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Guo Y, Shao J, Wu Y, Li Y. Using Wolbachia to control rice planthopper populations: progress and challenges. Front Microbiol 2023; 14:1244239. [PMID: 37779725 PMCID: PMC10537216 DOI: 10.3389/fmicb.2023.1244239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/24/2023] [Indexed: 10/03/2023] Open
Abstract
Wolbachia have been developed as a tool for protecting humans from mosquito populations and mosquito-borne diseases. The success of using Wolbachia relies on the facts that Wolbachia are maternally transmitted and that Wolbachia-induced cytoplasmic incompatibility provides a selective advantage to infected over uninfected females, ensuring that Wolbachia rapidly spread through the target pest population. Most transinfected Wolbachia exhibit a strong antiviral response in novel hosts, thus making it an extremely efficient technique. Although Wolbachia has only been used to control mosquitoes so far, great progress has been made in developing Wolbachia-based approaches to protect plants from rice pests and their associated diseases. Here, we synthesize the current knowledge about the important phenotypic effects of Wolbachia used to control mosquito populations and the literature on the interactions between Wolbachia and rice pest planthoppers. Our aim is to link findings from Wolbachia-mediated mosquito control programs to possible applications in planthoppers.
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Affiliation(s)
| | | | | | - Yifeng Li
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural Affairs, Guangzhou, China
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Su Z, Liu G, Liu X, Li S, Lu X, Wang P, Zhao W, Zhang X, Dong L, Qu Y, Zhang J, Mo S, Guo Q, Ma P. Functional Analyses of the Bacillus velezensis HMB26553 Genome Provide Evidence That Its Genes Are Potentially Related to the Promotion of Plant Growth and Prevention of Cotton Rhizoctonia Damping-Off. Cells 2023; 12:cells12091301. [PMID: 37174701 PMCID: PMC10177454 DOI: 10.3390/cells12091301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 04/18/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
Bacillus spp. is one kind of the important representative biocontrol agents against plant diseases and promoting plant growth. In this study, the whole genomic sequence of bacterial strain HMB26553 was obtained. A phylogenetic tree based on the genome and ANI (average nucleotide identity), as well as dDDH (digital DNA-DNA hybridization), was constructed, and strain HMB26553 was identified as Bacillus velezensis. Fourteen biosynthetic gene clusters responsible for secondary metabolite were predicted via anti-SMASH, and six secondary metabolites were identified by UHPLC-QTOF-MS/MS (ultra-high-performance liquid chromatography coupled to quadrupole-time-of-flight tandem mass spectrometry). When the phytopathogen Rhizoctonia solani was treated with B. velezensis HMB26553, the mycelial structure changed, ROS (reactive oxygen species) accumulated, and the mitochondrial membrane potential decreased. Characteristics of strain HMB26553 were predicted and confirmed by genomic information and experiments, such as producing IAA, siderophore, extracellular enzymes and biofilm, as well as moving and promoting cotton growth. All these results suggested the mechanisms by which B. velezensis HMB26553 inhibits pathogen growth and promotes cotton growth, which likely provided the potential biocontrol agent to control cotton Rhizoctonia damping-off.
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Affiliation(s)
- Zhenhe Su
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Gaoge Liu
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Xiaomeng Liu
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Shezeng Li
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Xiuyun Lu
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Peipei Wang
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Weisong Zhao
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Xiaoyun Zhang
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Lihong Dong
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Yuanhang Qu
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Jiaqi Zhang
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Shaojing Mo
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Qinggang Guo
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
| | - Ping Ma
- Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Integrated Pest Management Innovation Center of Hebei Province, Key Laboratory of IPM on Crops in Northern Region of North China, Ministry of Agriculture and Rural Affairs of China, Baoding 071000, China
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Shemshad N, Nasiraie LR, Heravi RM. Evaluation of the health properties of lactobacilli isolated from an Iranian traditional dairy product. Lett Appl Microbiol 2023; 76:6918845. [PMID: 36794887 DOI: 10.1093/lambio/ovac058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 11/30/2022] [Accepted: 12/14/2022] [Indexed: 02/17/2023]
Abstract
The different lactobacillus strains isolated from dairy resources may have unique functional properties on human health. Thus, the present study aimed to evaluate the health properties of the lactobacilli isolated from a traditional dairy product in vitro. A total of seven isolated lactobacilli abilities were evaluated for environmental pH reduction, antibacterial activity, cholesterol reduction, and antioxidant activity. Based on the results, the highest decrease in the environment pH was observed in Lactobacillusfermentum B166 with 57%. The antipathogen activity test showed the best results for inhibiting Salmonella typhimurium and Pseudomonas aeruginosa to be obtained by Lact. fermentum 10-18 and Lact. brevis SKB1021 strains, respectively. However, Lact. plantarum H1 and Lact. plantarum PS7319 represented the maximum activity in preventing Escherichia coli; also, Lact. fermentum APBSMLB166 inhibited Staphylococcus aureus more than other strains. Additionally, Lact. crustorum B481 and fermentum 10-18 strains significantly led to a higher reduction in the medium cholesterol than the other strains. The results of antioxidant tests demonstrated that Lact. brevis SKB1021 and Lact. fermentum B166 inhabited radical substrate significantly more than the other lactobacilli. Therefore, four lactobacilli isolated from a traditional dairy product improved some safety indexes positively; thus, they are suggested to be used in manufacturing probiotic supplements.
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Affiliation(s)
- Nina Shemshad
- Department of Food Science and Technology, Nour Branch, Islamic Azad University Chamestan road, Nour 4641859557, Iran
| | - Leila Roozbeh Nasiraie
- Department of Food Science and Technology, Nour Branch, Islamic Azad University Chamestan road, Nour 4641859557, Iran.,Research and Development Center, Shams Bavaran Salamat Nour Consulting and Production Services, Amol, Iran
| | - Reza Majidzadeh Heravi
- Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Azadi square 9177948944, Mashhad, Iran
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Pino A, Vaccalluzzo A, Caggia C, Balzaretti S, Vanella L, Sorrenti V, Ronkainen A, Satokari R, Randazzo CL. Lacticaseibacillus rhamnosus CA15 (DSM 33960) as a Candidate Probiotic Strain for Human Health. Nutrients 2022; 14. [PMID: 36432588 DOI: 10.3390/nu14224902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
Lactobacilli with probiotic properties have emerged as promising tools for both the prevention and treatment of vaginal dysbiosis. The present study aimed to study the in vitro probiotic potential of the Lacticaseibacillus rhamnosus CA15 (DSM 33960) strain isolated from a healthy vaginal ecosystem. The strain was evaluated for both functional (antagonistic activity against pathogens; H2O2, organic acid, and lactic acid production; antioxidant and anti-inflammatory activities; ability to adhere to intestinal mucus and to both CaCo-2 and VK7/E6E7 cell lines; exopolysaccharide production; surface properties; and ability to survive during gastrointestinal transit) and safety (hemolytic, DNase, and gelatinase activities; mucin degradation ability; production of biogenic amines; and resistance to antimicrobials) characteristics. Data revealed that the tested strain was able to antagonize a broad spectrum of vaginal pathogens. In addition, the adhesion capacity to both vaginal and intestinal cell lines, as well as anti-inflammatory and antioxidant activities, was detected. The ability of the Lacticaseibacillus rhamnosus CA15 (DSM 33960) strain to survive under harsh environmental conditions occurring during the gastrointestinal passage suggests its possible oral delivery. Thus, in vitro data highlighted interesting probiotic properties of the CA15 (DSM 33960) strain, which could represent a valuable candidate for in vivo vaginal infections treatment.
