Hans-Joachim Anders, Detlef O. Schlondorff  Kidney International 

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Innate immune receptors and autophagy: implications for autoimmune kidney injury  Hans-Joachim Anders, Detlef O. Schlondorff  Kidney International  Volume 78, Issue 1, Pages 29-37 (July 2010) DOI: 10.1038/ki.2010.111 Copyright © 2010 International Society of Nephrology Terms and Conditions

Figure 1 Immune recognition of extrinsic and intrinsic dangers. Pathogens release pathogen-associated molecular patterns (PAMPs) that activate antigen-presenting cells (APCs) and nonimmune cells through pattern recognition receptors. The maturation of, e.g., APC-like dendritic cells leads to antigen presentation in the presence of costimulatory molecules that set off adaptive immune responses involving clonal expansion of antigen-specific T and B cells. Necrotic cells release intracellular molecules that can activate the same classes of immune receptors and thereby act as danger-associated molecular patterns (DAMPs). This mechanism can explain sterile types of inflammation that present clinically like infectious diseases such as a gout attack (DAMP=uric acid crystal) or postischemic tissue inflammation. In SLE nuclear particles containing immunostimulatory nucleic acids function as adjuvant-like DAMPs in addition to their role as autoantigens. Apoptotic cell death avoids DAMP release and inappropriate immune activation. Vice versa, genetic defects in apoptosis or the rapid clearance of apoptotic cells by phagocytes predispose to chronic inflammatory autoimmune diseases such as SLE because secondary necrosis of apoptotic cells causes DAMP release. Kidney International 2010 78, 29-37DOI: (10.1038/ki.2010.111) Copyright © 2010 International Society of Nephrology Terms and Conditions

Figure 2 Schematic illustration of macro-, micro-, and chaperone-mediated autophagy and the formation of autolysosomes. Under normal conditions and in the presence of growth factors, PI3 kinase will be active and stimulate TOR (target of rapamycin), which will inhibit ATGs and thereby autophagy. Decreased PI3 kinase activity would result in less TOR activity, less ATG inhibition, and enhanced autophagy. Rapamycin as an inhibitor of TOR would also activate ATGs and thereby autophagy. Kidney International 2010 78, 29-37DOI: (10.1038/ki.2010.111) Copyright © 2010 International Society of Nephrology Terms and Conditions