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Liliana PC, Dumitrescu G, McCleery D, Pet I, Iancu T, Stef L, Corcionivoschi N, Balta I. Organic acids mitigate Streptococcus agalactiae virulence in Tilapia fish gut primary cells and in a gut infection model. Ir Vet J 2024; 77:10. [PMID: 38797844 PMCID: PMC11129440 DOI: 10.1186/s13620-024-00272-1] [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: 03/26/2024] [Accepted: 05/07/2024] [Indexed: 05/29/2024] Open
Abstract
BACKGROUND Streptococcus agalactiae, a Gram-positive bacterium, has emerged as an important pathogen for the aquaculture industry worldwide, due to its increased induced mortality rates in cultured fish. Developing interventions to cure or prevent infections based on natural alternatives to antibiotics has become a priority, however, given the absence of scientific evidence regarding their mode of action progress has been slow. METHODS In this study we aimed to investigate the effect of a mixture of organic acids (natural antimicrobials), AuraAqua (Aq), on the virulence of S. agalactiae using Tilapia gut primary epithelial cells and an in vitro Tilapia gut culture model. Our results show that Aq was able to reduce significantly, in vitro, the S. agalactiae levels of infection in Tilapia gut primary epithelial cells (TGP) when the MIC concentration of 0.125% was tested. RESULTS AND DISCUSSION At bacterial level, Aq was able to downregulate bacterial capsule polysaccharide (CPS) gene expression, capC, resulting in a significant decrease in bacterial surface capsule production. The decrease in CPS production was also associated with a reduction in the pro-inflammatory IFNγ, IL1β, TNFα, SOD and CAT gene expression and H2O2 production in the presence of 0.125% Aq (P < 0.0001). The antimicrobial mixture also reduced the levels of S. agalactiae infection in an in vitro gut culture model and significantly reduced the IFNγ, IL1β, TNFα, SOD, CAT gene expression and H2O2 production in infected tissue. Moreover, genes involved in Tilapia resistance to S. agalactiae induced disease, MCP-8 and Duo-1, were also downregulated by Aq, as a consequence of reduced bacterial levels of infection. CONCLUSION Conclusively, our study shows that mixtures of organic acids can be considered as potential alternative treatments to antibiotics and prevent S. agalactiae infection and inflammation in the Tilapia fish digestive tract.
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Affiliation(s)
- Petculescu Ciochina Liliana
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Gabi Dumitrescu
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - David McCleery
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK
| | - Ioan Pet
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Tiberiu Iancu
- Faculty of Management and Rural Development, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Lavinia Stef
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Nicolae Corcionivoschi
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania.
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK.
- Academy of Romanian Scientists, Ilfov Street, No. 3, Bucharest, 050044, Romania.
| | - Igori Balta
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania.
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Leal CAG, Silva BA, Colombo SA. Susceptibility Profile and Epidemiological Cut-Off Values Are Influenced by Serotype in Fish Pathogenic Streptococcus agalactiae. Antibiotics (Basel) 2023; 12:1726. [PMID: 38136760 PMCID: PMC10741021 DOI: 10.3390/antibiotics12121726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 11/30/2023] [Accepted: 12/12/2023] [Indexed: 12/24/2023] Open
Abstract
Streptococcus agalactiae is a major health concern in tilapia farming worldwide. In contrast to the availability of susceptibility profile results, interpretative criteria for disk diffusion assays and the influence of serotypes on resistance profiles are not available. To address this, sixty isolates (thirty of each serotype, Ib and III) were evaluated using the disk diffusion assay against six antibiotics, and the epidemiological cut-off value (ECV) was calculated. All the isolates were classified as non-wild type (NWT) for sulfamethoxazole (SUT) and norfloxacin (NOR). The inhibition zones for oxytetracycline (OXY) and doxycycline (DOX) were largely distinct; all serotype Ib and III isolates were classified as wild-type (WT) and NWT, respectively. The results for serotype III of fish group B Streptococcus (GBS) were comparable to the NWT tetracycline profile of human GBS available in EUCAST, suggesting the presence of resistance mechanisms in these fish isolates. The calculation of the cut-off wild type (COWT) values for OXY and DOX was appropriate for both serotypes. Differences between the distribution of florfenicol (FLO) and amoxicillin (AMO) were found, and we attribute this to the faster growth rate of serotype III, which promotes smaller inhibition zones. Therefore, using separate COWT for each serotype is necessary. In conclusion, the serotype of fish GBS affects its susceptibility profile, and it is recommended to use serotype-specific COWT values as interpretative criteria for disk diffusion assays against FLO and AMO.
