Journal of Microbiology

Volume 59(12); December 2021

Journal Articles

Transposon insertion site sequencing (TIS) of Pseudomonas aeruginosa: Hongbaek Cho; J. Microbiol. 2021;59(12):1067-1074. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1565-y

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Transposon insertion site sequencing (TIS) is a technique that determines the insertion profile of a transposon mutant library by massive parallel sequencing of transposon-genomic DNA junctions. Because the transposon insertion profile reflects the abundance of each mutant in the library, it provides information to assess the fitness contribution of each genetic locus of a bacterial genome in a specific growth condition or strain background. Although introduced only about a dozen years ago, TIS has become an important tool in bacterial genetics that provides clues to study biological functions and regulatory mechanisms. Here, I describe a protocol for generating high density transposon insertion mutant libraries and preparing Illumina sequencing samples for mapping the transposon junctions of the transposon mutant libraries using Pseudomonas aeruginosa as an example.

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Optimizing phage-based mutant recovery and minimizing heat effect in the construction of transposon libraries in Staphylococcus aureus
Sally W. Yousief, Nader Abdelmalek, Bianca Paglietti
Scientific Reports.2024;[Epub] CrossRef
The biological essence of synthetic lethality: Bringing new opportunities for cancer therapy
Meiyi Ge, Jian Luo, Yi Wu, Guobo Shen, Xi Kuang
MedComm – Oncology.2024;[Epub] CrossRef
Optimization of Transposon Mutagenesis Methods in Pseudomonas antarctica
Sangha Kim, Changhan Lee
Microorganisms.2023; 11(1): 118. CrossRef
Construction of high-density transposon mutant library of Staphylococcus aureus using bacteriophage ϕ11
Wonsik Lee
Journal of Microbiology.2022; 60(12): 1123. CrossRef

Non-mitochondrial aconitase regulates the expression of iron-uptake genes by controlling the RNA turnover process in fission yeast: Soo-Yeon Cho , Soo-Jin Jung , Kyoung-Dong Kim , Jung-Hye Roe; J. Microbiol. 2021;59(12):1075-1082. Published online October 26, 2021; DOI: https://doi.org/10.1007/s12275-021-1438-4

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Abstract

Aconitase, a highly conserved protein across all domains of life, functions in converting citrate to isocitrate in the tricarboxylic acid cycle. Cytosolic aconitase is also known to act as an iron regulatory protein in mammals, binding to the RNA hairpin structures known as iron-responsive elements within the untranslated regions of specific RNAs. Aconitase-2 (Aco2) in fission yeast is a fusion protein consisting of an aconitase and a mitochondrial ribosomal protein, bL21, residing not only in mitochondria but also in cytosol and the nucleus. To investigate the role of Aco2 in the nucleus and cytoplasm of fission yeast, we analyzed the transcriptome of aco2ΔN mutant that is deleted of nuclear localization signal (NLS). RNA sequencing revealed that the aco2ΔN mutation caused increase in mRNAs encoding iron uptake transporters, such as Str1, Str3, and Shu1. The half-lives of mRNAs for these genes were found to be significantly longer in the aco2ΔN mutant than the wild-type strain, suggesting the role of Aco2 in mRNA turnover. The three conserved cysteines required for the catalytic activity of aconitase were not necessary for this role. The UV cross-linking RNA immunoprecipitation analysis revealed that Aco2 directly bound to the mRNAs of iron uptake transporters. Aco2-mediated degradation of iron-uptake mRNAs appears to utilize exoribonuclease pathway that involves Rrp6 as evidenced by genetic interactions. These results reveal a novel role of non-mitochondrial aconitase protein in the mRNA turnover in fission yeast to fine-tune iron homeostasis, independent of regulation by transcriptional repressor Fep1.

