scholarly journals A quantitative method to assess bacterial adhesion using recombinant bioluminescent Pseudomonas aeruginosa

2021 ◽  
Vol 7 (1) ◽  
pp. 1-16
Author(s):  
Wang Lu ◽  
◽  
Qiao Xinhua ◽  
Gao Lei ◽  
Chen Chang ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Bacterial Adhesion ◽  
Quantitative Method

scholarly journals Antimicrobial Resistance and Biofilm Formation of Pseudomonas aeruginosa

10.3823/846 ◽  
2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Abdelraouf A Elmanama ◽  
Suhaila Al-Sheboul ◽  
Renad I Abu-Dan
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibiotic Resistance ◽  
Antimicrobial Resistance ◽  
Quorum Sensing ◽  
Bacterial Adhesion ◽  
Biofilm Formation ◽  
Bacterial Infections ◽  
Developmental Stages ◽  
Infection Site ◽  
Major Virulence Factor

Abstract Pseudomonas aeruginosa threatens patient’s care. It is considered as the most complicated health care associated pathogen to be eliminated from infection site. The biofilm forming ability of P. aeruginosa, being a major virulence factor for most pathogenic microorganism, protects it from host immunity and contribute to antibiotic resistance of this organism. It is estimated that about 80% of infectious diseases are due to biofilm mode of growth. Biofilm forming ability of bacteria imparts antimicrobial resistance that leads to many persistent and chronic bacterial infections. The world is becoming increasingly under the threat of entering the “post-antibiotic era”, an era in which the rate of death from bacterial infections is higher than from cancer. This review focus on P. aeruginosa biofilm forming ability; definition, developmental stages, and significance. In addition, the quorum sensing and the antibiotic resistance of this pathogen is discussed. Keywords: Biofilm; bacterial adhesion; Pseudomonas aeruginosa; antimicrobial resistance; quorum sensing.

scholarly journals Antibacterial coating on biocomposites for cranio-facial reconstruction

2016 ◽  
Vol 89 (3) ◽  
pp. 430-434 ◽  
Author(s):  
Madalina Anca Lazar ◽  
Dan Vodnar ◽  
Doina Prodan ◽  
Horatiu Rotaru ◽  
Calin Rares Roman ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacterial Adhesion ◽  
Inhibition Zone ◽  
Fiber Reinforced ◽  
Bacterial Strains ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Craniofacial Implants ◽  
Systemic Antibiotics

Background and aims. Despite the fact that implants are sterilized, antiseptic techniques are applied and systemic antibiotics are routinely administered prior to and after craniofacial surgery, infection rates between 3% and 40% are still reported for alloplastic implants, urging for implant removal. The present study focuses on the development of a fiber-reinforced composite (FRC) implant for craniofacial reconstruction with antimicrobial properties.Methods. A new fiber-reinforced composite coated with gentamicin was developed and tested for bacterial adherence and antibacterial efficiency, using two of the most involved bacterial strains in the postoperative infections: Staphylococcus aureus and Pseudomonas aeruginosa.Results. Bacteria were efficiently inactivated in direct contact with gentamicin coatings (p<0.05). The inhibition zone for Staphylococcus aureus ranged from 17.21 mm to 20.13 mm and for Pseudomonas aeruginosa ranged from 12.93 mm to 15.33 mm. Although no significant statistical results were found for bacterial adhesion and gentamicin concentration, (Staphylococcus aureus: β= -0.974; p=0.144>0.05 and Pseudomonas aeruginosa: β = -0.921; p=0.255>0.05), a negative relation was observed, indicating the reversed relation between the antibiotic dosage and the bacterial adherence.Conclusion. The results of the two applied microbiological protocols used in the study suggested that gentamicin eluting coating inhibited not only the bacterial growth, but also led to a lower initial bacterial adhesion to the surface of the implant. Thus, antibiotic coating of craniofacial implants may reduce the infection rate related to reconstructive surgery.