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Affiliation(s)
- Carlos Augusto Gomes Leal
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil; (B.A.S.); (S.A.C.)
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Zhao Z, Zou Q, Han S, Shi J, Yan H, Hu D, Yi Y. Omics analysis revealed the possible mechanism of streptococcus disease outbreak in tilapia under high temperature. FISH & SHELLFISH IMMUNOLOGY 2023; 134:108639. [PMID: 36841518 DOI: 10.1016/j.fsi.2023.108639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 02/05/2023] [Accepted: 02/22/2023] [Indexed: 06/18/2023]
Abstract
High temperature is a main cause to result in the outbreak of tilapia streptococcal disease. However, the underlying mechanisms are not well understood. In this study, we first confirmed that tilapia infected with Streptococcus agalactiae (S. agalactiae) had a higher mortality at high temperature (35 °C) than that at normal temperature (28 °C). Subsequently, the effects of high temperature on gene expression pattern of S. agalactiae and intestinal microbiota of tilapia were respectively detected by RNA-seq and 16S rDNA sequencing. RNA-seq identified 357 differentially expressed genes (DEGs) in S. agalactiae cultured at 28 °C and 35 °C. GO and KEGG analysis showed that these DEGs were highly involved in metabolic processes, including glucose, lipid and amino acid metabolisms, which indicates that S. agalactiae have stronger vitality and are likely to be more infectious under high temperature. Microbiota analysis revealed that high temperature could influence the bacterial community composition of tilapia intestine, accompanied by changes in intestinal structure. Compared to feed at 28 °C, the total bacterial species as well as pathogens, such as norank_f__Rhizobiales_Incertae_Sedis, Pseudorhodoplanes, Ancylobacter, in tilapia intestine were significantly increased at 35 °C, which may weaken the immune resistance of tilapia. Taken together, our results suggest that high temperature evoked tilapia susceptible to S. agalactiae should be the combined effect of enhanced S. agalactiae metabolism and dysregulated tilapia intestinal microbiota.
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Affiliation(s)
- Zaoya Zhao
- Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
| | - Qianxing Zou
- Department of Reproductive Medicine, Liuzhou People's Hospital, Liuzhou, 545006, China.
| | - Shuyu Han
- Guangxi Fishery Technical Extension Station, Nanning, 530022, China.
| | - Jingu Shi
- Guangxi Fishery Technical Extension Station, Nanning, 530022, China.
| | - Haijun Yan
- State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Province Key Laboratory for Aquatic Economic Animals, South China Sea Bio-Resource Exploitation and Collaborative Innovation Center, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510006, China.
| | - Dasheng Hu
- Guangxi Fishery Technical Extension Station, Nanning, 530022, China.
| | - Yi Yi
- Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
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Cortez BRDS, Guedes RMC. A review on the evolution of methods for intestinal in vitro organ culture and its application in veterinary science. Vet World 2023; 16:347-356. [PMID: 37042004 PMCID: PMC10082705 DOI: 10.14202/vetworld.2023.347-356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 01/06/2023] [Indexed: 02/25/2023] Open
Abstract
Different techniques have been reported in studies of intestinal in vitro organ culture (IVOC). A robust compilation of all available methods is lacking in the literature, making it difficult to choose a method that corresponds to the study's demands. In this review, readers can assess the most available methods, allowing them to evaluate which is more suitable for their purposes and requirements. A simplified view of culturing intestinal explants is presented, highlighting the approachability of IVOC. Relevant findings from diverse veterinarian studies, where explants played a major role, as well as the technique used in each, are described to illustrate its applications. Finally, the strengths and limitations of the innovative intestinal IVOC methods are discussed. This review provides a collection of methods for intestinal explant culture and their possible applications in veterinary research. In this way, it aims to broaden access to IVOC techniques and aid decision-making regarding the best suited for a study's purposes.
