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• W2130793085 endingPage "2005" @default.
• W2130793085 startingPage "1999" @default.
• W2130793085 abstract "ABSTRACT So far attenuation of pathogens has been mainly obtained by chemical or heat treatment of microbial pathogens. Recently, live attenuated strains have been produced by genetic modification. We have previously demonstrated that in several prokaryotes as well as in yeasts and mammalian cells the heat shock response is controlled by the membrane physical state (MPS). We have also shown that in Salmonella enterica serovar Typhimurium LT2 ( Salmonella Typhimurium) overexpression of a Δ 12 -desaturase gene alters the MPS, inducing a sharp impairment of transcription of major heat shock genes and failure of the pathogen to grow inside macrophage (MΦ) (A. Porta et al., J. Bacteriol. 192:1988-1998, 2010). Here, we show that overexpression of a homologous Δ 9 -desaturase sequence in the highly virulent G217B strain of the human fungal pathogen Histoplasma capsulatum causes loss of its ability to survive and persist within murine MΦ along with the impairment of the heat shock response. When the attenuated strain of H. capsulatum was injected in a mouse model of infection, it did not cause disease. Further, treated mice were protected when challenged with the virulent fungal parental strain. Attenuation of virulence in MΦ of two evolutionarily distant pathogens was obtained by genetic modification of the MPS, suggesting that this is a new method that may be used to produce attenuation or loss of virulence in both other intracellular prokaryotic and eukaryotic pathogens. This new procedure to generate attenuated forms of pathogens may be used eventually to produce a novel class of vaccines based on the genetic manipulation of a pathogen's membrane fluid state and stress response." @default.
• W2130793085 created "2016-06-24" @default.
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• W2130793085 date "2010-04-01" @default.
• W2130793085 modified "2023-09-26" @default.
• W2130793085 title "Changes in Membrane Fluid State and Heat Shock Response Cause Attenuation of Virulence" @default.
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• W2130793085 doi "https://doi.org/10.1128/jb.00990-09" @default.
• W2130793085 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2838053" @default.
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