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. 1996 Mar;103(3):414–421. doi: 10.1111/j.1365-2249.1996.tb08296.x

Detection of hepatitis C virus (HCV) proteins by immunofluorescence and HCV RNA genomic sequences by non-isotopic in situ hybridization in bone marrow and peripheral blood mononuclear cells of chronically HCV-infected patients

D SANSONNO 1, A R IACOBELLI 1, V CORNACCHIULO 1, G IODICE 1, F DAMMACCO 1
PMCID: PMC2200370  PMID: 8608640

Abstract

Immunofluorescence (IF) to detect HCV antigens and non-isotopic in situ hybridization (NISH) to detect HCV RNA genome were carried out on bone marrow (BM) and peripheral blood (PB) mononuclear cells (MC) of 11 chronically HCV-infected patients. In four patients (36·4%) HCV antigens were detected in monocytes/macrophages as well as in B lymphocytes in both BMMC and PBMC. Positive T lymphocytes in BMMC were found in three of them, but only one patient showed positive T cells in PBMC. NISH invariably demonstrated minus and plus HCV RNA genomic strands either in monocytes/macrophages or B and T lymphocytes in BMMC and PBMC in the four HCV antigen-positive patients and in two further patients not expressing viral proteins in blood MC. IF signals appeared diffusely distributed within the cytoplasm, or as brilliant granules in distinct submembrane areas or else in cytoplasm membrane. Nuclei never stained. Similarly, NISH displayed HCV RNA accumulation restricted to MC cytoplasm only, nuclei being persistently negative. NISH, however, was unable to detect cell membrane signal. Infection of blood MC is a common event in naturally acquired HCV infection, since none of these patients was conditioned by immunomodulating or immunosuppressive therapies. No difference was found in terms of mean age, length of disease, anti-HCV immune response, type and severity of chronic liver damage between patients with HCV-infected MC and patients without cell infection. These results demonstrate that HCV can infect BMMC and PBMC that represent important extrahepatic sites of virus replication, and may help to explain the immunological abnormalities observed in chronic HCV carriers.

Keywords: chronic liver disease, hepatitis C virus, immunofluorescence, in situ hybridization mononuclear cells

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