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Treven P, Paveljšek D, Kostanjšek R, Golob M, Bogovič Matijašič B, Mohar Lorbeg P. In vitro model of human mammary gland microbial colonization (MAGIC) demonstrates distinctive cytokine response to imbalanced human milk microbiota. Microbiol Spectr 2024; 12:e0236923. [PMID: 38289112 PMCID: PMC10913382 DOI: 10.1128/spectrum.02369-23] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 12/19/2023] [Indexed: 03/06/2024] Open
Abstract
Despite the established concept of the human mammary gland (MG) as a habitat with its own microbiota, the exact mechanism of MG colonization is still elusive and a well-characterized in vitro model would reinforce studies of the MG microbiota development. We aimed to establish and characterize an in vitro cell model for studying MAmmary Gland mIcrobial Colonization (MAGIC) model. We used the immortalized cell line MCF10A, which expresses the strong polarized phenotype similar to MG ductal epithelium when cultured on a permeable support (Transwell). We analyzed the surface properties of the MAGIC model by gene expression analysis of E-cadherin, tight junction proteins, and mucins and by scanning electron microscopy. To demonstrate the applicability of the model, we tested the adhesion capability of the whole human milk (HM) microbial community and the cellular response of the model when challenged directly with raw HM samples. MCF10A on permeable supports differentiated and formed a tight barrier, by upregulation of CLDN8, MUC1, MUC4, and MUC20 genes. The surface of the model was covered with mucins and morphologically diverse with at least two cell types and two types of microvilli. Cells in the MAGIC model withstood the challenge with heat-treated HM samples and responded differently to the imbalanced HM microbiota by distinctive cytokine response. The microbial profile of the bacteria adhered on the MAGIC model reflected the microbiological profile of the input HM samples. The well-studied MAGIC model could be useful for studies of bacterial attachment to the MG and for in vitro studies of biofilm formation and microbiota development.IMPORTANCEThe MAGIC model may be particularly useful for studies of bacterial attachment to the surface of the mammary ducts and for in vitro studies of biofilm formation and the development of the human mammary gland (MG) microbiota. The model is also useful for immunological studies of the interaction between bacteria and MG cells. We obtained pioneering information on which of the bacteria present in the raw human milk (HM) were able to attach to the epithelium treated directly with raw HM, as well as on the effects of bacteria on the MG epithelial cells. The MAGIC cell model also offers new opportunities for research in other areas of MG physiology, such as the effects of bioactive milk components on microbial colonization of the MG, mastitis prevention, and studies of probiotic development. Since resident MG bacteria may be an important factor in breast cancer development, the MAGIC in vitro tool also offers new opportunities for cancer research.
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Affiliation(s)
- Primož Treven
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Diana Paveljšek
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Rok Kostanjšek
- Department of Biology, University of Ljubljana, Biotechnical Faculty, Chair of Zoology, Ljubljana, Slovenia
| | - Majda Golob
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Ljubljana, Slovenia
| | - Bojana Bogovič Matijašič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Petra Mohar Lorbeg
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Institute of Dairy Science and Probiotics, Domžale, Slovenia
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Simonič M, Slapničar Š, Trček J, Matijašić BB, Lorbeg PM, Vesel A, Zemljič LF, Peršin Fratnik Z. Probiotic Lactobacillus paragasseri K7 Nanofiber Encapsulation Using Nozzle-Free Electrospinning. Appl Biochem Biotechnol 2023; 195:6768-6789. [PMID: 36920716 DOI: 10.1007/s12010-023-04416-x] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/17/2023] [Indexed: 03/16/2023]
Abstract
