Hepatitis C Virus (HCV) in Lymphocyte Subsets and in B Lymphocytes Expressing Rheumatoid Factor Cross-reacting Idiotype in Type II Mixed Cryoglobulinaemia
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The IgMk rheumatoid factors (RF) of type II mixed cryoglobulinaemia (MC) react, in 95% of cases, with MoAbs against the cross-reactive idiotypes (CRI) Cc1 or Lc1 (corresponding to the products of the VH1 and VH4 genes). MC is closely associated with HCV infection, a virus which infects lymphocytes and may replicate in B cells. It has been suggested that HCV may induce clonal selection of B cells producing monoclonal IgMk RF in type II MC. To verify whether HCV is enriched in B cells, and in the subsets expressing Cc1 and Lc1 CRI, we studied peripheral blood lymphocytes from eight patients with MC and HCV RNA-positive sera. Seven patients had RF reacting with anti-Cc1, the other with anti-Lc1 CRI. Total lymphocytes, T cells, B cells, and Cc1+ or Lc1+, Cc1- or Lc1- B cells were purified using MoAb-coated magnetic beads. Lymphocyte subsets were then diluted to give a range of 1 x 106-1 x 103 cells and tested for HCV RNA by reverse transcriptase-polymerase chain reaction. HCV was found exclusively in B cells in seven out of eight patients. In three patients HCV was enriched in the Cc1+ cells. In one of these patients, HCV was found exclusively in Cc1+ cells, with Cc1- cells being HCV-. The data indicate that B cells from type II MC patients are almost constantly infected by HCV. In selected cases, B cell subsets expressing IgMk RF CRI are the prevalent cell type infected by HCV. Our data suggest HCV involvement in B cell dysregulation leading to cryoprecipitable IgMk RF production.
Yu Y, Shi X, Wang X, Zhang P, Bai O, Li Y Cell Biosci. 2022; 12(1):30.
PMID: 35279210 PMC: 8917635. DOI: 10.1186/s13578-022-00763-0.
Advances in HCV and Cryoglobulinemic Vasculitis in the Era of DAAs: Are We at the End of the Road?.
Bunchorntavakul C, Mitrani R, Reddy K J Clin Exp Hepatol. 2018; 8(1):81-94.
PMID: 29743799 PMC: 5938331. DOI: 10.1016/j.jceh.2017.11.012.
Park G, Kim D, Park S, Lee H, Kim J, Kim Y Int J Mol Med. 2015; 36(6):1464-78.
PMID: 26498453 PMC: 4678167. DOI: 10.3892/ijmm.2015.2372.
Autoimmune manifestations in viral hepatitis.
Vergani D, Mieli-Vergani G Semin Immunopathol. 2012; 35(1):73-85.
PMID: 23010889 DOI: 10.1007/s00281-012-0328-6.
Bumbea H, Vladareanu A, Vintilescu A, Radesi S, Ciufu C, Onisai M J Med Life. 2012; 4(3):256-63.
PMID: 22567048 PMC: 3168828.