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  • Title: Reduced complement-mediated immune complex solubilizing capacity and the presence of incompletely solubilized immune complexes in SLE sera.
    Author: Baatrup G, Petersen I, Jensenius JC, Svehag SE.
    Journal: Clin Exp Immunol; 1983 Nov; 54(2):439-47. PubMed ID: 6652967.
    Abstract:
    Reduced complement-mediated solubilization (CMS) of pre-formed immune complexes (IC) was demonstrated in sera from 11 out of 12 SLE patients. The presence of incompletely solubilized endogeneous IC in SLE sera was indicated by the following findings: (1) When IC positive SLE sera with reduced CMS capacity were mixed with normal donor sera they inhibited the CMS of the latter sera. (2) Resuspended PEG (2.75%) precipitates obtained from SLE sera inhibited the CMS of normal donor sera. (3) Non-solubilized or incompletely complement solubilized IC in SLE sera give a strong response in the PEG-CC assay for IC. The IC activity of SLE sera was clearly reduced in this assay when the endogeneous IC were solubilized prior to testing. In contrast, sera of 14 rheumatoid arthritis (RA) patients exhibited normal CMS. IC which could be further solubilized by complement were not demonstrable although all RA sera were IC positive.
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