TY - JOUR ID - 45567 TI - Immunogenic Evaluation of Bivalent Vaccine Candidate against Enterohemorrhagic and Enterotoxigenic Escherichia coli JO - Iranian Journal of Immunology JA - IJI LA - en SN - 1735-1383 AU - Karimi Rahjerdi, Ahmad AU - Jafari, Mahyat AU - Motamedi, Mohammad Javad AU - Amani, Jafar AU - Salmanian, Ali Hatef AD - Department of Plant Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran AD - Green Gene Company, Tehran, Iran AD - Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran Y1 - 2019 PY - 2019 VL - 16 IS - 3 SP - 200 EP - 211 KW - EHEC KW - ETEC KW - Recombinant Vaccine DO - 10.22034/iji.2019.80271 N2 - Background: Caused by bacterial, viral, and parasitic pathogens, diarrhea is the second leading cause of death among children under five. Two strains of E. coli, namely Enterotoxigenic, ETEC and Enterohemorrhagic EHEC are the most important causes of this disease in developing countries. EHEC is a major causative agent of bloody diarrhea and hemorrhagic uremic syndrome, while ETEC is the most important cause of diarrhea in neonates and travelers. Objective: To evaluate the immunologic properties of a subunit vaccine candidate comprising the main immunogenic epitopes from these two bacterial strains. Methods: The construct comprised of LTB and CfaB antigens from ETEC, and Intimin and Stx2B antigens from EHEC, was designed, analyzed and synthesized using bioinformatics methods. The chimeric gene was sub-cloned in the expression vector and expressed in E. coli host. The purified chimera protein was injected subcutaneously into the experimental animals. The production of specific antibodies was confirmed by immunological methods, and the protection capacity was evaluated by the challenge of immunized mice with the pathogenic bacteria. Results: Chimeric recombinant protein was able to increase IgG titer. Neutralization assay indicated that the antibodies generated against LtB moiety were able to neutralize ETEC toxin. In animal challenge study, all non-immune mice died within 3 days after the injection of toxin, but all immunized mice survived from Stx toxin. Conclusion: The immunity to both ETEC and EHEC bacteria is significant, and this structure can be considered as a candidate for vaccine production against these bacterial strains. UR - https://iji.sums.ac.ir/article_45567.html L1 - https://iji.sums.ac.ir/article_45567_9a18ed88e5385028003153f5847334e1.pdf ER -