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Hudec E, Mudroňová D, Marcinčák S, Bartkovský M, Makiš A, Faldyna M, Ratvaj M, Karaffová V. The effect of Limosilactobacillus fermentum 2i3 and 0.6% addition of humic substances on production parameters and the immune system of broilers. Poult Sci 2024; 103:103884. [PMID: 38865771 PMCID: PMC11223114 DOI: 10.1016/j.psj.2024.103884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Revised: 05/10/2024] [Accepted: 05/18/2024] [Indexed: 06/14/2024] Open
Abstract
The widespread use of antibiotics in the poultry industry as growth promoters has led to the emergence of bacterial resistance, which poses a significant health risk to humans and animals. Substances of natural origin, such as probiotic bacteria and humic substances, can be a promising solution. The aim of this experiment was to study the effect of the administration of a probiotic strain of Limosilactobacillus fermentum 2i3 and/or a new formula of humic substances specifically designed for detoxification on the production parameters, including gene expression of myogenic growth factors and selected parameters of the immune response. We found that production parameters such as feed conversion ratio and weekly weight gain, as well as gene expression of mucin-2 and immunoglobulin A, were positively influenced mainly by the administration of L. fermentum 2i3. Similarly, the percentage of active phagocytes and their absorption capacity as well as the proportions of CD8+ and CD4+CD8+ T-lymphocyte subpopulations were significantly increased. The addition of humic substances, either alone or in combination with probiotics, significantly reduced the aforementioned parameters compared to the control. On the other hand, the relative gene expression for all myogenic growth factors was the highest in the humic group alone. Based on the results obtained, we can confirm the immunostimulating effect of L. fermentum 2i3 administered in drinking water, which also had an impact on important production parameters of broiler meat. On the other hand, in the combined group there was no expected potentiation of the positive effects on the observed parameters.
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Affiliation(s)
- E Hudec
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - D Mudroňová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - S Marcinčák
- Department of Food Hygiene and Technology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - M Bartkovský
- Department of Food Hygiene and Technology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - A Makiš
- Department of Food Hygiene and Technology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - M Faldyna
- Veterinary Research Institute, Brno, Czech Republic
| | - M Ratvaj
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - V Karaffová
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, Košice, Slovakia.
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Karaffová V, Teleky J, Pintarič M, Langerholc T, Mudroňová D, Hudec E, Ševčíková Z. Application of Lactobacillus reuteri B1/1 ( Limosilactobacillus reuteri) Improves Immunological Profile of the Non-Carcinogenic Porcine-Derived Enterocytes. Life (Basel) 2023; 13:life13051090. [PMID: 37240735 DOI: 10.3390/life13051090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/20/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
In our previous studies, Lactobacillus reuteri B1/1, which was renamed Limosilactobacillus reuteri (L. reuteri), was able to modulate the production of pro-inflammatory cytokines and other components of the innate immune response in vitro and in vivo. In this study, we evaluated the effect of Lactobacillus reuteri B1/1 in two concentrations (1 × 107 and 1 × 109 CFU) on the metabolic activity, adherence ability and relative gene expression of pro-inflammatory interleukins (IL-1β, IL-6, IL-8, IL-18), lumican and olfactomedin 4 produced by non-carcinogenic porcine-derived enterocytes (CLAB). CLAB cells were cultured in a 12-well cell culture plate at a concentration of 4 × 105 cells/well in DMEM medium in a controlled humidified atmosphere for 48 h. A 1 mL volume of each probiotic bacterial suspension was added to the CLAB cells. Plates were incubated for 2 h and 4 h. Our results revealed that L. reuteri B1/1 was able to adhere to CLAB cells in sufficient numbers in both concentrations. In particular, the concentration of 109L. reuteri B1/1 allowed to modulate the gene expression of pro-inflammatory cytokines, as well as to increase the metabolic activity of the cells. In addition, administration of L. reuteri B1/1 in both concentrations significantly stimulated gene expression for both proteins in the CLAB cell line after 4 h of incubation.