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Iron-mediated post-transcriptional regulation in Toxoplasma gondii
Megan A. Sloan, Adam Scott, Dana Aghabi, Lucia Mrvova, Clare R. Harding, Dominique Soldati-Favre
PLOS Pathogens.2025; 21(2): e1012857. CrossRef
The Key Enzymes of Carbon Metabolism and the Glutathione Antioxidant System Protect Yarrowia lipolytica Yeast Against pH-Induced Stress
Tatyana I. Rakhmanova, Natalia N. Gessler, Elena P. Isakova, Olga I. Klein, Yulia I. Deryabina, Tatyana N. Popova
Journal of Fungi.2024; 10(11): 747. CrossRef
The intricate link between iron, mitochondria and azoles in Candida species
Wouter Van Genechten, Rudy Vergauwen, Patrick Van Dijck
The FEBS Journal.2024; 291(16): 3568. CrossRef
Non-Mitochondrial Aconitase-2 Mediates the Transcription of Nuclear-Encoded Electron Transport Chain Genes in Fission Yeast
Ho-Jung Kim, Soo-Yeon Cho, Soo-Jin Jung, Yong-Jun Cho, Jung-Hye Roe, Kyoung-Dong Kim
Journal of Microbiology.2024; 62(8): 639. CrossRef
Kinetic and Regulatory Properties of Yarrowia lipolytica Aconitate Hydratase as a Model-Indicator of Cell Redox State under pH Stress
Tatyana I. Rakhmanova, Varvara Yu. Sekova, Natalya N. Gessler, Elena P. Isakova, Yulia I. Deryabina, Tatyana N. Popova, Yevgeniya I. Shurubor, Boris F. Krasnikov
International Journal of Molecular Sciences.2023; 24(8): 7670. CrossRef

Regulation of iron homeostasis by peroxide-sensitive CatR, a Fur-family regulator in Streptomyces coelicolor: Yeonbum Kim , Jung-Hye Roe , Joo-Hong Park , Yong-Joon Cho , Kang-Lok Lee; J. Microbiol. 2021;59(12):1083-1091. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1457-1

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Abstract

CatR, a peroxide-sensing transcriptional repressor of Fur family, can de-repress the transcription of the catA gene encoding catalase upon peroxide stress in Streptomyces coelicolor. Since CatR-regulated genes other than catA and its own gene catR have not been identified in detail, the understanding of the role of CatR regulon is very limited. In this study, we performed transcriptomic analysis to identify genes influenced by both 􀈟􀂊atR mutation and hydrogen peroxide treatment. Through ChIP-qPCR and other analyses, a new consensus sequence was found in CatR-responsive promoter region of catR gene and catA operon for direct regulation. In addition, vtlA (SCO2027) and SCO4983 were identified as new members of the CatR regulon. Expression levels of iron uptake genes were reduced by hydrogen peroxide and a DmdR1 binding sequence was identified in promoters of these genes. The increase in free iron by hydrogen peroxide was thought to suppress the iron import system by DmdR1. A putative exporter protein VtlA regulated by CatR appeared to reduce intracellular iron to prevent oxidative stress. The name vtlA (VIT1-like transporter) was proposed for iron homeostasis related gene SCO2027.

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Structure, Function, and Biosynthesis of Siderophores Produced by Streptomyces Species
Mingxuan Wang, Honglin Li
Journal of Agricultural and Food Chemistry.2025; 73(8): 4425. CrossRef
Autonomous Defense Based on Biogenic Nanoparticle Formation in Daunomycin-Producing Streptomyces
Karel Beneš, Vladislav Čurn, Baveesh Pudhuvai, Jaroslav Motis, Zuzana Michalcová, Andrea Bohatá, Jana Lencová, Jan Bárta, Michael Rost, Andreas Vilcinskas, Vladimír Maťha
Microorganisms.2025; 13(1): 107. CrossRef
Functional versatility of Zur in metal homeostasis, motility, biofilm formation, and stress resistance in Yersinia pseudotuberculosis
Yanchao Gu, Yongde Liu, Wei Mao, Ying Peng, Xiaoru Han, Han Jin, Jingling Xu, Liyang Chang, Yixin Hou, Xihui Shen, Xingyu Liu, Yantao Yang, G. Marcela Rodriguez
Microbiology Spectrum.2024;[Epub] CrossRef
Multi-integrated approach for unraveling small open reading frames potentially associated with secondary metabolism in Streptomyces
Si-Min Fan, Ze-Qi Li, Shi-Zhe Zhang, Liang-Yu Chen, Xi-Ying Wei, Jian Liang, Xin-Qing Zhao, Chun Su, Xiao-Hua Zhang
mSystems.2023;[Epub] CrossRef
The regulatory role of Fur-encoding SCLAV_3199 in iron homeostasis in Streptomyces clavuligerus
Büşra Abanoz-Seçgin, Çiğdem Otur, Sezer Okay, Aslıhan Kurt-Kızıldoğan
Gene.2023; 878: 147594. CrossRef

