The emergence of bacterial strains that are resistant to antibiotics is a growing threat in the clinical environment, but people do not quite understand the process of their emergence. Experiments with a continuous culture of E. coli exposed to increasing concentrations of the fluoroquinolone antibacterial drug "norfloxacin" showed that a few naturally occurring drug-resistant variants can protect most of its population. These highly drug-resistant isolates produce the signal-acting molecule "indole", which can stimulate drug efflux pumps and other protective mechanisms in susceptible skin.
This altruistic behavior allows the weaker component to survive and has the opportunity to make beneficial mutations. More research on the use of bacterial intracellular communication may prove to be valuable for the rational design of clinical interventions to control drug-resistant bacterial infections.
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