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Affiliation(s)
- Barbara Ribeiro de Souza Cortez
- Department of Veterinary Clinic and Surgery, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil; Department of Large Animal Clinical Sciences, University of Saskatchewan, Saskatoon, Canada
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Chen D, Yang L, Yang F, Pei Q, Lu L, Huang X, Ouyang P, Geng Y, Li Z, Zhang X, Wang J, Chen D. Salvia miltiorrhiza polysaccharide activated macrophages and improved the disease resistance of sturgeon against Aeromonas hydrophila. FISH & SHELLFISH IMMUNOLOGY 2022; 127:594-603. [PMID: 35803508 DOI: 10.1016/j.fsi.2022.06.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 06/23/2022] [Accepted: 06/25/2022] [Indexed: 06/15/2023]
Abstract
The use of plant polysaccharides in aquaculture is recognized as a healthy strategy to enhance disease resistance and reduce medication use. Salvia miltiorrhiza polysaccharide (SMP) can regulate the immune function of higher vertebrates. However, the effects of SMP on fish have not been fully investigated. In this study, the ability of SMP to activate the macrophages of Siberian sturgeon (Acipenser bareii) was analyzed in vitro. The effects of SMP on immune cell activity of hybrid sturgeon (A. baerii ♀ × Acipenser schrenckii ♂) and resistance to Aeromonas hydrophila were further detected in vivo. The in vitro results showed that SMP up-regulated phagocytosis, respiratory burst, inducible nitric oxide synthase activity, nitric oxide (NO) concentration, and cytokine mRNA expression of macrophages. The in vivo results showed that dietary supplementation with SMP enhanced the respiratory burst of macrophages and proliferative activity of lymphocytes. Dietary supplementation with SMP increased serum concentrations of lysozyme and NO, and improved the survival rate of hybrid sturgeon challenged with A. hydrophila. Collectively, these results suggest that SMP can improve the immune function and disease resistance of sturgeon. This study provides a theoretical basis for the application of SMP for healthy farming of sturgeon.
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Affiliation(s)
- Daiyu Chen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Lei Yang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Fei Yang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Qiaolin Pei
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Lu Lu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Xiaoli Huang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Ping Ouyang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Yi Geng
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Zhiqiong Li
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Xin Zhang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China
| | - Jun Wang
- Neijiang Normal University, Neijiang, 641000, Sichuan, PR China
| | - Defang Chen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 610000, Sichuan, PR China.
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Owatari MS, Cardoso L, Pereira SA, Pereira UDP, Tachibana L, Martins ML, Mouriño JLP. Laboratory-controlled challenges of streptococcosis in Nile tilapia using the oral route (infected-feed) for infection. FISH & SHELLFISH IMMUNOLOGY 2022; 120:295-303. [PMID: 34871760 DOI: 10.1016/j.fsi.2021.11.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/26/2021] [Accepted: 11/28/2021] [Indexed: 06/13/2023]
Abstract
The study aimed to evaluate the oral infected-feed, intragastric-gavage, and intraperitoneal routes of the Streptococcus agalactiae infection in Nile tilapia (Oreochromis niloticus). For this purpose, 270 juveniles of Nile tilapia, with an average weight of 2 g, were distributed in 18 experimental units of 90 L, acclimatized, and raised for 55 days, until reaching 50 g (median weight). The experimental design was entirely randomized in six treatments, three of which were composed by bacterial infection routes: intraperitoneal 100 μL fish-1 [108 CFU], intragastric 100 μL fish-1 [108 CFU], feed inoculum 100 μL g feed-1 [109 CFU], and three respective control groups. Clinical signs were observed, and mortalities monitored until reaching 50% in the infected groups. Then, tissue samples from the spleen, liver, intestine, brain, and blood were collected from 20 fish per treatment for histopathological and hemato-immunological analyses. In addition, a related mortality curve was established at the end of the experimental challenge. The intraperitoneal and intragastric routes were more aggressive than the oral inoculum, causing greater brain damage, acute hemato-immunological response, and early mortality. While the orally fed inoculum, fish presented brain lesions with less intensity, and a chronic haemato-immunological response, the mortalities occurred twice as long as the other routes. The present research demonstrated that the S. agalactiae oral (feed inoculum) administration can be an innovative methodology to future experimental challenges in aquaculture research.
