Abstract
Peripheral blood monocytes (PBM) are one site of persistence of human cytomegalovirus (HCMV) in healthy carriers. However, because PBM circulate only briefly before entering the tissues and are difficult to infect with HCMV, it has been suggested that they may acquire HCMV during development in the bone marrow. Consistent with this, we show evidence that bone marrow progenitors from healthy HCMV carriers contain endogenous HCMV DNA as detected by PCR. We also show that bone marrow precursors are readily infected by clinical isolates of HCMV in vitro but that no viral gene expression occurs until these cells become differentiated. In contrast, incubation of these cells at any developmental stage with the laboratory strain AD169 resulted in few cells expressing viral immediate-early genes, and this correlated with a lack of entry of AD169 virus. These observations are consistent with bone marrow progenitors acting as a reservoir for HCMV and transmitting the viral genome to PBM, in the absence of lytic-gene expression, until they leave the circulation and undergo tissue-specific differentiation to macrophages.
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