (22%) were positive and 32 (78%) were negative for HTLV-1/2. The demographic analysis indicated a trend towards a predominance of males among the seroindeterminate individuals and females in the seropositive ones. The seroindeterminate individuals were younger than the seropositive ones. We did not find any association of these conditions with syphilis, Chagas disease or HIV or hepatitis, and with risk factors such as breast-feeding, blood transfusion, STD (syphilis) and IDU.

Seroprevalence of HTLV-1/2 among blood donors in the state of Maranhao, Brazil

Viana,Graca Maria de Castro; Nascimento,Maria do Desterro Soares Brandao; Oliveira,Rodrigo Artur Souza de; Santos,Alessandro Carvalho dos; Galvao,Carolina de Souza; Silva,Marcos Antonio Custodio Neto da
Fonte: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular Publicador: Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2014 Português
Relevância na Pesquisa
115.9%
Background: Infection with human T-lymphotropic virus 1 or 2 (HTLV-1/2) is a major health problem. There is a public health policy defining measures for state hematology and hemotherapy centers in Brazil, in order to avoid virus transmission through blood donors. Objective: This study aimed to evaluate the seroprevalence of HTLV -1/2 in blood donors in the State of Maranhão, Brazil, during routine blood unit screening. Methods: Screening tests of blood donors using the enzyme-linked immunosorbent assay (ELISA) to detect seropositivity for HTLV-1/2 performed at the Hematology and Hemotherapy Center of the State of Maranhão (HEMOMAR) between July of 2003 and December of 2009 were retrospectively evaluated. Results: Of the 365,564 blood donors, 561 (0.15%) were HTLV-1/2-positive, of whom 72 (12.8%) performed the confirmatory test (Western blot). In donors who had a confirmatory test, 53 (73.6%) were positive. The ages of the infected individuals ranged from 18 to 65 years; 305 (54%) were aged over 40 years. Among the infected individuals, 309 (55%) were male, 399 (71%) were mixed-race, and 259 (46%) were single. Co-infections were frequently found, especially with hepatitis B (in 68.6% of the cases). Conclusion: The results obtained will contribute to the planning and implementation of control measures by the epidemiological surveillance agency of Maranhão...

Case report of adult T-cell lymphoma/leukemia

Brito Junior,Lacy Cardoso de; Rocha,Euzamar Gaby; Santos,Sérgio Antônio Batista dos; Francês,Larissa Tatiane Martins
Fonte: Sociedade Brasileira de Patologia Clínica; Sociedade Brasileira de Patologia; Sociedade Brasileira de Citopatologia Publicador: Sociedade Brasileira de Patologia Clínica; Sociedade Brasileira de Patologia; Sociedade Brasileira de Citopatologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2013 Português
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105.81%
The adult T-cell leukemia/lymphoma (ATLL) is a rare type of lymphoma caused by human T lymphotropic virus type 1 (HTLV-1). The clinical manifestations include cutaneous lesions, adenopathies, myelopathy/ tropical spastic paraparesis, uveitis, ophthalmological diseases, leukocytosis with lymphocytosis and atypical lymphocytes. The main objective of this study was to report a case of a female patient with ATLL, a farmer with leukocytosis, lymphocytosis, bilateral ocular erythema, cervical lymphadenopathy, in the abdominal visceromegalies and with positive markers for T-cell lymphocytes (CD45, CD2, CD3, CD5, CD4 and CD25). Although ATLL is a rare disease, its delayed diagnosis may lead to serious complications and fatal outcome.

Human T-Lymphotropic Virus-1 Visualized at the Virological Synapse by Electron Tomography

Majorovits, Endre; Nejmeddine, Mohamed; Tanaka, Yuetsu; Taylor, Graham P.; Fuller, Stephen D.; Bangham, Charles R. M.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 28/05/2008 Português
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105.91%
Human T-lymphotropic virus 1 (HTLV-1) is transmitted directly between cells via an organized cell-cell contact called a virological synapse (VS) [1], [2]. The VS has been studied by light microscopy, but the ultrastructure of the VS and the nature of the transmitted viral particle have remained unknown. Cell-free enveloped virions of HTLV-1 are undetectable in the serum of individuals infected with the human T-lymphotropic virus 1 (HTLV-1) and during in vitro culture of naturally infected lymphocytes. However, the viral envelope protein is required for infectivity of HTLV-1, suggesting that complete, enveloped HTLV-1 virions are transferred across the synapse. Here, we use electron tomography combined with immunostaining of viral protein to demonstrate the presence of enveloped HTLV-1 particles within the VS formed between naturally infected lymphocytes. We show in 3D that HTLV-1 particles can be detected in multiple synaptic clefts at different locations simultaneously within the same VS. The synaptic clefts are surrounded by the tightly apposed plasma membranes of the two cells. HTLV-1 virions can contact the recipient cell membrane before detaching from the infected cell. The results show that the HTLV-1 virological synapse that forms spontaneously between lymphocytes of HTLV-1 infected individuals allows direct cell-cell transmission of the virus by triggered...

