文献类型：期刊文献

英文题名：The CpxA-CpxR two-component system regulates stress tolerance and virulence of Vibrio alginolyticus

作者：Zhang, Yilin[1,2]; Kang, Xu[1,2]; Wu, Fan[1,2]; Lu, Yishan[1,2]; Gan, Zhen[1,2]

机构：[1] Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy culture, and Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institute, College of Fishery, Guangdong Ocean University, Zhanjiang, 524088, China; [2] Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, and Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, 518120, China

年份：2025

卷号：312

外文期刊名：International Journal of Biological Macromolecules

收录：EI(收录号：20252018428331)、Scopus(收录号：2-s2.0-105004998405)

语种：英文

外文关键词：Cell adhesion - Transcription

外文摘要：The two-component systems (TCSs) play vital roles in the regulation of a series of biological processes in bacteria, and the CpxA-CpxR is considered as a kind of classical TCSs involved in bacterial envelope stress responses. However, the roles of the CpxA-CpxR are not sufficiently understood in Vibrio alginolyticus, a serious pathogen causing the outbreak of pathogenic diseases vibriosis in marine fishes. In this study, we examined the effect of cpxA and cpxR deletion on typical phenotypes of V. alginolyticus HY9901, and the result showed that deletion of cpxA and cpxR and increased the susceptibility to high salinity, iron limitation, certain antibiotics (kanamycin and midecamycin), but had no effects on growth curve and swarming motility of V. alginolyticus. Besides, deletion of cpxA (not cpxR) decreased biofilm formation of V. alginolyticus. In addition, the stimulation of ΔcpxA and ΔcpxR significantly up-regulated the expression of immune-related genes in grouper spleen (GS) cells compared to WT, and deletion of cpxA and cpxR decreased the bacterial adhesion and intracellular ferrous iron concentration in GS cells, and increased the viability of infected-GS cells. Consistently, deletion of cpxA and cpxR decreased bacterial invasion and intracellular replication in grouper primary macrophages. The present study thus improves the understanding of the functions of the CpxA-CpxR system in gamma proteobacteria, and also provides new insight into the molecular pathogenesis of vibriosis in marine fishes. ? 2025