Lactiplantibacillus plantarum LRCC5314 includes a gene for serotonin biosynthesis via the tryptophan metabolic pathway: Jiseon Jeong , Yunjeong Lee , Seokmin Yoon , Jong-Hwa Kim , Wonyong Kim; J. Microbiol. 2021;59(12):1092-1103. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1472-2

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Abstract

As the functions of probiotics within the same species may not be shared, it is important to analyze the genetic characteristics of strains to determine their safety and usefulness before industrial applications. Hence the present study was undertaken to determine functional genes, and beneficial activities of strain LRCC5314, a bacterial strain isolated from kimchi through comparative genomic analysis. Phylogenetic analysis based on the 16S rRNA gene sequence showed that strain LRCC5314 was a member of the species L. plantarum. Whole genome size of strain LRCC5314 was sequence was 3.25 Mb long, with a G + C content of 44.5 mol% and 3,031 predicted genes. Strain LRCC5314 could metabolize hexoses through homofermentation, which produces only lactic acid from hexoses. According to gene annotation, strain LRCC- 5314 contained genes of EPS production and CRISPR. Moreover, the strain contained genes that could encode a complete biosynthetic pathway for the production of tryptophan, which can be used as a precursor of serotonin. Notably, the tryptophan and serotonin activities strain LRCC5314 were higher than those of reference strains, L. plantarum ATCC 14917T, DSM 20246, DSM 2601, and ATCC 8014, which reach tryptophan amount of 0.784 ± 0.045 μM/ml in MRS broth and serotonin concentration of 19.075 ± 0.295 ng/ml in HT-22 cells. These findings indicated that L. plantarum LRCC5314 could provide a source for serotonin production and could be used as a functional probiotic for stress regulation.

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Fermented foods: Harnessing their potential to modulate the microbiota-gut-brain axis for mental health
Ramya Balasubramanian, Elizabeth Schneider, Eoin Gunnigle, Paul D. Cotter, John F. Cryan
Neuroscience & Biobehavioral Reviews.2024; 158: 105562. CrossRef
Effect of postbiotic Lactiplantibacillus plantarum LRCC5314 supplemented in powdered milk on type 2 diabetes in mice
J.-H. Kim, W. Kwak, Y. Nam, J. Baek, Y. Lee, S. Yoon, W. Kim
Journal of Dairy Science.2024; 107(8): 5301. CrossRef
The role of pharmacomicrobiomics in HIV prevention, treatment, and women’s health
Erik C. Swanson, Christopher M. Basting, Nichole R. Klatt
Microbiome.2024;[Epub] CrossRef
Whole-Genome Sequence of Lactococcus lactis Subsp. lactis LL16 Confirms Safety, Probiotic Potential, and Reveals Functional Traits
Justina Mileriene, Jurgita Aksomaitiene, Kristina Kondrotiene, Tora Asledottir, Gerd Elisabeth Vegarud, Loreta Serniene, Mindaugas Malakauskas
Microorganisms.2023; 11(4): 1034. CrossRef
Probiotic Incorporation into Yogurt and Various Novel Yogurt-Based Products
Douglas W. Olson, Kayanush J. Aryana
Applied Sciences.2022; 12(24): 12607. CrossRef

Adaptation of Pseudomonas helmanticensis to fat hydrolysates and SDS: fatty acid response and aggregate formation: Ilya N. Zubkov , Anatoly P. Nepomnyshchiy , Vadim D. Kondratyev , Pavel N. Sorokoumov , Konstantin V. Sivak , Edward S. Ramsay , Sergey M. Shishlyannikov; J. Microbiol. 2021;59(12):1104-1111. Published online October 26, 2021; DOI: https://doi.org/10.1007/s12275-021-1214-5