Probiotics are live microorganisms that can have beneficial effects on humans. Encapsulation offers them a better chance of survival. Therefore, nozzle-free electrospinning was introduced for their embedding in nanofibrous material. Probiotic Lactobacillus paragasseri K7 in lyophilized and fresh form, with and without inulin as prebiotic, was added to a polymer solution of sodium alginate (NaAlg) and polyethylene oxide (PEO). Conductivity, viscosity, pH, and surface tension were determined to define the optimal concentration and volume ratio for smooth electrospinning. The success of the formed nanoscale materials was examined by scanning electron microscope (SEM), while the entrapment of probiotics in the nanofibrous mats was detected by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). Spontaneous diffusion of bacteria from electrospun samples in PBS buffer pH 7.4 was studied by plate counting on MRS agar. By exposing polymer solutions containing L. paragasseri K7 and inulin to a high electric field, the nanofilm was formed on a polypropylene substrate, used as collecting material. When polymer solutions without inulin were used, the bead-like nanofibers may have become visible. The SEM results suggest that inulin, in addition to K7 strain, additionally lowers the conductivity of spinning macromolecular solution and hinders the nanofiber formation. The results of ATR-FTIR confirmed the presence of L. paragasseri K7 embedded in nanocomposites by the appearance of characteristic peaks. The samples containing the probiotic regardless of its form with inulin had similar surface composition, except that the sodium content was higher in the samples with fresh probiotic, probably due to greater and thus less easy embedding of the bacteria in NaAlg. Within 2 h, the largest amount of probiotic strain K7 was spontaneously released from the electrospun sample containing the inulin and probiotic in freeze-dried form (44%), while the amount released from the nanofibrous sample, which also contained the inulin and probiotic in fresh form, was significantly lower (21%). These preliminary results demonstrate the potential of nozzle-free electrospinning technology for the development of probiotic delivery systems for short-term use, such as feminine hygiene materials (tampons, pads, napkins).
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Affiliation(s)
- Marjana Simonič
- Laboratory of Water Physics and Membrane Processes, Faculty of Chemistry and Chemical Engineering, University of Maribor, 20000, Maribor, Slovenia
| | - Špela Slapničar
- Department of Inorganic Chemistry and Technology, National Institute of Chemistry, 1000, Ljubljana, Slovenia
| | - Janja Trček
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, 2000, Maribor, Slovenia
| | - Bojana Bogovič Matijašić
- Department of Animal Science, Institute of Dairy Science and Probiotics, Biotechnical Faculty, University of Ljubljana, 1230, Domžale, Slovenia
| | - Petra Mohar Lorbeg
- Department of Animal Science, Institute of Dairy Science and Probiotics, Biotechnical Faculty, University of Ljubljana, 1230, Domžale, Slovenia
| | - Alenka Vesel
- Surface Engineering and Optoelectronics, Institut "Jožef Stefan", 1000, Ljubljana, Slovenia
| | - Lidija Fras Zemljič
- Laboratory for Characterization and Processing of Polymers, Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, 2000, Maribor, Slovenia
| | - Zdenka Peršin Fratnik
- Laboratory for Characterization and Processing of Polymers, Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, 2000, Maribor, Slovenia.
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Đorđević J, Ledina T, Golob M, Mohar Lorbeg P, Čanžek Majhenič A, Bogovič Matijašić B, Bulajić S. Safety evaluation of enterococci isolated from raw milk and artisanal cheeses made in Slovenia and Serbia. FOOD SCI TECHNOL INT 2023; 29:765-775. [PMID: 35912485 DOI: 10.1177/10820132221117870] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Enterococci represent a significant part of the non-starter LAB microbiota of artisanal cheeses produced mainly from raw milk. Common approaches to safety evaluation of enterococci isolates include assessment of antimicrobial resistance and virulence potential. Hence, a collection of 47 (n = 22, Serbia; n = 25, Slovenia) dairy enterococcal isolates, of which E. faecalis (n = 28), E. faecium (n = 11), E. durans (n = 5), E. casseliflavus (n = 2), and E. gallinarum (n = 1), was analyzed. The susceptibility to 12 antimicrobials was tested using a broth microdilution method, and the presence of the selected antimicrobial resistance and virulence genes was investigated using PCR. Isolates were resistant to tetracycline (TET) (25.5%), erythromycin (ERY) (17.0%), gentamycin and chloramphenicol (CHL) (∼6%). No resistance to ampicillin (AMP), ciprofloxacin (CIP), daptomycin (DAP), linezolid (LZD), teicoplanin (TEI), tigecycline (TGC) and vancomycin (VAN) was detected. Among all the resistance determinants analyzed, ermB gene was detected most frequently. All 10 virulence genes analyzed were detected with a distribution of cpd (72.3%), cob and ccf (70.2%), gelE (68.1%), hyl (59.6%), agg (53.2%) and esp (46.8%). The genes encoding cytolysin (cylA, cylM and cylB) were amplified to a lesser extent (21.3%, 21.3% and 12.8%, respectively). However, due to the limited number of enterococci isolates analyzed in the present study, further studies are still required in order to better document the safety status of dairy enterococci.