Effects of selected carbohydrates and the contribution of the prophenoloxidase cascade system to the adhesion of strains of Pseudomonas aeruginosa and Proteus mirabilis to hemocytes of nonimmune larval Galleria mellonella

1989 ◽  
Vol 35 (4) ◽  
pp. 524-527 ◽  
Author(s):  
Gary B. Dunphy ◽  
June S. Chadwick
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Proteus Mirabilis ◽  
Bacterial Adhesion ◽  
Galleria Mellonella ◽  
Granular Cells ◽  
Cascade System ◽  
Phenoloxidase Activity

The adhesion of strains of Pseudomonas aeruginosa and Proteus mirabilis to the plasmatocytes and granular cells of non-immune larval Galleria mellonella was influenced by and varied with the type of carbohydrate. Laminarin enhanced prophenoloxidase activation and bacterial adhesion to the hemocytes whereas sucrose suppressed both activities. For all other sugars there was no correlation between bacterial adhesion to the hemocytes and phenoloxidase activity. It is proposed that bacterial adhesion to the hemocytes may be mediated by both lectinlike binding and components of the prophenoloxidase activating system acting like opsonins.Key words: Pseudomonas, Proteus, hemocytes, prophenoloxidase, lectins.

scholarly journals The Swarming Motility of Pseudomonas aeruginosa Is Blocked by Cranberry Proanthocyanidins and Other Tannin-Containing Materials

2011 ◽  
Vol 77 (9) ◽  
pp. 3061-3067 ◽  
Author(s):  
Che O'May ◽  
Nathalie Tufenkji
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Bacterial Adhesion ◽  
Type Iv Pili ◽  
Hydrolyzable Tannin ◽  
Swarming Motility ◽  
Subsequent Formation ◽  
Content Type ◽  
Type Iv ◽  
Derivatives Of ◽  
Growth Experiments

ABSTRACTBacterial motility plays a key role in the colonization of surfaces by bacteria and the subsequent formation of resistant communities of bacteria called biofilms. Derivatives of cranberry fruit, predominantly condensed tannins called proanthocyanidins (PACs) have been reported to interfere with bacterial adhesion, but the effects of PACs and other tannins on bacterial motilities remain largely unknown. In this study, we investigated whether cranberry PAC (CPAC) and the hydrolyzable tannin in pomegranate (PG; punicalagin) affected the levels of motilities exhibited by the bacteriumPseudomonas aeruginosa. This bacterium utilizes flagellum-mediated swimming motility to approach a surface, attaches, and then further spreads via the surface-associated motilities designated swarming and twitching, mediated by multiple flagella and type IV pili, respectively. Under the conditions tested, both CPAC and PG completely blocked swarming motility but did not block swimming or twitching motilities. Other cranberry-containing materials and extracts of green tea (also rich in tannins) were also able to block or impair swarming motility. Moreover, swarming bacteria were repelled by filter paper discs impregnated with many tannin-containing materials. Growth experiments demonstrated that the majority of these compounds did not impair bacterial growth. When CPAC- or PG-containing medium was supplemented with surfactant (rhamnolipid), swarming motility was partially restored, suggesting that the effective tannins are in part acting by a rhamnolipid-related mechanism. Further support for this theory was provided by demonstrating that the agar surrounding tannin-induced nonswarming bacteria was considerably less hydrophilic than the agar area surrounding swarming bacteria. This is the first study to show that natural compounds containing tannins are able to blockP. aeruginosaswarming motility and that swarming bacteria are repelled by such compounds.

Inhibition of bacterial adhesion and biofilm formation of sulfonated chitosan against Pseudomonas aeruginosa

2019 ◽  
Vol 206 ◽  
pp. 412-419 ◽  
Author(s):  
Yuhong Liu ◽  
Yu Jiang ◽  
Junli Zhu ◽  
Jianying Huang ◽  
Haijiang Zhang
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Bacterial Adhesion ◽  
Biofilm Formation

scholarly journals Bacterial adhesion to Conventional and Silicone hydrogel contact lenses

2021 ◽  
Vol 23 (1) ◽  
pp. 25-35
Author(s):  
Eghosasere Iyamu ◽  
Frederick Osaro Ekhaise
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Contact Lens ◽  
Bacterial Adhesion ◽  
Contact Lenses ◽  
Bacterial Species ◽  
Soft Contact ◽  
Silicone Hydrogel ◽  
Soft Contact Lenses ◽  
Lens Wear

Purpose: The aim of this study was to investigate the adhesion of bacteria to worn silicone hydrogel and conventional soft contact lenses.Methods: Bacterial adhesion experiments / assays were performed on 24 worn and 6 unworn soft contact lenses each of different materials (high- and low- gas permeable lenses) using the strains such as Pseudomonas aeruginosa ATCC 27853 and Staphylococcus aureus ATCC 25923.Results: P. aeruginosa adhered in increased number to worn than unworn Lotrafilcon A and conventional lenses. However, a higher number of P. aeruginosa adhered to unworn than worn Lotrafilcon B, the difference in the mean adhesion was not significant (p = 0.66). S. aureus adhered in significantly decreased number to worn Lotrafilcon A, nelfilcon A, nesofilcon A, etafilcon A and omafilcon A (p<0.05); butsignificantly higher number adhered to worn than unworn polymacon (p<0.05). Lens wear had no effect on the adhesion of S. aureus to Lotrafilcon B (p>0.05). The least adhesion of P. aeruginosa to worn contact lenses was seen with polymacon, while S. aureus adhered in least number to worn Lotrafilcon A compared to the other contact lens materials that demonstrated the same trend in adhesion.Conclusion: The higher adhesion of P. aeruginosa to worn lenses is consistent with the claim that it is the most implicated in all culture-positive contact lens related bacterial keratitis. Lens wear has different effects on bacterial adhesion, which may be due to type of lens materials and bacterial species/genera studied. Keywords: Silicone hydrogel lenses, conventional lenses, Pseudomonas aeruginosa, Staphylococcus aureus, bacterial adhesion.