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Abstract

An essential part of designing any biotechnological process is examination of the physiological state of producer cells in different phases of cultivation. The main marker of a bacterial cell’s state is its fatty acid (FA) profile, reflecting membrane lipid composition. Consideration of FA composition enables assessment of bacterial responses to cultivation conditions and helps biotechnologists understand the most significant factors impacting cellular metabolism. In this work, soil SDS-degrading Pseudomonas helmanticensis was studied at the fatty acid profile level, including analysis of rearrangement between planktonic and aggregated forms. The set of substrates included fat hydrolysates, SDS, and their mixtures with glucose. Such media are useful in bioplastic production since they can help incrementally lower overall costs. Conventional gas chromatography-mass spectrometry was used for FA analysis. Acridine orange-stained aggregates were observed by epifluorescence microscopy. The bacterium was shown to change fatty acid composition in the presence of hydrolyzed fats or SDS. These changes seem to be driven by the depletion of metabolizable substrates in the culture medium. Cell aggregation has also been found to be a defense strategy, particularly with anionic surfactant (SDS) exposure. It was shown that simple fluidity indices (such as saturated/ unsaturated FA ratios) do not always sufficiently characterize a cell's physiological state, and morphological examination is essential in cases where complex carbon sources are used.

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Effect of different diet composition on the fat profile of two different black soldier fly larvae populations
M. Tognocchi, L. Abenaim, C. Adamaki-Sotiraki, G.C. Athanassiou, I.C. Rumbos, M. Mele, B. Conti, G. Conte
animal.2024; 18(7): 101205. CrossRef
Earth to Mars: A Protocol for Characterizing Permafrost in the Context of Climate Change as an Analog for Extraplanetary Exploration
Kimberley R. Miner, Joseph Razzell Hollis, Charles E. Miller, Kyle Uckert, Thomas A. Douglas, Emily Cardarelli, Rachel Mackelprang
Astrobiology.2023; 23(9): 1006. CrossRef
Preparation of polyhydroxyalkanoates using Pseudomonas helmanticensis in non-sterile media containing glycerol and sodium dodecyl sulfate
I. N. Zubkov, Yu. S. Bukin, P. N. Sorokoumov, S. M. Shishlyannikov
Proceedings of Universities. Applied Chemistry and Biotechnology.2022; 12(3): 479. CrossRef

Antibacterial pathway of cefquinome against Staphylococcus aureus based on label-free quantitative proteomics analysis: Linglin Gao , Hao Zhu , Yun Chen , Yuhui Yang; J. Microbiol. 2021;59(12):1112-1124. Published online November 9, 2021; DOI: https://doi.org/10.1007/s12275-021-1201-x

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Abstract

Cefquinome (CEQ) is a novel β-lactam antibiotic that exhibits excellent antibacterial activity against Staphylococcus aureus. However, the bacterial protein targets of CEQ are unclear. To evaluate the relationship between the pharmacokinetic/ pharmacodynamic (PK/PD) parameters of CEQ and strains with varying degrees of resistance and to elucidate bacterial protein responses to CEQ treatment, label-free quantitative proteomics analysis was conducted. The sensitive S. aureus ATCC6538 and the resistant 2MIC and 8MIC were tested for differentially expressed proteins. An in vitro model was treated with different concentrations of CEQ (3, 5, or 10 μg/ml) with different terminal half-lives (2.5 or 5 h) at different intervals (12 or 24 h). Differentially expressed proteins were evaluated using Gene Ontology analysis followed by KEGG pathway enrichment analysis and STRING network analysis. RT-qPCR was performed to validate the differentially expressed proteins at the molecular level. The results showed that the degree of resistance increased in a cumulative manner and increased gradually with the extension of administration time. The resistant strain would not have appeared in the model only if %T > mutant prevention concentration ≥ 50%. The expression of 45 proteins significantly changed following CEQ treatment, among which 42 proteins were obviously upregulated and 3 were downregulated. GO analysis revealed that the differentially expressed proteins were mainly present on cells and the cell membrane, participated in metabolic and intracellular processes, and had catalytic and binding activities. The RPSO, SDHB, CITZ, ADK, and SAOUHSC 00113 genes in S. aureus may play important roles in the development of resistance to CEQ. These results provided important reference candidate proteins as targets for overcoming S. aureus resistance to CEQ.