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Affiliation(s)
- Marco Shizuo Owatari
- AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil.
| | - Lucas Cardoso
- AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil
| | - Scheila Anelise Pereira
- AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil
| | - Ulisses de Pádua Pereira
- Department of Preventive Veterinary Medicine, Laboratory of Bacteriology in Fish (LABBEP), Universidade Estadual de Londrina, Londrina, Brazil
| | - Leonardo Tachibana
- Fisheries Institute - APTA - SAA, Aquaculture Research Center, Av. Conselheiro Rodrigues Alves, 1252, CEP 04014-900, São Paulo, SP, Brazil
| | - Maurício Laterça Martins
- AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil
| | - José Luiz Pedreira Mouriño
- AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (CCA, UFSC), Rodovia Admar Gonzaga 1346, 88040-900, Florianópolis, SC, Brazil
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Abstract
Explants are three-dimensional tissue fragments maintained outside the organism. The goals of this article are to review the history of fish explant culture and discuss applications of this technique that may assist the modern zebrafish laboratory. Because most zebrafish workers do not have a background in tissue culture, the key variables of this method are deliberately explained in a general way. This is followed by a review of fish-specific explantation approaches, including presurgical husbandry, aseptic dissection technique, choice of media and additives, incubation conditions, viability assays, and imaging studies. Relevant articles since 1970 are organized in a table grouped by organ system. From these, I highlight several recent studies using explant culture to study physiological and embryological processes in teleosts, including circadian rhythms, hormonal regulation, and cardiac development.
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Affiliation(s)
- Elizabeth E. LeClair
- Department of Biological Sciences, College of Science and Health, DePaul University, Chicago, Illinois, USA
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Zhang QL, Li HW, Wu W, Zhang M, Guo J, Deng XY, Wang F, Lin LB. The Response of Microbiota Community to Streptococcus agalactiae Infection in Zebrafish Intestine. Front Microbiol 2019; 10:2848. [PMID: 31866993 PMCID: PMC6908962 DOI: 10.3389/fmicb.2019.02848] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 11/25/2019] [Indexed: 12/15/2022] Open
Abstract
Recently, Streptococcus agalactiae has become a major pathogen leading to Streptococcosis. To understand the physiological responses of zebrafish (Danio rerio) to S. agalactiae, the intestinal microbiota composition of the intestine (12 and 24 h post-infection, hpi, respectively) in zebrafish infected with S. agalactiae were investigated. The intestinal bacterial composition was analyzed using PacBio high-throughput full-length 16S rRNA gene sequencing. The most predominant bacteria in the zebrafish intestine were the Fusobacteria phylum and Sphingomonas genus. S. agalactiae infection affected the composition of partially intestinal microbiota. At the species level, the relative abundance of the pathogenic intestinal bacteria Aeromonas veronii, S. agalactiae, and Clostridium tarantellae significantly increased after S. agalactiae infection (p < 0.05), while that of the beneficial intestinal bacteria Bacillus licheniformis, Comamonas koreensis, and Romboutsia ilealis significantly decreased (p < 0.05), showing that S. agalactiae infection aggravates the zebrafish disease through promoting abundance of other intestinal pathogenic bacteria. This study is the first PacBio analyses of the zebrafish intestinal microbiota community under pathogenic infection. Results suggest that the S. agalactiae infection alters the intestinal flora structure in zebrafish.
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Affiliation(s)
- Qi-Lin Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Hong-Wei Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Wei Wu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Man Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Jun Guo
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Xian-Yu Deng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Feng Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
| | - Lian-Bing Lin
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, China
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