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Hu MX, He F, Guo YX, Mo LZ, Zhu X. Lactobacillus reuteri Biofilms Inhibit Pathogens and Regulate Microbiota in In Vitro Fecal Fermentation. J Agric Food Chem 2022; 70:11935-11943. [PMID: 36111836 DOI: 10.1021/acs.jafc.2c02372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Bacteria colonizing the gastrointestinal tract generally grow well in biofilms. In recent years, probiotic biofilms have been considered the most promising fourth-generation probiotics. However, the research into the functions of probiotic biofilms is just starting. In this study, Lactobacillus reuteri DSM 17938 biofilms formed on electrospun cellulose acetate nanofibrous scaffolds were contrasted with planktonic cells. Pathogen inhibition analysis of Escherichia coli, Staphylococcus aureus, and Listeria monocytogenes suggested a significant distinction between the planktonic and biofilm groups. In human fecal fermentation, L. reuteri remodeled the microbiota by decreasing the relative abundances of Proteobacteria, Escherichia-Shigella, and Desulfovibrio and increasing the relative abundances of Phascolarctobacterium, Bacteroides, and Lactobacillus. Moreover, L. reuteri biofilms played more positive roles in microbiota modulation and short-chain fatty acid production than planktonic L. reuteri. These findings provide an understanding of the beneficial effects of probiotic biofilms, laying a foundation for the application of probiotic biofilms as a health promoter.
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Affiliation(s)
- Meng-Xin Hu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Fei He
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Ya-Xin Guo
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Li-Zhen Mo
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Xuan Zhu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China
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Gorreja F, Walker WA. The potential role of adherence factors in probiotic function in the gastrointestinal tract of adults and pediatrics: a narrative review of experimental and human studies. Gut Microbes 2022; 14:2149214. [PMID: 36469568 PMCID: PMC9728474 DOI: 10.1080/19490976.2022.2149214] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 11/15/2022] [Indexed: 12/12/2022] Open
Abstract
Numerous studies point to the important role of probiotic bacteria in gastrointestinal health. Probiotics act through mechanisms affecting enteric pathogens, epithelial barrier function, immune signaling, and conditioning of indigenous microbiota. Once administered, probiotics reach the gastrointestinal tract and interact with the host through bacterial surface molecules, here called adhesion factors, which are either strain- or specie-specific. Probiotic adhesion, through structural adhesion factors, is a mechanism that facilitates persistence within the gastrointestinal tract and triggers the initial host responses. Thus, an understanding of specific probiotic adhesion mechanisms could predict how specific probiotic strains elicit benefits and the potential of adherence factors as a proxy to predict probiotic function. This review summarizes the present understanding of probiotic adherence in the gastrointestinal tract. It highlights the bacterial adhesion structure types, their molecular communication with the host and the consequent impact on intestinal diseases in both adult and pediatric populations. Finally, we discuss knockout/isolation studies as direct evidence for adhesion factors conferring anti-inflammatory and pathogen inhibition properties to a probiotic.What is known: Probiotics can be used to treat clinical conditions.Probiotics improve dysbiosis and symptoms.Clinical trials may not confirm in vitro and animal studies.What is new: Adhesion structures may be important for probiotic function.Need to systematically determine physical characteristics of probiotics before selecting for clinical trials.Probiotics may be genetically engineered to add to clinical efficacy.
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Affiliation(s)
- Frida Gorreja
- Department of Microbiology and Immunology, Institute for Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Nutrition-Gut-Brain Interactions Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - W. Allan Walker
- Mucosal Immunology and Biology Research Center, Massachusetts General Hospital for Children, Harvard Medical School, Boston, Massachusetts, USA
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Tegtmeier D, Hurka S, Mihajlovic S, Bodenschatz M, Schlimbach S, Vilcinskas A. Culture-Independent and Culture-Dependent Characterization of the Black Soldier Fly Gut Microbiome Reveals a Large Proportion of Culturable Bacteria with Potential for Industrial Applications. Microorganisms 2021; 9:1642. [PMID: 34442721 PMCID: PMC8398798 DOI: 10.3390/microorganisms9081642] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/21/2021] [Accepted: 07/23/2021] [Indexed: 12/14/2022] Open
Abstract
Black soldier fly larvae (BSFL) are fast-growing, resilient insects that can break down a variety of organic substrates and convert them into valuable proteins and lipids for applications in the feed industry. Decomposition is mediated by an abundant and versatile gut microbiome, which has been studied for more than a decade. However, little is known about the phylogeny, properties and functions of bacterial isolates from the BSFL gut. We therefore characterized the BSFL gut microbiome in detail, evaluating bacterial diversity by culture-dependent methods and amplicon sequencing of the 16S rRNA gene. Redundant strains were identified by genomic fingerprinting and 105 non-redundant isolates were then tested for their ability to inhibit pathogens. We cultivated representatives of 26 genera, covering 47% of the families and 33% of the genera detected by amplicon sequencing. Among these isolates, we found several representatives of the most abundant genera: Morganella, Enterococcus, Proteus and Providencia. We also isolated diverse members of the less-abundant phylum Actinobacteria, and a novel genus of the order Clostridiales. We found that 15 of the isolates inhibited at least one of the tested pathogens, suggesting a role in helping to prevent colonization by pathogens in the gut. The resulting culture collection of unique BSFL gut bacteria provides a promising resource for multiple industrial applications.
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Affiliation(s)
- Dorothee Tegtmeier
- Branch for Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), 35392 Giessen, Germany; (S.M.); (M.B.); (S.S.)
| | - Sabine Hurka
- Institute for Insect Biotechnology, Justus Liebig University, 35392 Giessen, Germany;
| | - Sanja Mihajlovic
- Branch for Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), 35392 Giessen, Germany; (S.M.); (M.B.); (S.S.)
| | - Maren Bodenschatz
- Branch for Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), 35392 Giessen, Germany; (S.M.); (M.B.); (S.S.)
| | - Stephanie Schlimbach
- Branch for Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), 35392 Giessen, Germany; (S.M.); (M.B.); (S.S.)
| | - Andreas Vilcinskas
- Branch for Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), 35392 Giessen, Germany; (S.M.); (M.B.); (S.S.)
