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Mahdy OA, Abdel-Maogood SZ, Abdelsalam M, Salem MA. A multidisciplinary study on Clinostomum infections in Nile tilapia: micro-morphology, oxidative stress, immunology, and histopathology. BMC Vet Res 2024; 20:60. [PMID: 38378547 PMCID: PMC10877748 DOI: 10.1186/s12917-024-03901-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 01/28/2024] [Indexed: 02/22/2024] Open
Abstract
Yellow grub disease, caused by Clinostomum metacercaria, is an endemic zoonotic infection in freshwater fish, responsible for Halzoun syndrome transmitted through the consumption of raw infected fish. This study aimed to conduct a multidisciplinary investigation integrating detailed morphology, oxidative stress, immunology, and histopathology alteration to advance our understanding of Clinostomum infection. In this annual study, 400 Nile tilapia (Oreochromis niloticus) were collected from the Nile River at Al Bahr Al Aazam, Giza Governorate to assess Clinostomum infection prevalence. Of the examined fish, 160 individuals (40.0%) harboured larval Clinostomum infections. Clinostomum metacercariae were observed in various anatomical locations, with 135 fish (33.8%) in buccal cavities, 21 fish (5.25%) in gill chambers, and 4 fish (1.0%) on the skin. Infection intensity ranged from 2 to 12 cysts per fish, averaging 5 cysts, notably with skin infections characterized by a single cyst in each fish. Macroscopic encysted metacercariae were collected from buccal cavities, gills, and skin. Micro-morphology revealed distinct features in C. complanatum, including an elliptical oral sucker with collar-like rings and large sensory papilla-like structures, contrasting with the absence of these features in C. phalacrocoracis. Oxidative stress, assessed through malondialdehyde (MDA) and nitric oxide levels, revealed an elevation in MDA to 35.13 ± 6 nmol/g and nitric oxide to 25.80 ± 3.12 µmol/g in infected fish. In infected fish, MHC-I gene expression increased approximately 13-fold, MHC-II peaked at 19-fold, and IL-1β significantly upregulated by 17-fold, compared to control levels. Histopathology detailed associated lesions, such as cyst encapsulation and eosinophilic infiltration. Clinstomiasis and its impacts on fish hosts offer crucial insights to control this emerging fish-borne zoonotic disease, threatening wildlife, aquaculture, and human health.
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Affiliation(s)
- Olfat A Mahdy
- Department of Parasitology, Faculty of Veterinary Medicine, Cairo University, PO 11221, Giza, Egypt.
| | - Sahar Z Abdel-Maogood
- Department of Parasitology, Faculty of Veterinary Medicine, Cairo University, PO 11221, Giza, Egypt
| | - Mohamed Abdelsalam
- Department of Aquatic Animal Medicine and Management, Faculty of Veterinary Medicine, Cairo University, PO 11221, Giza, Egypt.