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Affiliation(s)
- Viera Karaffová
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy in Košice, Komenského 73, 04181 Košice, Slovakia
| | - Jana Teleky
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy in Košice, Komenského 73, 04181 Košice, Slovakia
| | - Maša Pintarič
- Department of Microbiology, Biochemistry, Molecular Biology and Biotechnology, Faculty of Agriculture and Life Sciences, University of Maribor, Pivola 10, 2311 Hoče, Slovenia
| | - Tomaž Langerholc
- Department of Microbiology, Biochemistry, Molecular Biology and Biotechnology, Faculty of Agriculture and Life Sciences, University of Maribor, Pivola 10, 2311 Hoče, Slovenia
| | - Dagmar Mudroňová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy in Košice, Komenského 73, 04181 Košice, Slovakia
| | - Erik Hudec
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy in Košice, Komenského 73, 04181 Košice, Slovakia
| | - Zuzana Ševčíková
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy in Košice, Komenského 73, 04181 Košice, Slovakia
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The Effect of Enterococcus faecium AL41 on the Acute Phase Proteins and Selected Mucosal Immune Molecules in Broiler Chickens. Life (Basel) 2022; 12:life12040598. [PMID: 35455089 PMCID: PMC9030174 DOI: 10.3390/life12040598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/12/2022] [Accepted: 04/14/2022] [Indexed: 11/25/2022] Open
Abstract
Probiotic bacteria, including the Enterococcus faecium strain, can improve intestinal mucosal health by several mechanisms, including modulation of the immune response, as well as by improving the protective function of the epithelial barrier. In this study, we tested the effect of Enterococcus faecium AL41 on the acute phase proteins response (blood), gene expression of selected molecules of mucosal immunity (immunoglobulin A, mucin-2, insulin-like growth factor 2) and mucus production (all parts of the small intestine) in broilers. Eighty broiler chicks were divided into two groups: a control and E. faecium AL41 (birds were inoculated with AL41 for 7 days) group. The whole experiment lasted 11 days. Our results revealed that the administration of E. faecium AL41 had no substantial effect on the concentrations of acute phase proteins, but we recorded a significant increase in β- and γ-globulin fractions at the end of the experiment, which may indicate an improvement in the immune status. A significant prolonged stimulatory effect of E. faecium AL41 on the relative expression of molecules (immunoglobulin A, mucin-2) as well as on the dynamic of mucus production in the chicken intestine was observed. In addition, AL41 significantly reduced the total number of enterococci in the cecum and faeces.
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Relationship of mRNA Expression of Selected Genes in Peripheral Blood and Synovial Fluid in Cranial Cruciate Ligament Deficient Stifles of Dogs. Animals (Basel) 2022; 12:ani12060754. [PMID: 35327152 PMCID: PMC8944536 DOI: 10.3390/ani12060754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 02/04/2023] Open
Abstract
Simple Summary The cranial cruciate ligament rupture is characterized by chronic inflammation, osteoarthritis of the stifle joint, and extracellular matrix degeneration of the ligament itself in dogs. Early pre-clinical cranial cruciate ligament alteration cannot be detected by clinical examination or standard radiography. Therefore, we assessed the possible relationship of inflammatory markers in peripheral blood and synovial fluid of affected stifle joints in comparison to a control. We also evaluated components of the extracellular matrix of ruptured ligaments and finally compared the tibial plateau angle and the anatomical-mechanical angle between groups. Some of the assessed inflammatory markers were significantly increased in both the peripheral blood and synovial fluid compared with the control, as were collagens. The tibial plateau angle was not significantly different; however, the anatomical-mechanical angle significantly increased in the ruptured ligaments. Our results suggest a possible positive relationship between inflammatory markers of blood and synovial fluid in cranial cruciate ligament deficient stifles compared to the control. These findings may support both local and systemic inflammation process at the same time during osteoarthritis progression. Based on this, it would be interesting to investigate the predictive osteoarthritis pathway of inflammatory cytokines, matrix metalloproteinases, and their effect on the extracellular matrix components of the cranial cruciate ligament in future studies. Abstract The cranial cruciate ligament rupture (CrCLR) is characterized by chronic inflammation and osteoarthritis (OA) of the stifle joint and extracellular matrix (ECM) degeneration of the ligament itself in dogs. Generally, OA may arise from chronic low-grade systemic inflammation. We assessed the possible relationship of inflammatory markers in the peripheral blood (PB) and synovial fluid (SF) of affected stifle joints in comparison to a control. Moreover, no study has shown the possible association between PB and SF levels of inflammatory markers in CrCLR stifles of dogs in veterinary medicine yet. We also evaluated components of ECM of CrCLR and finally compared the tibial plateau angle (TPA) and the anatomical-mechanical angle (AMA) between groups. Samples from PB and SF were examined for mRNA expression of interleukins, TNF-α and INF-γ. ECM components—collagen 1A1 and 3A1 and elastin—were examined for mRNA expression from SF. The level of relative expression for IL-1β, IL-8 and IFN-γ was significantly increased in both PB and SF in CrCLR stifles as compared with the control. Collagens were also significantly increased in CrCLR stifles. TPA was not significantly different; however, the AMA angle significantly increased in the CrCLR group. Our results suggest a possible relationship between PB and SF levels of inflammatory markers in CrCLR stifles of dogs.