- Institute for Insect Biotechnology, Justus Liebig University, 35392 Giessen, Germany;
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Campbell LJ, Burger J, Zappalorti RT, Bunnell JF, Winzeler ME, Taylor DR, Lorch JM. Soil Reservoir Dynamics of Ophidiomyces ophidiicola, the Causative Agent of Snake Fungal Disease. J Fungi (Basel) 2021; 7:461. [PMID: 34201162 DOI: 10.3390/jof7060461] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 06/03/2021] [Accepted: 06/04/2021] [Indexed: 11/16/2022] Open
Abstract
Wildlife diseases pose an ever-growing threat to global biodiversity. Understanding how wildlife pathogens are distributed in the environment and the ability of pathogens to form environmental reservoirs is critical to understanding and predicting disease dynamics within host populations. Snake fungal disease (SFD) is an emerging conservation threat to North American snake populations. The causative agent, Ophidiomyces ophidiicola (Oo), is detectable in environmentally derived soils. However, little is known about the distribution of Oo in the environment and the persistence and growth of Oo in soils. Here, we use quantitative PCR to detect Oo in soil samples collected from five snake dens. We compare the detection rates between soils collected from within underground snake hibernacula and associated, adjacent topsoil samples. Additionally, we used microcosm growth assays to assess the growth of Oo in soils and investigate whether the detection and growth of Oo are related to abiotic parameters and microbial communities of soil samples. We found that Oo is significantly more likely to be detected in hibernaculum soils compared to topsoils. We also found that Oo was capable of growth in sterile soil, but no growth occurred in soils with an active microbial community. A number of fungal genera were more abundant in soils that did not permit growth of Oo, versus those that did. Our results suggest that soils may display a high degree of both general and specific suppression of Oo in the environment. Harnessing environmental suppression presents opportunities to mitigate the impacts of SFD in wild snake populations.
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Sommermeyer H, Pituch HM, Wultanska D, Wojtyla-Buciora P, Piatek J, Bernatek M. Inhibition of Quinolone- and Multi-Drug-Resistant Clostridioides Difficile Strains by Multi Strain Synbiotics-An Option for Diarrhea Management in Nursing Facilities. Int J Environ Res Public Health 2021; 18:ijerph18115871. [PMID: 34070727 PMCID: PMC8198539 DOI: 10.3390/ijerph18115871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 05/18/2021] [Accepted: 05/28/2021] [Indexed: 12/17/2022]
Abstract
Diarrhea is a common problem in nursing homes. A survey among nursing facilities in Poland was used to characterize diarrhea outbreaks, the burden caused for residents and caregivers and the employed measures. Survey results confirmed that diarrhea is a common problem in nursing homes and in most cases affects groups of residents. The related burden is high or very high for 27% of residents and 40% of caregivers. In 80% of nursing facilities pro or synbiotics are part of the measures used to manage diarrhea. Administration of these kinds of products has been suggested for the management of diarrhea, especially in cases caused by Clostridioides (C.) difficile. C. difficile is one of many potential causes for diarrhea, but is of particular concern for nursing homes because it is responsible for a large proportion of diarrhea outbreaks and is often caused by multi-drug resistant strains. In vitro inhibition of a quinolone-resistant and a multi-drug resistant C. difficile strain was used to evaluate the growth inhibitory effects of commonly used products containing probiotic microorganisms. Growth of both strains was best inhibited by multi-strain synbiotic preparations. These findings suggest that multi-strain synbiotics can be considered as an interventional option for diarrhea caused by C. difficile.
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Affiliation(s)
- Henning Sommermeyer
- Department of Health Sciences, Calisia University-Kalisz, Nowy Swiat 4, 62-800 Kalisz, Poland; (H.S.); (P.W.-B.); (M.B.)
| | - Hanna M. Pituch
- Department of Medical Microbiology, Medical University of Warsaw, ul. Żwirki i Wigury 61, 02-091 Warsaw, Poland; (H.M.P.); (D.W.)
| | - Dorota Wultanska
- Department of Medical Microbiology, Medical University of Warsaw, ul. Żwirki i Wigury 61, 02-091 Warsaw, Poland; (H.M.P.); (D.W.)
| | - Paulina Wojtyla-Buciora
- Department of Health Sciences, Calisia University-Kalisz, Nowy Swiat 4, 62-800 Kalisz, Poland; (H.S.); (P.W.-B.); (M.B.)
| | - Jacek Piatek
- Department of Health Sciences, Calisia University-Kalisz, Nowy Swiat 4, 62-800 Kalisz, Poland; (H.S.); (P.W.-B.); (M.B.)
- Correspondence: ; Tel.: +48-883389788
| | - Malgorzata Bernatek
- Department of Health Sciences, Calisia University-Kalisz, Nowy Swiat 4, 62-800 Kalisz, Poland; (H.S.); (P.W.-B.); (M.B.)
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Hascoët AS, Ripolles-Avila C, Cervantes-Huamán BRH, Rodríguez-Jerez JJ. In Vitro Preformed Biofilms of Bacillus safensis Inhibit the Adhesion and Subsequent Development of Listeria monocytogenes on Stainless-Steel Surfaces. Biomolecules 2021; 11:475. [PMID: 33810177 PMCID: PMC8004596 DOI: 10.3390/biom11030475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/15/2021] [Accepted: 03/18/2021] [Indexed: 01/27/2023] Open
Abstract
Listeria monocytogenes continues to be one of the most important public health challenges for the meat sector. Many attempts have been made to establish the most efficient cleaning and disinfection protocols, but there is still the need for the sector to develop plans with different lines of action. In this regard, an interesting strategy could be based on the control of this type of foodborne pathogen through the resident microbiota naturally established on the surfaces. A potential inhibitor, Bacillus safensis, was found in a previous study that screened the interaction between the resident microbiota and L. monocytogenes in an Iberian pig processing plant. The aim of the present study was to evaluate the effect of preformed biofilms of Bacillus safensis on the adhesion and implantation of 22 strains of L. monocytogenes. Mature preformed B. safensis biofilms can inhibit adhesion and the biofilm formation of multiple L. monocytogenes strains, eliminating the pathogen by a currently unidentified mechanism. Due to the non-enterotoxigenic properties of B. safensis, its presence on certain meat industry surfaces should be favored and it could represent a new way to fight against the persistence of L. monocytogenes in accordance with other bacterial inhibitors and hygiene operations.
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Affiliation(s)
| | | | | | - José Juan Rodríguez-Jerez
- Human Nutrition and Food Science Area, Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona (UAB), Edifici V-Campus de la UAB, 08193 Bellaterra (Cerdanyola del Vallès), Barcelona, Spain; (A.-S.H.); (C.R.-A.); (B.R.H.C.-H.)
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Ghimire S, Roy C, Wongkuna S, Antony L, Maji A, Keena MC, Foley A, Scaria J. Identification of Clostridioides difficile-Inhibiting Gut Commensals Using Culturomics, Phenotyping, and Combinatorial Community Assembly. mSystems 2020; 5:e00620-19. [PMID: 32019832 DOI: 10.1128/mSystems.00620-19] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
A major function of the gut microbiota is to provide colonization resistance, wherein pathogens are inhibited or suppressed below infectious levels. However, the fraction of gut microbiota required for colonization resistance remains unclear. We used culturomics to isolate a gut microbiota culture collection comprising 1,590 isolates belonging to 102 species. This culture collection represents 34.57% of the taxonomic diversity and 70% functional capacity, as estimated by metagenomic sequencing of the fecal samples used for culture. Using whole-genome sequencing, we characterized species representatives from this collection and predicted their phenotypic traits, further characterizing isolates by defining nutrient utilization profiles and short-chain fatty acid production. When screened with a coculture assay, 66 species in our culture collection inhibited Clostridioides difficile Several phenotypes, particularly, growth rate, production of SCFAs, and the utilization of mannitol, sorbitol, or succinate, correlated with C. difficile inhibition. We used a combinatorial community assembly approach to formulate defined bacterial mixes inhibitory to C. difficile We tested 256 combinations and found that both species composition and blend size were important in inhibition. Our results show that the interaction of bacteria with one another in a mix and with other members of gut commensals must be investigated to design defined bacterial mixes for inhibiting C. difficile in vivo IMPORTANCE Antibiotic treatment causes instability of gut microbiota and the loss of colonization resistance, thus allowing pathogens such as Clostridioides difficile to colonize and causing recurrent infection and mortality. Although fecal microbiome transplantation has been shown to be an effective treatment for C. difficile infection (CDI), a more desirable approach would be the use of a defined mix of inhibitory gut bacteria. The C. difficile-inhibiting species and bacterial combinations identified herein improve the understanding of the ecological interactions controlling colonization resistance against C. difficile and could aid in the design of defined bacteriotherapy as a nonantibiotic alternative against CDI.
