Abstract
The polyomavirus JC (JCV) is the etiologic agent of progressive multifocal leukoencephalopathy (PML). JCV remains quiescent in kidneys, where it displays a stable archetypal regulatory region (RR). Conversely, rearranged JCV RR, including tandem repeat patterns found in the central nervous system (CNS) of PML patients, have been associated with neurovirulence. The precise site and mechanism of JCV RR transformation is unknown. We present herein a patient with rheumatoid arthritis treated with methotrexate, who developed PML and had a rapid fatal outcome. JCV DNA polymerase chain reaction (PCR) was positive in cerebrospinal fluid (CSF), bone marrow, blood, and urine. Double-immunohistochemical staining demonstrated that 9% of bone marrow CD138+ plasma cells sustained productive infection by JCV, accounting for 94% of JCV-infected cells. JCV RR analysis revealed archetype and rearranged RR forms in bone marrow, whereas RR with tandem repeat was predominant in blood. These results suggest that the bone marrow may be a potential site of JCV pathogenic transformation. Further studies will be needed to determine the prevalence of JCV in bone marrow of immunosuppressed individuals at risk of PML and characterize the RR and phenotype of these JCV isolates.
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This work was made possible in part by Public Health Service Grants R01 NS/AI 041198 and NS 047029 to I.J.K.
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Marzocchetti, A., Wuthrich, C., Tan, C.S. et al. Rearrangement of the JC virus regulatory region sequence in the bone marrow of a patient with rheumatoid arthritis and progressive multifocal leukoencephalopathy. Journal of NeuroVirology 14, 455–458 (2008). https://doi.org/10.1080/13550280802356837
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DOI: https://doi.org/10.1080/13550280802356837