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- W4313405093 abstract "The balance of the attenuation and reactogenicity is an issue in the development of recombinant attenuated Salmonella vaccines (RASV). Some reactogenic strains produced side effects are partially induced by lipid A. As reported, the number of lipid A acyl chains influence the strength and outcome of immune responses. However, there is rarely any study to investigate the modifications of acyl chain length on the effect of the toxicity and immunogenicity in Salmonella. In this study, foreign acyltransferase genes lpxA and lpxD were introduced into S. Typhimurium, which produced the S006 (ΔaraBAD::PlppCtlpxAC10) or S007 (ΔproBA::PlppSslpxDC16) strains with C10 or C16 acyl chains respectively. The results showed that the increased polymyxin B susceptibility, reduced swimming and invasion capabilities were observed in the S006. In addition, it also exhibited a lower endotoxicity and colonization ability compared to the parent strain. The result indicated the introduction of C10 acyl chains could be as a candidate choice for lipid A detoxifying strategy in engineering bacteria. However, the longer acyl chain modification didn’t obviously change these abilities. Parallelly, these modifications were introduced into a Salmonella vaccine strain to determine their influences on the immune responses against Pneumonia. After inoculation by the strain V003 (ΔaraBAD ΔproBA::PlppSslpxDC16 χ9241), the mice produced robust levels of anti-PspA IgG, and a balanced Th1/Th2 immunity, which resulted in a significant survival improvement of mice with challenging against Streptococcus pneumonia. Therefore, the combination of lipid A modification with C16 acyl chain may be a better strategy for the development of ideal RASVs." @default.
- W4313405093 created "2023-01-06" @default.
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- W4313405093 date "2023-01-01" @default.
- W4313405093 modified "2023-10-16" @default.
- W4313405093 title "Reducing the endotoxic activity or enhancing the vaccine immunogenicity by altering the length of lipid A acyl chain in Salmonella" @default.
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- W4313405093 doi "https://doi.org/10.1016/j.intimp.2022.109575" @default.
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