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Dundore-Arias JP, Castle SC, Felice L, Dill-Macky R, Kinkel LL. Carbon Amendments Influence Composition and Functional Capacities of Indigenous Soil Microbiomes. Front Mol Biosci 2020; 6:151. [PMID: 31993439 PMCID: PMC6964746 DOI: 10.3389/fmolb.2019.00151] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 12/10/2019] [Indexed: 02/01/2023] Open
Abstract
Soil nutrient amendments are recognized for their potential to improve microbial activity and biomass in the soil. However, the specific selective impacts of carbon amendments on indigenous microbiomes and their metabolic functions in agricultural soils remain poorly understood. We investigated the changes in soil chemical characteristics and phenotypes of Streptomyces communities following carbon amendments to soil. Mesocosms were established with soil from two field sites varying in soil organic matter content (low organic matter, LOM; high organic matter, HOM), that were amended at intervals over nine months with low or high dose solutions of glucose, fructose, malic acid, a mixture of these compounds, or water only (non-amended control). Significant shifts in soil chemical characteristics and antibiotic inhibitory capacities of indigenous Streptomyces were observed in response to carbon additions. All high dose carbon amendments consistently increased soil total carbon, while amendments with malic acid decreased soil pH. In LOM soils, higher frequencies of Streptomyces inhibitory phenotypes of the two plant pathogens, Streptomyces scabies and Fusarium oxysporum, were observed in response to soil carbon additions. Additionally, to determine if shifts in Streptomyces functional characteristics correlated with microbiome composition, we investigated whether shifts in functional characteristics of soil Streptomyces correlated with composition of soil bacterial communities, analyzed using 16S rRNA gene sequencing. Regardless of dose, community composition differed significantly among carbon-amended and non-amended soils from both sites. Carbon type and dose had significant effects on bacterial community composition in both LOM and HOM soils. Relationships among microbial community richness (observed species number), diversity, and soil characteristics varied among soils from different sites. These results suggest that manipulation of soil resource availability has the potential to selectively modify the functional capacities of soil microbiomes, and specifically to enhance pathogen inhibitory populations of high value to agricultural systems.
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Affiliation(s)
- José Pablo Dundore-Arias
- Department of Biology and Chemistry, California State University, Monterey Bay, Seaside, CA, United States.,Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
| | - Sarah C Castle
- Plant Science Research Unit, USDA-ARS, Saint Paul, MN, United States
| | - Laura Felice
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
| | - Ruth Dill-Macky
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
| | - Linda L Kinkel
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN, United States
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Gelinski JMLN, Baratto CM, Casagrande M, de Oliveira TP, Megiolaro F, de Martini Soares FAS, de Souza EMB, Vicente VA, Fonseca GG. Control of pathogens in fresh pork sausage by inclusion of Lactobacillus sakei BAS0117. Can J Microbiol 2019; 65:831-841. [PMID: 31310729 DOI: 10.1139/cjm-2019-0136] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A pork sausage was produced with low sodium content (1.64%) to which Lactobacillus sakei was added with the aim of developing a meat pork sausage for cooking and having technological, organoleptic, and hygienic advantages. The lactic acid bacteria (LAB) L. sakei, Lactococcus sp., and Pediococcus pentosaceus were submitted to extreme pH, temperature, and NaCl conditions. Lactobacillus sakei was used in pork sausage because of its resistance to different culture conditions and its antimicrobial potential. The food-borne pathogens Listeria monocytogenes Scott A, Enterococcus faecalis, and Staphylococcus aureus were used as indicator microorganisms to evaluate the antimicrobial activity of selected LAB strains. Salmonella enterica serotype Choleraesuis is a common pathogen of pigs. To the raw sausage product containing L. sakei and nonpathogenic endogenous microbiota, we added about >104 and <105 CFU/g of S. enterica serotype Choleraesuis to evaluate the inhibitory potential of L. sakei towards this pathogen. Salmonella Choleraesuis was inhibited in the presence of L. sakei over 7 days of storage of the meat product (about 3.0 log cycles reduction). Lactobacillus sakei significantly increased inhibition when compared with the nonfermented sausage. Thus, L. sakei BAS0117 played an important role as an additional hurdle in the fermented meat pork sausage during storage.
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Jakobsen LMA, Sundekilde UK, Andersen HJ, Nielsen DS, Bertram HC. Lactose and Bovine Milk Oligosaccharides Synergistically Stimulate B. longum subsp. longum Growth in a Simplified Model of the Infant Gut Microbiome. J Proteome Res 2019; 18:3086-3098. [PMID: 31264424 DOI: 10.1021/acs.jproteome.9b00211] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Increasing awareness of the importance of a healthy Bifidobacterium-rich microbiome has led to a need for more knowledge on how different prebiotic carbohydrates specifically impact the infant microbiome, especially as a community instead of single bacterial targets. In this study, we combined proton nuclear magnetic resonance (1H NMR) metabolomics and molecular biology methods for quantification of bacteria to compare the prebiotic effect of bovine milk oligosaccharides (BMO) and synthetic galacto oligosaccharides (GOS) using mono- and cocultures of eight major bacteria related to a healthy infant microbiome. The results revealed that BMO treatments supported growth of Bifidobacterium longum subsp. longum and Parabacteroides distasonis, while at the same time growth of Clostridium perfringens and Escherichia coli was inhibited. In addition, there was a synergistic effect of combining lactose and BMO in regards to reducing C. perfringens, maintaining stable numbers of P. distasonis and simultaneously increasing numbers of the beneficial B. longum subsp. longum. These results indicate that the oligosaccharide composition plays a vital role in shaping the developing microbiota.
