A controllable bacterial lysis system to enhance biological safety of live attenuated Vibrio anguillarum vaccine. Issue 2 (August 2015)

• Record Type: Journal Article
• Authors: Chu, Teng; Guan, Lingyu; Shang, Pengfei; Wang, Qiyao; Xiao, Jingfan; Liu, Qin; Zhang, Yuanxing
• Is Part Of: Fish & shellfish immunology. Volume 45:Issue 2(2015:Aug.)
• Page Start: 742
• Page End: 749
• Publication Date: 2015-08
• Subjects: Fishes -- Immunology -- Periodicals; Shellfish -- Immunology -- Periodicals; Poissons -- Immunologie -- Périodiques; Crustacés -- Immunologie -- Périodiques; 571.9617
• DOI: 10.1016/j.fsi.2015.05.030
• Languages: English
• ISSNs: 1050-4648

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">Bacterial strains used as backbone for the generation of vaccine prototypes should exhibit an adequate and stable safety profile. Given the fact that live attenuated vaccines often contain some potential risks in virulence recovery and spread infections, new approaches are greatly needed to improve their biological safety. Here, a critically iron-regulated promoter P<sub><italic>viuA</italic></sub> was screened from <italic>Vibrio anguillarum</italic>, which was demonstrated to respond to iron-limitation signal both <italic>in vitro</italic> and <italic>in vivo</italic>. By using P<sub><italic>viuA</italic></sub> as a regulatory switch to control the expression of phage P22 lysis cassette <italic>13</italic>-<italic>19</italic>-<italic>15</italic>, a novel <italic>in vivo</italic> inducible bacterial lysis system was established in <italic>V. anguillarum</italic>. This system was proved to be activated by iron-limitation signals and then effectively lyse <italic>V. anguillarum</italic> both <italic>in vitro</italic> and <italic>in vivo</italic>. Further, this controllable bacterial lysis system, after being transformed into a live attenuated <italic>V</italic>. <italic>anguillarum</italic> vaccine strain MVAV6203, was confirmed to significantly improve biological safety of the live attenuated vaccine without impairing its immune protection efficacy.</p> </sec> </abstract>