| | - Mai A Salem
- Department of Parasitology, Faculty of Veterinary Medicine, Cairo University, PO 11221, Giza, Egypt
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El Gamal SA, Adawy RS, Zaki VH, Zahran E. Host-pathogen interaction unveiled by immune, oxidative stress, and cytokine expression analysis to experimental Saprolegnia parasitica infection in Nile tilapia. Sci Rep 2023; 13:9888. [PMID: 37337042 PMCID: PMC10279727 DOI: 10.1038/s41598-023-36892-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 06/12/2023] [Indexed: 06/21/2023] Open
Abstract
The present study evaluated the pathogenicity, immunological, and oxidant/antioxidant responses against Saprolegnia parasitica (S. parasitica) infection in Nile tilapia (Oreochromis niloticus). Three groups of Nile tilapia were assigned as the control group (no zoospores exposure). The other two groups were challenged by Saprolegnia zoospores; one was used for sampling, and the other for mortality monitoring. The study lasted 3 weeks and was sampled at three point times at 1, 2, and 3 weeks. Results showed that S. parasitica zoospores were pathogenic to Nile tilapia, causing a cumulative mortality rate of 86.6%. Immunoglobulin M and C- reactive protein (IgM and CRP) levels showed a similar trend being significantly (P < 0.05, P < 0.001) higher in the infected group at weeks 1, 2, and 3, respectively, compared to the control group. Oxidant and antioxidant parameters in gills revealed that Malondialdehyde (MDA) level was significantly higher in the infected group compared to the control group. While catalase, glutathione peroxidase, and superoxide dismutase (CAT, GSH, and SOD) levels were significantly decreased in the infected group compared to the control group. Compared to the control, the tumor necrosis factor-α (TNF-α) gene was firmly upregulated in gill tissue at all-time points, particularly at day 14 post-infection. Meanwhile, Interleukin 1-β (IL-1 β) gene was significantly upregulated only at days 7 and 14 post-infection compared to control. Histopathological examination revealed destructive and degenerative changes in both skin and gills of experimentally infected Nile tilapia. Our findings suggest that Nile tilapia-S. parasitica infection model was successful in better understanding of pathogenicity and host (fish)-pathogen (oomycete) interactions, where the induced oxidative stress and upregulation of particular immune biomarkers in response to S. parasitica infection may play a crucial role in fish defense against oomycetes in fish.
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Affiliation(s)
- Samar A El Gamal
- Department of Aquatic Animal Medicine, Faculty of Veterinary Medicine, Mansoura University, Mansoura, 35516, Egypt
- Department of Fish Diseases, Animal Health Research Institute (AHRI), Mansoura branch, Agriculture Research Center (ARC), Giza , Egypt
| | - Rawia Saad Adawy
- Department of Fish Diseases, Animal Health Research Institute (AHRI), Mansoura branch, Agriculture Research Center (ARC), Giza , Egypt
| | - Viola Hassan Zaki
- Department of Aquatic Animal Medicine, Faculty of Veterinary Medicine, Mansoura University, Mansoura, 35516, Egypt
| | - Eman Zahran
- Department of Aquatic Animal Medicine, Faculty of Veterinary Medicine, Mansoura University, Mansoura, 35516, Egypt.
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Costantini D. A meta-analysis of impacts of immune response and infection on oxidative status in vertebrates. CONSERVATION PHYSIOLOGY 2022; 10:coac018. [PMID: 35492421 PMCID: PMC9040321 DOI: 10.1093/conphys/coac018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/24/2022] [Accepted: 03/11/2022] [Indexed: 05/06/2023]
Abstract
Inferring from patterns observed in biomedical research, ecoimmunological theory predicts that oxidative stress is a ubiquitous physiological cost that contributes to generating variation in immune function between individuals or species. This prediction is, however, often challenged by empirical studies testing the relationship between immune response or infection and oxidative status markers. This points out the importance of combining ecological immunology and oxidative stress ecology to further our understanding of the proximate causes and fitness consequences of individual variation in health, and adaptability to natural and anthropogenic environmental changes. I reviewed evidence and performed phylogenetic meta-analyses of changes in oxidative status markers owing to either injection of an antigen or infection in captive and free-living vertebrates (141 studies, 1262 effect sizes, 97 species). The dataset was dominated by studies on fish, birds and mammals, which provided 95.8% of effect sizes. Both antigen injection and parasite exposure were associated with changes of oxidative status. There were significant effects of taxonomic class and experimental environment (captivity vs. wild). In contrast with my predictions, age category (young vs. adult), study design (correlational vs. experimental) and proxies of pace of life (clutch size, litter size, and body mass; for birds and mammals only) were negligible in this dataset. Several methodological aspects (type of immunostimulant, laboratory assay, tissue analysed) showed significant effects on both strength and direction of effect. My results suggest that alterations of oxidative status are a widespread consequence of immune function across vertebrates. However, this work also identified heterogeneity in strength and direction of effect sizes, which suggests that immune function does not necessarily result in oxidative stress. Finally, this work identifies methodological caveats that might be relevant for the interpretation and comparability of results and for the application in conservation programs.
