Microbial biofilm extracellular polymeric substance matrix and microbial cell membrane (EPS-CM)

The microbial biofilm extracellular polymeric substance (EPS) matrix and microbial cell membranes represent critical structural barriers that protect pathogenic microorganisms from host immune responses and antibiotic treatment (Flemming & Wingender, 2010, Nature Reviews Microbiology). The EPS matrix is a complex mixture of polysaccharides, proteins, and extracellular DNA that encases microbial communities, facilitating adhesion and providing mechanical stability (Ciofu et al., 2022, Nature Reviews Microbiology). Microbial cell membranes are lipid bilayers that maintain cellular homeostasis and serve as the primary site for many essential metabolic processes (StatPearls, 2023, "Polymyxin B"). Therapeutic strategies targeting these structures aim to either degrade the protective EPS scaffold to enhance drug penetration or directly disrupt the integrity of the cell membrane to induce microbial death (NIH, 2023, "Dornase Alfa"). These targets are particularly relevant in chronic infections, such as those found in cystic fibrosis or on medical implants, where traditional antibiotics often fail due to poor penetration and the presence of persistent cells. By targeting the physical architecture of the biofilm and the fundamental integrity of the cell, these agents can overcome multi-drug resistance mechanisms.

Other names

Biofilm matrixExtracellular polymeric substancesEPSBacterial cell membraneMicrobial envelope

Drugs targeting these structures typically act by enzymatically degrading the EPS components, such as extracellular DNA or polysaccharides, or by physically disrupting the lipid bilayer of the cell membrane through detergent-like effects or pore formation (Flemming & Wingender, 2010; StatPearls, 2023).