Anthocyanin Extract from Purple Sweet Potato Exacerbate Mitophagy to Ameliorate Pyroptosis in Klebsiella pneumoniae Infection

• Published in: International journal of molecular sciences Vol. 22; no. 21; p. 11422
• Main Authors: Dong, Guokai, Xu, Nana, Wang, Meng, Zhao, Yunyun, Jiang, Fei, Bu, Huimin, Liu, Jinjuan, Yuan, Bo, Li, Rongpeng
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 22.10.2021; MDPI
• Subjects: Alveoli; Animals; Anthocyanins; Anthocyanins - analysis; Anthocyanins - chemistry; Anthocyanins - pharmacology; Antibiotics; Bacterial infections; Cell activation; Cell Line; Defense; Disease Models, Animal; DNA, Mitochondrial - genetics; Female; Flavonoids; Heat resistance; Infections; Infectious diseases; Inflammasomes; Inflammation; Inflammation - drug therapy; Injury prevention; Ipomoea batatas - chemistry; Klebsiella; Klebsiella Infections - drug therapy; Klebsiella pneumoniae; Klebsiella pneumoniae - drug effects; Klebsiella pneumoniae - metabolism; Klebsiella pneumoniae - pathogenicity; Lung Injury - drug therapy; Lung Injury - prevention & control; Lungs; Macrophages; Macrophages, Alveolar - immunology; Macrophages, Alveolar - microbiology; Membrane potential; Membrane Potential, Mitochondrial - drug effects; Mice; Mice, Inbred C57BL; Mitochondria; Mitochondrial DNA; mitophagy; Mitophagy - drug effects; Morbidity; Mortality; Natural products; Neutrophils; NF-E2-Related Factor 2 - metabolism; NLR Family, Pyrin Domain-Containing 3 Protein - metabolism; NLRP3 inflammasome; Pathogens; Plant Extracts - pharmacology; Pneumonia; Potatoes; purple sweet potato anthocyanins PSPAs; Pyroptosis; Pyroptosis - drug effects; Reactive Oxygen Species - metabolism; Signal transduction; Sweet potatoes; Vaccines; pyroptosis; mitophagy; NLRP3 inflammasome; Klebsiella pneumoniae; purple sweet potato anthocyanins PSPAs
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms222111422

Given the rise of morbidity and mortality caused by (KP), the increasing number of strains resistant to antibiotics, and the emergence of , treatment of KP infection becomes difficult; thus, novel drugs are necessary for treatment. Anthocyanins, or natural flavonoids, have an extensive effect against bacterial infection. However, few studies on anti-KP are identified. Here, we evaluated the therapeutic effect of purple sweet potato anthocyanins (PSPAs) on KP, containing 98.7% delphinidin 3-sambubioside. Results showed that KP-infected mice after PSPAs treatment manifested decreased mortality, weakened lung injury, dampened inflammatory responses, and reduced bacterial systemic dissemination in vivo. In Vitro, PSPAs significantly suppressed pyroptosis and restricted NLRP3 inflammasome activation in alveolar macrophages infected with KP. As for the mechanism, PSPAs promote mitophagy by recruiting Parkin to the mitochondria. PSPAs-conferred mitophagy increased mitochondrial membrane potential and decreased mitochondrial reactive oxygen species and mitochondrial DNA, resulting in impaired NLRP3 inflammasome activation. In addition, the promotion of mitophagy by PSPAs required the Nrf2 signaling pathway. Collectively, these findings suggest that PSPAs are a potential option for the treatment of KP infection.