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J Virol. 2010 Dec;84(24):13045-52. doi: 10.1128/JVI.01455-10. Epub 2010 Oct 6.

Immature and transitional B cells are latency reservoirs for a gammaherpesvirus.

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Center for Molecular and Tumor Virology, Department of Microbiology and Immunology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130, USA.


Gammaherpesviruses, including Kaposi's sarcoma-associated herpesvirus (KSHV; also known as human herpesvirus 8 [HHV-8]), Epstein-Barr virus (EBV), and murine gammaherpesvirus 68 (MHV68; also known as gammaherpesvirus 68 [γHV68] or murine herpesvirus 4 [MuHV-4]), establish lifelong latency in the resting memory B cell compartment. However, little is known about how this reservoir of infected mature B cells is maintained for the life of the host. In the context of a normal immune system, the mature B cell pool is naturally maintained by the renewable populations of developing B cells that arise from hematopoiesis. Thus, recurrent infection of these developing B cell populations could allow the virus continual access to the B cell lineage and, subsequent to differentiation, the memory B cell compartment. To begin to address this hypothesis, we examined whether MHV68 establishes latency in developing B cells during a normal course of infection. In work described here, we demonstrate the presence of viral genome in bone marrow pro-pre-B cells and immature B cells during early latency and immature B cells during long-term latency. Further, we show that transitional B cells in the spleen are latently infected and express the latency-associated nuclear antigen (LANA) throughout chronic infection. Because developing B cells normally exhibit a short life span and a high rate of turnover, these findings suggest a model in which gammaherpesviruses may gain access to the mature B cell compartment by recurrent seeding of developing B cells.

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