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Affiliation(s)
- Jasna Đorđević
- Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Tijana Ledina
- Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
| | - Majda Golob
- Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Petra Mohar Lorbeg
- Biotechnical Faculty, Institute of Dairy Science and Probiotics, Ljubljana, Slovenia
| | | | | | - Snežana Bulajić
- Faculty of Veterinary Medicine, University of Belgrade, Belgrade, Serbia
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Rozman V, Mohar Lorbeg P, Treven P, Accetto T, Janežič S, Rupnik M, Bogovič Matijašić B. Genomic insights into antibiotic resistance and mobilome of lactic acid bacteria and bifidobacteria. Life Sci Alliance 2023; 6:e202201637. [PMID: 36781180 PMCID: PMC9930590 DOI: 10.26508/lsa.202201637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 01/30/2023] [Accepted: 01/30/2023] [Indexed: 02/15/2023] Open
Abstract
Lactic acid bacteria (LAB) and Bifidobacterium sp. (bifidobacteria) can carry antimicrobial resistance genes (ARGs), yet data on resistance mechanisms in these bacteria are limited. The aim of our study was to identify the underlying genetic mechanisms of phenotypic resistance in 103 LAB and bifidobacteria using whole-genome sequencing. Sequencing data not only confirmed the presence of 36 acquired ARGs in genomes of 18 strains, but also revealed wide dissemination of intrinsic ARGs. The presence of acquired ARGs on known and novel mobile genetic elements raises the possibility of their horizontal spread. In addition, our data suggest that mutations may be a common mechanism of resistance. Several novel candidate resistance mechanisms were uncovered, providing a basis for further in vitro studies. Overall, 1,314 minimum inhibitory concentrations matched with genotypes in 92.4% of the cases; however, prediction of phenotype based on genotypic data was only partially efficient, especially with respect to aminoglycosides and chloramphenicol. Our study sheds light on resistance mechanisms and their transferability potential in LAB and bifidobacteria, which will be useful for risk assessment analysis.
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Affiliation(s)
- Vita Rozman
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Petra Mohar Lorbeg
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Primož Treven
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Tomaž Accetto
- University of Ljubljana, Biotechnical Faculty, Department of Microbiology, Chair of Microbial Diversity, Microbiomics and Biotechnology, Ljubljana, Slovenia
| | - Sandra Janežič
- National Laboratory of Health, Environment and Food, Maribor, Slovenia
- University of Maribor, Faculty of Medicine, Maribor, Slovenia
| | - Maja Rupnik
- National Laboratory of Health, Environment and Food, Maribor, Slovenia
- University of Maribor, Faculty of Medicine, Maribor, Slovenia
| | - Bojana Bogovič Matijašić
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
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Kunej T, Horvat S, Salobir J, Stres B, Mikec Š, Accetto T, Avguštin G, Matijašić BB, Cividini A, Majhenič AČ, Čepon M, Deutsch L, Djurdjevič I, Erjavec E, Gorjanc G, Holcman A, Jordan D, Juvančič L, Kavčič S, Kermauner A, Klopčič M, Kocjančič T, Kovač M, Kuhar A, Lavrenčič A, Leskovec J, Levart A, Malovrh Š, Marinšek-Logar R, Lorbeg PM, Narat M, Obermajer T, Paveljšek D, Pirman T, Potočnik K, Rac I, Rezar V, Rogelj I, Simčič M, Snoj A, Bajec SS, Šumrada T, Terčič D, Treven P, Vodovnik M, Šemrov MZ, Žgajnar J, Žgur S, Dovč P. How Can We Advance Integrative Biology Research in Animal Science in 21st Century? Experience at University of Ljubljana from 2002 to 2022. OMICS 2022; 26:586-588. [PMID: 36315198 PMCID: PMC9700370 DOI: 10.1089/omi.2022.0133] [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] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
In this perspective analysis, we strive to answer the following question: how can we advance integrative biology research in the 21st century with lessons from animal science? At the University of Ljubljana, Biotechnical Faculty, Department of Animal Science, we share here our three lessons learned in the two decades from 2002 to 2022 that we believe could inform integrative biology, systems science, and animal science scholarship in other countries and geographies. Cultivating multiomics knowledge through a conceptual lens of integrative biology is crucial for life sciences research that can stand the test of diverse biological, clinical, and ecological contexts. Moreover, in an era of the current COVID-19 pandemic, animal nutrition and animal science, and the study of their interactions with human health (and vice versa) through integrative biology approaches hold enormous prospects and significance for systems medicine and ecosystem health.