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Affiliation(s)
- Louise M A Jakobsen
- Department of Food Science , Aarhus University , Kirstinebjergvej 10 , Årslev 5792 , Denmark
| | - Ulrik K Sundekilde
- Department of Food Science , Aarhus University , Kirstinebjergvej 10 , Årslev 5792 , Denmark
| | - Henrik J Andersen
- Arla Food Ingredients Group P/S , Sønderhøj 10 , Viby J 8260 , Denmark
| | - Dennis S Nielsen
- Department of Food Science , University of Copenhagen , Rolighedsvej 30 , Frederiksberg C 1958 , Denmark
| | - Hanne C Bertram
- Department of Food Science , Aarhus University , Kirstinebjergvej 10 , Årslev 5792 , Denmark
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15
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Medina Fernández S, Cretenet M, Bernardeau M. In vitro inhibition of avian pathogenic Enterococcus cecorum isolates by probiotic Bacillus strains. Poult Sci 2019; 98:2338-2346. [PMID: 30668801 PMCID: PMC6527510 DOI: 10.3382/ps/pey593] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 12/20/2018] [Indexed: 12/04/2022] Open
Abstract
Enterococcus cecorum is a commensal bacteria and opportunistic pathogen that can cause outbreaks of Enterococcal spondylitis (“kinky back”) in poultry, with a growing concern worldwide. Numerous Bacillus-based probiotic strains are commercially available with proven effects in supporting gut health and growth performance, but efficacy against pathogenic E. cecorum is unknown. This study compared the in vitro inhibitory potential of cell-free supernatants (CFSs) of 18 Bacillus strains (14 commercial probiotic strains, 1 internal negative control and 3 type strains) on the growth of 9 clinical E. cecorum isolates. Standardized biomass cultures of live Bacillus were harvested and filtered to obtain CFSs. Inhibitory potential against E. cecorum isolates was assessed via a microdilution assay in which the final pathogen concentration was ∼ 104 CFU/mL. Absorbance (OD) was measured every 15 min for 15 h and used to calculate percentage growth inhibition at an OD equivalent to 0.4 in the positive control (PC) (pathogen but no CFS), and growth delay vs. PC. Growth kinetic responses of pathogen isolate-Bacillus strain combinations ranged from total pathogen inhibition to partial inhibition, lag in growth, no effect, or increased growth vs. PC. Percentage inhibition of individual isolates varied markedly among Bacillus strains, from 100% to −100% (growth promotion as recorded for the type strain) (B. amyloliquefaciens DSM7T). Five B. amyloliquefaciens CFSs produced higher average inhibition rates (>75%) than 2 out of 3 Bacillus licheniformis CFSs (−2.5, and −8.39% vs. PC, respectively) and 1 out of 2 Bacillus subtilis CFSs (7.3% vs. PC) (P < 0.05). Commercial strain 3AP4 exhibited the highest average percentage inhibition vs. PC (85.0% ± 7.9) and the most consistent inhibitory effect across pathogen isolates. The findings indicate that some commercially available poultry probiotic Bacillus strains are effective at inhibiting pathogenic E. cecorum in vitro, but effects are highly strain and pathogen isolate-dependent. Further work is required to confirm effects in vivo and isolate the inhibitory substances.
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Affiliation(s)
| | | | - Marion Bernardeau
- Normandie Université, UNICAEN, ABTE, 14000 Caen, France.,Danisco Animal Nutrition, DuPont Industrial Biosciences, Marlborough SN8 1XN, UK
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16
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Chenoll E, Moreno I, Sánchez M, Garcia-Grau I, Silva Á, González-Monfort M, Genovés S, Vilella F, Seco-Durban C, Simón C, Ramón D. Selection of New Probiotics for Endometrial Health. Front Cell Infect Microbiol 2019; 9:114. [PMID: 31058101 PMCID: PMC6481279 DOI: 10.3389/fcimb.2019.00114] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 04/01/2019] [Indexed: 01/01/2023] Open
Abstract
Microbiota is a crucial player in gynecologic health, in which bacteria can shift to a dysbiotic state triggering a pathogenic process. Based on an ecological understanding of the problem, the aim of this study is to select a potential probiotic strain to improve female reproductive tract based on its capacity to initially lower pH and to promote the reduction of pathogenic bacteria. Based on this rationale, strain Lactobacillus rhamnosus BPL005 was initially selected for its capacity to reduce in vitro pH levels and produce organic acids. Subsequently, strain L. rhamnosus BPL005 (CECT 8800) was demonstrated to have a protective role on endometrial infections in an in vitro model of bacterial colonization of primary endometrial epithelial cells with Atopobium vaginae, Gardnerella vaginalis, Propionibacterium acnes, and Streptococcus agalactiae. In this model, BPL005 when co-cultured with those pathogens was shown to lower pH and to produce organic acids, being lactic acid the most relevant. The co-cultivation of strain L. rhamnosus BPL005 with tested reference pathogens produced a significant reduction in P. acnes and St. agalactiae levels and a non-significant reduction in A. vaginae and G. vaginalis. The colonization of L. rhamnosus BPL005 in the culture decreased IL-6, IL-8, and MCP-1, heightened in the presence of pathogens, and increased IL-1RA and IL-1 beta. Finally, safety was evaluated showing no signs of cytotoxicity, irritation in vaginal tests, or allergic contact dermatitis potential through the Local Lymph Node Assay. Overall, these results show the potential of L. rhamnosus BPL005 strain as a probiotic in gynecological health.
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Affiliation(s)
- Empar Chenoll
- Biopolis SL/Archer Daniels Midland, R&D Department, Valencia, Spain
| | - Inmaculada Moreno
- Igenomix Foundation, Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain.,Igenomix SL, Research Department, Paterna, Spain
| | - María Sánchez
- Biopolis SL/Archer Daniels Midland, R&D Department, Valencia, Spain
| | - Iolanda Garcia-Grau
- Igenomix Foundation, Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain.,Department of Obstetrics and Gynecology, University of Valencia, Valencia, Spain
| | - Ángela Silva
- Biopolis SL/Archer Daniels Midland, R&D Department, Valencia, Spain
| | | | - Salvador Genovés
- Biopolis SL/Archer Daniels Midland, R&D Department, Valencia, Spain
| | - Felipe Vilella
- Igenomix Foundation, Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain
| | | | - Carlos Simón
- Igenomix Foundation, Instituto de Investigación Sanitaria Hospital Clínico (INCLIVA), Valencia, Spain.,Igenomix SL, Research Department, Paterna, Spain.,Department of Obstetrics and Gynecology, University of Valencia, Valencia, Spain.,Department of Obstetrics and Gynecology, School of Medicine, Stanford University, Palo Alto, CA, United States
| | - Daniel Ramón
- Biopolis SL/Archer Daniels Midland, R&D Department, Valencia, Spain
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17
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Agamennone V, Roelofs D, van Straalen NM, Janssens TKS. Antimicrobial activity in culturable gut microbial communities of springtails. J Appl Microbiol 2018; 125:740-752. [PMID: 29723440 DOI: 10.1111/jam.13899] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 04/01/2018] [Accepted: 04/25/2018] [Indexed: 01/11/2023]
Abstract
AIMS The rise of antibiotic resistance pushes the pharmaceutical industry to continually search for substances with new structures and novel mechanisms of action. Many environmental niches are still to be explored as sources of antimicrobials. In this paper, we assess the antimicrobial potential of gut microbes of springtails, soil invertebrates which live in a microbe-dominated environment and are known to be tolerant to entomopathogenic micro-organisms. METHODS AND RESULTS Bacteria isolated from the guts of five springtail species were tested for inhibitory activity against different microbial pathogens. We identified 46 unique isolates belonging to 17 genera and 15 families. Thirty-five of these isolates (76%) showed inhibitory activity, and 18 inhibited both bacterial and fungal pathogens. One isolate was active against all the pathogens tested. CONCLUSIONS We demonstrated a range of antimicrobial activities in bacteria isolated from the guts of springtails, indicative of complex interactions within the gut community, possibly relating to nutrition or defence against pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY Our results suggest that a large proportion of cultivatable microbes associated with Collembola have a potential for antimicrobial production. We propose that soil invertebrates and their associated microbes are interesting targets for drug discovery.
