Sodium houttuyfonate inhibits biofilm formation and alginate biosynthesis-associated gene expression in a clinical strain of Pseudomonas aeruginosa in vitro

Wu, Donghui; Cheng, Hongwei; Duan, Qiangjun; Huang, Weifeng

doi:10.3892/etm.2015.2562

Cited by 23 publications

(18 citation statements)

References 33 publications

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“…Drug treatment was conducted as described above. Total RNA was isolated as previously described with some modifications [18,19]. Biofilms were dislodged by 1 mL TRIzon reagent of Ultrapure RNA Kit (CWBio, Beijing, China) and the suspension was collected.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Evaluation of a Chitosan Oligosaccharide-Streptomycin Conjugate against Pseudomonas aeruginosa Biofilms

Yuan

Wei

et al. 2019

Marine Drugs

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Microbial biofilms are considerably more resistant to antibiotics than planktonic cells. It has been reported that chitosan coupling with the aminoglycoside antibiotic streptomycin dramatically disrupted biofilms of several Gram-positive bacteria. This finding suggested the application of the covalent conjugate of antimicrobial natural polysaccharides and antibiotics on anti-infection therapy. However, the underlying molecular mechanism of the chitosan-streptomycin conjugate (CS-Strep) remains unclear and the poor water-solubility of the conjugate might restrict its applications for anti-infection therapy. In this study, we conjugated streptomycin with water-soluble chitosan oligosaccharides (COS). Unlike CS-Strep, the COS-streptomycin conjugate (COS-Strep) barely affected biofilms of tested Gram-positive bacteria. However, COS-Strep efficiently eradicated established biofilms of the Gram-negative pathogen Pseudomonas aeruginosa. This activity of COS-Strep was influenced by the degree of polymerization of chitosan oligosaccharide. The increased susceptibility of P. aeruginosa biofilms to antibiotics after conjugating might be related to the following: Suppression of the activation of MexX-MexY drug efflux pump system induced by streptomycin treatment; and down-regulation of the biosynthesis of biofilm exopolysaccharides. Thus, this work indicated that covalently linking antibiotics to chitosan oligosaccharides was a possible approach for the development of antimicrobial drugs against biofilm-related infections.

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Section: Methodsmentioning

confidence: 99%

Synthesis and Evaluation of a Chitosan Oligosaccharide-Streptomycin Conjugate against Pseudomonas aeruginosa Biofilms

Yuan

Wei

et al. 2019

Marine Drugs

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“…SNH has spectrum wide antibacterial activity, few adverse reactions, and improves immunity ( Juanjuan, 2009 ; Yumei et al, 2012 ; Yang et al, 2016 ). Previously, we confirmed that sodium houttuyfonate (SH) has a certain inhibitory effect on P. aeruginosa ( Shao et al, 2013 ; Wu et al, 2014 ; Wu et al, 2015 ). SNH and SH structures are highly similar, but SNH is more chemically stable than does SH ( Yumei et al, 2012 ).…”

Section: Introductionmentioning

confidence: 63%

Sodium New Houttuyfonate Affects Transcriptome and Virulence Factors of Pseudomonas aeruginosa Controlled by Quorum Sensing

Zhao

Mei

et al. 2020

Front. Pharmacol.

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As a major opportunistic pathogen, Pseudomonas aeruginosa can produce various virulence factors and form biofilms. These processes are controlled by the quorum sensing (QS) system. Sodium new houttuyfonate (SNH) is an adduct of houttuyfonate, the main component of the common Chinese medicine plant Houttuynia cordata, which has antibacterial and anti-inflammatory effects. We evaluated the effect of SNH on P. aeruginosa biofilms, virulence factors, and transcription. Transcriptome analysis showed that the key rhlI and pqsA genes of the P. aeruginosa QS system were down-regulated after SNH treatment. SNH reduces proteases and pyocyanin production and inhibits biofilm formation by regulating the P. aeruginosa QS system. SNH also changes the expression of genes related to virulence factors and biofilms ( lasA, lasB, lecA, phzM, pqsA , and pilG ). These results suggested that the mechanism of SNH against P. aeruginosa by affecting the expression of biofilm and virulence factors controlled by quorum sensing.

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“…Recently, SH was found to inhibit the biofilm formation of P. aeruginosa, S. aureus, and C. albicans in vitro (20)(21)(22)(23)(24)(25), but the detail of mechanisms remains unclear. Previously, we found that SH in combination with erythromycin groups at sub-inhibitory concentrations could effectively inhibit the biofilm formation of S. epidermidis at adhesion and maturation stages (26,27).…”

Section: Discussionmentioning

confidence: 99%

“…Previously, our group found that SH is promising and effective at repressing pathogenic related biofilm formation and motility of Pseudomonas aeruginosa (20)(21)(22), and can inhibit S. epidermidis and Candida albicans (20,23), and act synergistically with Na 2 -EDTA and levofloxacin against biofilm formation of P. aeruginosa, S. aureus and C. albicans (23,24). In addition, we found that SH is a possible natural analog of N-acyl-homoserine lactone, and can effectively inhibit the Las quorum sensing (QS) system and regulated virulence factors of P. aeruginosa (25).…”

Section: Introductionmentioning

confidence: 99%

Sub-Inhibitory Concentrations of Sodium Houttuyfonate in Combination with Erythromycin Inhibit Biofilm Formation and Expression of IcaA in Staphylococcus epidermidis

Duan

et al. 2019

Jundishapur J Microbiol

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Background: Staphylococcus epidermidis is an important opportunistic pathogenic bacterium causing infections on implanted medical devices by biofilm formation. Sodium houttuyfonate (SH), which is the active modified compound of Houttuynia cordata is commonly applied for treating chronic bronchitis, purulent skin infections, and respiratory tract infections in China. Objectives: We aimed to investigate the in vitro effects of SH in combination with erythromycin on the production of IcaA and expression of icaA to shed the light on the mechanism of SH and erythromycin in inhibiting biofilm formation of S. epidermidis. Methods: The morphology of the biofilm of S. epidermidis was examined under a scanning electron microscope. Furthermore, inhibitory effects of SH and erythromycin on the production of IcaA and the expression of icaA were detected by Western blotting and quantitative reverse transcription PCR, respectively. Results: First, the morphological results indicated that combing SH and erythromycin at sub-MIC concentrations can effectively inhibit biofilm formation of S. epidermidis. Furthermore, our presented results showed that combing SH and erythromycin at sub-MIC concentration can significantly downregulate the expression of icaA and repress the protein production of IcaA at irreversible attachment and maturation stages of biofilm formation of S. epidermidis. Conclusions: Therefore, our findings suggest that the potent antibiofilm activity of SH in combination with erythromycin against S. epidermidis may be partially due to inactivation of icaA.

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Sodium houttuyfonate inhibits biofilm formation and alginate biosynthesis-associated gene expression in a clinical strain of Pseudomonas aeruginosa in vitro

Cited by 23 publications

References 33 publications

Synthesis and Evaluation of a Chitosan Oligosaccharide-Streptomycin Conjugate against Pseudomonas aeruginosa Biofilms

Synthesis and Evaluation of a Chitosan Oligosaccharide-Streptomycin Conjugate against Pseudomonas aeruginosa Biofilms

Sodium New Houttuyfonate Affects Transcriptome and Virulence Factors of Pseudomonas aeruginosa Controlled by Quorum Sensing

Sub-Inhibitory Concentrations of Sodium Houttuyfonate in Combination with Erythromycin Inhibit Biofilm Formation and Expression of IcaA in Staphylococcus epidermidis

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