University of Queensland study reveals mitochondria's antibacterial role against superbugs
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University of Queensland-led international research published in Science Immunology has demonstrated that mitochondria, known as cellular energy producers, also serve as a potent antibacterial defense. When faced with bacterial threats like E. coli, mitochondria rapidly divide, triggering antimicrobial lipid droplets that eliminate the pathogens. The study found that blocking this division allows bacteria to proliferate, while promoting it clears infections.
The Fission Defense Mechanism
The study, involving scientists from Switzerland and Spain alongside the University of Queensland, found that mitochondrial fission is an evolutionarily conserved immune response. Dr. Ronan Kapetanovic of the research team noted that this mechanism exists from simple worms to mammals and humans. Experiments with E. coli-infected cells showed that inhibiting mitochondrial division led to rapid bacterial growth, whereas enhancing fission successfully cleared the bacteria.
Salmonella's Subversion and HDAC6 Target
While the fission mechanism effectively combats E. coli, the pathogen Salmonella typhimurium was found to suppress mitochondrial division, evading the defense. The researchers discovered that by inhibiting the enzyme HDAC6 with a drug, mitochondrial fission could be reactivated even under Salmonella pressure, restoring the antibacterial shield. This pinpoints HDAC6 as a direct therapeutic target for resistant infections.
Cellular Homeostasis Control
Beyond defense, the study revealed that mitochondria also regulate immune balance to prevent tissue damage. The activation of the stress pathway UPRmt during fission limits excessive immune responses while fighting infections. The findings open new possibilities for drugs that harness the cell's own mechanisms against antibiotic-resistant pathogens.
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