ABSTRACT
Human herpesvirus 8 (HHV-8), the etiological agent of Kaposi's sarcoma (KS), is endemic in parts of the sub-Saharan, and KS has increased concomitantly with the HIV/AIDS epidemic. In Mozambique (MZ), no data concerning HHV-8 infection was available, thus the main of this work was to investigate, for the first time, the presence of HHV-8 infection in Maputo, MZ. Latent and lytic HHV-8-specific antibodies were assessed in blood samples from 189 individuals from the Central Hospital of Maputo, MZ, using "in-house" immunofluorescence assays conducted in São Paulo, Brazil. The results obtained were analyzed according to socio-demographic and clinical variables using the Chi-square test and logistic regression. An HHV-8 seropositivity of 1.8 percent and 9.7 percent was detected among 57 medical students and 31 individuals from the staff, respectively, in contrast to 16.4 percent detected among 67 out-patients. Concerning 34 hospitalized patients from the Dermatology Unit, 47.1 percent were HHV-8-seropositive overall, while the rate was 85.7 percent among KS patients. The present survey, conducted in Maputo, MZ, demonstrates great variation in HHV-8 infection frequencies depending on the group analyzed and epidemiological variables. An association between HHV-8 seropositivity and male gender (OR 5.72), the central origin of patients (OR 5.33), blood transfusions (OR 3.25), and KS (OR 24.0) was detected among hospitalized patients, and primary school (OR 7.18) and HIV-1 infection (OR 8.76) among out-patients.
Subject(s)
Female , Humans , Male , Antibodies, Viral/blood , Herpesviridae Infections/epidemiology , /isolation & purification , AIDS-Related Opportunistic Infections/diagnosis , AIDS-Related Opportunistic Infections/epidemiology , AIDS-Related Opportunistic Infections/virology , Fluorescent Antibody Technique , Herpesviridae Infections/diagnosis , /immunology , Mozambique/epidemiology , Risk Factors , Socioeconomic FactorsABSTRACT
O Herpesvírus 8 humano (HHV-8) é endêmico em populações africanas e indígenas da região Amazônica. A infecção nestas populações acontece durante a infância e, na África, envolve o contato íntimo no ambiente intrafamiliar. Diversos estudos confirmam a distribuição geográfica dos diferentes subtipos de HHV-8, sendo que o subtipo E é típico das populações indígenas. Objetivos: 1. Caracterizar o(s) subtipo(s) de HHV-8 que circula(m) em população indígena da Amazônia brasileira baseado na análise da região ORF K1 do vírus; 2. Construir a árvore filogenética dos subtipos virais encontrados; 3. Comparar filogeneticamente os subtipos encontrados com os subtipos prevalentes em outras populações indígenas do Brasil e de outros países da América do Sul; 4. Calcular a taxa de substituição para a região VR1 do HHV-8 para as amostras estudadas; 5. Estimar a data de entrada do vírus na população do estudo; 6. Investigar a dinâmica de transmissão do vírus no ambiente intrafamiliar; 7. Averiguar se há correlação entre os alelos de HLA classe I (A e B) e II (DQB1 e DRB1) e suscetibilidade à infecção por HHV-8. Casuística e métodos: Estudo de soroprevalência da infecção por HHV-8 em amostra de população indígena da Amazônia brasileira utilizando IFI para detecção de antígenos da fase latente (LANA) e lítica (Lítico) do vírus. Análise filogenética da amostras encontradas utilizando-se o DNA/HHV-8 extraído de amostras de saliva, submetidas à reação de nested PCR para amplificar as regiões hipervariáveis VR1 e VR2. Cálculo da taxa de substituição do HHV-8, utilizando-se os métodos de distância e técnica bayesiana. Estimar a data do ancestral comum mais recente para as amostras em estudo, utilizando-se o programa BEAST. Tipagem de HLA de indivíduos positivos e negativos para a infecção por HHV-8, utilizando-se a técnica de PCR-SSO. Resultados: A soroprevalência geral da infecção por HHV-8 na população em estudo foi de 75,3% (399/530). Observou-se que a soropositividade...