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Revajová V, Benková T, Karaffová V, Levkut M, Selecká E, Dvorožňáková E, Ševčíková Z, Herich R, Levkut M. Influence of Immune Parameters after Enterococcus faecium AL41 Administration and Salmonella Infection in Chickens. Life (Basel) 2022; 12:life12020201. [PMID: 35207488 PMCID: PMC8878764 DOI: 10.3390/life12020201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 11/16/2022] Open
Abstract
Immune response of day-old chicks infected with Salmonella Enteritidis PT4 and preventive administration of Enterococcus faecium AL41 were studied using hematology and flow cytometry of immunocompetent cells in blood, cecum, bursa and spleen for 11 days, and included 220 animals divided into four groups (n = 55). E. faecium AL41 was administered for 7 days to EF and EFSE groups and on day 4 SE and EFSE groups were infected with Salmonella Enteritidis. Values of monocytes at 4 dpi significantly increased in EFSE and lymphocytes at 7 dpi in EF groups. Blood CD3, CD4, CD8 and IgM lymphocytes improved in EF and EFSE groups and IgA in EF group at 4 dpi. Phagocytic activity of probiotic groups was improved in both samples. Cecal IEL and LPL lymphocytes showed at 7 dpi stimulation of CD3, CD4 and CD8 subpopulations in probiotic groups, especially in EFSE group, IgA IEL and IgA with IgM LPL in EF groups. Bursa Fabricii at 7 dpi presented overstimulation of IgG subpopulation in SE group, spleen CD3 and CD8 in EF and EFSE groups. E. faecium AL41 revealed the protective effect and positive influence on the local and systemic immune response in Salmonella Enteritidis PT4 infected chickens.
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Affiliation(s)
- Viera Revajová
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Terézia Benková
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Viera Karaffová
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
- Correspondence: ; Tel.: +421-905871840
| | - Martin Levkut
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Emília Selecká
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Emília Dvorožňáková
- Institute of Parasitology, Slovak Academy of Sciences, 040 01 Košice, Slovakia;
| | - Zuzana Ševčíková
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Róbert Herich
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
| | - Mikuláš Levkut
- Department of Morphological Disciplines, University of Veterinary Medicine and Pharmacy, 041 81 Košice, Slovakia; (V.R.); (T.B.); (M.L.); (E.S.); (Z.Š.); (R.H.); (M.L.)
- Institute of Neuroimmunology, Slovak Academy of Science, 845 10 Bratislava, Slovakia
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The Probiotic Lactobacillus fermentum Biocenol CCM 7514 Moderates Campylobacter jejuni-Induced Body Weight Impairment by Improving Gut Morphometry and Regulating Cecal Cytokine Abundance in Broiler Chickens. Animals (Basel) 2021; 11:ani11010235. [PMID: 33477806 PMCID: PMC7832853 DOI: 10.3390/ani11010235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/09/2021] [Accepted: 01/13/2021] [Indexed: 12/12/2022] Open
Abstract
Simple Summary High consumption of chicken meat and derived products has been associated with Campylobacter jejuni infections in humans. Probiotics have been exploited successfully with the aim of preventing colonization by unwanted microorganisms in birds. In this research, we investigated the effects of Lactobacillus fermentum Biocenol CCM 7514 supplementation on body weight, morphometry of the intestine and the cecal cytokine response. Probiotic-treated chickens showed higher body weight values than those exposed to C. jejuni or reared under control conditions. These differences in body weight were correlated to the overall characteristics of the small intestine, with larger villi and deeper crypts, observed in chickens administered with L. fermentum; such conditions are known to favor nutrient absorption. Likewise, body weight proved to be correlated to transcript abundance of IL-1β and IL-13. In probiotic-treated birds, such factors were upregulated in comparison to what was detected in C. jejuni-infected chickens; these interleukins are considered crucial in the response to invading pathogens. Clearly, these results show that administration of this probiotic strain lessens the negative effects elicited by C. jejuni and ultimately improves chicken body weight. Abstract This research was conducted to investigate if the administration of the probiotic Lactobacillus fermentum could influence body weight, intestinal morphometry and the cecal cytokine response in Campylobacter jejuni-infected chickens. Seventy-two 1-day old COBB 500 male chicks were allocated randomly into four experimental groups. (I) Control group (C), in which chicks were left untreated. (II) LB group, treated with L. fermentum. (III) Cj group, infected with C. jejuni and (IV) coexposure group in which both bacteria were administered. Body weight was registered and then all birds were slaughtered; samples from the small intestine and caecum were collected at 4- and 7-days post infection. The experiment lasted eleven days. Villi height and crypt depth ratios of the duodenum, jejunum and ileum were evaluated using appropriate software, while reverse transcription quantitative PCR (RT-qPCR) was utilized for assessing transcript levels of key cecal inflammatory cytokines (IL-1β, IL-18, IL-17, IL-15, IL13 and IL-4). Campylobacter-infected birds showed lower body weight values than those supplemented with the probiotic; these birds, in turn, proved to be heavier than those reared under control conditions. L. fermentum administration improved morphometrical parameters of the duodenum, jejunum and ileum; in general, villi were larger and crypts deeper than those identified in control conditions. Moreover, the negative effects elicited by C. jejuni were not observed in chickens exposed to the probiotic. Significant differences were also determined with regards to transcript abundance of all evaluated cytokines in the caecum. C. jejuni induced a downregulation of the studied interleukins; however, such a response was heightened by administration of L. fermentum, with an increase rate of transcription that promoted a more effective response to a C. jejuni infection. The effects of experimental treatments proved to vary between sampling points. Conclusively, these results demonstrate that L. fermentum lessens the negative effects elicited by C. jejuni on body weight by alleviating the impact on intestinal morphometry and cecal cytokine response, which ultimately improve chicken growth performance.
