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J. Virol., Aug 1997, 5915-5921, Vol 71, No. 8
L Rainbow, GM Platt, GR Simpson, R Sarid, SJ Gao, H Stoiber, CS Herrington, PS Moore and TF Schulz
Kaposi's sarcoma (KS)-associated herpesvirus or human herpesvirus 8
(KSHV/HHV8) is the likely cause of KS and primary effusion lymphomas or
body cavity-based lymphomas (BCBLs). A latency-associated nuclear
immunofluorescence antigen (LANA) (D. H. Kedes, E. Operskalski, M. Busch,
R. Kohn, J. Flood, and D. Ganem, Nat. Med. 2:918-924, 1996; S. J. Gao, L.
Kingsley, M. Li, W. Zheng, C. Parravicini, J. Ziegler, R. Newton, C. R.
Rinaldo, A. Saah, J. Phair, R. Detels, Y. Chang, and P. S. Moore, Nat. Med.
2:925-928, 1996) and a 222- to 234-kDa nuclear protein (LNA) (S. J. Gao, L.
Kingsley, D. R. Hoover, T. J. Spira, C. R. Rinaldo, A. Saah, J. Phair, R.
Detels, P. Parry, Y. Chang, and P. S. Moore, N. Engl. J. Med. 335:233-241,
1996) have previously been described in BCBL cell lines by
immunofluorescence and Western blotting techniques, respectively. To
identify the viral gene(s) encoding this antigen(s) we screened a cDNA
library from HBL-6 cells, a B-cell lymphoma cell line persistently infected
with KSHV/HHV8, with KS patient sera. One set of positive clones contained
the 3' end of orf73, as well as the complete orf72 and orfK13, and another
set contained the 5' end of orf73. Comparison of cDNA sequences with the
KSHV/HHV8 genomic sequence revealed a splice event, occurring upstream of
orf73. Immunoaffinity purified antibodies to a recombinant carboxy-terminal
fragment of the orf73-encoded protein showed the characteristic speckled
nuclear immunofluorescence pattern of LANA and reacted with the 222- to
234-kDa LNA on Western blots. Expression of full-length orf73 in bacteria
and COS7 cells reproduced the LNA banding pattern. Immunohistochemistry on
cases of nodular KS revealed that orf73/LNA is expressed in the nucleus of
KS spindle cells. These findings demonstrate that orf73 encodes the 222- to
234-kDa LNA, is a component of LANA, and is expressed in KS tumor cells.
Copyright © 1997, American Society for Microbiology
The 222- to 234-kilodalton latent nuclear protein (LNA) of Kaposi's sarcoma-associated herpesvirus (human herpesvirus 8) is encoded by orf73 and is a component of the latency-associated nuclear antigen
Department of Medical Microbiology and Genitourinary Medicine, The University of Liverpool, United Kingdom.
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