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Clay nanoparticles co-deliver three antigens to promote potent immune responses against pathogenic Escherichia coli.
Journal of Controlled Release 2018 November 8
Currently, there are few strategies for controlling pathogenic bacteria, especially the pathotypes of Escherichia coli which are an emerging threat to public health worldwide. Here, multivalent vaccine formulations are reported for control of pathogenic E. coli. The formulations utilised clay nanoparticles, either layered double hydroxides (LDH) or hectorite (HEC), to complex with a cocktail of three recombinant antigens, intimin β (IB), proprietary antigen 1 (PAg1) and proprietary antigen 2 (PAg2). Acting as nano-adjuvants, LDH and HEC were able to stimulate strong, durable and balanced immune responses in mice. Moreover, LDH-IB-PAg1-PAg2 and HEC-IB-PAg1-PAg2 immunised mice developed potent mucosal immune responses and efficiently prevented adherence of enterohemorrhagic E. coli serotype O26 to mammalian cells. Notably, the multi-faceted immune responses elicited by the clay nanoparticle formulations were significantly higher than those induced by a QuilA formulation, without antigenic competition observed for the first time. The results of this study suggest that LDH and HEC offer considerable promise as effective multivalent vaccine carriers against important pathogens such as enteropathogenic E. coli.
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