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Affiliation(s)
- V Agamennone
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - D Roelofs
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - N M van Straalen
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - T K S Janssens
- Department of Ecological Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Microlife Solutions, Amsterdam, The Netherlands
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18
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Liese S, Netz RR. Quantitative Prediction of Multivalent Ligand-Receptor Binding Affinities for Influenza, Cholera, and Anthrax Inhibition. ACS Nano 2018; 12:4140-4147. [PMID: 29474056 DOI: 10.1021/acsnano.7b08479] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Multivalency achieves strong, yet reversible binding by the simultaneous formation of multiple weak bonds. It is a key interaction principle in biology and promising for the synthesis of high-affinity inhibitors of pathogens. We present a molecular model for the binding affinity of synthetic multivalent ligands onto multivalent receptors consisting of n receptor units arranged on a regular polygon. Ligands consist of a geometrically matching rigid polygonal core to which monovalent ligand units are attached via flexible linker polymers, closely mimicking existing experimental designs. The calculated binding affinities quantitatively agree with experimental studies for cholera toxin ( n = 5) and anthrax receptor ( n = 7) and allow to predict optimal core size and optimal linker length. Maximal binding affinity is achieved for a core that matches the receptor size and for linkers that have an equilibrium end-to-end distance that is slightly longer than the geometric separation between ligand core and receptor sites. Linkers that are longer than optimal are greatly preferable compared to shorter linkers. The angular steric restriction between ligand unit and linker polymer is shown to be a key parameter. We construct an enhancement diagram that quantifies the multivalent binding affinity compared to monovalent ligands. We conclude that multivalent ligands against influenza viral hemagglutinin ( n = 3), cholera toxin ( n = 5), and anthrax receptor ( n = 7) can outperform monovalent ligands only for a monovalent ligand affinity that exceeds a core-size dependent threshold value. Thus, multivalent drug design needs to balance core size, linker length, as well as monovalent ligand unit affinity.
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Affiliation(s)
- Susanne Liese
- Department of Physics , Freie Universität Berlin , 14195 Berlin , Germany
- Department of Mathematics , University of Oslo , 0851 Oslo , Norway
| | - Roland R Netz
- Department of Physics , Freie Universität Berlin , 14195 Berlin , Germany
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19
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Baskaran P, Udduttula A, Uthirapathy V. Development and characterisation of novel Ce‐doped hydroxyapatite–Fe 3 O 4 nanocomposites and their in vitro biological evaluations for biomedical applications. IET Nanobiotechnol 2017; 12:138-146. [PMCID: PMC8676436 DOI: 10.1049/iet-nbt.2017.0029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 09/04/2017] [Accepted: 09/12/2017] [Indexed: 07/29/2023] Open
Abstract
Hydroxyapatite (HAP: Ca10 (PO4)6 (OH)2) is extensively used in biomedical field because of its biocompatibility, osteoconductivity and non‐toxicity properties. However, HAP exhibits poor mechanical strength and bacterial restriction behavior. To overcome these drawbacks, various metal ions such as Ag+, Zn2+, Cu2+, Ti4+ and Ce4+/3+ are incorporated in HAP matrix to increase the mechanical and biological properties. Among these, Cerium (Ce) is selected as antibacterial agent due to its high thermal stability and its applications in dental fillings, bone healing and catheters. Fe3 O4 nanoparticles were used in hyperthermia treatment, magnetic fluid recordings and catalysis. In this present study, we have synthesized nanocomposites consisting of 1.25% Ce doped HAP with various concentrations of Fe3 O4 NPs as 90:10 (C‐1), 70:30 (C‐2) and 50:50 wt% (C‐3) using ball milling technique. The obtained Ce@HAP‐Fe3 O4 nanocomposites were characterized by ATR‐FTIR, XRD, VSM, SEM‐EDAX and TEM analysis. Further, the fabricated Ce@HAP‐Fe3 O4 nanocomposites were tested for its antibacterial activity towards Staphylococcus aureus (S. aureus) and Escherichia coli (E.coli), where C‐3 composites exhibit the excellent pathogen inhibition towards E.coli. In addition, the cytotoxicity evaluation on C‐3 nanocomposites by in vitro biocompatibility study using MG‐63 cells shows the prominent viable cell enhancement up to 400µg/mL concentrations.
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Affiliation(s)
- Priyadarshini Baskaran
- Department of ChemistrySchool of Advanced SciencesVIT UniversityVellore632 014Tamil NaduIndia
| | - Anjaneyulu Udduttula
- Department of ChemistrySchool of Advanced SciencesVIT UniversityVellore632 014Tamil NaduIndia
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20
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Oh E, McMullen LM, Chui L, Jeon B. Differential Survival of Hyper-Aerotolerant Campylobacter jejuni under Different Gas Conditions. Front Microbiol 2017; 8:954. [PMID: 28611753 PMCID: PMC5447730 DOI: 10.3389/fmicb.2017.00954] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 05/12/2017] [Indexed: 01/14/2023] Open
Abstract
Campylobacter jejuni accounts for a significant number of foodborne illnesses around the world. C. jejuni is microaerophilic and typically does not survive efficiently in oxygen-rich conditions. We recently reported that hyper-aerotolerant (HAT) C. jejuni are highly prevalent in retail poultry meat. To assess the capabilities of HAT C. jejuni in foodborne transmission and infection, in this study, we investigated the prevalence of virulence genes in HAT C. jejuni and the survival in poultry meat in atmosphere at a refrigeration temperature. When we examined the prevalence of eight virulence genes in 70 C. jejuni strains from raw poultry meat, interestingly, the frequencies of detecting virulence genes were significantly higher in HAT C. jejuni strains than aerosenstive C. jejuni strains. This suggests that HAT C. jejuni would potentially be more pathogenic than aerosensitive C. jejuni. Under aerobic conditions, aerosensitive C. jejuni survived at 4°C in raw poultry meat for 3 days, whereas HAT C. jejuni survived in poultry meat for a substantially extended time; there was a five-log CFU reduction over 2 weeks. In addition, we measured the effect of other gas conditions, including N2 and CO2, on the viability of HAT C. jejuni in comparison with aerosensitive and aerotolerant strains. N2 marginally affected the viability of C. jejuni. However, CO2 significantly reduced the viability of C. jejuni both in culture media and poultry meat. Based on the results, modified atmosphere packaging using CO2 may help us to control poultry contamination with HAT C. jejuni.
