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Synovial cell lines were established from patients with rheumatoid arthritis (RA) and from normal human embryos. High levels of hyaluronic acid (HA) were produced by some RA cell lines, some of which were partially or completely resistant to infection with Newcastle disease virus (NDV), vesicular stomatitis virus (VSV), and rubella virus (RV). Normal fetal synovial cells lines were susceptible to NDV, VSV, and RV. Infection with virus became possible after treatment of RA cells with hyaluronidase to depolymerize HA, and HA prevented infection of normal synovial cells with VSV. These results provide evidence that HA and not chronic or latent viral infection is responsible for the lack of susceptibility of RA synovial cells to certain viruses.
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