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Affiliation(s)
- Tanja Kunej
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Simon Horvat
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Janez Salobir
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Blaž Stres
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Špela Mikec
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Tomaž Accetto
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- Department of Microbiology, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Gorazd Avguštin
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- Department of Microbiology, University of Ljubljana, Biotechnical Faculty, Slovenia
| | | | - Angela Cividini
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | | | - Marko Čepon
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Leon Deutsch
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- Department of Microbiology, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Ida Djurdjevič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Emil Erjavec
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Gregor Gorjanc
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, United Kingdom
| | - Antonija Holcman
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Dušanka Jordan
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Luka Juvančič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Stane Kavčič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Ajda Kermauner
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Marija Klopčič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Tina Kocjančič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Milena Kovač
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Aleš Kuhar
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Andrej Lavrenčič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Jakob Leskovec
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Alenka Levart
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Špela Malovrh
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Romana Marinšek-Logar
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- Department of Microbiology, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Petra Mohar Lorbeg
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Mojca Narat
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Tanja Obermajer
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Diana Paveljšek
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Tatjana Pirman
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Klemen Potočnik
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Ilona Rac
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Vida Rezar
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Irena Rogelj
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Mojca Simčič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Aleš Snoj
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Simona Sušnik Bajec
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Tanja Šumrada
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Dušan Terčič
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Primož Treven
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Maša Vodovnik
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
- Department of Microbiology, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Manja Zupan Šemrov
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Jaka Žgajnar
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Silvester Žgur
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
| | - Peter Dovč
- Department of Animal Science, University of Ljubljana, Biotechnical Faculty, Slovenia
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Rozman V, Mohar Lorbeg P, Treven P, Accetto T, Golob M, Zdovc I, Bogovič Matijašić B. Lactic acid bacteria and bifidobacteria deliberately introduced into the agro-food chain do not significantly increase the antimicrobial resistance gene pool. Gut Microbes 2022; 14:2127438. [PMID: 36170451 PMCID: PMC9542798 DOI: 10.1080/19490976.2022.2127438] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Lactic acid bacteria (LAB) and bifidobacteria may serve as reservoirs of antimicrobial resistance, but the risk posed by strains intentionally introduced into the agro-food chain has not yet been thoroughly investigated. The aim of our study was to evaluate whether probiotics, starter and protective cultures, and feed additives represent a risk to human health. In addition to commercial strains of LAB and bifidobacteria, isolates from human milk or colostrum, intestinal mucosa or feces, and fermented products were analyzed. Phenotypic susceptibility data of 474 strains showed that antimicrobial resistance was more common in intestinal isolates than in commercial strains. Antimicrobial resistance genes (ARGs) and mobile genetic elements (MGEs) were characterized in the whole genome sequences of 1114 strains using comparative genomics. Intrinsic ARGs were abundant in enterococci, bifidobacteria, and lactococci but were considered non-risky due to the absence of MGEs. The results revealed that 13.8% of commercial strains contained acquired ARGs, most frequently for tetracycline. We associated 75.5% of the acquired ARGs with known or novel MGEs, and their potential for transmission was assessed by examining metagenomic sequences. We confirmed that ARGs and MGEs were not as abundant or diverse in commercial strains as in human intestinal isolates or isolates from human milk, suggesting that strains intentionally introduced into the agro-food chain do not pose a significant threat. However, attention should be paid especially to individual probiotic strains containing elements that have been shown to have high potential for transferability in the gut microbiota.Abbreviations: ARG, antimicrobial resistance gene; ICE, integrative and conjugative element; IME, integrative and mobilizable element; LAB, lactic acid bacteria; MDR, multidrug resistance; MIC, minimum inhibitory concentration; MGE, mobile genetic element; TRRPP, tetracycline-resistant ribosomal protection protein; WGS, whole genome sequences.