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Detection of Antibiotic Resistance in Feline-Origin ESBL Escherichia coli from Different Areas of China and the Resistance Elimination of Garlic Oil to Cefquinome on ESBL E. coli
Yin-Chao Tong, Peng-Cheng Li, Yang Yang, Qing-Yi Lin, Jin-Tong Liu, Yi-Nuo Gao, Yi-Ning Zhang, Shuo Jin, Su-Zhu Qing, Fu-Shan Xing, Yun-Peng Fan, Ying-Qiu Liu, Wei-Ling Wang, Wei-Min Zhang, Wu-Ren Ma
International Journal of Molecular Sciences.2023; 24(11): 9627. CrossRef

Geographic diversity in Helicobacter pylori oipA genotype between Korean and United States isolates: Aeryun Kim , Jing Lai , D. Scott Merrell , Ji-Hye Kim , Hanfu Su , Jeong-Heon Cha; J. Microbiol. 2021;59(12):1125-1132. Published online October 31, 2021; DOI: https://doi.org/10.1007/s12275-021-1450-8

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Abstract

Helicobacter pylori outer membrane inflammatory protein A (OipA) was originally named for its role in inducing inflammation in the host, as evidenced by high mucosal IL-8 levels. Expression of OipA is regulated by phase variation of a CT dinucleotide-repeat located in the 5􍿁􀁇region of the gene. However, little is known about OipA geographic diversity across isolates. To address this gap, we conducted a large-scale molecular epidemiologic analysis using H. pylori clinical isolates obtained from two geographically distinct populations: Korea and the United States (US). Most Korean isolates (98.7%) possessed two copies of oipA located at two specific loci (A and B) while all US isolates contained only one copy of oipA at locus A. Furthermore, most Korean oipA (94.8%) possessed three or less CT repeats while most US oipA (96.6%) contained five or more CT repeats. Among the two copies, all Korean H. pylori possessed at least one oipA ‘on’ phase variant while the single copy of oipA in US isolates showed 56.2% ‘on’ and 43.8% ‘off.’ Thus, host differences seem to have driven geographic diversification of H. pylori across these populations such that OipA expression in US isolates is still regulated by phase variation with 5 or more CT repeats, while Korean isolates always express OipA; duplication of the oipA combined with a reduction of CT repeats to three or less ensures continued expression. En masse, these findings suggest that diversity in the oipA gene copy number, CT repeats, and phase variation among H. pylori from different populations may confer a benefit in adaptation to particular host populations.

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Genetic diversity of the oipA gene among Helicobacter pylori isolates and clinical outcome in Vietnam
Thi Hong Nhung Thai, Hong Phong Nguyen, Thi Hai Yen Nguyen, Thi Be Hai Nguyen, Thai Hoa Nguyen, Thi Mai Ngan Nguyen, Thi Minh Thi Ha
Infection, Genetics and Evolution.2023; 112: 105438. CrossRef
Characterization of East-Asian Helicobacter pylori encoding Western EPIYA-ABC CagA
Kavinda Tissera, Myeong-A Kim, Jing Lai, Sacheera Angulmaduwa, Aeryun Kim, D. Scott Merrell, Ji-Hye Kim, Hanfu Su, Jeong-Heon Cha
Journal of Microbiology.2022; 60(2): 207. CrossRef

Regulator of ribonuclease activity modulates the pathogenicity of Vibrio vulnificus: Jaejin Lee , Eunkyoung Shin , Jaeyeong Park , Minho Lee , Kangseok Lee; J. Microbiol. 2021;59(12):1133-1141. Published online November 9, 2021; DOI: https://doi.org/10.1007/s12275-021-1518-5