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Rajput DS, Zeng D, Khalique A, Rajput SS, Wang H, Zhao Y, Sun N, Ni X. Pretreatment with probiotics ameliorate gut health and necrotic enteritis in broiler chickens, a substitute to antibiotics. AMB Express 2020; 10:220. [PMID: 33336284 PMCID: PMC7746796 DOI: 10.1186/s13568-020-01153-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Accepted: 11/27/2020] [Indexed: 12/13/2022] Open
Abstract
Necrotic enteritis (NE) is being considered as one of the most important intestinal diseases in the recent poultry production systems, which causes huge economic losses globally. NE is caused by Clostridium perfringens, a pathogenic bacterium, and normal resident of the intestinal microflora of healthy broiler chickens. Gastrointestinal tract (GIT) of broiler chicken is considered as the most integral part of pathogen's entrance, their production and disease prevention. Interaction between C. perfringens and other pathogens such as Escherichia coli and Salmonella present in the small intestine may contribute to the development of NE in broiler chickens. The antibiotic therapy was used to treat the NE; however European Union has imposed a strict ban due to the negative implications of drug resistance. Moreover, antibiotic growth promoters cause adverse effects on human health as results of withdrawal of antibiotic residues in the chicken meat. After restriction on use of antibiotics, numerous studies have been carried out to investigate the alternatives to antibiotics for controlling NE. Thus, possible alternatives to prevent NE are bio-therapeutic agents (Probiotics), prebiotics, organic acids and essential oils which help in nutrients digestion, immunity enhancement and overall broiler performance. Recently, probiotics are extensively used alternatives to antibiotics for improving host health status and making them efficient in production. The aim of review is to describe a replacement to antibiotics by using different microbial strains as probiotics such as bacteria and yeasts etc. having bacteriostatic properties which inhibit growth of pathogens and neutralize the toxins by different modes of action.
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Šefcová M, Larrea-Álvarez M, Larrea-Álvarez C, Revajová V, Karaffová V, Koščová J, Nemcová R, Ortega-Paredes D, Vinueza-Burgos C, Levkut M, Herich R. Effects of Lactobacillus Fermentum Supplementation on Body Weight and Pro-Inflammatory Cytokine Expression in Campylobacter Jejuni-Challenged Chickens. Vet Sci 2020; 7:vetsci7030121. [PMID: 32872452 PMCID: PMC7557755 DOI: 10.3390/vetsci7030121] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 08/24/2020] [Accepted: 08/26/2020] [Indexed: 12/12/2022] Open
Abstract
Due to the interest in using probiotic bacteria in poultry production, this research was focused on evaluating the effects of Lactobacillus fermentum Biocenol CCM 7514 administration on body weight gain and cytokine gene expression in chickens challenged with Campylobacter jejuni. One-hundred and eight 1-day old COBB 500 broiler chickens were equally assigned to four experimental groups at random. In the control group (C) chicks were left untreated, whereas in groups LB and LBCj a suspension of L. fermentum was administered. A suspension of C. jejuni was subsequently applied to groups Cj and LBCj. Body weight was registered, and the individuals were later slaughtered; cecum samples were collected at 12, 36 and 48 h post-infection (hpi). The entire experiment lasted seven days. Reverse transcription quantitative PCR (RT-qPCR) was used to determine expression levels of IL-1β, IL-15, IL-17, and IL-18 at each time point. Pathogen-infected individuals were observed to weigh significantly less than those fed with the probiotic. Significant differences were also found in transcript abundance; expression of IL-15 was downregulated by the probiotic and upregulated by C. jejuni. The effects of bacterial treatments were time-dependent, as the expression profiles differed at later stages. The present outcomes demonstrate that L. fermentum both reduces the impact of C. jejuni infection on chicken body weight and regulates positively pro-inflammatory cytokine expression, which ultimately increase bird well-being and improves production.
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Affiliation(s)
- Miroslava Šefcová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (V.R.); (V.K.); (M.L.); (R.H.)
- Correspondence: ; Tel.: +421-907468978
| | - Marco Larrea-Álvarez
- School of Biological Sciences and Engineering, Yachay-Tech University Hacienda San José, Imbabura, Urcuquí 100650, Ecuador;
| | - César Larrea-Álvarez
- Research Unit, Life Science Initiative (LSI), lsi-ec.com, Quito 170102, Ecuador; (C.L.-Á.); (D.O.-P.)
| | - Viera Revajová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (V.R.); (V.K.); (M.L.); (R.H.)
| | - Viera Karaffová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (V.R.); (V.K.); (M.L.); (R.H.)
| | - Jana Koščová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (J.K.); (R.N.)
| | - Radomíra Nemcová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (J.K.); (R.N.)
| | - David Ortega-Paredes
- Research Unit, Life Science Initiative (LSI), lsi-ec.com, Quito 170102, Ecuador; (C.L.-Á.); (D.O.-P.)