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Affiliation(s)
- Vita Rozman
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia,CONTACT Vita Rozman University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Petra Mohar Lorbeg
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Primož Treven
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
| | - Tomaž Accetto
- University of Ljubljana, Biotechnical Faculty, Department of Microbiology, Chair of Microbial Diversity, Microbiomics and Biotechnology, Ljubljana, Slovenia
| | - Majda Golob
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Ljubljana, Slovenia
| | - Irena Zdovc
- University of Ljubljana, Veterinary Faculty, Institute of Microbiology and Parasitology, Ljubljana, Slovenia
| | - Bojana Bogovič Matijašić
- University of Ljubljana, Biotechnical Faculty, Department of Animal Science, Institute of Dairy Science and Probiotics, Domžale, Slovenia
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Mohar Lorbeg P, Golob M, Kramer M, Treven P, Bogovič Matijašić B. Evaluation of Dietary Supplements Containing Viable Bacteria by Cultivation/MALDI-TOF Mass Spectrometry and PCR Identification. Front Microbiol 2021; 12:700138. [PMID: 34349743 PMCID: PMC8326757 DOI: 10.3389/fmicb.2021.700138] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 06/10/2021] [Indexed: 11/30/2022] Open
Abstract
The insufficient quality of products containing beneficial live bacteria in terms of content and viability of labelled microorganisms is an often-reported problem. The aim of this work was to evaluate the quality of dietary supplements containing viable bacteria available in Slovenian pharmacies using plate counting, matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI-TOF MS) and species- or subspecies-specific PCR with DNA isolated from consortia of viable bacteria, from individual isolates, or directly from the products. Twelve percent of the products (3 of 26) contained insufficient numbers of viable bacteria. Eighty-three of the labelled species (111 in total) were confirmed by PCR with DNA from the product; 74% of these were confirmed by PCR with DNA from viable consortium, and 65% of these were confirmed by MALDI-TOF MS analysis of colonies. Certain species in multi-strain products were confirmed by PCR with DNA from viable consortia but not by MALDI-TOF MS, suggesting that the number of isolates examined (three per labelled strain) was too low. With the exception of Lacticaseibacillus casei and closely related species (Lacticaseibacillus rhamnosus and Lacticaseibacillus zeae), PCR and MALDI-TOF identification results agreed for 99% of the isolates examined, although several MALDI-TOF results had lower score values (1.700-1.999), indicating that the species identification was not reliable. The species L. zeae, which appeared in 20 matches of the Biotyper analysis, was identified as L. rhamnosus by PCR. The MALDI-TOF MS analysis was also unsuccessful in detecting Lactobacillus acidophilus La-5 and Bacillus coagulans due to missing peaks and unreliable identification, respectively. Mislabelling was detected by both methods for two putative L. casei strains that turned out to belong to the species Lacticaseibacillus paracasei. PCR remains more successful in subspecies-level identification as long as the database of MALDI-TOF MS spectra is not expanded by building in-house databases. The lack of positive PCR results with viable consortia or colonies, but positive PCR results with DNA isolated directly from the products observed in 10% (11/112) of the labelled strains, suggests the presence of non-culturable bacteria in the products. MALDI-TOF MS is a faster and simpler alternative to PCR identification, provided that a sufficient number of colonies are examined. Generation of in-house library may further improve the identification accuracy at the species and sub-species level.
