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Hadef S, Idoui T, Sifour M, Genay M, Dary-Mourot A. Screening of Wild Lactic Acid Bacteria from Algerian Traditional Cheeses and Goat Butter to Develop a New Probiotic Starter Culture. Probiotics Antimicrob Proteins 2023; 15:387-399. [PMID: 36307627 DOI: 10.1007/s12602-022-10000-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/18/2022] [Indexed: 11/24/2022]
Abstract
Twenty-five lactic acid bacterial (LAB) strains have been isolated from traditional goat butter and three types of cheese (dry Klila, frech Klila, and Bouhezza) and evaluated for technological abilities, probiotic properties, and potentials as starter cultures. The twenty-five LAB strains comprised eight strains belonging to Lactobacillus, four strains belonging to Lactococcus, eleven strains belonging to Enterococcus, and two strains belonging to Leuconostoc. A non-hierarchical cluster analysis was performed in order to select the performing strains. After carrying out the preliminary phenotypic characterizations and the probiotic potential, three strains designated as BM10, B15, and C30 belonging to the genus Lactobacillus and Enterococcus with good tolerance to acidity were selected. The strains showed a significant resistance to 0.5% bile salts and 0.4% phenol. Hemolytic activity was not detected; in addition, good hydrophobicity and autoaggregation was obtained. A significant antimicrobial activity was exhibited by all selected strains against Listeria innocua. Genotypic identification by 16S rRNA allowed the identification of B15, BM10, and C30 as Lactobacillus plantarum, Lactobacillus casei, and Enterococcus durans, respectively. The results of the current study suggest that the strains isolated from Algerian fermented dairy products have high potential as probiotic starter cultures in the goat butter and cheese industry.
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Affiliation(s)
- Sawsen Hadef
- Department of Nature and Life Sciences, Abdelhafid Boussouf University Center, RP. 26, 43000, Mila, Algeria.
- Laboratory of Biotechnology, Environment and Health, University Mohamed Seddik Benyahia of Jijel, 18000, Jijel, Algeria.
| | - Tayeb Idoui
- Laboratory of Biotechnology, Environment and Health, University Mohamed Seddik Benyahia of Jijel, 18000, Jijel, Algeria
| | - Mohamed Sifour
- Laboratory of Molecular Toxicology, Faculty of Nature and Life Sciences, University Mohamed Seddik Benyahia of Jijel, 18000, Jijel, Algeria
| | - Magali Genay
- CALBINOTOX, University of Lorraine, 54000, Nancy, France
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Yao Q, Gao L, Xu T, Chen Y, Yang X, Han M, He X, Li C, Zhou R, Yang Y. Amoxicillin Administration Regimen and Resistance Mechanisms of Staphylococcus aureus Established in Tissue Cage Infection Model. Front Microbiol 2019; 10:1638. [PMID: 31396174 PMCID: PMC6662548 DOI: 10.3389/fmicb.2019.01638] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 07/02/2019] [Indexed: 11/24/2022] Open
Abstract
Staphylococcus aureus is a zoonotic pathogen that causes various life-threatening diseases. The mechanisms of action of amoxicillin against S. aureus are unclear. Here, we established a rabbit tissue cage infection model to evaluate the relationship between the pharmacokinetic/pharmacodynamic (PK/PD) parameters of amoxicillin and selective enrichment of resistant strains of S. aureus and to elucidate the evolution of its resistance to amoxicillin. S. aureus was injected into the tissue cages at 1010 colony forming units (CFU)/mL. We injected different intramuscular concentrations of amoxicillin at doses of 5, 10, 20, and 30 mg/kg body weight once a day for 5 days and 5, 10, 20, and 30 mg/kg body weight twice a day for 2.5 days. Differences in gene expression between two differentially resistant strains and a sensitive strain were evaluated using Illumina sequencing followed by COG and KEGG analysis. RT-qPCR was carried out to validate the difference in protein translation levels. Our results demonstrated that the emergence of resistant bacteria was dose dependent within a given time interval. In the same dosage group, the appearance of resistant bacteria increased with time. The resistant bacteria showed cumulative growth, and the level of resistance increased over time. The resistant bacteria were completely inhibited when the cumulative percentage of time over a 24-h period that the drug concentration exceeded the mutant prevention concentration (MPC) (%T > MPC) was ≥52%. We also found that mecA and femX in S. aureus played a leading role in the development of resistance to amoxicillin. In conclusion, it provide references for optimizing amoxicillin regimens to treat infections caused by S. aureus.