Downregulation of CDKN1A in Adult T-Cell Leukemia/Lymphoma despite Overexpression of CDKN1A in Human T-Lymphotropic Virus 1-Infected Cell Lines▿ †

Watanabe, Masaaki; Nakahata, Shingo; Hamasaki, Makoto; Saito, Yusuke; Kawano, Yohei; Hidaka, Tomonori; Yamashita, Kiyoshi; Umeki, Kazumi; Taki, Tomohiko; Taniwaki, Masafumi; Okayama, Akihiko; Morishita, Kazuhiro
Fonte: American Society for Microbiology (ASM) Publicador: American Society for Microbiology (ASM)
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
105.83%
Human T-lymphotropic virus 1 (HTLV-1) causes an aggressive malignancy of T lymphocytes called adult T-cell leukemia/lymphoma (ATLL), and expression of HTLV-1 Tax influences cell survival, proliferation, and genomic stability in the infected T lymphocytes. Cyclin-dependent kinase inhibitor 1A (CDKN1A/p21waf1/Cip1) is upregulated by Tax, without perturbation of cell cycle control. During an analysis of the gene expression profiles of ATLL cells, we found very low expression of CDKN1A in ATLL-derived cell lines and ATLL cells from patient samples, and epigenetic abnormalities including promoter methylation are one of the mechanisms for the low CDKN1A expression in ATLL cells. Three HTLV-1-infected cell lines showed high levels of expression of both CDKN1A and Tax, but expression of CDKN1A was detected in only two of six ATLL-derived cell lines. In both the HTLV-1-infected and ATLL cell lines, we found that activated Akt phosphorylates CDKN1A at threonine 145 (T145), leading to cytoplasmic localization of CDKNIA. In HTLV-1-infected cell lines, cytoplasmic CDKN1A did not inhibit the cell cycle after UV irradiation; however, following treatment with LY294002, a PI3K inhibitor, CDKN1A was dephosphorylated and relocalized to the nucleus, resulting in suppression of the cell cycle. In the ATLL cell lines...

Strongyloidiasis and Infective Dermatitis Alter Human T Lymphotropic Virus-1 Clonality in vivo

Gillet, Nicolas A.; Cook, Lucy; Laydon, Daniel J.; Hlela, Carol; Verdonck, Kristien; Alvarez, Carolina; Gotuzzo, Eduardo; Clark, Daniel; Farré, Lourdes; Bittencourt, Achiléa; Asquith, Becca; Taylor, Graham P.; Bangham, Charles R. M.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
105.83%
Human T-lymphotropic Virus-1 (HTLV-1) is a retrovirus that persists lifelong by driving clonal proliferation of infected T-cells. HTLV-1 causes a neuroinflammatory disease and adult T-cell leukemia/lymphoma. Strongyloidiasis, a gastrointestinal infection by the helminth Strongyloides stercoralis, and Infective Dermatitis associated with HTLV-1 (IDH), appear to be risk factors for the development of HTLV-1 related diseases. We used high-throughput sequencing to map and quantify the insertion sites of the provirus in order to monitor the clonality of the HTLV-1-infected T-cell population (i.e. the number of distinct clones and abundance of each clone). A newly developed biodiversity estimator called “DivE” was used to estimate the total number of clones in the blood. We found that the major determinant of proviral load in all subjects without leukemia/lymphoma was the total number of HTLV-1-infected clones. Nevertheless, the significantly higher proviral load in patients with strongyloidiasis or IDH was due to an increase in the mean clone abundance, not to an increase in the number of infected clones. These patients appear to be less capable of restricting clone abundance than those with HTLV-1 alone. In patients co-infected with Strongyloides there was an increased degree of oligoclonal expansion and a higher rate of turnover (i.e. appearance and disappearance) of HTLV-1-infected clones. In Strongyloides co-infected patients and those with IDH...

