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. 1997 Oct;71(10):7963–7968. doi: 10.1128/jvi.71.10.7963-7968.1997

Monocytes in Kaposi's sarcoma lesions are productively infected by human herpesvirus 8.

C Blasig 1, C Zietz 1, B Haar 1, F Neipel 1, S Esser 1, N H Brockmeyer 1, E Tschachler 1, S Colombini 1, B Ensoli 1, M Stürzl 1
PMCID: PMC192155  PMID: 9311888

Abstract

PCR analysis and serological studies demonstrated a close association between Kaposi's sarcoma (KS)-associated herpesvirus, or human herpesvirus 8 (HHV-8), and the development of Kaposi's sarcoma (KS). The majority of the KS cells were shown to be latently infected by the virus. In this study we investigated which type of cell is productively infected in KS lesions. In situ hybridization was performed with strand-specific RNA probes complementary to the sequences coding for the minor capsid protein (VP23) of HHV-8. The VP23 gene is specifically expressed during the lytic or replicative period of the virus life cycle, and therefore it is a useful marker to detect productively infected cells. By in situ hybridization of KS lesions, a strong hybridization signal was detected only in a small subset of the KS cells of the lesions. Simultaneous application of immunohistochemical staining and in situ hybridization identified the virus-replicating cells to be of monocytic origin. Productively infected monocytes may be an important reservoir for transmission of the virus and for the increase and maintenance of the high load of HHV-8 generally observed in nodular KS lesions during late stages of infection.

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Selected References

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