Induction of B Cell Hyperplasia in Simian Immunodeficiency Virus–infected Rhesus Macaques with the Simian Homologue of Kaposi's Sarcoma–associated Herpesvirus

Correspondence to: Scott W. Wong, Division of Pathobiology and Immunology, Oregon Regional Primate Research Center, 505 NW 185th Ave., Beaverton, OR 97006. Tel:503-690-5285 Fax:503-690-5524 E-mail:wongs{at}ohsu.edu.

A simian homologue of Kaposi's sarcoma–associated herpesvirus (KSHV), the eighth human herpesvirus (HHV8), was isolated from a simian immunodeficiency virus (SIV)-infected rhesus macaque (Macaca mulatta) that developed a multicentric lymphoproliferative disorder (LPD). This simian rhadinovirus is genetically similar to a recently described rhesus rhadinovirus (RRV) (Desrosiers, R.C., V.G. Sasseville, S.C. Czajak, X. Zhang, K.G. Mansfield, A. Kaur, R.P. Johnson, A.A. Lackner, and J.U. Jung. 1997. J. Virol. 71:9764–9769) and is designated RRV 17577. RRV 17577 was experimentally inoculated into rhesus macaques with and without SIV_mac239 infection to determine if RRV played a role in development of the LPD observed in the index case. In contrast to control animals inoculated with SIV_mac239 or RRV alone, two animals coinfected with SIV_mac239 and RRV 17577 developed hyperplastic LPD resembling the multicentric plasma cell variant of Castleman's disease, characterized by persistent angiofollicular lymphadenopathy, hepatomegaly, splenomegaly, and hypergammaglobulinemia. Hypergammaglobulinemia was associated with severe immune-mediated hemolytic anemia in one RRV/SIV-infected macaque. Both RRV/SIV-infected macaques exhibited persistent RRV viremia with little or no RRV-specific antibody response. The macaques inoculated with RRV alone displayed transient viremia followed by a vigorous anti-RRV antibody response and lacked evidence of LPD in peripheral blood and lymph nodes. Infectious RRV and RRV DNA were present in hyperplastic lymphoid tissues of the RRV/SIV-infected macaques, suggesting that lymphoid hyperplasia is associated with the high levels of replication. Thus, experimental RRV 17577 infection of SIV-infected rhesus macaques induces some of the hyperplastic B cell LPDs manifested in AIDS patients coinfected with KSHV.

Key Words: B cell hyperplasia, simian immunodeficiency virus, rhesus rhadinovirus, lymphoproliferative disorders, nonhuman primate

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