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Affiliation(s)
- Petra Mohar Lorbeg
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Majda Golob
- Veterinary Faculty, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Mateja Kramer
- Global Drug Development, Technical Research & Development, Biologics and Cell & Gene Therapy, Novartis, Global Project Management Office, Lek Pharmaceuticals d.d., Mengeš, Slovenia
| | - Primož Treven
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Bojana Bogovič Matijašić
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
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Treven P, Mahnič A, Rupnik M, Golob M, Pirš T, Matijašić BB, Lorbeg PM. Corrigendum: Evaluation of Human Milk Microbiota by 16S rRNA Gene Next-Generation Sequencing (NGS) and Cultivation/MALDI-TOF Mass Spectrometry Identification. Front Microbiol 2020; 11:31. [PMID: 32082280 PMCID: PMC7000922 DOI: 10.3389/fmicb.2020.00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 01/09/2020] [Indexed: 11/26/2022] Open
Affiliation(s)
- Primož Treven
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Aleksander Mahnič
- National Laboratory of Health, Environment and Food, Maribor, Slovenia
| | - Maja Rupnik
- National Laboratory of Health, Environment and Food, Maribor, Slovenia.,Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Majda Golob
- Faculty of Veterinary Medicine, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Tina Pirš
- Faculty of Veterinary Medicine, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Bojana Bogovič Matijašić
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Petra Mohar Lorbeg
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
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Rozman V, Mohar Lorbeg P, Accetto T, Bogovič Matijašić B. Characterization of antimicrobial resistance in lactobacilli and bifidobacteria used as probiotics or starter cultures based on integration of phenotypic and in silico data. Int J Food Microbiol 2020; 314:108388. [DOI: 10.1016/j.ijfoodmicro.2019.108388] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 10/02/2019] [Accepted: 10/11/2019] [Indexed: 12/16/2022]
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Treven P, Mahnič A, Rupnik M, Golob M, Pirš T, Matijašić BB, Lorbeg PM. Evaluation of Human Milk Microbiota by 16S rRNA Gene Next-Generation Sequencing (NGS) and Cultivation/MALDI-TOF Mass Spectrometry Identification. Front Microbiol 2019; 10:2612. [PMID: 31803156 PMCID: PMC6872673 DOI: 10.3389/fmicb.2019.02612] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 08/02/2019] [Accepted: 10/28/2019] [Indexed: 12/21/2022] Open
Abstract
The aim of the present study was to characterize human milk microbiota (HMM) with 16S rRNA gene amplicon next-generation sequencing and cultivation/matrix-assisted laser desorption/ionization (MALDI)-time of flight (TOF) mass spectrometry (MS) identification approaches. We analyzed 31 human milk samples from healthy Slovenian mothers. To check the accuracy of MALDI-TOF MS identification, several colonies representing most abundant genera and those, which could not be reliably identified by MALDI-TOF, were subjected to Sanger sequencing of their 16S rRNA gene. We showed that cultivation/MALDI-TOF MS was a suitable tool for culture-dependent determination of HMM. With both approaches, Staphylococcus and Streptococcus were found as predominant genera in HMM and the abundance of Staphylococcus was associated with decreased microbial diversity. In addition, we characterized factors that might influence HMM. The use of a breast pump was significantly associated with composition of HMM, lower microbial load, and higher abundance of cultivable staphylococci. Moreover, our study suggests that administration of probiotics to the suckling infant might influence HMM by increased abundance of lactobacilli and the presence of viable probiotic bacteria in human milk. However, since our study was observational with relatively small sample size, more targeted studies are needed to study possible transfer of probiotics to the mammary gland via an external route and the physiological relevance of these events.