- Facultad de Medicina Veterinaria y Zootecnia, Unidad de Investigación en Enfermedades Transmitidas por Alimentos y Resistencia a los Antimicrobianos (UNIETAR), Universidad Central del Ecuador, Quito 170129, Ecuador;
| | - Christian Vinueza-Burgos
- Facultad de Medicina Veterinaria y Zootecnia, Unidad de Investigación en Enfermedades Transmitidas por Alimentos y Resistencia a los Antimicrobianos (UNIETAR), Universidad Central del Ecuador, Quito 170129, Ecuador;
| | - Mikuláš Levkut
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (V.R.); (V.K.); (M.L.); (R.H.)
- Institute of Neuroimmunology, Slovak Academy of Science, Dúbravská cesta 5779/9, 84510 Bratislava, Slovakia
| | - Róbert Herich
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 040 01 Košice, Slovakia; (V.R.); (V.K.); (M.L.); (R.H.)
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Karaffová V, Revajová V, Koščová J, Gancarčíková S, Nemcová R, Ševčíková Z, Herich R, Levkut M. Local intestinal immune response including NLRP3 inflammasome in broiler chicken infected with Campylobacter jejuni after administration of Lactobacillus reuteri B1/1. FOOD AGR IMMUNOL 2020. [DOI: 10.1080/09540105.2020.1788516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- V. Karaffová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - V. Revajová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - J. Koščová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - S. Gancarčíková
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - R. Nemcová
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - Z. Ševčíková
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - R. Herich
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
| | - M. Levkut
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Košice, Slovakia
- Neuroimmunological Institute SAS, Bratislava, Slovakia
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Anaya-Loyola MA, García-Marín G, García-Gutiérrez DG, Castaño-Tostado E, Reynoso-Camacho R, López-Ramos JE, Enciso-Moreno JA, Pérez-Ramírez IF. A mango (Mangifera indica L.) juice by-product reduces gastrointestinal and upper respiratory tract infection symptoms in children. Food Res Int 2020; 136:109492. [PMID: 32846573 DOI: 10.1016/j.foodres.2020.109492] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/18/2022]
Abstract
The study aimed to evaluate the effect of a mango juice by-product (JBP) on upper-respiratory and gastrointestinal tract infection symptoms in children (6-8 y) in a randomized, double-blind, parallel, case-control study. For two months, children drank either flavored water (control group) or a mango JBP-based beverage (0.04 g·ml-1; treatment group); such beverage provided 1.1 g, 278.6 mg and 7.8 mg of dietary fiber, extractable polyphenols (mono-to-hepta galloyl hexosides, mangiferin), and hydrolysable polyphenols (ellagic/gallic acid) per portion, respectively. Mango JBP reduced the incidence of gastrointestinal (flatulencies and abdominal inflammation; p ≤ 0.007) and upper-tract respiratory (crystalline mucus, itchy throat, runny nose, itchy nose, and sneezing; p ≤ 0.038) and such benefits were associated to increased serum levels of PAI-I, MIP-1a, and MIP-1b (p ≤ 0.04) and decreased levels of IgG, MIF, and osteopontin (p ≤ 0.01). We concluded that JBP-based beverage has immunomodulatory properties, useful to prevent or even treat common infectious diseases in school-age children.
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Affiliation(s)
- Miriam A Anaya-Loyola
- Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Querétaro 76230, Mexico
| | | | | | | | | | - Juan E López-Ramos
- Unidad de Investigación Biomédica de Zacatecas, IMSS, Zacatecas 98000, Mexico
| | | | - Iza F Pérez-Ramírez
- Facultad de Química, Universidad Autónoma de Querétaro, Querétaro 76010, Mexico.
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11
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The Control of Intestinal Inflammation: A Major Objective in the Research of Probiotic Strains as Alternatives to Antibiotic Growth Promoters in Poultry. Microorganisms 2020; 8:microorganisms8020148. [PMID: 31973199 PMCID: PMC7074883 DOI: 10.3390/microorganisms8020148] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/17/2020] [Accepted: 01/18/2020] [Indexed: 12/31/2022] Open
Abstract
The reduction of antimicrobial resistance is a major challenge for the scientific community. In a few decades, infections by resistant bacteria are forecasted to be the main cause of death in the world. The withdrawal of antibiotics as growth promoters and their preventive use in animal production is essential to avoid these resistances, but this may impair productivity and health due to the increase in gut inflammation. This reduction in productivity aggravates the problem of increasing meat demand in developing countries and limits the availability of raw materials. Probiotics are promising products to address this challenge due to their beneficial effects on microbiota composition, mucosal barrier integrity, and immune system to control inflammation. Although many modes of action have been demonstrated, the scientific community is not able to describe the specific effects that a probiotic should induce on the host to maximize both productivity and animal health. First, it may be necessary to define what are the innate immune pathways acting in the gut that optimize productivity and health and to then investigate which probiotic strain is able to induce the specific effect needed. This review describes several gaps in the knowledge of host-microbiota-pathogen interaction and the related mechanisms involved in the inflammatory response not demonstrated yet in poultry.
