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3M’s of Multi-Species Biofilms: Microbial Pathogens, Microenvironments, and Minimalist Laboratory Approaches to Study Multi-Species Biofilms Under Microenvironmental Conditions

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Multispecies Biofilms

Abstract

Multi-species bacterial and fungal communities of microbial aggregates, commonly known as biofilms, are associated with difficult-to-treat, chronic infections. These infection states are typically characterized by interactions between multiple biofilm-forming pathogens, as well as interactions of pathogens with the host microenvironment. Together, this dynamic interplay affects the progression and therapeutic outcome of the multi-species biofilm infection state, and underscores the importance of studying multi-species biofilms in the context of the complex host microenvironment. In this chapter, we review the multi-species status of important chronic infection states, including non-healing wounds, lung infections, oral and dental infections, suppurative otitis media, urinary tract infections, and medical device-associated infections. Further, we discuss the role of the host microenvironment in multi-species biofilm infections, with examples highlighting the roles of host factors in the formation, establishment, progression and outcome of these infections. This includes host niche sites, chemical and nutrient factors, immune factors, and biophysical and biomechanical cues. Next, we discuss in vitro laboratory approaches to study multi-species biofilm infections under conditions that closely recapitulate the clinical biofilm infection state. Using the case study of in vitro wound fluid models, we outline the incorporation and refinement of relevant host factors in the development of minimalist wound fluid models, and their applications to study multi-species biofilms in conditions that mimic the wound microenvironment. Finally, we suggest a “bottom-up” approach that can be used to develop in vitro milieu models for a range of infection states. While not all inclusive of the complex infection microenvironment, minimalist in vitro milieu models are a step forward from reductionist laboratory approaches, and could provide host-relevant insights into laboratory biofilm studies.

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Author Contributions

Anoushka Gholap: Writing the original draft, Preparation of figures. Snehal Murumkar: Writing the original draft, Preparation of figures. Meetali Barhate: Writing the original draft, Preparation of figures. Radhika Dhekane: Writing the original draft. Nijamuddin Shaikh: Writing the original draft. Deepti Bandaru: Writing the original draft. Rutuja Ugale: Writing the original draft. Utkarsha Tikhole: Writing the original draft. Snehal Kadam: Writing the original draft. Vandana Madhusoodhanan: Writing the original draft. Karishma S Kaushik: Conceptualization, Project administration, Supervision, Writing the original draft, Finalizing draft, Editing draft.

Funding

Karishma S Kaushik’s academic appointment is funded by the Ramalingaswami Re-entry Fellowship (BT/HRD/35/02/2006). Snehal Kadam and Nijamuddin Shaikh were supported for a select duration of this work on the Ramalingaswami Re-entry Fellowship (to KSK). Radhika Dhekane is funded by the Innovative Young Biotechnologist Award (BT/12/IYBA/2019/05 to KSK). Deepti Bandaru is a paid consultant with Centre for Health, Research and Education, Southampton, United Kingdom.

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Correspondence to Karishma S. Kaushik .

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Dhekane, R. et al. (2023). 3M’s of Multi-Species Biofilms: Microbial Pathogens, Microenvironments, and Minimalist Laboratory Approaches to Study Multi-Species Biofilms Under Microenvironmental Conditions. In: Kaushik, K.S., Darch, S.E. (eds) Multispecies Biofilms. Springer Series on Biofilms, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-031-15349-5_1

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