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Kaposi's Sarcoma: Human Herpesvirus 8 Studied for Immunologic Role in Pathogenesis

AIDSWEEKLY Plus; Monday, June 5, 2000
Prepared by AIDS Weekly editors from staff and other reports


NewsRx -- A new study conducted in Sao Paulo, Brazil, adds additional evidence linking human herpesvirus 8 (HHV-8) with Kaposi's sarcoma (KS), a malignant skin disease sometimes seen in patients with the human immunodeficiency virus (HIV).

L.C. Pierrotti and colleagues reported on their study of HHV-8 viremia and antibody response in a selected group of patients with Kaposi's sarcoma in the Journal of Clinical Virology ("Detection of human herpesvirus 8 DNA and antibodies to latent nuclear and lytic-phase antigens in serial samples from AIDS patients with Kaposi's Sarcoma," J Clin Virol, 2000;16(3):247-251).

They analyzed paired samples using peripheral blood mononuclear cells (PBMCs) and blood serum to detect HHV-8 DNA and antibodies to HHV-8 latent nuclear antigen (LANA) and lytic antigen. These samples were obtained from 12 patients with KS who were taking antiretroviral therapy.

"HHV-8 DNA was detected in 33.3% of the first PBMC samples. Among the eight PCR-negative patients, four presented positive samples during the follow-up and four remained negative," according to Pierrotti et al.

In addition, five of these patients demonstrated evidence of intermittent viremia, the investigators said.

Immunologic response, as determined by antibody response, was also interesting.

"Six patients (50%) had anti-LANA antibodies at the entry in the study. Among the six seronegative patients, two seroconverted two months later and four patients remained seronegative during the five to eight months of follow-up," Pierrotti et al. reported.

By the time their paper was submitted, all of the study patients had antibodies to HHV-8 lytic antigen, investigators noted.

Pierrotti et al. suggested, "The presence of HHV-8 viremia could be related to the severity of KS and could be intermittent even under highly active antiretroviral therapy (HAART). A longer follow-up is needed to confirm these results."

The corresponding author for this study is L.C. Pierrotti Virology Laboratory, Av Dr Eneas de Carvalho Aguiar 470, BR-05403000 Sao Paulo, Brazil.

Key points reported in this study are:

This article was prepared by AIDS Weekly editors from staff and other reports.

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