A link between B cell receptor expression and autoantibody production in rheumatoid arthritis
By now, it is a well known fact, that B cells play an important role in the development of autoimmunity. On the one hand, they are the precursors of the antibody-secreting plasmablasts and memory cells; on the other hand they also act as antigen-presenting cells.
Various cells of the immune system express a plethora of receptors that bind to the
Fc-portion of immune complexes containing IgG (Fc-gamma-receptors, FcγR), but
B cells and plasma cells only express the low affinity FcγRIIb. This receptor has repressive functions and mediates the deletion of autoreactive B cells and the inhibition of IgG secretion, thereby helping to preserve B cell tolerance.
Human autoimmune diseases that are characterized by an abnormal production of autoreactive antibodies have been suspected to come along with impaired FcγRIIb function. Alterations of the expression of FcγRIIb on B cells have been shown for Lupus erythematosus and several other autoimmune diseases, but until now, data have been lacking for rheumatoid arthritis. (more…)
Biomarkers are the key to prevention and early detection of disease …
… of this I am convinced. And I am firmly convinced that laboratory diagnostics and the use of biomarkers will have a critical effect on the medicine of tomorrow.
Why am I so sure of this? It has already been demonstrated that biomarkers can be used to optimize treatment for individual patients with diabetes. In the future, individualized medicine (also sometimes called “personalized medicine”) will not only significantly increase the efficiency of treatment; it will also greatly improve prevention and early detection. Today it is already possible to carry out a diagnosis in the symptom-free phase of a disease by using biomarkers. This is of great benefit to the patients who receive early and targeted treatment. (more…)
Rheumatism affects more than just the joints: the heart and circulatory system are also at risk!The knowledge gradually sinks in, even for patients: inflammatory rheumatic diseases like rheumatoid arthritis (RA) not only damage the joints, but also the blood vessels. Patients with rheumatism thus have an increased risk of suffering a heart attack or stroke.
Why is this the case? Rheumatoid arthritis (RA) not only causes inflammation of the musculoskeletal system; it also affects the walls of blood vessels. In addition, RA patients have an increased incidence of hardening of the arteries, arteriosclerosis. “These patients have a 30 to 60 % higher risk of suffering a heart attack or stroke.”
These figures are given by Professor Dr. med. Jürgen Braun, Medical Director of the Ruhr Centre for Rheumatism in Herne, Germany (Rheumazentrum Ruhrgebiet). (These figures and excerpts, and those that follow, were published by the German Society of Rheumatology- Deutsche Gesellschaft für Rheumatologie, DGRh, in the run-up to the 38th Congress of the DGRh (38. Kongress der Deutschen Gesellschaft für Rheumatologie e.V.), which is currently underway in Hamburg.) Prof. Jürgen Braun adds, “The danger increases further when patients have elevated lipid levels, high blood pressure or diabetes, or are overweight.” (more…)
New ACR/EULAR 2010 Classification Criteria for Rheumatoid Arthritis (RA)
European and American rheumatologists have established new criteria for the classification of rheumatoid arthritis (RA). The Revised Classification Criteria for Rheumatoid Arthritis will appear in the September issue of Arthritis & Rheumatism; they can also be viewed online or as a free download at the ACR homepage (accessed 23/08/2010). (more…)
Are RA-specific ACPAs formed directly within inflamed joints?
Antibodies against mutated citrullinated vimentin (anti-MCV) and cyclic citrullinated peptides (anti-CCP) in the serum of RA patients act as highly specific indicators of rheumatoid arthritis. In addition, these antibodies indicate whether the disease is progressing aggressively. In contrast to the CCP antibodies, the anti-MCV antibodies seem to have pathogenic significance.
Earlier studies showed that the anti-CCP titre is higher in the synovial fluid of RA patients than in their serum. This study was intended to demonstrate that this is also true of anti-MCV antibodies and antibodies against other citrullinated proteins. (more…)