PMID: 7939135Jan 1, 1994Paper

Expression of the components and regulatory proteins of the classical pathway of complement in normal and diseased synovium

Rheumatology International
P GulatiK Whaley


We studied the synthesis of the classical pathway complement components in synovial membrane. Ribonucleic acid was extracted from the synovial membranes of patients with rheumatoid arthritis (RA) or osteoarthritis (OA), as well as from normal synovial membrane. Northern blot and dot blot analysis showed that the mRNAs for all classical pathway complement components (C1qA chain, C1qB chain, C1qC chain, C1r, C1s, C4 and C2) and the fluid-phase regulatory components (C1-inhibitor, C4-bp and factor I) were present in all three types of synovial membrane. Thus, all the components of the classical pathway were expressed in normal and diseased synovium. In an attempt to determine which components were synthesised by each cell type, monocytes (mononuclear phagocytes), human umbilical vein endothelial cells (HUVEC), synovial membrane fibroblasts (from normal, OA and RA synovial membrane) and peripheral blood lymphocytes were cultured in vitro and secretion rates of individual components were measured and total cellular RNA was analysed by Northern blotting. Monocytes secreted C1q, C1r, C1s, C4, C2, C1-inhibitor and C4-bp but not factor I. Fibroblasts secreted C1r, C1s, C2, C3, C1-inhibitor and factor I but not C1q, C4 or C4-bp. HUVEC se...Continue Reading


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