The human herpesvirus 8 (HHV-8) is endemic in Africa and Amerindian populations from Amazon region. The infection in those populations occurs during childhood and, in Africa, involves a close contact in intrafamilial environment. Several studies confirm the geographical distribution of different subtypes of HHV-8, and the subtype E is typical of the Amerindian population. Objectives: 1. To characterize the HHV-8 subtypes circulating in Amerindian population from Brazilian Amazon, based on the analysis of ORF K1 region of the virus. 2. To construct a phylogenetic tree of viral subtypes found among Amerindians 3. To compare by phylogenetic methods the subtypes found in Mapuera Amerindians with the subtypes prevalent in others Amerindians populations of Brazil and South America 4. To determine the substitution rate of VR1 region of HHV-8 for the sequences obtained in the present study 5. To estimate the date of entry of the viruses in the Mapuera population 6. To investigate the dynamic of transmission of the virus in the intrafamilial environment 7. To investigate if there is a correlation between susceptibility to HHV-8-infection and HLA class I (A and B) and II (DQB1 and DRB1) alleles. Patients and methods: The seroprevalence of HHV-8 infection in a sample of the indigenous population of the Brazilian Amazon was carried out using IFA to detect antibodies to latent (LANA) and lytic phase antigens of HHV-8. Phylogenetic analysis of the sequences was performed by using the DNA extracted from samples of saliva, using a nested PCR to amplify the hypervariable regions VR1/ VR2 of HHV-8. Estimation of the substitution rate of HHV-8 nucleotides was performed by using the method of distance and the Bayesian technique. Estimates of the time of the most recent common ancestor (TMRCA) for all samples studied were done by using the BEAST program. HLA typing of positive and negative subjects for HHV-8 infection was performed by using the PCR-SSO technique...
Subject(s)
Humans , Male , Female , Biological Evolution , Histocompatibility Testing , Indigenous Peoples , Molecular Epidemiology , Seroepidemiologic StudiesABSTRACT
Human herpesvirus-8 (HHV-8) also referred to as Kaposi’s sarcoma-associated herpes-virus (KSHV),is a novel tumor causing virus,which is thought to be the etiologic agent of KS,and also is associated with primary effusion lymphoma(PEL) and multicentric castleman’s disease(MCD) HHV-8 encodes a number of viral proteins, including the proteins associated with HHV-8 latent infection and lytic infection,and the proteins unique to HHV-8,which are critical players in the development of KS and HHV-8-associated diseases. The proteins encoded by HHV-8 and association between HHV-8 and KS were reviewed.
ABSTRACT
BACKGROUND: The association of Kaposi's sarcoma-associated human herpesvirus, or human herpesvirus 8 (HHV8) with various skin diseases has been described in many reports. However, only 3 human diseases: Kaposi's sarcoma, primary effusion lymphoma, and multicentric Castleman disease were proved to be associated with HHV8. In addition to Karposi's sarcoma, sarcoidosis and Kikuchi's disease were also described to be associated with HHV8. OBJECTIVE: The purpose of this study was aimed at the association of HHV8 with various skin diseases, such as Kaposi's sarcoma, sarcoidosis, and Kikuchi's disease. METHODS: We performed PCR to examine whether the 233-bp segment of the viral DNA of HHV8 was detected in Korean patients with Kaposi's sarcoma, sarcoidosis, Kikuchi's disease, angiosarcoma, and angiolymphoid hyperplasia with eosinophilia. The medical records and histopathological specimens of patients diagnosed at Asan Medical Center from 1989 to 1999 were reviewed. RESULTS: HHV8 DNA sequences were identified in 9 (69%) of sarcoid tissues from 12 patients with sarcoidosis and in all (100%) of from 8 patients with Kaposi's sarcoma but not in 2 tissues from 2 patients with Kikuchi's disease, in 3 tissues from 2 patients with angiosarcoma and 2 tissues from 2 patients with angiolymphoid hyperplasia with eosinophilia. CONCLUSION: HHV8 may be strongly associated with the pathogenesis of Kaposi's sarcoma and sarcoidosis. However, the association with Kikuchi's disease, angiosarcoma, and angiolymphoid hyperplasia with eosinophilia was denied in this study. Further extensive study will be needed.