scholarly journals A influência do quórum sensing na formação do biofilme por Pseudomonas aeruginosa

2021 ◽  
Vol 10 (2) ◽  
pp. e33910212659
Author(s):  
Marina Luizy da Rocha Neves ◽  
Luanne Eugênia Nunes ◽  
Wilma Raianny Vieira da Rocha ◽  
Eulália Camelo Pessoa de Azevedo Ximenes ◽  
Mônica Camelo Pessoa de Azevedo Albuquerque
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Virulence Factors ◽  
Bacterial Adhesion ◽  
Biofilm Matrix

As bactérias se organizam de forma agregada numa matriz extracelular, chamada biofilme, estrutura que confere proteção a bactéria a ação dos antimicrobianos e a resposta imune do hospedeiro. Assim, Pseudomonas aeruginosa, é classificado como um micro-organismo oportunista, responsável por causar altos números de infecções hospitalares devido a resistência bacteriana desenvolvida por fatores de virulência como o biofilme, controlados por o sistema quorum sensing. Desse modo, o objetivo desse trabalho foi descrever a comunicação das células bacteriana para formação do biofilme por P. aeruginosa, durante o processo de colonização e infecção no hospedeiro. Seguiu-se a metodologia de uma revisão narrativa, com base nos artigos publicados entre os anos de 2000 e 2020, indexados na Biblioteca Virtual em Saúde (BVS), utilizando para busca os descritores: “quorum sensing”, "Pseudomonas aeruginosa", "biofilm", "virulence factors", "Flagella", "pili", "bacterial adhesion" "polysaccharide" "adhesins" e "biofilm matrix”. Foram selecionados artigos publicados na íntegra, em inglês, entre os anos de 1990 e 2020. Foram excluídos artigos incompletos, duplicados e trabalhos acadêmicos como teses e dissertações. Evidenciou-se que a resistência bacteriana de P. aeruginosa aos antibióticos está relacionada a sua alta capacidade de adaptação a ambientes hostis e aos mecanismos de resistência desenvolvidos pela espécie, especialmente a formação do biofilme bacteriano pelo sistema quorum sensing a partir da biossíntese de moléculas autoindutoras como: N-3-oxo-dodecanoil homoserina lactona, N-butanoil-homoserina lactona e 2-heptil-3-hidroxi-4-quinolona, responsáveis por mediar a produção dos fatores de virulência. Esta revisão abordou os aspectos gerais que envolve a patogenicidade oriunda da comunicação bacteriana durante o seu processo de colonização.

Staphylococcus Epidermidis and Pseudomonas Aeruginosa Adhesion Intensity on a TiO2 Ceramic in an in Vitro Study

2011 ◽  
Vol 222 ◽  
pp. 301-304 ◽  
Author(s):  
Agnese Pavlova ◽  
Aigars Reinis ◽  
Liga Berzina-Cimdina ◽  
Juta Kroica ◽  
Aleksandra Burlakova ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Surface Charge ◽  
Staphylococcus Epidermidis ◽  
Bacterial Adhesion ◽  
Tio2 Ceramic ◽  
Forming Technology ◽  
Thermally Treated

Extrusion is a perspective forming technology for obtaining objects with certain profile, important for the TiO2 application as biomaterial. Extruded samples were calcinated at 1100 °C, thermally treated in different atmospheres: at 1450 °C in air and at 1300 °C in vacuum. An approach was made to examine the adhesion and colonization intensity of Staphylococcus epidermidis and Pseudomonas aeruginosa on TiO2 ceramic in vitro. It was found that Ps.aeruginosa demonstrated higher adhesion and colonization intensity as S.epidermidis and TiO2 samples treated in vacuum demonstrated higher attachment of microorganisms as TiO2 samples treated in air. It was supposed that surface charge promoted the bacterial adhesion on the vacuum treated samples.

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