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HHV-8 vIL-6 promotes productive replication in the context of reactivated lytic replication in primary effusion lymphoma (PEL) and endothelial cells and sustains latently infected PEL cell viability. Viral IL-6 is also considered to contribute significantly to HHV-8-associated pathogenesis, since vIL-6 can promote cell proliferation, cell survival, and angiogenesis that are characteristic of HHV-8-associated Kaposi’s sarcoma, PEL and multicentric Castleman’s disease (MCD), in addition to proinflammatory activities observed in MCD-like “Kaposi’s sarcoma-associated herpesvirus-induced cytokine syndrome.” We show in the present study that vIL-6 can promote productive replication and latent PEL cell viability through upregulation of the mannose-6-phosphate- and peptide hormone-interacting receptor IGF2R, which is a positive factor in HHV-8 biology via these activities. VKORC1v2-enhanced ER-associated degradation of IGF2R and vIL-6 promotion of IGF2R expression through prevention of its interaction with VKORC1v2 and consequent rescue from degradation represent newly recognized activities of VKOCR1v2 and vIL-6.

journal of virology

Insulin-Like Growth Factor 2 Receptor Expression Is Promoted by Human Herpesvirus 8-Encoded Interleukin-6 and Contributes to Viral Latency and Productive Replication