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Affiliation(s)
- David Costantini
- Unité Physiologie Moléculaire et Adaptation, UMR 7221, Muséum National d’Histoire Naturelle, CNRS, CP32, 57 rue Cuvier 75005 Paris, France
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Zhang YZ, Han QD, Fu LW, Wang YX, Sui ZH, Liu YG. Molecular identification and phylogenetic analysis of fungal pathogens isolated from diseased fish in Xinjiang, China. JOURNAL OF FISH BIOLOGY 2021; 99:1887-1898. [PMID: 34472096 DOI: 10.1111/jfb.14893] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 08/06/2021] [Accepted: 08/26/2021] [Indexed: 06/13/2023]
Abstract
The outbreaks of fungal diseases in cultured fish have been severe in recent years, which is harmful to the healthy and sustainable development of fish farming. In this study, an investigation was conducted for significant fungal infections of 12 species of fish in four regions in Xinjiang, China, to understand the distribution of local fish fungal pathogens. Twenty-six fungal strains with pathogenicity were isolated, and the challenge experiment showed that eight strains from Changji area had high infection rate to fish eggs. Based on internal transcribed spacer sequence data and molecular analysis, the 26 strains were classified into nine different species of six fungal genera. Phylogenetic analysis showed that all strains were divided into two clades, namely Cluster 1 (contains only the genus Mucor) and Cluster 2 (consists of five small branches), and the distribution of strains from the same region was scattered in two clusters. There is no strict host selectivity for these fungi to infect fish. Mucor sp. are the main fungal pathogen of fish in these four regions, whereas Hypophthalmichthys molitrix and Carassius auratus are two types of fish that were susceptible to pathogen. In addition, the environmental adaptability experiments showed that eight highly pathogenic strains have different adaptability to the environment, and their optimum temperature and pH were 25°C and 7.0, respectively, whereas the concentration of NaCl was negatively correlated with the growth of strains. Therefore, these results indicated that the coinfection of multiple fungal pathogens in a culture region should be considered in the future study.
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Affiliation(s)
- Yan-Zhen Zhang
- College of Life Sciences, Linyi University, Linyi, China
- College of Life Sciences and Technology, Xinjiang University, Urumqi, China
| | - Qing-Dian Han
- College of Life Sciences, Linyi University, Linyi, China
| | - Long-Wei Fu
- College of Life Sciences, Linyi University, Linyi, China
- College of Life Sciences and Technology, Xinjiang University, Urumqi, China
| | - Yong-Xing Wang
- College of Life Sciences and Technology, Xinjiang University, Urumqi, China
| | - Zhi-Hai Sui
- College of Life Sciences, Linyi University, Linyi, China
| | - Yun-Guo Liu
- College of Life Sciences, Linyi University, Linyi, China
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Effects of Dietary Bovine Lactoferrin on Growth Performance and Immuno-physiological Responses of Asian Sea Bass (Lates calcarifer) Fingerlings. Probiotics Antimicrob Proteins 2021; 13:1790-1797. [PMID: 34033064 DOI: 10.1007/s12602-021-09805-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2021] [Indexed: 01/24/2023]
Abstract
The aim of this study was to evaluate the effects of lactoferrin (Lf) on growth and feeding performance, biochemical and immune parameters in Asian sea bass (Lates calcarifer). A basal diet was supplemented with 0 (control), 400 (400 Lf), or 800 (800 Lf) mg Lf kg-1 diet. The results indicate a significant increase in innate immune parameters when the diet was supplemented with 800 mg Lf kg-1. The highest serum albumin value and the lowest serum glucose concentration were observed in 800 Lf group. The liver catalase activity in the 400 Lf and 800 Lf groups was lower than the control value. Moreover, malondialdehyde concentration in the liver of Asian sea bass was increased with increasing the dietary Lf supplementation. The results of the study suggest that supplementing diet with 800 mg Lf kg-1 stimulates non-specific immune response in Asian sea bass. Nonetheless, selecting an appropriate dose can be difficult, especially since both the higher and the lower dose tested may result in adverse effects.
