Kaposi's sarcoma (KS) is an unusual neoplasm characterized by extensive neoangiogenesis, infiltrates of inflammatory cells and atypically differentiated spindle cells of endothelial origin. KS is caused by an oncogenic γ-herpesvirus, Kaposi's sarcoma-associated herpesvirus (KSHV)/human herpesvirus-8 (HHV-8). Several KSHV proteins can subvert multiple cellular angiogenic, mitogenic and inflammatory pathways. Here, we discuss the KSHV encoded membrane proteins vGPCR, K1 and K15, with a particular emphasis on their activation of cellular signaling pathways and their role in the development of specific features of KS.
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