Genetic Analyses of Contributions of Viral Interleukin-6 Interactions and Signaling to Human Herpesvirus 8 Productive Replication.

Journal of Virology
Qian LiJ Nicholas

Abstract

Human herpesvirus 8 (HHV-8) viral interleukin-6 (vIL-6) is a cytokine that is poorly secreted and localized largely to the endoplasmic reticulum (ER). It has been implicated, along with other HHV-8 proinflammatory and/or angiogenic viral proteins, in HHV-8-associated Kaposi's sarcoma, primary effusion lymphoma (PEL), and multicentric Castleman's disease (MCD), in addition to an MCD-related disorder involving systemic elevation of proinflammatory cytokines, including vIL-6 and human IL-6 (hIL-6). In these diseases, lytic (productive) replication, in addition to viral latency, is believed to play a critical role. Proreplication activity of vIL-6 has been identified experimentally in PEL and endothelial cells, but the relative contributions of different vIL-6 interactions have not been established. Productive interactions of vIL-6 with the IL-6 signal transducer, gp130, can occur within the ER, but vIL-6 also interacts in the ER with a nonsignaling receptor called vitamin K epoxide reductase complex subunit 1 variant 2 (VKORC1v2), calnexin, and VKORC1v2- and calnexin-associated proteins UDP-glucose:glycoprotein glucosyltransferase 1 (UGGT1) and glucosidase II (GlucII). Here, we report the systematic characterization of interaction...Continue Reading

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