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Magray AR, Hafeez S, Ganai BA, Lone SA, Dar GJ, Ahmad F, Siriyappagouder P. Study on pathogenicity and characterization of disease causing fungal community associated with cultured fish of Kashmir valley, India. Microb Pathog 2021; 151:104715. [PMID: 33444698 DOI: 10.1016/j.micpath.2020.104715] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 12/19/2020] [Accepted: 12/21/2020] [Indexed: 01/21/2023]
Abstract
Cultured fisheries of developing countries are continously challenged by a number of pathogenic microbes. Among microbial diseases, fungal and fungal like pathogen outbreaks lead to negative social and economic impacts on stakeholders. The cultured fisheries of Kashmir valley are also facing challenge from fungal pathogens, leading to tremendous socio-economic lossess to the fish farmer community hence, yearns to boost the sector with efficient management strategy. Our study was aimed at investigating the diversity of fungal communities infecting cultured rainbow trout and carp fish species. We employed classical microbiology, macro and micro morphological characteristics, and molecular analysis (multilocus typing) for fungal identification. Also histopathological approach was used to examine the pathogenicity patterns of diverse fungal groups. The study revealed that the infection in fish was predisposed to both superficial as well as visceral organs. However, skin, gills and head were predominantly infected compared to internal organs. The microbiological investigation of infected fish by culture dependent approach helped us to obtain the total of 250 fungal isolates. Out of these isolates, 21 different species were identified belonging to three diverse fungal groups which mostly included 14 species among Ascomycetes, 03 species of Oomycetes and 04 species of Zygomycetes. The majority of fungi which were infectious to cultured fish of valley are biotrophic or opportunistic soil fungi, and some of them being exclusive pathogens of fish.
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Affiliation(s)
- Aqib Rehman Magray
- Centre of Research for Development, University of Kashmir, Srinagar, 190006, India.
| | - Sabira Hafeez
- Centre of Research for Development, University of Kashmir, Srinagar, 190006, India; Department of Environmental Science, University of Kashmir, Srinagar, 190006, India
| | - Bashir Ahmad Ganai
- Centre of Research for Development, University of Kashmir, Srinagar, 190006, India; Department of Environmental Science, University of Kashmir, Srinagar, 190006, India.
| | - Showkat Ahmad Lone
- Centre of Research for Development, University of Kashmir, Srinagar, 190006, India
| | - Gulam Jeelani Dar
- Centre of Research for Development, University of Kashmir, Srinagar, 190006, India
| | - Fayaz Ahmad
- Department of Environmental Science, University of Kashmir, Srinagar, 190006, India; Department of Zoology, University of Kashmir, Srinagar, 190006, India
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Řehulka J, Kubátová A, Hubka V. Swim bladder mycosis in farmed rainbow trout Oncorhynchus mykiss caused by Phoma herbarum and experimental verification of pathogenicity. DISEASES OF AQUATIC ORGANISMS 2020; 138:237-246. [PMID: 32270764 DOI: 10.3354/dao03464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this study, spontaneous swim bladder mycosis was documented in a farmed fingerling rainbow trout from a raceway culture system. At necropsy, the gross lesions included a thickened swim bladder wall, and the posterior portion of the swim bladder was enlarged due to massive hyperplasia of muscle. A microscopic wet mount examination of the swim bladder contents revealed abundant septate hyphae, and histopathological examination showed periodic acid-Schiff-positive mycelia in the lumen and wall of the swim bladder. Histopathological examination of the thickened posterior swim bladder revealed muscle hyperplasia with expansion by inflammatory cells. The causative agent was identified as Phoma herbarum through morphological analysis and DNA sequencing. The disease was reproduced in rainbow trout fingerlings using intraperitoneal injection of a spore suspension. Necropsy in dead and moribund fish revealed extensive congestion and haemorrhages in the serosa of visceral organs and in liver and abdominal serosanguinous fluid. Histopathological examination showed severe hepatic congestion, sinusoidal dilatation, Kupffer cell reactivity, leukostasis and degenerative changes. Fungi were disseminated to the liver, pyloric caeca, kidney, spleen and heart. Although infections caused by Phoma spp. have been repeatedly reported in fish, species identification has been hampered by extensive taxonomic changes. The results of this study confirmed the pathogenicity of P. herbarum in salmonids by using a reliably identified strain during experimental fish infection and provides new knowledge regarding the course of infection.
