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Apolipoprotein E (ApoE) on the HCV envelope mediates virus attachment to host cells as well as immune evasion. This interaction is thought to occur in hepatocytes, as ApoE plays dual functions in HCV assembly and maturation as well as cell attachment. In the present study, we found that secreted ApoE (sApoE) can also bind to viral particles via its C-terminal domain after HCV is released from the cell. Furthermore, the binding affinity of interactions between the sApoE N terminus and cell surface receptors affected HCV infectivity in a dose-dependent manner. The extracellular binding of sApoE to HCV is dependent on HCV envelope proteins, and recombinant HCV envelope proteins are also able to bind to sApoE. These results suggest that extracellular interactions between HCV and sApoE may potentially complicate vaccine development and studies of viral pathogenesis.<\/jats:p>\n          <jats:p>\n            <jats:bold>IMPORTANCE<\/jats:bold>\n            End-stage liver disease caused by chronic HCV infection remains a clinical challenge, and there is an urgent need for a prophylactic method of controlling HCV infection. Because host immunity against HCV is poorly understood, additional investigations of host-virus interactions in the context of HCV are important. HCV is primarily transmitted through blood, which is rich in lipoproteins. Therefore, it is of interest to further determine how HCV interacts with lipoproteins in human blood. In this study, we found that secreted ApoE (sApoE), an exchangeable component found in lipoproteins, participates in extracellular interactions with HCV virions. More significantly, different variants of sApoE differentially affect HCV infection efficiency in a dose-dependent manner. These findings provide greater insight into HCV infection and host immunity and could help propel the development of new strategies for preventing HCV infection.\n          <\/jats:p>","DOI":"10.1128\/jvi.02227-16","type":"journal-article","created":{"date-parts":[[2017,5,25]],"date-time":"2017-05-25T00:40:15Z","timestamp":1495672815000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":21,"title":["Extracellular Interactions between Hepatitis C Virus and Secreted Apolipoprotein E"],"prefix":"10.1128","volume":"91","author":[{"given":"Zhihua","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"},{"name":"Centre for Tuberculosis Research, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yadong","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanwei","family":"Bi","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"},{"name":"Centre for Tuberculosis Research, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yufeng","family":"Yao","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qihan","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6617-6768","authenticated-orcid":false,"given":"Wei","family":"Cun","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"},{"name":"Centre for Tuberculosis Research, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaozhong","family":"Dong","sequence":"additional","affiliation":[{"name":"Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, Yunnan, China"},{"name":"Yunnan Key Laboratory of Vaccine Research and Development of Severe Infectious Disease, Kunming, Yunnan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/hep.26141"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.7150\/ijms.3.47"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhep.2014.08.003"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199811193392101"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhep.2014.09.009"},{"key":"e_1_3_2_7_2","first-page":"1253","volume-title":"Fields virology","author":"Lemon SM","year":"2007","unstructured":"Lemon SM Walker C Alter MJ Yi M . 2007. 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