Meningitis associated with strongyloidiasis in an area endemic for strongyloidiasis and human T-lymphotropic virus-1: a single-center experience in Japan between 1990 and 2010

Sasaki, Y.; Taniguchi, T.; Kinjo, M.; McGill, R. L.; McGill, A. T.; Tsuha, S.; Shiiki, S.
Fonte: Springer Berlin Heidelberg Publicador: Springer Berlin Heidelberg
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
115.8%
Meningitis caused by enteric flora is a known complication of strongyloidiasis, and human T-lymphotropic virus-1 (HTLV-1) predisposes individuals to severe strongyloidiasis. We reviewed the clinical features of bacterial meningitis associated with strongyloidiasis seen at a single center in subtropical Japan, in an area endemic for both strongyloidiasis and HTLV-1. We found 33 episodes in 21 patients between 1990 and 2010. The results were remarkable for the high incidence of meningitis due to Gram-positive cocci (27.3 %), especially Streptococcus bovis, and culture-negative cases (42.4 %). Given the high incidence of Gram-positive meningitis, a modified approach to corticosteroid use would be advisable in areas where strongyloidiasis is endemic, due to the potentially adverse consequences of glucocorticoid therapy.

Human T-Lymphotropic Virus-1 Associated with Adult T-Cell Lymphoma/ Leukemia and Generalized Expansion of Palatal and Jaw Bones: A Rare Case Report

Dalirsani, Zohreh; Javadzade Bolouri, Abbas; Delavarian, Zahra; Bidad, Salma; Sanatkhani, Majid; Amirchaghmaghi, Maryam
Fonte: Shiraz University of Medical Sciences Publicador: Shiraz University of Medical Sciences
Tipo: Artigo de Revista Científica
Publicado em /09/2015 Português
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Human T-lymphotropic virus-1 (HTLV-1) can cause adult T-cell leukemia/ lymphoma (ATL/L), which is a rare and aggressive type of blood cancer.

Prevalência da infecção e caracterização molecular no vírus linfotrópico de células T humanas 1 (HTLV-1) em remanescentes de quilombos no Brasil Central; Prevalence of infection and molecular characterization of human T-cell lymphotropic virus 1 (HTLV-1) in remaining quilombos in Central Brazil

NASCIMENTO, Laura Branquinho do
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Medicina Tropical; Medicina Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Medicina Tropical; Medicina
Tipo: Dissertação Formato: application/pdf
Português
Relevância na Pesquisa
125.97%
Human T-lymphotropic virus 1 (HTLV-1) has infected human beings for thousands of years, but knowledge about the infection is only recently emerging. The virus can be transmitted from mother to child, through sexual contact, and contaminated blood products. There are endemic areas for this infection in sub-Saharan Africa and South America. African individuals were introduced in Brazil by slave trade. Some of them escaped to remote valleys and stayed in communities, called quilombos. Nowadays, their history and tradition allows them to be identified as remnants of quilombos. The epidemiological status of HTLV infection of these communities remains unknown. The aim of this study was to investigate the epidemiological and molecular profile of HTLV infection among remnant communities in Central Brazil. This study included 1,837 individuals from 13 quilombo remnant communities in the States of Goiás and Mato Grosso do Sul. They were interviewed about demographic and risk characteristics known to be associated with HTLV transmission. Blood samples were collected from all individuals and screened by ELISA for the presence of antibodies to HTLV 1/2. Positive samples were tested for confirmation by western blot and/or PCR. Also, they were submitted to sequencing and phylogenetic analyses. Of the 1...

Hepatitis C virus and human T-lymphotropic virus coinfection: epidemiological, clinical, laboratory and histopathological features; Coinfecção vírus da hepatite C-vírus linfotrópico de células T humanas: aspectos epidemiológicos, clínicos, laboratoriais e histopatológicos