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Affiliation(s)
- Primož Treven
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Aleksander Mahnič
- National Laboratory of Health, Environment and Food, Maribor, Slovenia
| | - Maja Rupnik
- National Laboratory of Health, Environment and Food, Maribor, Slovenia
- Faculty of Medicine, University of Maribor, Maribor, Slovenia
| | - Majda Golob
- Faculty of Veterinary Medicine, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Tina Pirš
- Faculty of Veterinary Medicine, Institute of Microbiology and Parasitology, University of Ljubljana, Ljubljana, Slovenia
| | - Bojana Bogovič Matijašić
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
| | - Petra Mohar Lorbeg
- Department of Animal Science, Biotechnical Faculty, Institute of Dairy Science and Probiotics, University of Ljubljana, Ljubljana, Slovenia
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Vardjan T, Mohar Lorbeg P, Čanžek Majhenič A. Stability of prevailing lactobacilli and yeasts in kefir grains and kefir beverages during ten weeks of propagation. INT J DAIRY TECHNOL 2017. [DOI: 10.1111/1471-0307.12463] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Petra Mohar Lorbeg
- Department of Animal Science; Institute of Dairy Science and Probiotics; Biotechnical Faculty; University of Ljubljana; Groblje 3 1230 Domžale Slovenia
| | - Andreja Čanžek Majhenič
- Department of Animal Science; Institute of Dairy Science and Probiotics; Biotechnical Faculty; University of Ljubljana; Groblje 3 1230 Domžale Slovenia
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Obermajer T, Lipoglavšek L, Tompa G, Treven P, Lorbeg PM, Matijašić BB, Rogelj I. Colostrum of healthy Slovenian mothers: microbiota composition and bacteriocin gene prevalence. PLoS One 2015; 10:e0123324. [PMID: 25919457 PMCID: PMC4412836 DOI: 10.1371/journal.pone.0123324] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Accepted: 03/02/2015] [Indexed: 12/22/2022] Open
Abstract
Microbial communities inhabiting the breast milk microenvironment are essential in supporting mammary gland health in lactating women and in providing gut-colonizing bacterial 'inoculum' for their infants’ gastro-intestinal development. Bacterial DNA was extracted from colostrum samples of 45 healthy Slovenian mothers. Characteristics of the communities in the samples were assessed by polymerase chain reaction (PCR) coupled with denaturing gradient gel electrophoresis (DGGE) and by quantitative real-time PCR (qPCR). PCR screening for the prevalence of bacteriocin genes was performed on DNA of culturable and total colostrum bacteria. DGGE profiling revealed the presence of Staphylococcus and Gemella in most of the samples and exposed 4 clusters based on the abundance of 3 bands: Staphylococcus epidermidis/Gemella, Streptococcus oralis/pneumonia and Streptococcus salivarius. Bacilli represented the largest proportion of the communities. High prevalence in samples at relatively low quantities was confirmed by qPCR for enterobacteria (100%), Clostridia (95.6%), Bacteroides-Prevotella group (62.2%) and bifidobacteria (53.3%). Bacterial quantities (genome equivalents ml-1) varied greatly among the samples; Staphylococcus epidermidis and staphylococci varied in the range of 4 logs, streptococci and all bacteria varied in the range of 2 logs, and other researched groups varied in the range of 1 log. The quantity of most bacterial groups was correlated with the amount of all bacteria. The majority of the genus Staphylococcus was represented by the species Staphylococcus epidermidis (on average 61%), and their abundances were linearly correlated. Determinants of salivaricin A, salivaricin B, streptin and cytolysin were found in single samples. This work provides knowledge on the colostrum microbial community composition of healthy lactating Slovenian mothers and reports bacteriocin gene prevalence.
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Affiliation(s)
- Tanja Obermajer
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
- * E-mail:
| | - Luka Lipoglavšek
- Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
| | - Gorazd Tompa
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
| | - Primož Treven
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
| | - Petra Mohar Lorbeg
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
| | - Bojana Bogovič Matijašić
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
| | - Irena Rogelj
- Institute of Dairy Science and Probiotics, Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia
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