The human herpes virus 8-encoded chemokine receptor is required for angioproliferation in a murine model of Kaposi's sarcoma

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Kristian K Jensen, Denise J Manfra, Marcos G Grisotto, Andrea P Martin, Galya Vassileva, Kevin Kelley, Thue W Schwartz, Sergio A Lira

Kaposi's sarcoma (KS)-associated herpesvirus or human herpes virus 8 is considered the etiological agent of KS, a highly vascularized neoplasm that is the most common tumor affecting HIV/AIDS patients. The KS-associated herpesvirus/human herpes virus 8 open reading frame 74 encodes a constitutively active G protein-coupled receptor known as vGPCR that binds CXC chemokines with high affinity. In this study, we show that conditional transgenic expression of vGPCR by cells of endothelial origin triggers an angiogenic program in vivo, leading to development of an angioproliferative disease that resembles KS. This angiogenic program consists partly in the expression of the angiogenic factors placental growth factor, platelet-derived growth factor B, and inducible NO synthase by the vGPCR-expressing cells. Finally, we show that continued vGPCR expression is essential for progression of the KS-like phenotype and that down-regulation of vGPCR expression results in reduced expression of angiogenic factors and regression of the lesions. Together, these findings implicate vGPCR as a key element in KS pathogenesis and suggest that strategies to block its function may represent a novel approach for the treatment of KS.
Original languageEnglish
JournalJournal of Immunology
Volume174
Issue number6
Pages (from-to)3686-94
Number of pages8
ISSN0022-1767
Publication statusPublished - 2005

Bibliographical note

Keywords: Animals; Disease Models, Animal; Doxycycline; Gene Expression; Herpesvirus 8, Human; Humans; Mice; Mice, Inbred C57BL; Mice, Inbred DBA; Mice, Transgenic; Neovascularization, Pathologic; Nitric Oxide Synthase; Nitric Oxide Synthase Type II; Platelet-Derived Growth Factor; Pregnancy Proteins; Receptors, Chemokine; Sarcoma, Kaposi; Viral Proteins

ID: 21666452