
根皮素通过靶向多聚磷酸激酶1降低鲍曼不动杆菌体内外毒力和持留性
吕红发, 李淑芳, 关键, 张鹏, 孔令聪, 马红霞, 李丹, 邓旭明, 牛效迪, 王建锋
工程(英文) ›› 2024, Vol. 43 ›› Issue (12) : 258-271.
根皮素通过靶向多聚磷酸激酶1降低鲍曼不动杆菌体内外毒力和持留性
Phloretin Targets Polyphosphate Kinase 1 to Attenuate Acinetobacter baumannii Virulence and Persistence In Vitro and In Vivo
鲍曼不动杆菌因其毒力和持留性常造成严重性感染,特别是在医院的重症监护病房中。随着耐药菌的出现,如今迫切需要开发抗鲍曼不动杆菌感染的新策略和候选化合物。多聚磷酸盐激酶1(PPK1)参与维持细菌抗生素耐药性或耐受性、致病力和逆境生存,是细菌逆境生存所必需的。本研究通过鲍曼不动杆菌毒力和持久性相关的多项表型试验分析,发现根皮素能通过抑制PPK1活性降低鲍曼不动杆菌的毒力和持留性。根皮素降低其滑行运动能力,抑制生物被膜的形成,降低其对氨苄青霉素刺激、热刺激和过氧化氢刺激的抗性。分子模拟和定点突变试验显示,根皮素与PPK1的结合位点是ARG-22、MET-622、ASN57和ARG-65。同时,根皮素处理导致鲍曼不动杆菌的毒力和持留性相关代谢途径发生变化,包括甘油磷脂代谢和脂肪酸生物合成。此外,在小鼠肺炎感染模型中,根皮素能降低鲍曼不动杆菌在肺部的菌载量以缓解小鼠肺炎损伤。这表明具有较高应用前景的根皮素能靶向PPK1抗鲍曼不动杆菌感染。
Acinetobacter baumannii (A. baumannii) is well known for its virulence and persistence, particularly in intensive care units. Therefore, new strategies and candidates to treat A. baumannii infection are urgently needed considering the emergence of drug-resistant bacteria. Polyphosphate kinase 1 (PPK1) is required for bacterial survival as it is involved in maintaining antibiotic resistance or tolerance, pathogenesis, and adversity resistance. Multiple phenotypic assays related to virulence and persistence were performed in this study, and phloretin was shown to attenuate A. baumannii virulence and persistence by inhibiting PPK1 activity. Phloretin hampered mobility, interfered with biofilm formation and decreased resistance to ampicillin, heat, and hydrogen peroxide stress in A. baumannii. The therapeutic effect was also examined in a mouse pneumonia infection model. Molecular simulation and site-directed mutagenesis revealed that ARG-22, MET-622, ASN-57, and ARG-65 were the sites of phloretin action against PPK1. Phloretin treatment led to changes in metabolic pathways associated with A. baumannii virulence and persistence, including glycerophospholipid metabolism and fatty acid biosynthesis. Furthermore, phloretin alleviated pneumonic injury in a mouse pneumonia infection model in vivo, indicating that phloretin is a promising compound for preventing A. baumannii infection resistance by targeting PPK1.
Acinetobacter baumannii / Virulence / Persistence / Phloretin / Polyphosphate kinase
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