Friends or enemies? The complicated relationship between Pseudomonas aeruginosa and Staphylococcus aureus
- PMID: 33576132
- DOI: 10.1111/mmi.14699
Friends or enemies? The complicated relationship between Pseudomonas aeruginosa and Staphylococcus aureus
Abstract
Pseudomonas aeruginosa (Pa) and Staphylococcus aureus (Sa) are opportunistic pathogens that are most commonly co-isolated from chronic wounds and the sputum of cystic fibrosis patients. Over the last few years, there have been plenty of contrasting results from studies involving P. aeruginosa and S. aureus co-cultures. The general concept that P. aeruginosa outcompetes S. aureus has been challenged and there is more evidence now that they can co-exist. Nevertheless, it still remains difficult to mimic polymicrobial infections in vitro and in vivo. In this review, we discuss recent advances in regard to Pa-Sa molecular interactions, their physical responses, and in vitro and in vivo models. We believe it is important to optimize growth conditions in the laboratory, determine appropriate bacterial starting ratios, and consider environmental factors to study the co-existence of these two pathogens. Ideally, optimized growth media should reflect host-mimicking conditions with or without host cells that allow both bacteria to co-exist. To further identify mechanisms that could help to treat these complex infections, we propose to use relevant polymicrobial animal models. Ultimately, we briefly discuss how polymicrobial infections can increase antibiotic tolerance.
Keywords: animal models; antibiotic tolerance; biofilms; chronic wounds; cystic fibrosis; host-mimicking conditions; polymicrobial interactions.
© 2021 John Wiley & Sons Ltd.
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