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Affiliation(s)
- Qian Yao
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Linglin Gao
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Teng Xu
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Yun Chen
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Xin Yang
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Mengmeng Han
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Xiaotao He
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Chengheng Li
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Ruigang Zhou
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
| | - Yuhui Yang
- Hainan Key Laboratory of Tropical Animal Breeding and Disease Research, College of Animal Science and Technology, Hainan University, Haikou, China
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Incidence of residual bacterial contamination of transvaginal ultrasound probes. J Med Ultrason (2001) 2019; 46:475-479. [DOI: 10.1007/s10396-019-00941-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 03/08/2019] [Indexed: 10/27/2022]
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Omar BA, Atif HA, Mogahid ME. Comparison of three DNA extraction methods for polymerase chain reaction (PCR) analysis of bacterial genomic DNA. ACTA ACUST UNITED AC 2014. [DOI: 10.5897/ajmr2013.6459] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Pillai MM, Latha R, Sarkar G. Detection of methicillin resistance in Staphylococcus aureus by polymerase chain reaction and conventional methods: a comparative study. J Lab Physicians 2013; 4:83-8. [PMID: 23441000 PMCID: PMC3574503 DOI: 10.4103/0974-2727.105587] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background: Methicillin-resistant Staphylococcus aureus (MRSA) is a major nosocomial pathogen worldwide, which has emerged over the past 30 years as a leading cause of both nosocomial and community-acquired infections. Accurate and rapid identification of MRSA in clinical specimens is essential for timely decision on effective antimicrobial chemotherapy. Aim: The present study was conducted to compare two conventional phenotypic methods, oxacillin disk diffusion (ODD) method and mannitol salt agar (MSA) with oxacillin, with polymerase chain reaction (PCR) for mecA gene (as standard). Materials and Methods: A total of 165 consecutive clinical isolates of S. aureus received at the Department of Microbiology in our tertiary care teaching hospital were included in the study. All the isolates were subjected to ODD (1 μg) method, culture in MSA with oxacillin, and PCR for mecA gene. Results: The sensitivity and specificity of ODD test were found to be 93.5% (86.4-97.3%) and 83.5% (79.2-85.8%), respectively, and that of MSA with oxacillin were found to be 87.1% (79.5-92.3%) and 89.3% (84.8-92.5%), respectively. The time taken for diagnosing MRSA by conventional methods is 48-72 h, which is more as compared to PCR which takes 18-24 h. Conclusion: This study recommends advocating PCR for mecA gene on a regular basis for detecting methicillin resistance in S. aureus isolates isolated from sterile body fluids or from special units such as intensive care units.
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Affiliation(s)
- Manju M Pillai
- Department of Biochemistry, A.V. Medical College, Pondicherry, India
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Sánchez-Hidalgo M, Pascual J, de la Cruz M, Martín J, Kath GS, Sigmund JM, Masurekar P, Vicente F, Genilloud O, Bills GF. Prescreening bacterial colonies for bioactive molecules with Janus plates, a SBS standard double-faced microbial culturing system. Antonie van Leeuwenhoek 2012; 102:361-74. [PMID: 22562433 PMCID: PMC3397223 DOI: 10.1007/s10482-012-9746-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 04/24/2012] [Indexed: 12/21/2022]
Abstract
Despite the availability of many culture-based antibiotic screening methods, the lack of sensitive automated methods to identify functional molecules directly from microbial cells still limits the search for new biologically active compounds. The effectiveness of antibiotic detection is influenced by the solubility of the assayed compounds, indicator strain sensitivity, culture media and assay configuration. We describe a qualitative high throughput screening system for detecting cell-perturbing molecules from bacterial colonies employing two opposed agar layers sequentially formed in prototype Society for Biomolecular Screening (SBS) plates, named Janus plates. Direct assay of microbial colonies against target organisms in opposed agar layers overcomes some of the limitations of agar overlay methods. The system enables the rapid detection of extracellular cell-perturbing molecules, e.g., antibiotics, excreted directly from environmental isolates. The source bacterial colonies remain separate from the target organism. The growth layer is prepared and grown independently, so environmental strains can be grown for longer intervals, at temperatures and in media that favor their growth and metabolite expression, while the assay layer with pathogens, usually requiring nutrient-rich medium and elevated temperatures, are added later. Colonies to be tested can be precisely arrayed on the first agar surface, thus avoiding dispersion and disturbance of potential antibiotic-producing colonies by overlaying agar with the target strain. The rectangular SBS configuration facilitates factorial replication of dense microbial colony arrays for testing with multiple assays and assay conditions employing robotic colony pickers and pin tools. Opposed agar layers only slightly reduced the effectiveness for detecting growth inhibition from pure antibiotics compared to single-layer agar diffusion assays. The Janus plate enabled an automation-assisted workflow where a lone operator can effectively identify and accumulate bioactive soil bacterial strains within a few weeks. We also envisage the method's utility for functional prescreening colonies of clones from genomic and metagenomic libraries or improved strains originating from mutagenized cells.
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Affiliation(s)
- Marina Sánchez-Hidalgo
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Javier Pascual
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Mercedes de la Cruz
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Jesús Martín
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Gary S. Kath
- Design-To-Prototype LLC, 2671 Sky Top Drive, Scotch Plains, NJ 07076 USA
| | - Janet M. Sigmund
- Natural Products Discovery Institute, 3805 Old Easton Road, Doylestown, PA 18902 USA
| | - Prakash Masurekar
- Department of Plant Biology & Pathology, Rutgers University, Foran Hall, Cook Campus 59 Dudley Rd., New Brunswick, NJ 08901 USA
| | - Francisca Vicente
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Olga Genilloud
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
| | - Gerald F. Bills
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Avda. del Conocimiento 3, Parque Tecnológico de Ciencias de la Salud, 18100 Armilla, Granada, Spain
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