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Epstein-Barr Virus DNA Sequences in Precursor Monocyte-Macrophage Cell Lines Established from the Bone Marrow of Children with Maturation Defects of Haematopoiesis

M. Park^2,

G. Ragona^4,>

¹ Institute of Mutagenesis and Differentiation, CNR, via Svezia 10, 56100 Pisa
² Institute of Cell Biology, CNR, Rome
³ Nucleic Acid Center, CNR, Rome
⁴ Institute of Medical Clinics, Faculty of Medicine, University ‘Tor Vergata’, Rome
and⁵ Department of Biology, Faculty of Sciences, University ‘Tor Vergata’, Rome, Italy

Epstein-Barr virus (EBV) DNA sequences were detected in four established monoblast or early monocytic cell lines (CM-S, ROV-S, CV-S and AD-S) obtained from bone marrow of children suffering from maturation defects of haematopoiesis. EBV is present in these cells in a latent state. The viral DNA in these cell lines was analysed by Southern blot hybridization, using a set of cloned EBV DNA fragments from the EBV strain B95-8 as probes. A common spectrum of highly related but distinguishable EBV DNA restriction enzyme sequences was found, suggesting some genomic diversity. Propagation of the cells in long-term culture revealed a gradual decrease of EBV copies per cell in all lines with some minor changes in the restriction pattern of the EBV DNA. These findings demonstrate that human precursor monocyte cells may be susceptible to infection by EBV.

Keywords: EBV, macrophage progenitors, bone marrow culture

Present address: NCI-Frederick Cancer Research Facility, Box B, Frederick, Maryland 21701, U.S.A.

^> Present address: Department of Experimental Medicine, University of Rome ‘La Sapienza’, Rome, Italy.

Received 13 July 1988; accepted 16 January 1989.

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