Biofilms and their properties

Valen, Håkon; Scheie, Anne Aamdal

doi:10.1111/eos.12425

Cited by 33 publications

(30 citation statements)

References 71 publications

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“…They emphasized that the most relevant effects of this yeast on the faecal microbiota composition are the increasing of short-chain fatty acid-producing bacteria, mainly Lachnospiraceae and Ruminococcaceae , but also the increasing of Bacteroidaceae and Prevotellaceae . Additionally, suppression of pioneer bacteria was observed (they are the bacteria that have direct contact with the pellicle surface) [ 14 , 34 ]. Due to anti-inflammatory, anti-secretion, pro-migratory, and adhesion effects, S. boulardii CNCM I-745 restores intestinal barrier function [ 35 ].…”

Section: The Effects Of S Boulardii On Intestinalmentioning

confidence: 99%

Saccharomyces boulardii CNCM I-745: A Non-bacterial Microorganism Used as Probiotic Agent in Supporting Treatment of Selected Diseases

Kaźmierczak-Siedlecka

Ruszkowski

Fic

et al. 2020

Curr Microbiol

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The yeast Saccharomyces boulardii CNCM I-745 is a unique, non-bacterial microorganism classified as a probiotic agent. In this review article, at first, we briefly summarized the mechanisms responsible for its probiotic properties, e.g. adhesion to and elimination of enteropathogenic microorganisms and their toxins; extracellular cleavage of pathogens’ virulent factors; trophic and anti-inflammatory effects on the intestinal mucosa. The efficacy of S. boulardii administration was tested in variety of human diseases. We discussed the results of S. boulardii CNCM I-745 use in the treatment or prevention of Helicobacter pylori infections, diarrhoea ( Clostridium difficile infections, antibiotic-associated diarrhoea, and traveller’s diarrhoea), inflammatory bowel diseases, irritable bowel syndrome, candidiasis, dyslipidemia, and small intestine bacterial overgrowth in patients with multiple sclerosis. In case of limited number of studies regarding this strain, we also presented studies demonstrating properties and efficacy of other strains of S. boulardii. Administration of S. boulardii CNCMI I-745 during antibiotic therapy has certain advantage over bacterial probiotics, because—due to its fungal natural properties—it is intrinsically resistant to the antibiotics and cannot promote the spread of antimicrobial resistance. Even though cases of fungemia following S. boulardii CNCM I-745 administration were reported, it should be treated as a widely available and safe probiotic strain.

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Section: The Effects Of S Boulardii On Intestinalmentioning

confidence: 99%

Saccharomyces boulardii CNCM I-745: A Non-bacterial Microorganism Used as Probiotic Agent in Supporting Treatment of Selected Diseases

Kaźmierczak-Siedlecka

Ruszkowski

Fic

et al. 2020

Curr Microbiol

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“…E. coli expressing type 1 fimbriae was observed to contribute to catheter-associated urinary tract infections in a dynamic catheterized bladder model [ 16 ]. The biofilm may act as a natural barrier, protecting bacteria from antimicrobial treatment [ 17 ], and biofilms are associated with reduced susceptibility towards antimicrobial treatment [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Adhesion of Escherichia Coli to Nanostructured Surfaces and the Role of Type 1 Fimbriae

et al. 2020

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Bacterial fimbriae are an important virulence factor mediating adhesion to both biotic and abiotic surfaces and facilitating biofilm formation. The expression of type 1 fimbriae of Escherichia coli is a key virulence factor for urinary tract infections and catheter-associated urinary tract infections, which represent the most common nosocomial infections. New strategies to reduce adhesion of bacteria to surfaces is therefore warranted. The aim of the present study was to investigate how surfaces with different nanotopography-influenced fimbriae-mediated adhesion. Surfaces with three different nanopattern surface coverages made in polycarbonate were fabricated by injection molding from electron beam lithography nanopatterned templates. The surfaces were constructed with features of approximately 40 nm width and 25 nm height with 100 nm, 250 nm, and 500 nm interspace distance, respectively. The role of fimbriae type 1-mediated adhesion was investigated using the E. coli wild type BW25113 and ΔfimA (with a knockout of major pilus protein FimA) and ΔfimH (with a knockout of minor protein FimH) mutants. For the surfaces with nanotopography, all strains adhered least to areas with the largest interpillar distance (500 nm). For the E. coli wild type, no difference in adhesion between surfaces without pillars and the largest interpillar distance was observed. For the deletion mutants, increased adhesion was observed for surfaces without pillars compared to surfaces with the largest interpillar distance. The presence of a fully functional type 1 fimbria decreased the bacterial adhesion to the nanopatterned surfaces in comparison to the mutants.

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“…Biofilms are masses of microbial cells encased in a self-made matrix of extracellular polymeric substances ( Valen and Scheie, 2018 ). Cells of PGPR, when present in a biofilm, should perform well because of inhibition of competing organisms, nutrient uptake, and improved adaptation to changing environmental conditions ( Seneviratne et al, 2010 ; Backer et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

Quorum Sensing System Affects the Plant Growth Promotion Traits of Serratia fonticola GS2

et al. 2020

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Quorum sensing (QS) enables bacteria to organize gene expression programs, thereby coordinating collective behaviors. It involves the production, release, and population-wide detection of extracellular signaling molecules. The cellular processes regulated by QS in bacteria are diverse and may be used in mutualistic coordination or in response to changing environmental conditions. Here, we focused on the influence of the QS-dependent genes of our model bacterial strain Serratia fonticola GS2 on potential plant growth promoting (PGP) activities including indole-3-acetic acid (IAA) production, 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity, and biofilm formation. Based on genomic and phenotypic experimental data we identified and investigated the function of QS genes in the genome of the model strain. Our gene deletion study confirmed the biological functionality of the QS auto-inducer ( gloI ) and receptor ( gloR ) on potential PGP activities of GS2. A transcriptomic approach was also undertaken to understand the role of QS genes in regulation of genes primarily involved in PGP activities (IAA, ACC deaminase activity, and biofilm formation). Both transcriptomic and phenotypic data revealed that the QS-deletion mutants had considerably less PGP activities, as compared to the wild type. In addition, in vivo plant experiments showed that plants treated with GS2 had significantly higher growth rates than plants treated with the QS-deletion mutants. Overall, our results showed how QS-dependent genes regulate the potential PGP activities of GS2. This information may be helpful in understanding the relationship between QS-dependent genes and the PGP activity of bacteria, which aid in the production of practical bio-fertilizers for plant growth promotion.

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Biofilms and their properties

Cited by 33 publications

References 71 publications

Saccharomyces boulardii CNCM I-745: A Non-bacterial Microorganism Used as Probiotic Agent in Supporting Treatment of Selected Diseases

Saccharomyces boulardii CNCM I-745: A Non-bacterial Microorganism Used as Probiotic Agent in Supporting Treatment of Selected Diseases

Adhesion of Escherichia Coli to Nanostructured Surfaces and the Role of Type 1 Fimbriae

Quorum Sensing System Affects the Plant Growth Promotion Traits of Serratia fonticola GS2

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