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Abstract

RraA, a protein regulator of RNase E activity, plays a unique role in modulating the mRNA abundance in Escherichia coli. The marine pathogenic bacterium Vibrio vulnificus also possesses homologs of RNase E (VvRNase E) and RraA (VvRraA1 and VvRraA2). However, their physiological roles have not yet been investigated. In this study, we demonstrated that VvRraA1 expression levels affect the pathogenicity of V. vulnificus. Compared to the wild-type strain, the VvrraA1-deleted strain (ΔVvrraA1) showed decreased motility, invasiveness, biofilm formation ability as well as virulence in mice; these phenotypic changes of ΔVvrraA1 were restored by the exogenous expression of VvrraA1. Transcriptomic analysis indicated that VvRraA1 expression levels affect the abundance of a large number of mRNA species. Among them, the halflives of mRNA species encoding virulence factors (e.g., smcR and htpG) that have been previously shown to affect VvrraA1 expression-dependent phenotypes were positively correlated with VvrraA1 expression levels. These findings suggest that VvRraA1 modulates the pathogenicity of V. vulnificus by regulating the abundance of a subset of mRNA species.

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Identification of the global regulatory roles of RraA via the integrative transcriptome and proteome in Vibrio alginolyticus
Huizhen Chen, Qian Gao, Bing Liu, Ying Zhang, Jianxiang Fang, Songbiao Wang, Youqi Chen, Chang Chen, Nicolas E. Buchler
mSphere.2024;[Epub] CrossRef
Comparative Transcriptomic Analysis of Flagellar-Associated Genes in Salmonella Typhimurium and Its rnc Mutant
Seungmok Han, Ji-Won Byun, Minho Lee
Journal of Microbiology.2024; 62(1): 33. CrossRef
Eco-Evolutionary Drivers of Vibrio parahaemolyticus Sequence Type 3 Expansion: Retrospective Machine Learning Approach
Amy Marie Campbell, Chris Hauton, Ronny van Aerle, Jaime Martinez-Urtaza
JMIR Bioinformatics and Biotechnology.2024; 5: e62747. CrossRef
Relaxed Cleavage Specificity of Hyperactive Variants of Escherichia coli RNase E on RNA I
Dayeong Bae, Hana Hyeon, Eunkyoung Shin, Ji-Hyun Yeom, Kangseok Lee
Journal of Microbiology.2023; 61(2): 211. CrossRef
Regulator of RNase E activity modulates the pathogenicity of Salmonella Typhimurium
Jaejin Lee, Eunkyoung Shin, Ji-Hyun Yeom, Jaeyoung Park, Sunwoo Kim, Minho Lee, Kangseok Lee
Microbial Pathogenesis.2022; 165: 105460. CrossRef

Short-chain fatty acids inhibit the biofilm formation of Streptococcus gordonii through negative regulation of competence-stimulating peptide signaling pathway: Taehwan Park , Jintaek Im , A Reum Kim , Dongwook Lee , Sungho Jeong , Cheol-Heui Yun , Seung Hyun Han; J. Microbiol. 2021;59(12):1142-1149. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1576-8

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Abstract

Streptococcus gordonii, a Gram-positive commensal bacterium, is an opportunistic pathogen closely related to initiation and progression of various oral diseases, such as periodontitis and dental caries. Its biofilm formation is linked with the development of such diseases by enhanced resistance against antimicrobial treatment or host immunity. In the present study, we investigated the effect of short-chain fatty acids (SCFAs) on the biofilm formation of S. gordonii. SCFAs, including sodium acetate (NaA), sodium propionate (NaP), and sodium butyrate (NaB), showed an effective inhibitory activity on the biofilm formation of S. gordonii without reduction in bacterial growth. SCFAs suppressed S. gordonii biofilm formation at early time points whereas SCFAs did not affect its preformed biofilm. A quorum-sensing system mediated by competence-stimulating peptide (CSP) is known to regulate biofilm formation of streptococci. Interestingly, SCFAs substantially decreased mRNA expression of comD and comE, which are CSP-sensor and its response regulator responsible for CSP pathway, respectively. Although S. gordonii biofilm formation was enhanced by exogenous synthetic CSP treatment, such effect was not observed in the presence of SCFAs. Collectively, these results suggest that SCFAs have an anti-biofilm activity on S. gordonii through inhibiting comD and comE expression which results in negative regulation of CSP quorum-sensing system. SCFAs could be an effective anti-biofilm agent against S. gordonii for the prevention of oral diseases.