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12
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Abstract
Abstract
The objective of this review was to discuss some of the criteria which influence the selection of microorganisms with probiotic properties based on their mode of action. The most common bacteria that belong to the “group” probiotics are the Lactobacillus and Bifidobacterium species/strains. Probiotics have benefits and effects by their mechanism of action in different axial locations such as: producing substances, influencing immune function and response, modification as well as maintenance of a healthy population of microorganisms in the intestinal environment. Probiotics have demonstrated significant potential as therapeutic options for a variety of diseases Potential peripheral pathways that link probiotic ingestion in the brain function are focused on the role of the vagal afferent nerve signalling and changes in the cerebral levels of neuromodulators. The application of probiotic microorganisms represents a way to effectively influence the composition of the intestinal microbiome and the immune system of the host, as well as they can be considered as a suitable alternative to influence a healthy quality of life.
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13
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Šefcová M, Levkut M, Bobíková K, Karaffová V, Revajová V, Maruščáková IC, Levkutová M, Ševčíková Z, Herich R, Levkut M. Cytokine response after stimulation of culture cells by zinc and probiotic strain. In Vitro Cell Dev Biol Anim 2019; 55:830-837. [PMID: 31520371 DOI: 10.1007/s11626-019-00401-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 08/08/2019] [Indexed: 01/06/2023]
Abstract
Intestinal porcine epithelial cells were used for an in vitro analysis of mRNA expression levels of inflammatory cytokines (IL-8, IL-18) and transcriptional factors (MyD88 and NF-κβ). Cells were exposed to inorganic and organic zinc sources (in two different concentrations-50 μmol/L and 100 μmol/L) alone or combined with Lactobacillus reuteri B6/1, which was also applied individually. The total exposure time was 4 h. Quantitative reverse transcriptase PCR was used to determine expression levels of the aforementioned parameters. In general, upregulation was observed; however, a decrease of some mRNA's abundance was also determined. Differences in expression were analysed statistically using ANOVA and Tukey analyses. High relative expression was shown for IL-8, IL-18 and MyD88 in groups treated with 100 μmol/L of inorganic sources of zinc (ZnSO4) (p < 0.05), while groups treated with the organic form did not exhibit significant changes in expression. Also, 50 μmol/L of either zinc source did not significantly modify the transcriptional profile of the cytokines and transcription factors, showing that even inorganic sources, at lower concentrations, do not elicit a significant inflammatory reaction. In summary, supplementation of organic zinc source (Gly-Zn chelate) ensures that IL-8, IL-18, MyD88 and NF-κβ expression levels are not positively regulated. In contrast, inorganic sources of zinc (ZnSO4) could induce an inflammatory reaction. However, this response could be dampened if L. reuteri B6/1 is administered, showing the helpful aspect of using probiotics to modulate an inflammatory response. Conclusively, the use Gly-Zn chelate appears as an optimal alternative for Zn administration that does not compromise normal intestinal homeostasis.
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Affiliation(s)
- Miroslava Šefcová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic.
| | - Martin Levkut
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Katarína Bobíková
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Viera Karaffová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Viera Revajová
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Ivana Cingeľová Maruščáková
- Department of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Mária Levkutová
- Department of Epizootiology and Parasitology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Zuzana Ševčíková
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Róbert Herich
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
| | - Mikuláš Levkut
- Department of Pathological Anatomy and Pathological Physiology, University of Veterinary Medicine and Pharmacy, Komenského 73, 04181, Košice, Slovak Republic
- Institute of Neuroimmunology, Slovak Academy of Science, Dúbravská cesta 9, 84510, Bratislava, Slovak Republic
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14
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Wu Y, Zhen W, Geng Y, Wang Z, Guo Y. Pretreatment with probiotic Enterococcus faecium NCIMB 11181 ameliorates necrotic enteritis-induced intestinal barrier injury in broiler chickens. Sci Rep 2019; 9:10256. [PMID: 31311959 PMCID: PMC6635415 DOI: 10.1038/s41598-019-46578-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 06/28/2019] [Indexed: 02/08/2023] Open
Abstract
The dysfunction of tight-junction integrity caused by necrotic enteritis (NE) is associated with decreased nutrient absorption and gut injury in broiler chickens. Although probiotic Enterococcus faecium (E. faecium) has been reported to possess immune-regulatory characteristics and can prevent diarrhea in pigs, very little information exists in relation to the specific regulatory impact of E. faecium NCIMB 11181 on NE-induced intestinal barrier injury of broiler chickens. This study was conducted to investigate the protective effects of probiotic E. faecium NCIMB 11181 on NE-induced intestinal barrier injury in broiler chickens. The study also aimed to elucidate the mechanisms that underpin these protective effects. One hundred and eighty Arbor Acres (AA) broiler chicks (one day old) were randomly assigned using a 2 × 2 factorial arrangement into two groups fed different levels of dietary E. faecium NCIMB 11181 (0 or 2 × 108 CFU/kg of diet) and two disease-challenge groups (control or NE challenged). The results showed that NE induced body weight loss, intestinal lesions, and histopathological inflammation, as well as intestinal-cell apoptosis. These symptoms were alleviated following the administration of probiotic E. faecium NCIMB 11181. Pretreatment with probiotic E. faecium NCIMB 11181 significantly upregulated the expression of the Claudin-1 gene encoding a tight-junction protein. Claudin-1 and HSP70 protein expression were also increased in the jejunum regardless of NE infection. Furthermore, NE-infected birds fed with E. faecium displayed notable increases in MyD88, NF-κB, iNOS, PI3K, GLP-2, IL-1β, IL-4, and HSP70 mRNA expression. E. faecium NCIMB 11181 administration also significantly improved the animals’ intestinal microbial composition regardless of NE treatment. These findings indicated that addition of E. faecium NCIMB 11181 to poultry feed is effective in mitigating NE-induced gut injury, possibly by strengthening intestinal mucosal barrier function, as well as modulating gut microflora and intestinal mucosal immune responses.