MILAGRES, Flávio Augusto Pádua; DUARTE, Maria Irma Seixas; VISO, Ana Teresa; SEGURADO, Aluisio Cotrim
Fonte: Sociedade Brasileira de Medicina Tropical - SBMT Publicador: Sociedade Brasileira de Medicina Tropical - SBMT
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
126%
Twenty-four hepatitis C virus patients coinfected with human T-lymphotropic virus type 1 were compared with six coinfected with HTLV-2 and 55 with HCV alone, regarding clinical, epidemiological, laboratory and histopathological data. Fischer's discriminant analysis was applied to define functions capable of differentiating between the study groups (HCV, HCV/HTLV-1 and HCV/HTLV-2). The discriminant accuracy was evaluated by cross-validation. Alcohol consumption, use of intravenous drugs or inhaled cocaine and sexual partnership with intravenous drug users were more frequent in the HCV/HTLV-2 group, whereas patients in the HCV group more often reported abdominal pain or a sexual partner with hepatitis. Coinfected patients presented higher platelet counts, but aminotransferase and gamma-glutamyl transpeptidase levels were higher among HCV-infected subjects. No significant difference between the groups was seen regarding liver histopathological findings. Through discriminant analysis, classification functions were defined, including sex, age group, intravenous drug use and sexual partner with hepatitis. Cross-validation revealed high discriminant accuracy for the HCV group.; Compararam-se 24 pacientes coinfectados pelos vírus da hepatite C/vírus linfotrópico de células T humanas do tipo 1 com 6 coinfectados por VHC/HTLV-2 e 55 infectados pelo VHC...

Hepatitis C virus and human T-lymphotropic virus coinfection: epidemiological, clinical, laboratory and histopathological features

Milagres,Flávio Augusto Pádua; Duarte,Maria Irma Seixas; Viso,Ana Teresa; Segurado,Aluisio Cotrim
Fonte: Sociedade Brasileira de Medicina Tropical - SBMT Publicador: Sociedade Brasileira de Medicina Tropical - SBMT
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2009 Português
Relevância na Pesquisa
125.96%
Twenty-four hepatitis C virus patients coinfected with human T-lymphotropic virus type 1 were compared with six coinfected with HTLV-2 and 55 with HCV alone, regarding clinical, epidemiological, laboratory and histopathological data. Fischer's discriminant analysis was applied to define functions capable of differentiating between the study groups (HCV, HCV/HTLV-1 and HCV/HTLV-2). The discriminant accuracy was evaluated by cross-validation. Alcohol consumption, use of intravenous drugs or inhaled cocaine and sexual partnership with intravenous drug users were more frequent in the HCV/HTLV-2 group, whereas patients in the HCV group more often reported abdominal pain or a sexual partner with hepatitis. Coinfected patients presented higher platelet counts, but aminotransferase and gamma-glutamyl transpeptidase levels were higher among HCV-infected subjects. No significant difference between the groups was seen regarding liver histopathological findings. Through discriminant analysis, classification functions were defined, including sex, age group, intravenous drug use and sexual partner with hepatitis. Cross-validation revealed high discriminant accuracy for the HCV group.

Resonancia magnética de médula espinal y cerebro en el correlato clínico de la paraparesia espástica progresiva que se asocia al virus humano linfotrópico tipo-I (HTLV-I); Brain and spinal cord magnetic resonance imaging in spastic paraparesis associated to human T-lymphotropic virus

Cartier, Luis; García F., Luis; Cervilla O., Jorge
Fonte: Universidade do Chile Publicador: Universidade do Chile
Tipo: Artículo de revista
Português
Relevância na Pesquisa
105.8%
Background: The spastic paraparesis associated to HTLV-1 causes degenerative pyramidal tract lesions of the spinal cord and affects cortical-nuclear connections in the brain. Aim: To report the findings of magnetic resonance imaging in patients with spastic paraparesis. Material and methods: A magnetic resonance imaging of the brain and spinal cord was performed in 30 patients (24 females), mean age and evolution of 56 and 12 years respectively, with a clinical and virological diagnosis of tropical spastic paraparesis/HTLV-1 associated myelopathy (TSP/HAM). Results: No patient had abnormal signals in the spinal cord parenchyma. However, an atrophy of the dorsal segment was observed in 87% of patients. Patients with the highest degree of atrophy showed a higher degree of functional impairment. Eleven patients had spinal cord conus atrophy, associated to neurogenic bladder or impotency. In 80% of patients, hyperintense subcortical white matter images in DP, T2 and Flair, mostly bi frontal, were detected. In half of them, small rounded and isolated images were observed. In the other half, eight or more images, generally larger and occasionally confluent, were found. Ten of 12 patients with confluent brain lesions showed different degrees of cognitive impairment. No patient had lesions in the corpus callosus...

