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Journal of Virology, November 2001, p. 10933-10940, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10933-10940.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Human Herpesvirus 8 (HHV-8)-Encoded Cytokines Induce Expression of and Autocrine Signaling by Vascular Endothelial Growth Factor (VEGF) in HHV-8-Infected Primary-Effusion Lymphoma Cell Lines and Mediate VEGF-Independent Antiapoptotic Effects

Chaoqi Liu, Yury Okruzhnov, Hong Li, and John Nicholas^*

Molecular Virology Laboratories, Johns Hopkins Oncology Center, Baltimore, Maryland 21231

Received 7 May 2001/Accepted 10 August 2001

The potential roles of human herpesvirus 8 (HHV-8) cytokines in HHV-8 pathogenesis were investigated by determining the expression of the HHV-8 chemokines viral macrophage inflammatory protein 1A (vMIP-1A) and vMIP-1B in primary effusion lymphoma (PEL)-derived cell lines and examining the signaling activities of these chemokines and HHV-8-encoded vIL-6 in these cells. Secreted vMIP-1A and vMIP-1B were detected in biologically significant concentrations following tetradecanoyl phorbol acetate treatment, which induces productive replication. vIL-6 and vMIP-1A, added exogenously to cultures of four different PEL cell lines, induced the expression of vascular endothelial growth factor type B (VEGF-B) and VEGF-A, respectively. These cells were found to express VEGF receptor 1 (Flt-1) protein, and signaling by recombinant VEGF-A₁₆₅ was demonstrated for two of the PEL cell lines, indicating the potential for autocrine, as well as paracrine, effects of viral cytokine-induced VEGF. In addition, vMIP-1A and vMIP-1B, but not VEGF-A₁₆₅, were found to inhibit chemically induced apoptosis in PEL cells. Our data suggest that vIL-6 and vMIP-1A may influence PEL through VEGF autocrine and paracrine signaling that promotes PEL cell growth and extravascular effusion and that vMIP-1A and vMIP-1B can act independently of VEGF as antiapoptotic factors.

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^* Corresponding author. Mailing address: Molecular Virology Laboratories, Johns Hopkins Oncology Center, 1650 Orleans St., Baltimore, MD 21231. Phone: (410) 502-6801. Fax: (410) 502-6802. E-mail: nichojo{at}jhmi.edu.

In memory of Bill Burns.

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Journal of Virology, November 2001, p. 10933-10940, Vol. 75, No. 22
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.22.10933-10940.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

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