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Affiliation(s)
- Euna Oh
- School of Public Health, University of Alberta, EdmontonAB, Canada
| | - Lynn M McMullen
- Department of Agricultural, Food and Nutritional Science, University of Alberta, EdmontonAB, Canada
| | - Linda Chui
- Department of Laboratory Medicine and Pathology, University of Alberta, EdmontonAB, Canada.,Provincial Laboratory for Public Health, EdmontonAB, Canada
| | - Byeonghwa Jeon
- School of Public Health, University of Alberta, EdmontonAB, Canada
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21
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Muletz-Wolz CR, DiRenzo GV, Yarwood SA, Campbell Grant EH, Fleischer RC, Lips KR. Antifungal Bacteria on Woodland Salamander Skin Exhibit High Taxonomic Diversity and Geographic Variability. Appl Environ Microbiol 2017; 83:e00186-17. [PMID: 28213545 DOI: 10.1128/AEM.00186-17] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 02/10/2017] [Indexed: 12/31/2022] Open
Abstract
Diverse bacteria inhabit amphibian skin; some of those bacteria inhibit growth of the fungal pathogen Batrachochytrium dendrobatidis Yet there has been no systematic survey of anti-B. dendrobatidis bacteria across localities, species, and elevations. This is important given geographic and taxonomic variations in amphibian susceptibility to B. dendrobatidis Our collection sites were at locations within the Appalachian Mountains where previous sampling had indicated low B. dendrobatidis prevalence. We determined the numbers and identities of anti-B. dendrobatidis bacteria on 61 Plethodon salamanders (37 P. cinereus, 15 P. glutinosus, 9 P. cylindraceus) via culturing methods and 16S rRNA gene sequencing. We sampled co-occurring species at three localities and sampled P. cinereus along an elevational gradient (700 to 1,000 meters above sea level [masl]) at one locality. We identified 50 anti-B. dendrobatidis bacterial operational taxonomic units (OTUs) and found that the degree of B. dendrobatidis inhibition was not correlated with relatedness. Five anti-B. dendrobatidis bacterial strains occurred on multiple amphibian species at multiple localities, but none were shared among all species and localities. The prevalence of anti-B. dendrobatidis bacteria was higher at Shenandoah National Park (NP), VA, with 96% (25/26) of salamanders hosting at least one anti-B. dendrobatidis bacterial species compared to 50% (7/14) at Catoctin Mountain Park (MP), MD, and 38% (8/21) at Mt. Rogers National Recreation Area (NRA), VA. At the individual level, salamanders at Shenandoah NP had more anti-B. dendrobatidis bacteria per individual (μ = 3.3) than those at Catoctin MP (μ = 0.8) and at Mt. Rogers NRA (μ = 0.4). All salamanders tested negative for B. dendrobatidis Anti-B. dendrobatidis bacterial species are diverse in central Appalachian Plethodon salamanders, and their distribution varied geographically. The antifungal bacterial species that we identified may play a protective role for these salamanders.IMPORTANCE Amphibians harbor skin bacteria that can kill an amphibian fungal pathogen, Batrachochytrium dendrobatidis Some amphibians die from B. dendrobatidis infection, whereas others do not. The bacteria that can kill B. dendrobatidis, called anti-B. dendrobatidis bacteria, are thought to influence the B. dendrobatidis infection outcome for the amphibian. Yet how anti-B. dendrobatidis bacterial species vary among amphibian species and populations is unknown. We determined the distribution of anti-B. dendrobatidis bacterial species among three salamander species (n = 61) sampled at three localities. We identified 50 unique anti-B. dendrobatidis bacterial species and found that all of the tested salamanders were negative for B. dendrobatidis Five anti-B. dendrobatidis bacterial species were commonly detected, suggesting a stable, functional association with these salamanders. The number of anti-B. dendrobatidis bacteria per individual varied among localities but not among co-occurring salamander species, demonstrating that environment is more influential than host factors in structuring the anti-B. dendrobatidis bacterial community. These anti-B. dendrobatidis bacteria may serve a protective function for their salamander hosts.
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22
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Smith IM, Baker A, Arneborg N, Jespersen L. Non-Saccharomyces yeasts protect against epithelial cell barrier disruption induced by Salmonella enterica subsp. enterica serovar Typhimurium. Lett Appl Microbiol 2015; 61:491-7. [PMID: 26280244 DOI: 10.1111/lam.12481] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 08/07/2015] [Accepted: 08/08/2015] [Indexed: 12/26/2022]
Abstract
UNLABELLED The human gastrointestinal epithelium makes up the largest barrier separating the body from the external environment. Whereas invasive pathogens cause epithelial barrier disruption, probiotic micro-organisms modulate tight junction regulation and improve epithelial barrier function. In addition, probiotic strains may be able to reduce epithelial barrier disruption caused by pathogenic species. The aim of this study was to explore non-Saccharomyces yeast modulation of epithelial cell barrier function in vitro. Benchmarking against established probiotic strains, we evaluated the ability of four nonpathogenic yeast species to modulate transepithelial electrical resistance (TER) across a monolayer of differentiated human colonocytes (Caco-2 cells). Further, we assessed yeast modulation of a Salmonella Typhimurium-induced epithelial cell barrier function insult. Our findings demonstrate distinct patterns of non-Saccharomyces yeast modulation of epithelial cell barrier function. While the established probiotic yeast Saccharomyces boulardii increased TER across a Caco-2 monolayer by 30%, Kluyveromyces marxianus exhibited significantly stronger properties of TER enhancement (50% TER increase). In addition, our data demonstrate significant yeast-mediated modulation of Salmonella-induced epithelial cell barrier disruption and identify K. marxianus and Metschnikowia gruessii as two non-Saccharomyces yeasts capable of protecting human epithelial cells from pathogen invasion. SIGNIFICANCE AND IMPACT OF THE STUDY This study demonstrates distinct patterns of non-Saccharomyces yeast modulation of epithelial cell barrier function in vitro. Further, our data demonstrate significant yeast-mediated modulation of Salmonella Typhimurium-induced epithelial cell barrier disruption and identify Kluyveromyces marxianus and Metschnikowia gruessii as two non-Saccharomyces yeasts capable of protecting human epithelial cells from pathogen invasion. This study is the first to demonstrate significant non-Saccharomyces yeast-mediated epithelial cell barrier protection from Salmonella invasion, thus encouraging future efforts aimed at confirming the observed effects in vivo and driving further strain development towards novel yeast probiotics.
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Affiliation(s)
- I M Smith
- Health & Nutrition Discovery, Chr. Hansen, Hørsholm, Denmark.,Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - A Baker
- Health & Nutrition Discovery, Chr. Hansen, Hørsholm, Denmark
| | - N Arneborg
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - L Jespersen
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
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Martínez-Rodríguez JDC, De la Mora-Amutio M, Plascencia-Correa LA, Audelo-Regalado E, Guardado FR, Hernández-Sánchez E, Peña-Ramírez YJ, Escalante A, Beltrán-García MJ, Ogura T. Cultivable endophytic bacteria from leaf bases of Agave tequilana and their role as plant growth promoters. Braz J Microbiol 2015; 45:1333-9. [PMID: 25763038 PMCID: PMC4323307 DOI: 10.1590/s1517-83822014000400025] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 04/17/2014] [Indexed: 12/02/2022] Open
Abstract
Agave tequilana Weber var. ‘Azul’ is grown for the production of tequila, inulin and syrup. Diverse bacteria inhabit plant tissues and play a crucial role for plant health and growth. In this study culturable endophytic bacteria were extracted from leaf bases of 100 healthy Agave tequilana plants. In plant tissue bacteria occurred at mean population densities of 3 million CFU/g of fresh plant tissue. Three hundred endophytic strains were isolated and 16s rDNA sequences grouped the bacteria into eight different taxa that shared high homology with other known sequences. Bacterial endophytes were identified as Acinectobacter sp., A. baumanii, A. bereziniae, Cronobacter sakazakii, Enterobacter hormaechei, Bacillus sp. Klebsiella oxytoca, Pseudomonas sp., Enterococcus casseliflavus, Leuconostoc mesenteroides subsp. mesenteroides and Gluconobacter oxydans. Isolates were confirmed to be plant growth promoting bacteria (PGPB) by their capacities for nitrogen fixation, auxin production, phosphate solubilization, or antagonism against Fusarium oxysporum AC132. E. casseliflavus JM47 and K. oxytoca JM26 secreted the highest concentrations of IAA. The endophyte Acinectobacter sp. JM58 exhibited the maximum values for nitrogen fixation and phosphate solubilization index (PSI). Inhibition of fungi was found in Pseudomonas sp. JM9p and K. oxytoca JM26. Bacterial endophytes show promise for use as bio-inoculants for agave cultivation. Use of endophytes to enhance cultivation of agave may be particularly important for plants produced by micropropagation techniques, where native endophytes may have been lost.
