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1038A AASLD ABSTRACTS HEPATOLOGY, October, 2015 and 1764 (p=0.04) in the basal core promoter region. In patients >12 years (N=75), 3 groups of baseline mutations were significantly associated with long-term ALT normalization (p
HEPATOLOGY, VOLUME 62, NUMBER 1 (SUPPL) AASLD ABSTRACTS 1039A 1703 Dissecting cellular entry mechanisms by enveloped and nonenveloped hepatitis E virus xin yin, Zongdi Feng; Research Institute at Nationwide Children’s Hospital, Columbus, OH Hepatitis E virus (HEV) infection is a significant global health issue. Recent <strong>studies</strong> show that while nonenveloped HEV virions are shed in feces, the virus circulating in blood is cloaked in host membrane and hidden from neutralizing antibodies. To better understand HEV infection and pathogenesis, we investigate the mechanism by which enveloped HEV (eHEV) enters the cell. Gradient purified enveloped and non-enveloped HEV (genotype 3, Kernow C1/P6) were inoculated to HepG2 cells and cellular pathways and factors involved in HEV entry were studied by using pharmacological inhibitors and siRNA mediated gene depletion. Compared to non-enveloped HEV, cellular attachment of eHEV is much less efficient and its entry is also much slower. Entry of eHEV is also more sensitive to dynamin-2 and clathrin depletion, suggesting eHEV internalization involves clathrin-mediate endocytosis. Knockdown of Rab7A and Rab5A had a greater inhibitory effect on the entry of eHEV than nonenveloped HEV. In addition, treatment of cells with lysosomotropic agents bafilomycin A or NH 4 Cl almost completely blocked the entry of eHEV, but had no effect on the entry of nonenveloped HEV, indicating eHEV also requires endosomal acidification for its entry. Finally, depletion of NPC-1 (Niemann-Pick disease, type C1), a host protein involved in cholesterol transport in late endosomes/ lysosomes and Ebolavirus entry, greatly reduced entry of eHEV, but not nonenveloped HEV. Conclusion: Entry of eHEV involves dynamin-2 and clathrin-mediated endocytosis and requires endosomal acidification. eHEV envelope is likely degraded in endolysosomes in order for the viral capsid to interact with its cellular receptor. These results have important implications for understanding HEV infection and pathogenesis. Disclosures: The following authors have nothing to disclose: xin yin, Zongdi Feng 1704 Pre-core region mutations analysis helps to delineate immune stage in HBeAg+ children with chronic hepatitis B Ivana Carey, Sanjay Bansal, Sarah Tizzard, Matthew J. Bruce, Mary Horner, Kosh Agarwal, Diego Vergani, Giorgina Mieli-Vergani; Institute of Liver Studies, Kings College School of Medicine at King’s College Hospital, London, United Kingdom Interaction between the hepatitis B virus (HBV) and the immune system is crucial for the outcome of chronic hepatitis B (CHB). A recent study shows that presence of pre-core region mutations helps distinguishing between the immune stages of HBeAg+ CHB in adults, immunotolerant patients having no mutations and higher HBsAg plasma levels. There are no data on pre-core region mutations in relation to the immune stage in HBeAg+ CHB children. In this retrospective cross-sectional study on HBeAg+ CHB children with different alanine-aminotransferase (ALT) profiles, we aimed to evaluate the frequency of precore region mutations – basal core promoter (BCP) (A1762T/ G1764A) and stop codon (A1896G) - and its relationship with semi-quantitative HBeAg and HBsAg levels, HBV DNA viral load, HBV genotypes and levels of interferon-gamma-inducible protein 10 (IP10), a chemokine reflecting the activation status of the innate immune system in CHB. Patients: 137 children (median age 9.55 years) with HBeAg+ CHB were followed for at least 2 years (median 5 years) and, based on their ALT profiles, were divided into 3 groups: persistently normal (N) ALT (n=64), fluctuating (F) ALT (n=43) and persistently abnormal (A) ALT (n=30). Material and methods: Plasma samples at diagnosis were used to evaluate BCP and stop codon 1896 mutations and HBV genotypes by direct population sequencing; semi-quantitative HBeAg and HBsAg plasma levels were measured by Abbott ARCHITECT® assay [S/CO & log 10 IU/ ml]; HBV DNA viral load by real-time PCR [log 10 IU/ml] and IP10 plasma levels by ELISA [pg/ml]. Results: Frequencies of BCP and stop codon mutations were higher in patients with fluctuating (F) and abnormal (A) ALT profiles than in patients with normal (N) ALT levels (p
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1312A AUTHOR INDEX HEPATOLOGY, Octo
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1366A CATEGORY INDEX HEPATOLOGY, Oc
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