Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros

Base de dados
Ano de publicação
Tipo de documento
País de afiliação
Intervalo de ano de publicação
1.
J Neuroimmune Pharmacol ; 4(1): 103-15, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19034670

RESUMO

OTK18 is a C2H2 type zinc finger protein involved in the regulation of HIV-1 replication in human mononuclear phagocytes. Previously, we reported OTK18 expression in brain perivascular macrophages but not in microglia in HIV encephalitis brain. We have cloned the OTK18 promoter region proximal to the transcriptional start site and determined the region responsible (-884/+1) for the basal transcriptional activity in a microglia cell line. Sequential deletion mutation analyses reveal three important response elements: Yingyang-1 (YY1; -805/-777), an HIV-1 response element for promoter activation; FoxD3 (-743/-725), a negative regulatory element; and Ets response element (-725/-707), a basal transcriptional activity response element. HIV-1 infection-induced upregulation of YY1 and c-Ets-1 protein, binding to the promoter region as determined by immunoblotting and chromatin immunoprecipitation and polymerase chain reaction (PCR) assays, and induction of YY1 was also observed in virus-infected monocyte-derived macrophages. Silencing of FoxD3 and YY1 in the cell line by small interfering RNA duplexes specific to these molecules significantly up- and downregulated basal OTK18 promoter activity in FoxD3 and YY1 response element-dependent manners, respectively. On the other hand, infection of primary cultured human microglia significantly reduced YY1 expression and induced FoxD3 as determined by immunoblotting and reverse transcription real-time PCR. These data suggest that HIV-1 induces OTK18 expression through a YY1-mediated manner in human macrophages, although its gene expression is suppressed by FoxD3 upregulation and YY1 downregulation in human microglia. This mechanism may explain the perivascular macrophage-specific expression of OTK18 in HIV encephalitis brains.


Assuntos
Proteínas de Ligação a DNA/biossíntese , Proteínas de Ligação a DNA/genética , Fatores de Transcrição Forkhead/fisiologia , Infecções por HIV/metabolismo , HIV-1 , Regiões Promotoras Genéticas/genética , Regiões Promotoras Genéticas/fisiologia , Fatores de Transcrição/biossíntese , Fatores de Transcrição/genética , Fator de Transcrição YY1/fisiologia , Região 5'-Flanqueadora/genética , Western Blotting , Imunoprecipitação da Cromatina , Regulação da Expressão Gênica , Humanos , Luciferases/genética , Macrófagos/metabolismo , Microglia/metabolismo , Proteína Proto-Oncogênica c-ets-1/fisiologia , RNA Interferente Pequeno/genética , Elementos Reguladores de Transcrição/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Transfecção
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA