This article in Nature, details the concept that a breakdown in the endosymbiotic relationship between mitochondria and the host cell may be a foundational cause of inflammatory and autoimmune diseases. Mitochondria, retaining traits from their bacterial origin, can release various factors—including proteins, nucleic acids (mtDNA/mtRNA), metabolites, and reactive oxygen species (ROS)—into the cytosol when their protective outer membrane is breached. The text explains that the cell can recognize these mitochondrial factors as "foreign" or danger signals, triggering innate immune responses like inflammation and cell death pathways, often mirroring the mechanisms used to detect bacterial or viral pathogens. The authors hypothesize that modern environmental factors like obesity, dietary changes, and chronic stress may drive this mitochondrial dysfunction and subsequent inflammatory signaling, suggesting new avenues for therapeutic intervention.
References:
- Murphy M P, O’Neill L A J. A break in mitochondrial endosymbiosis as a basis for inflammatory diseases[J]. Nature, 2024, 626(7998): 271-279.