Effects of tobacco smoke on the expression of virulence genes in Escherichia coli

Abstract

It is widely acknowledged that smoking exacerbates the severity of infectious diseases. A presumed mechanism involves the damage inflicted by tobacco smoke on the organs of host organisms. In this study, an alternative hypothesis was explored: smoking enhances the virulence of bacteria. This possibility was investigated using <i>Escherichia coli</i> as the model bacteria and <i>Drosophila</i> as the host organism. Our inquiry focused on the potential gene expression changes in <i>E. coli</i> subsequent to exposure to tobacco smoke extracts. Analysis of the transcription promoter activity of genes encoding proteins within the <i>E. coli</i> two-component system, a regulatory machinery governing gene expression, revealed the suppression of thirteen out of 23 promoters in response to tobacco smoke extracts. Subsequently, <i>Drosophila</i> was infected with <i>E. coli</i> exposed to tobacco smoke extracts or left untreated. Interestingly, there were no significant differences observed in the survival periods of <i>Drosophila</i> following infection with <i>E. coli</i>, whether treated or untreated with tobacco smoke extracts. Contrary to the initial hypothesis, the findings suggest that while tobacco smoke extracts alter gene expression in <i>E. coli</i>, these changes do not appear to impact bacterial virulence. Although this study has illuminated the influence of tobacco smoke extracts on the gene expression of <i>E. coli</i>, further analyses are necessary to elucidate the implications of these changes. Nevertheless, the results imply that smoking affects not only host organisms but may also exert influence on invading bacteria.

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