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Affiliation(s)
- Yuanyuan Wu
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Wenrui Zhen
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yanqiang Geng
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Zhong Wang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China.
| | - Yuming Guo
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
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15
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Ren D, Wang D, Liu H, Shen M, Yu H. Two strains of probiotic Lactobacillus enhance immune response and promote naive T cell polarization to Th1. FOOD AGR IMMUNOL 2019. [DOI: 10.1080/09540105.2019.1579785] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Dayong Ren
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, People’s Republic of China
| | - Di Wang
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, People’s Republic of China
| | - Hongyan Liu
- College of Chinese Herbal Medicine, Jilin Agricultural University, Changchun, People’s Republic of China
| | - Minghao Shen
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, People’s Republic of China
| | - Hansong Yu
- College of Food Science and Engineering, Jilin Agricultural University, Changchun, People’s Republic of China
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16
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Nihashi Y, Ono T, Kagami H, Takaya T. Toll-like receptor ligand-dependent inflammatory responses in chick skeletal muscle myoblasts. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2019; 91:115-122. [PMID: 30389519 DOI: 10.1016/j.dci.2018.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/29/2018] [Accepted: 10/29/2018] [Indexed: 06/08/2023]
Abstract
Toll-like receptors (TLRs) are a group of sensory receptors which are capable of recognizing a microbial invasion and activating innate immune system responses, including inflammatory responses, in both immune and non-immune cells. However, TLR functions in chick myoblasts, which are myogenic precursor cells contributing to skeletal muscle development and growth, have not been studied. Here, we report the expression patterns of TLR genes as well as TLR ligand-dependent transcriptions of interleukin (IL) genes in primary-cultured chick myoblasts. Almost TLR genes were expressed both in layer and broiler myoblasts but TLR1A was detected only in embryonic layer chick myoblasts. Chick TLR1/2 ligands, Pam3CSK4 and FSL-1, induced inflammatory ILs in both layer and broiler myoblasts but a TLR4 ligand, lipopolysaccharide, scarcely promoted. This is the first report on TLR ligand-dependent inflammatory responses in chick myoblasts, which may provide useful information to chicken breeding and meat production industries.
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Affiliation(s)
- Yuma Nihashi
- Department of Agriculture, Graduate School of Science and Technology, Shinshu University, Japan
| | - Tamao Ono
- Department of Agriculture, Graduate School of Science and Technology, Shinshu University, Japan; Department of Agricultural and Life Science, Faculty of Agriculture, Shinshu University, Japan; Department of Interdisciplinary Genome Sciences and Cell Metabolism, Institute for Biomedical Sciences, Shinshu University, Japan
| | - Hiroshi Kagami
- Department of Agriculture, Graduate School of Science and Technology, Shinshu University, Japan; Department of Agricultural and Life Science, Faculty of Agriculture, Shinshu University, Japan
| | - Tomohide Takaya
- Department of Agriculture, Graduate School of Science and Technology, Shinshu University, Japan; Department of Agricultural and Life Science, Faculty of Agriculture, Shinshu University, Japan; Department of Interdisciplinary Genome Sciences and Cell Metabolism, Institute for Biomedical Sciences, Shinshu University, Japan.
