2008 April | Hajime Kono, M.D. Ph.D and Kenneth L. Rock, M.D.
The immune system detects and responds to cell death through danger signals called DAMPs (damage-associated molecular patterns). When cells die, especially through necrosis, they release DAMPs that alert the innate immune system, triggering inflammation and activating adaptive immune responses. This process is crucial for host defense and disease pathogenesis. The danger hypothesis, proposed by Matzinger, suggests that the adaptive immune system responds to non-physiological cell death, damage, or stress, not just infections. DAMPs, such as HMGB1, uric acid, and genomic DNA, are released from dying cells and act as endogenous adjuvants, enhancing immune responses. These molecules can stimulate antigen-presenting cells (APCs) to mature and migrate to lymphoid tissues, promoting T-cell immunity. DAMPs also induce inflammatory responses by activating complement and other pathways, which can lead to tissue damage and disease. The mechanisms by which DAMPs are recognized by the immune system involve various receptors, including TLRs and RAGE. Understanding these processes is essential for developing therapies to treat autoimmune and inflammatory diseases. The study highlights the complexity of DAMP signaling and the need for further research to elucidate their roles in health and disease.The immune system detects and responds to cell death through danger signals called DAMPs (damage-associated molecular patterns). When cells die, especially through necrosis, they release DAMPs that alert the innate immune system, triggering inflammation and activating adaptive immune responses. This process is crucial for host defense and disease pathogenesis. The danger hypothesis, proposed by Matzinger, suggests that the adaptive immune system responds to non-physiological cell death, damage, or stress, not just infections. DAMPs, such as HMGB1, uric acid, and genomic DNA, are released from dying cells and act as endogenous adjuvants, enhancing immune responses. These molecules can stimulate antigen-presenting cells (APCs) to mature and migrate to lymphoid tissues, promoting T-cell immunity. DAMPs also induce inflammatory responses by activating complement and other pathways, which can lead to tissue damage and disease. The mechanisms by which DAMPs are recognized by the immune system involve various receptors, including TLRs and RAGE. Understanding these processes is essential for developing therapies to treat autoimmune and inflammatory diseases. The study highlights the complexity of DAMP signaling and the need for further research to elucidate their roles in health and disease.