Búsqueda del ADN del virus HTLV-1 en biopsias de pacientes con linfoma cutáneo de células T

Benedetto E,Juana; Molgó N,Montserrat; González B,Sergio
Fonte: Sociedad Médica de Santiago Publicador: Sociedad Médica de Santiago
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2014 Português
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115.85%
Background: Human T-lymphotropic virus-1 (HTLV-1) infection has been associated with the pathogenesis of cutaneous T cell lymphomas (CTCL). Aim: To search for HTLV-1 DNA in skin biopsies of patients with CTCL. Material and Methods: A retrospective study was conducted using 25 biopsies of patients with CTCL. DNA was extracted from lymphoid tissue by microdissection. A nested PCR was conducted to detect HTLV-1 genome using primers for the tax region. As negative controls, four cases of superficial perivascular dermatitis were chosen. As positive controls, five cases of T-cell leukemia/lymphoma (ATCL) were studied. Results: A positive reaction was found in 3 of 25 cases. These biopsies corresponded to a case of Mycosis Fungoides, a case of CD30 (-) T-cell lymphoma and a case of lymphomatoid papulosis. Search was negative in the four cases of superficial perivascular dermatitis and positive in four cases of adult T-cell leukemia/lymphoma (ATCL). Conclusions: HTLV-1 DNA search in tissues is a useful tool recommended to study T-cell lymphomas. HTLV-1 infection only occurs in sporadic cases but may contribute to tumor aggressiveness and prognosis.

Detección de virus linfotrópico de células T humano-I/II en pacientes con enfermedades de transmisión sexual de Santiago

Sanhueza,David; Ramírez,Eugenio; Navarrete,Nelson; Santander,Ester; Garmendia,María Luisa; Martínez,María José
Fonte: Sociedad Médica de Santiago Publicador: Sociedad Médica de Santiago
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2012 Português
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105.89%
Background: The human T-lymphotropic virus I (HTLV-I) causes spastic para-paresis and adult T-cell leukemia/lymphoma. It can be sexually transmitted and is highly prevalent in Central and South America. Aim: To study HTLV-I/IIprevalence in serum samples obtained from two Sexually Transmitted Diseases (STD) clinics. Material and Methods: Two hundred serum samples were randomly chosen from two reference STD centers of Santiago. The presence of specific HTLV I/II antibodies was detected by indirect immunofluorescence. Results: The analyzed samples came from participants aged 14 to 70 years. Forty nine percent were women and 76% were heterosexual. Only one of the 200 samples was positive (0.5%) and it came from a 70 year-old woman, housewife, with a stable single partner, a history of recurrent genital ulcers, VDRL (-) and positive serology for herpes simplex virus. Conclusions: The prevalence of HTLV-I found in this group is similar to that demonstrated in other populations in Chile, except for aboriginal populations, and similar to international STD studies. Our data is consistent with the low transmissibility by sexual contact.

Geographic distribution of human T-lymphotropic virus types 1 and 2 among mothers of newborns tested during neonatal screening, Minas Gerais, Brazil

Ribeiro,Maísa Aparecida; Proietti,Fernando Augusto; Martins,Marina Lobato; Januário,José Nélio; Ladeira,Roberto Vagner Puglia; Oliveira,Maria de Fátima; Carneiro-Proietti,Anna Bárbara de Freitas
Fonte: Organización Panamericana de la Salud Publicador: Organización Panamericana de la Salud
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2010 Português
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OBJECTIVE: To evaluate the geographic distribution of human T-lymphotropic virus types 1 and 2 (HTLV-1/2) in the State of Minas Gerais, Brazil, in puerperal women whose newborns were tested for HTLV-1/2 during neonatal screening, and to overlap seropositivity with social and economic status determinants. METHODS: During September-November 2007, the dry-blood samples taken from newborns on filter paper for routine screening were also tested for maternal IgG anti-HTLV-1/2 antibodies. For reactive samples, the mothers of the newborns had blood drawn to test for these viruses. RESULTS: The study analyzed 55 293 specimens taken from newborns. Of these, 52 (9.4 per 10 000) were reactive and 42 mothers (7.6 per 10 000) were confirmed with HTLV-1/2 infection. HTLV-1/2 geographic distribution was heterogeneous, with a tendency to be higher in the North and North-East parts of Minas Gerais. The highest rates of seropositivity were observed in Vale do Mucuri (55.9 per 10 000) and in Jequitinhonha (16.0 per 10 000), overlapping with the State's worst social and economic indicators. CONCLUSIONS: To our knowledge this was the first time that neonatal screening for HTLV-1/2 was performed in Brazil. This model could be used in other areas with high HTLV-1/2 prevalence rates. The detection of carrier mothers can enable intervention measures...