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17
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Sutton JT, Helmkampf M, Steiner CC, Bellinger MR, Korlach J, Hall R, Baybayan P, Muehling J, Gu J, Kingan S, Masuda BM, Ryder OA. A High-Quality, Long-Read De Novo Genome Assembly to Aid Conservation of Hawaii's Last Remaining Crow Species. Genes (Basel) 2018; 9:genes9080393. [PMID: 30071683 PMCID: PMC6115840 DOI: 10.3390/genes9080393] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 07/23/2018] [Accepted: 07/27/2018] [Indexed: 11/16/2022] Open
Abstract
Genome-level data can provide researchers with unprecedented precision to examine the causes and genetic consequences of population declines, which can inform conservation management. Here, we present a high-quality, long-read, de novo genome assembly for one of the world’s most endangered bird species, the ʻAlalā (Corvus hawaiiensis; Hawaiian crow). As the only remaining native crow species in Hawaiʻi, the ʻAlalā survived solely in a captive-breeding program from 2002 until 2016, at which point a long-term reintroduction program was initiated. The high-quality genome assembly was generated to lay the foundation for both comparative genomics studies and the development of population-level genomic tools that will aid conservation and recovery efforts. We illustrate how the quality of this assembly places it amongst the very best avian genomes assembled to date, comparable to intensively studied model systems. We describe the genome architecture in terms of repetitive elements and runs of homozygosity, and we show that compared with more outbred species, the ʻAlalā genome is substantially more homozygous. We also provide annotations for a subset of immunity genes that are likely to be important in conservation management, and we discuss how this genome is currently being used as a roadmap for downstream conservation applications.
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Affiliation(s)
- Jolene T Sutton
- Department of Biology, University of Hawaii at Hilo, Hilo, HI 96720, USA.
| | - Martin Helmkampf
- Department of Biology, University of Hawaii at Hilo, Hilo, HI 96720, USA.
| | - Cynthia C Steiner
- Institute for Conservation Research, San Diego Zoo, Escondido, CA 92027, USA.
| | - M Renee Bellinger
- Department of Biology, University of Hawaii at Hilo, Hilo, HI 96720, USA.
| | | | | | | | | | - Jenny Gu
- Pacific Biosciences, Menlo Park, CA 94025, USA.
| | | | - Bryce M Masuda
- Institute for Conservation Research, San Diego Zoo Global, Volcano, HI 96785, USA.
| | - Oliver A Ryder
- Institute for Conservation Research, San Diego Zoo, Escondido, CA 92027, USA.
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18
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Relation to enterocins of variable Aeromonas species isolated from trouts of Slovakian aquatic sources and detected by MALDI-TOF mass spectrometry. Folia Microbiol (Praha) 2018; 63:749-755. [DOI: 10.1007/s12223-018-0616-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 05/15/2018] [Indexed: 11/26/2022]
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19
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Coadministration of the Campylobacter jejuni N-Glycan-Based Vaccine with Probiotics Improves Vaccine Performance in Broiler Chickens. Appl Environ Microbiol 2017; 83:AEM.01523-17. [PMID: 28939610 DOI: 10.1128/aem.01523-17] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/13/2017] [Indexed: 01/01/2023] Open
Abstract
Source attribution studies report that the consumption of contaminated poultry is the primary source for acquiring human campylobacteriosis. Oral administration of an engineered Escherichia coli strain expressing the Campylobacter jejuni N-glycan reduces bacterial colonization in specific-pathogen-free leghorn chickens, but only a fraction of birds respond to vaccination. Optimization of the vaccine for commercial broiler chickens has great potential to prevent the entry of the pathogen into the food chain. Here, we tested the same vaccination approach in broiler chickens and observed similar efficacies in pathogen load reduction, stimulation of the host IgY response, the lack of C. jejuni resistance development, uniformity in microbial gut composition, and the bimodal response to treatment. Gut microbiota analysis of leghorn and broiler vaccine responders identified one member of Clostridiales cluster XIVa, Anaerosporobacter mobilis, that was significantly more abundant in responder birds. In broiler chickens, coadministration of the live vaccine with A. mobilis or Lactobacillus reuteri, a commonly used probiotic, resulted in increased vaccine efficacy, antibody responses, and weight gain. To investigate whether the responder-nonresponder effect was due to the selection of a C. jejuni "supercolonizer mutant" with altered phase-variable genes, we analyzed all poly(G)-containing loci of the input strain compared to nonresponder colony isolates and found no evidence of phase state selection. However, untargeted nuclear magnetic resonance (NMR)-based metabolomics identified a potential biomarker negatively correlated with C. jejuni colonization levels that is possibly linked to increased microbial diversity in this subgroup. The comprehensive methods used to examine the bimodality of the vaccine response provide several opportunities to improve the C. jejuni vaccine and the efficacy of any vaccination strategy.IMPORTANCE Campylobacter jejuni is a common cause of human diarrheal disease worldwide and is listed by the World Health Organization as a high-priority pathogen. C. jejuni infection typically occurs through the ingestion of contaminated chicken meat, so many efforts are targeted at reducing C. jejuni levels at the source. We previously developed a vaccine that reduces C. jejuni levels in egg-laying chickens. In this study, we improved vaccine performance in meat birds by supplementing the vaccine with probiotics. In addition, we demonstrated that C. jejuni colonization levels in chickens are negatively correlated with the abundance of clostridia, another group of common gut microbes. We describe new methods for vaccine optimization that will assist in improving the C. jejuni vaccine and other vaccines under development.
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