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Journal of Virology, August 1999, p. 6892-6902, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Long-Term Infection and Transformation of Dermal
Microvascular Endothelial Cells by Human Herpesvirus 8
Ashlee V.
Moses,1,*
Kenneth N.
Fish,1
Rebecca
Ruhl,1
Patricia P.
Smith,1
Joanne G.
Strussenberg,1
Liangjin
Zhu,2
Bala
Chandran,2 and
Jay A.
Nelson1
Department of Molecular Microbiology and
Immunology, Oregon Health Sciences University, Portland, Oregon
97201,1 and Department of Microbiology,
Molecular Genetics and Immunology, University of Kansas Medical
Center, Kansas City, Kansas 661602
Received 4 March 1999/Accepted 10 May 1999
Human herpesvirus 8 (HHV8) infects Kaposi's sarcoma (KS) spindle
cells in situ, as well as the lesional endothelial cells considered to
be spindle cell precursors. The HHV8 genome contains several oncogenes,
suggesting that infection of endothelial and spindle cells could induce
cellular transformation and tumorigenesis and promote the formation of
KS lesions. To investigate the potential of HHV8 infection of
endothelial cells to contribute to the development of KS, we have
developed an in vitro model utilizing dermal microvascular endothelial
cells that support significant HHV8 infection. In contrast to existing
in vitro systems used to study HHV8 pathogenesis, the majority of
dermal endothelial cells are infected with HHV8 and the viral genome is
maintained indefinitely. Infection is predominantly latent, with a
small percentage of cells supporting lytic replication, and latency is
responsive to lytic induction stimuli. Infected endothelial cells
develop a spindle shape resembling that of KS lesional cells and show
characteristics of a transformed phenotype, including loss of contact
inhibition and acquisition of anchorage-independent growth. These
results describe a relevant model system in which to study virus-host
interactions in vitro and demonstrate the ability of HHV8 to induce
phenotypic changes in infected endothelial cells that resemble
characteristics of KS spindle cells in vivo. Thus, our results are
consistent with a direct role for HHV8 in the pathogenesis of KS.
*
Corresponding author. Mailing address: Department of
Molecular Microbiology and Immunology, L220, Oregon Health Sciences
University, 3181 SW Sam Jackson Park Rd., Portland, OR 97201. Phone:
(503) 494-2438. Fax: (503) 494-6862. E-mail:
mosesa{at}ohsu.edu.
Journal of Virology, August 1999, p. 6892-6902, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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