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Affiliation(s)
- J Řehulka
- Department of Zoology, Silesian Museum, 746 01 Opava, Czech Republic
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8
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de Sales-Ribeiro C, Sanchez-Henao A, García-Álvarez N, Real F, Rivero MA, Fernández A, Caballero MJ. First description of spontaneous granulomatous aerocystitis by Phoma herbarum in a wild greater amberjack (Seriola dumerili Risso, 1810). JOURNAL OF FISH DISEASES 2019; 42:1321-1325. [PMID: 31197853 DOI: 10.1111/jfd.13045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/18/2019] [Accepted: 05/21/2019] [Indexed: 06/09/2023]
Affiliation(s)
- Carolina de Sales-Ribeiro
- Fish Pathology Unit, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
- Division of Histology and Animal Pathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - Andres Sanchez-Henao
- Division of Infectious Diseases and Ichthiopathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - Natalia García-Álvarez
- Division of Infectious Diseases and Ichthiopathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - Fernando Real
- Division of Infectious Diseases and Ichthiopathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - Miguel A Rivero
- Division of Histology and Animal Pathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - Antonio Fernández
- Division of Histology and Animal Pathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
| | - María José Caballero
- Fish Pathology Unit, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
- Division of Histology and Animal Pathology, Veterinary School, Institute for Animal Health and Food Safety (IUSA), University of Las Palmas de Gran Canaria, Arucas, Spain
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9
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Zahran E, Hafez EE, Mohd Altaf Hossain F, Elhadidy M, Shaheen AA. Saprolegniosis in Nile Tilapia: Identification, Molecular Characterization, and Phylogenetic Analysis of Two Novel Pathogenic Saprolegnia Strains. JOURNAL OF AQUATIC ANIMAL HEALTH 2017; 29:43-49. [PMID: 28166463 DOI: 10.1080/08997659.2016.1259691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Saprolegniosis is a fungal infection that leads to huge economic losses in tilapia aquaculture. Saprolegnia spp. are usually implicated as the etiological agents, but their identification is sometimes troublesome and confusing. In this study, two Saprolegnia strains (ManS22 and ManS33) were isolated from Nile Tilapia Oreochromis niloticus suffering from saprolegniosis. Both isolates were characterized morphologically and from internal transcribed spacer (ITS) sequence data. Additionally, both strains were tested for pathogenicity, and they were highly pathogenic and caused cumulative mortalities of 88.9% and 95.6%, respectively. Initially, the two strains were identified, by morphology of sexual and asexual stages, as members of the genus Saprolegnia. For more definitive identification and characterization, the ITS region of the ribosomal RNA genes was amplified and sequenced, and sequences were compared with other known sequences in GenBank. A phylogenetic tree constructed using the neighbor-joining method revealed that the two strains fell into two clusters within the species Saprolegnia parasitica. Cluster 1 included the ManS33 strain and cluster 2 the ManS22 strain. Cluster 1 grouped the ManS33 strain with other S. parasitica stains and shared 97-99% sequence similarity. Cluster 2 contained only the ManS22 strain and shared 93-94% similarity to several reference sequences of S. parasitica strains. Therefore, our findings suggest that ManS22 represents a newly described strain of S. parasitica. Received April 19, 2016; accepted October 27, 2016.
