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| Content Provider | PubMed Central |
|---|---|
| Author | Nydegger, U. E. Zubler, R. H. Gabay, R. Joliat, G. Karagevrekis, C. H. Lambert, P. H. Miescher, P. A. |
| Abstract | Quantitative determination of the small C3 breakdown product, C3d, was used to investigate complement activation in 45 plasma samples from 30 patients with rheumatoid arthritis (RA). The mean plasma C3e level in these samples (3.0 +/- 1.3 mg/100 ml) was significantly increased (P less than 0.001) as compared to patients with degenerative joint disease (0.9 +/- 0.4 mg/100 ml) and healthy blood donors (0.8 +/- 0.5 mg/100 ml). C3d levels were increased by more than s SD in 79% of RA samples. Plasma C3d levels were compared with C3d concentrations in synovial fluid. In most RA patients, the C3d levels were higher in synovial fluid than in plasma. A very significant correlation between plasma C3d levels and circulating immune complexes, as measured by determination of Clq binding activity (Clq BA), was observed (P less than 0.001). C3d levels were more elevated in RA patients with extra-articular disease manifestations (3.8 +/- 1.2 mg/100 ml) as compared to patients with joint disease alone (2.2 +/- 1.0 mg/100 ml). C3d levels and Clq BA were also significantly correlated (P less than 0.001) with the RA disease activity expressed by an index derived from sedimentation rate, joint score, and duration of morning stiffness. A close relationship between C3d levels, Clq BA, and the clinical activity further appeared during follow-up studies. The present observations suggest that a parallel but rather independent activation of the complement system may be induced by immune complexes in circulating blood and in the joint spaces during the course of rheumatoid arthritis. |
| Starting Page | 862 |
| File Format | |
| ISSN | 00219738 |
| Journal | Journal of Clinical Investigation |
| Issue Number | 5 |
| Volume Number | 59 |
| Language | English |
| Publisher Date | 1977-05-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine |
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