Catecholamine-Stimulated Growth of Aeromonas hydrophila Requires the TonB2 Energy Transduction System but Is Independent of the Amonabactin Siderophore
文献类型： 外文期刊
作者： Dong, Yuhao 1 ; Liu, Jin 1 ; Pang, Maoda 1 ; Du, Hechao 1 ; Wang, Nannan 1 ; Awan, Furqan 1 ; Lu, Chengping 1 ; Liu, Yong 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Vet Med, Dept Prevent Vet, Nanjing, Jiangsu, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Food Safety, Jiangsu Prov State Key Lab Breeding Base, Key Lab Food Qual & Safety, Nanjing, Jiangsu, Peoples R China
关键词： Aeromonas hydrophila;stress;catecholamine;TonB2 energy transduction system;amonabactin
期刊名称：FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY （ 影响因子：5.293； 五年影响因子：5.882 ）
ISSN： 2235-2988
年卷期： 2016 年 6 卷
页码：
收录情况： SCI
摘要： The growth-stimulating effects of catecholamine stress hormones have been demonstrated in many pathogens. However, catecholamine-induced growth and its underlying mechanisms remain poorly understood in Aeromonas hydrophila . The present study sought to demonstrate that norepinephrine (NE), epinephrine (Epi), dopamine (Dopa), and L-dopa stimulate the growth of A. hydrophila in iron-restricted media containing serum. NE exhibited the strongest growth stimulation, which could be blocked by adrenergic antagonists. Furthermore, it was demonstrated that NE could sequester iron from transferrin, thereby providing a more accessible iron source for utilization by A. hydrophila . The deletion of the amoA gene associated with amonabactin synthesis revealed that the amonabactin siderophore is not required for NE-stimulated growth. However, the deletion of the TonB2 energy transduction system resulted in the loss of growth promotion by NE, indicating that a specific TonB-dependent outer membrane receptor might be involved in the transport of iron from transferrin. Collectively, our data show that catecholamine sensing promotes the growth of A. hydrophila in a manner that is dependent on the TonB2 energy transduction system
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