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Affiliation(s)
- Julia del C Martínez-Rodríguez
- Instituto de Ingeniería Universidad Autónoma de Baja California Campus MexicaliMexicali México Instituto de Ingeniería, Universidad Autónoma de Baja California, Campus Mexicali, Mexicali, México
| | - Marcela De la Mora-Amutio
- Instituto de Ingeniería Universidad Autónoma de Baja California Campus MexicaliMexicali México Instituto de Ingeniería, Universidad Autónoma de Baja California, Campus Mexicali, Mexicali, México
| | - Luis A Plascencia-Correa
- Departamento de Química Instituto de Ciencias Exactas y Terrestres Universidad Autónoma de Guadalajara Jalisco México Departamento de Química, Instituto de Ciencias Exactas y Terrestres, Universidad Autónoma de Guadalajara, Jalisco, México
| | - Esmeralda Audelo-Regalado
- Departamento de Química Instituto de Ciencias Exactas y Terrestres Universidad Autónoma de Guadalajara Jalisco México Departamento de Química, Instituto de Ciencias Exactas y Terrestres, Universidad Autónoma de Guadalajara, Jalisco, México
| | - Francisco R Guardado
- Departamento de Química Instituto de Ciencias Exactas y Terrestres Universidad Autónoma de Guadalajara Jalisco México Departamento de Química, Instituto de Ciencias Exactas y Terrestres, Universidad Autónoma de Guadalajara, Jalisco, México
| | - Elías Hernández-Sánchez
- Colegio de Postgraduados Carretera México-Texcoco Texcoco México Colegio de Postgraduados Carretera México-Texcoco, Texcoco, México
| | - Yuri J Peña-Ramírez
- El Colegio de la Frontera Sur A.C. Unidad Campeche LermaCampeche México El Colegio de la Frontera Sur A.C. Unidad Campeche, Lerma, Campeche, México
| | - Adelfo Escalante
- Departamento de Ingeniería Celular y Biocatálisis Instituto de Biotecnología Universidad Nacional Autónoma de México CuernavacaMorelos México Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México
| | - Miguel J Beltrán-García
- Departamento de Química Instituto de Ciencias Exactas y Terrestres Universidad Autónoma de Guadalajara Jalisco México Departamento de Química, Instituto de Ciencias Exactas y Terrestres, Universidad Autónoma de Guadalajara, Jalisco, México
| | - Tetsuya Ogura
- Departamento de Química Instituto de Ciencias Exactas y Terrestres Universidad Autónoma de Guadalajara Jalisco México Departamento de Química, Instituto de Ciencias Exactas y Terrestres, Universidad Autónoma de Guadalajara, Jalisco, México
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Cruz-Guerrero A, Hernández-Sánchez H, Rodríguez-Serrano G, Gómez-Ruiz L, García-Garibay M, Figueroa-González I. Commercial probiotic bacteria and prebiotic carbohydrates: a fundamental study on prebiotics uptake, antimicrobials production and inhibition of pathogens. J Sci Food Agric 2014; 94:2246-2252. [PMID: 24374769 DOI: 10.1002/jsfa.6549] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/11/2013] [Accepted: 12/24/2013] [Indexed: 06/03/2023]
Abstract
BACKGROUND Probiotics and prebiotics are among the most important functional food ingredients worldwide. The proven benefits of such ingredients to human health have encouraged the development of functional foods containing both probiotics and prebiotics. In this work, the production of antimicrobial compounds coupled to the uptake of commercial prebiotics by probiotic bacteria was investigated. RESULTS The probiotic bacteria studied were able to take up commercial prebiotic carbohydrates to the same or higher extent than that observed for lactose (control carbohydrate). The growth of probiotic bacteria was coupled to the production of antimicrobials such as short-chain fatty acids (SCFA), H2 O2 and bacteriocins. A higher production of antimicrobial compounds was recorded with Oligomate 55® compared with Regulact® and Frutafit® (3-5 and 10-115 times higher SCFA and H2 O2 production, respectively). The probiotic bacteria grown with Oligomate 55® also produced bacteriocins and other non-identified antimicrobial compounds. The antimicrobials produced by the probiotic bacteria inhibited up to 50% the growth of model pathogens such as Escherichia coli, Listeria innocua and Micrococcus luteus compared with control cultures. CONCLUSIONS The results here obtained are useful for the adequate selection of probiotic/prebiotics pairs and therefore in the development of efficient functional foods.
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Affiliation(s)
- Alma Cruz-Guerrero
- Departamento de Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, 09340, México, DF, Mexico
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Diaz MA, Bik EM, Carlin KP, Venn-Watson SK, Jensen ED, Jones SE, Gaston EP, Relman DA, Versalovic J. Identification of Lactobacillus strains with probiotic features from the bottlenose dolphin (Tursiops truncatus). J Appl Microbiol 2013; 115:1037-51. [PMID: 23855505 PMCID: PMC4063339 DOI: 10.1111/jam.12305] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 06/30/2013] [Accepted: 07/06/2013] [Indexed: 01/09/2023]
Abstract
Aims In order to develop complementary health management strategies for marine mammals, we used culture-based and culture-independent approaches to identify gastrointestinal lactobacilli of the common bottlenose dolphin, Tursiops truncatus. Methods and Results We screened 307 bacterial isolates from oral and rectal swabs, milk and gastric fluid, collected from 38 dolphins in the U.S. Navy Marine Mammal Program, for potentially beneficial features. We focused our search on lactobacilli and evaluated their ability to modulate TNF secretion by host cells and inhibit growth of pathogens. We recovered Lactobacillus salivarius strains which secreted factors that stimulated TNF production by human monocytoid cells. These Lact. salivarius isolates inhibited growth of selected marine mammal and human bacterial pathogens. In addition, we identified a novel Lactobacillus species by culture and direct sequencing with 96·3% 16S rDNA sequence similarity to Lactobacillus ceti. Conclusions Dolphin-derived Lact. salivarius isolates possess features making them candidate probiotics for clinical studies in marine mammals. Significance and Impact of the Study This is the first study to isolate lactobacilli from dolphins, including a novel Lactobacillus species and a new strain of Lact. salivarius, with potential for veterinary probiotic applications. The isolation and identification of novel Lactobacillus spp. and other indigenous microbes from bottlenose dolphins will enable the study of the biology of symbiotic members of the dolphin microbiota and facilitate the understanding of the microbiomes of these unique animals.
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Affiliation(s)
- M A Diaz
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, USA; Department of Pathology, Texas Children's Hospital, Houston, TX, USA
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