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Sehyeok Im, Jun Hyuck Lee, Youn-Soo Shim
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Menghe Liu, Ru Peng, Chunfang Tian, Jianping Shi, Jiannan Ma, Ruiwen Shi, Xiao Qi, Rongwei Zhao, Haibin Guan
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Yumeng Wang, Shixi Xu, Qiurong He, Kun Sun, Xiaowan Wang, Xiaorui Zhang, Yuqing Li, Jumei Zeng
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Listening to enteric bacteria from the perspective of antibiotic alternatives in animal husbandry
Leli Wang, Yiru Zhang, Juan Xu, Qingqing Shi, Yao Peng, Cimin Long, Lan Li, Yulong Yin
The Innovation Life.2023; 1(2): 100022. CrossRef
The Complicated Relationship of Short-Chain Fatty Acids and Oral Microbiome: A Narrative Review
Georgy E. Leonov, Yurgita R. Varaeva, Elena N. Livantsova, Antonina V. Starodubova
Biomedicines.2023; 11(10): 2749. CrossRef
Social networking at the microbiome-host interface
Richard J. Lamont, George Hajishengallis, Hyun Koo, Anthony R. Richardson
Infection and Immunity.2023;[Epub] CrossRef
Making Sense of Quorum Sensing at the Intestinal Mucosal Interface
Friederike Uhlig, Niall P. Hyland
Cells.2022; 11(11): 1734. CrossRef
Food-Grade Bacteria Combat Pathogens by Blocking AHL-Mediated Quorum Sensing and Biofilm Formation
Kirsi Savijoki, Paola San-Martin-Galindo, Katriina Pitkänen, Minnamari Edelmann, Annika Sillanpää, Cim van der Velde, Ilkka Miettinen, Jayendra Z. Patel, Jari Yli-Kauhaluoma, Mataleena Parikka, Adyary Fallarero, Pekka Varmanen
Foods.2022; 12(1): 90. CrossRef
Innate immunity and microbial dysbiosis in hidradenitis suppurativa – vicious cycle of chronic inflammation
Divya Chopra, Rachel A. Arens, Watcharee Amornpairoj, Michelle A. Lowes, Marjana Tomic-Canic, Natasa Strbo, Hadar Lev-Tov, Irena Pastar
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Drugs for the Quorum Sensing Inhibition of Oral Biofilm: New Frontiers and Insights in the Treatment of Periodontitis
Alessandro Polizzi, Martina Donzella, Giada Nicolosi, Simona Santonocito, Paolo Pesce, Gaetano Isola
Pharmaceutics.2022; 14(12): 2740. CrossRef

Randomized Controlled Trial

Ulmus macrocarpa Hance extract modulates intestinal microbiota in healthy adults: a randomized, placebo-controlled clinical trial: Kwangmin Kim , Karpagam Veerappan , Nahyun Woo , Bohyeon Park , Sathishkumar Natarajan , Hoyong Chung , Cheolmin Kim , Junhyung Park; J. Microbiol. 2021;59(12):1150-1156. Published online October 26, 2021; DOI: https://doi.org/10.1007/s12275-021-1329-8

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Abstract

The stem and root bark of Ulmus macrocarpa Hance has been used as traditional pharmacological agent against inflammation related disorders. The objective of this study was to explore the impact of Ulmus macrocarpa Hance extract (UME) on human gut microbiota. A randomized placebo-controlled clinical study was conducted in healthy adults. The study subjects were given 500 mg/day of UME or placebo orally for 4 weeks. Eighty fecal samples were collected at baseline and 4 weeks of UME or placebo intervention. The gut microbiota variation was evaluated by 16S rRNA profiling. The microbial response was highly personalized, and no statistically significant differences was observed in both species richness and abundance. The number of bacterial species identified in study subjects ranged from 86 to 182 species. The analysis for taxonomical changes revealed an increase in Eubacterium ventriosum, Blautia faecis, Ruminococcus gnavus in the UME group. Functional enrichment of bacterial genes showed an increase in primary and secondary bile acid biosynthesis in UME group. Having known from previous studies Eubacterium regulated bile acid homeostasis in protecting gut microbial architecture and immunity, we suggest that UME supplementation might enhance host immunity by modulating gut microbiota. This is the first stage study and forthcoming clinical studies with larger participants are needed to confirm these findings.

Citations

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