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Affiliation(s)
- Eman Zahran
- a Department of Internal Medicine, Infections and Fish Diseases, Faculty of Veterinary Medicine , Mansoura University , Mansoura 35516 , Egypt
| | - Elsayed E Hafez
- b Department of Plant Protection and Biomolecular Diagnosis , Arid Lands Cultivation Research Institute, Mubarak City for Scientific Research and Technology Applications , New Borg El Arab City , Alexandria 21934 , Egypt
| | | | - Mohamed Elhadidy
- d Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine , Mansoura University , Mansoura 35516 , Egypt
| | - Adel A Shaheen
- e Department of Fish Diseases and Management, Faculty of Veterinary Medicine , Benha University , Toukh 13736 , Egypt
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Zahran E, Manning B, Seo JK, Noga EJ. The effect of Ochratoxin A on antimicrobial polypeptide expression and resistance to water mold infection in channel catfish (Ictalurus punctatus). FISH & SHELLFISH IMMUNOLOGY 2016; 57:60-67. [PMID: 27539704 DOI: 10.1016/j.fsi.2016.08.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/08/2016] [Accepted: 08/13/2016] [Indexed: 06/06/2023]
Abstract
Mycotoxin contamination of agricultural commodities poses a serious risk to animal health, including aquaculture species. Ochratoxin A (OA) is the most immunotoxic ochratoxin, yet little is known about its effect on immune function in fish. Antimicrobial polypeptides (AMPPs) are one of the most potent, innate, host defense factors, yet very little is known about what types of chronic stressors affect their expression. Among the most prevalent and potent AMPPs in fish are histone-like proteins (HLPs). In this study, fish were fed 2, 4, or 8 mg OA/kg diet. Skin antibacterial activity and HLP-1 levels were measured on Days 0, 28 and 56. Feeding 2, 4 or 8 mg OA/kg diet resulted in significant growth depression, but higher levels (4 or 8 mg OA/kg diet) resulted in lowering feed intake (FI) and impaired feed conversion ratio. In addition, feeding 8 mg OA/kg diet increased susceptibility to experimental water mold (Saprolegnia) challenge, suggesting that OA toxicity might contribute to some saprolegnosis outbreaks. However, there were no changes in AMPP expression in any treatment group. Our data suggests that the increased disease susceptibility of channel catfish due to OA is probably due to mechanisms other than a direct effect on antimicrobial polypeptide expression.
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Affiliation(s)
- Eman Zahran
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA, 27606.
| | - Bruce Manning
- National Warmwater Aquaculture Center, Mississippi State University, Stoneville, MS, 38776, USA
| | - Jung-Kil Seo
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA, 27606
| | - Edward J Noga
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA, 27606
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Cutuli M, Gibello A, Rodriguez-Bertos A, Blanco MM, Villarroel M, Giraldo A, Guarro J. Skin and subcutaneous mycoses in tilapia (Oreochromis niloticus) caused by Fusarium oxysporum in coinfection with Aeromonas hydrophila. Med Mycol Case Rep 2015; 9:7-11. [PMID: 26155462 PMCID: PMC4491647 DOI: 10.1016/j.mmcr.2015.06.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 06/04/2015] [Accepted: 06/05/2015] [Indexed: 01/30/2023] Open
Abstract
Subcutaneous mycoses in freshwater fish are rare infections usually caused by oomycetes of the genus Saprolegnia and some filamentous fungi. To date, Fusarium infections in farmed fish have only been described in marine fish. Here, we report the presence of Fusarium oxysporum in subcutaneous lesions of Nile tilapia (Oreochromis niloticus). Histopathologic evaluation revealed granuloma formation with fungal structures, and the identity of the etiological agent was demonstrated by morphological and molecular analyses. Some of the animals died as a result of systemic coinfection with Aeromonas hydrophila.
