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Citation Information: J Clin Invest. 2001;108(12):1789-1796. https://doi.org/10.1172/JCI13622.
Abstract
ORF74 (or KSHV-vGPCR) is a highly constitutively active G protein–coupled receptor encoded by HHV8 that is regulated both positively and negatively by endogenous chemokines. When expressed in transgenic mice, this chemokine receptor induces an angioproliferative disease closely resembling Kaposi sarcoma (KS). Here we demonstrate that several lines of mice carrying mutated receptors deficient in either constitutive activity or chemokine regulation fail to develop KS-like disease. In addition, animals expressing a receptor that preserves chemokine binding and constitutive activity but that does not respond to agonist stimulation have a much lower incidence of angiogenic lesions and tumors. These results indicate that induction of the KS-like disease in transgenic mice by ORF74 requires not only high constitutive signaling activity but also modulation of this activity by endogenous chemokines.
Authors
Peter J. Holst, Mette M. Rosenkilde, Denise Manfra, Shu-Cheng Chen, Maria T. Wiekowski, Birgitte Holst, Felix Cifire, Martin Lipp, Thue W. Schwartz, Sergio A. Lira
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