RESUMO
Mother-child human leukocyte antigen (HLA)diversity is protective for vertical transmission of some viruses. The aim of this study is to evaluate the role of mother-child HLA diversity on hepatitis C virus (HCV) vertical transmission. Forty consecutive HCV infected and 46 consecutive control uninfected children born to HCV-RNA positive mothers were evaluated for HLA class-1 type concordance with their mothers. No significant difference in the degree of HLA concordance was found between HCV infected and uninfected children both when A, B, C (p=0.30) and when only A and B alleles were evaluated (p=0.59). Mother-infant HLA concordance does not affect HCV vertical transmission.
Assuntos
Antígenos HLA/genética , Hepacivirus , Hepatite C Crônica/transmissão , Transmissão Vertical de Doenças Infecciosas , Adulto , Alelos , Variação Antigênica/genética , Feminino , Hepatite C Crônica/congênito , Hepatite C Crônica/virologia , Teste de Histocompatibilidade , Humanos , Recém-Nascido , Gravidez , RNA/biossíntese , RNA/genéticaRESUMO
Sphingomyelinase (SMase) and ceramidase (CDase) activities participate in sphingomyelin (SM) metabolism and have a role in the signal transduction of a variety of ligands. In this study evidence is presented that caveolin-enriched light membranes (CELMs) of murine endothelial cells, characterized by high SM, ceramide (Cer) and cholesterol content, bear acid and neutral SMase as well as neutral CDase activities. Localization of neutral CDase in CELMs was confirmed by Western analysis. Notably, cell treatment with cyclodextrin, which depleted cell cholesterol, did not affect acid or neutral SMase activities but significantly enhanced neutral CDase activity in CELMs, indicating a negative role for cholesterol in CDase regulation. These findings suggest that neutral CDase is implicated, together with SMase activities, in the control of caveolar Cer content that may be critical for caveola dynamics.