Inhibitory effect of igm rheumatoid factor on immune complex solubilization capacity and inhibition of immune precipitation

✍ Scribed by Genesio Balestrieri; Angela Tincani; Paola Migliorini; Clodoveo Ferri; Roberto Cattaneo; Stefano Bombardieri

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 621 KB
• Volume: 27
• Category: Article
• ISSN: 0004-3591
• DOI: 10.1002/art.1780271008

✦ Synopsis

Purified IgM rheumatoid factors (RF; 3 monoclonal and 2 polyclonal) were shown to inhibit, in a dosedependent manner, 2 complement-mediated functions, Le,, the immune complex solubilization capacity and the inhibition of immune precipitation. Inhibition of immune complex solubilization capacity occurred only if RF was added at the same time as, but not after, addition of the complement source. Experimental evidence suggests that the effects of RFs were not related to their anticomplementary activity, but rather required the attachment of RF to the Fc region of the IgG molecule. Although no clinical data are available so far, it might be plausible that these newly described properties of RF have biologic relevance.

It is known that fresh serum solubilizes preformed immune complexes (1) and inhibits their precipitation (2). A number of studies have shown that bath these functions are complement-mediated. The