Bacillus methylotrophicus influences on the virulence of Aeromonas hydrophila and probiotic applications in Ctenopharyngodon idella

Autor: Tahir Ali Khan, Zirong Zhu, Dalal Sulaiman Alshaya, Pan Luo, Kotb A. Attia, Uzair Muhammad, Jie Rang, Shengbiao Hu, Liqiu Xia
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Aquaculture Reports, Vol 39, Iss , Pp 102440- (2024)
Druh dokumentu: article
ISSN: 2352-5134
DOI: 10.1016/j.aqrep.2024.102440
Popis: Probiotics are alternatives to antibiotics that resist infection and benefit the host in several aspects. Here, we isolated and identified a novel strain of Bacillus methylotrophicus (XA-8) with a broad spectrum of activity against Aeromonas hydrophila AhX040 and other aquatic bacterial pathogens. The strain was non-pathogenic as it revealed no cytotoxic effects in hepatic L8824 cells or pathophysiological signs in the tissue of Ctenopharyngodon idella (grass carp). Using a co-culture approach, XA-8 (1×109 CFU mL−1) when co-cultivated with AhX040 (1×108 CFU mL−1) revealed a reduction in the cell density, cytotoxicity, and infection rate of AhX040. More interestingly, genes such as aer, act, hylA, lafA, hcp, and luxS, associated with the virulence of AhX040, were significantly down-regulated during co-cultivation (P
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