Disputationer Disputation: Shailesh Kumar Samal

Our immune system is an important and central part of the defence mechanisms of our body. It carries out various important functions such as protecting us from invading microorganisms, removing dead cells, and producing antibodies for future defence. For this, proper synchronization between the innate and adaptive immunity is required. Our innate immune system acts as the first line of defence by eliminating non-specifically various pathogens and by activating antigen-presenting cells (APCs) that inform B-cells and T-cells of the adaptive immune system. B-cells can exhibit more specific actions against pathogens by an intricately regulated production of antibodies directed against antigens expressed by the pathogens. T-cells can produce cytokines and chemokines to alarm the complete immune system recruiting immune cells such as natural killer cells, mast cells and neutrophils. The immune system can also produce antibodies against self-antigens (autoantibodies). Autoantibodies can have pathogenic effects that cause autoimmune diseases such as Systemic Lupus Erythematosis. Interestingly, it has been shown recently that autoantibodies can also have protective effects alleviating diseases such as lupus nephritis and atherosclerosis. This thesis focuses specifically on homeostatic functions of the human autoantibodies anti-phoshorylcholine (anti-PC) and anti-malondialdehyde (anti-MDA) and their prevalence in cardiovascular disease (CVD) and chronic kidney disease (CKD).