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Affiliation(s)
- M. Teresa Cutuli
- Department of Animal Health, Faculty of Veterinary Sciences, Complutense University, Madrid 28040, Spain
| | - Alicia Gibello
- Department of Animal Health, Faculty of Veterinary Sciences, Complutense University, Madrid 28040, Spain
| | - Antonio Rodriguez-Bertos
- Department of Internal Medicine and Animal Surgery, Faculty of Veterinary Sciences, Complutense University, Madrid 28040, Spain
| | - M. Mar Blanco
- Department of Animal Health, Faculty of Veterinary Sciences, Complutense University, Madrid 28040, Spain
| | - Morris Villarroel
- Department of Animal Science, E.T.S.I.A. Polytechnic University of Madrid, Madrid 28040, Spain
| | - Alejandra Giraldo
- Mycology Unit, School of Medicine and Health Sciences, Institut d’Investigació Sanitària Pere Virgili, Universitat Rovira i Virgili, Reus 43201, Spain
| | - Josep Guarro
- Mycology Unit, School of Medicine and Health Sciences, Institut d’Investigació Sanitària Pere Virgili, Universitat Rovira i Virgili, Reus 43201, Spain
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12
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Gozlan RE, Marshall WL, Lilje O, Jessop CN, Gleason FH, Andreou D. Current ecological understanding of fungal-like pathogens of fish: what lies beneath? Front Microbiol 2014. [PMID: 24600442 DOI: 10.3389/fmicb.2014.00062/bibtex] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Despite increasingly sophisticated microbiological techniques, and long after the first discovery of microbes, basic knowledge is still lacking to fully appreciate the ecological importance of microbial parasites in fish. This is likely due to the nature of their habitats as many species of fish suffer from living beneath turbid water away from easy recording. However, fishes represent key ecosystem services for millions of people around the world and the absence of a functional ecological understanding of viruses, prokaryotes, and small eukaryotes in the maintenance of fish populations and of their diversity represents an inherent barrier to aquatic conservation and food security. Among recent emerging infectious diseases responsible for severe population declines in plant and animal taxa, fungal and fungal-like microbes have emerged as significant contributors. Here, we review the current knowledge gaps of fungal and fungal-like parasites and pathogens in fish and put them into an ecological perspective with direct implications for the monitoring of fungal fish pathogens in the wild, their phylogeography as well as their associated ecological impact on fish populations. With increasing fish movement around the world for farming, releases into the wild for sport fishing and human-driven habitat changes, it is expected, along with improved environmental monitoring of fungal and fungal-like infections, that the full extent of the impact of these pathogens on wild fish populations will soon emerge as a major threat to freshwater biodiversity.
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Affiliation(s)
- Rodolphe E Gozlan
- Unité Mixte de Recherche Biologie des Organismes et Écosystèmes Aquatiques (IRD 207, CNRS 7208, MNHN, UPMC), Muséum National d'Histoire Naturelle Paris Cedex, France ; Centre for Conservation Ecology and Environmental Sciences, School of Applied Sciences, Bournemouth University Poole, Dorset, UK
| | - Wyth L Marshall
- BC Centre for Aquatic Health Sciences Campbell River, BC, Canada
| | - Osu Lilje
- School of Biological Sciences, University of Sydney Sydney, NSW, Australia
| | - Casey N Jessop
- School of Biological Sciences, University of Sydney Sydney, NSW, Australia
| | - Frank H Gleason
- School of Biological Sciences, University of Sydney Sydney, NSW, Australia
| | - Demetra Andreou
- Centre for Conservation Ecology and Environmental Sciences, School of Applied Sciences, Bournemouth University Poole, Dorset, UK
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Gozlan RE, Marshall WL, Lilje O, Jessop CN, Gleason FH, Andreou D. Current ecological understanding of fungal-like pathogens of fish: what lies beneath? Front Microbiol 2014; 5:62. [PMID: 24600442 PMCID: PMC3928546 DOI: 10.3389/fmicb.2014.00062] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 01/30/2014] [Indexed: 11/13/2022] Open
Abstract
Despite increasingly sophisticated microbiological techniques, and long after the first discovery of microbes, basic knowledge is still lacking to fully appreciate the ecological importance of microbial parasites in fish. This is likely due to the nature of their habitats as many species of fish suffer from living beneath turbid water away from easy recording. However, fishes represent key ecosystem services for millions of people around the world and the absence of a functional ecological understanding of viruses, prokaryotes, and small eukaryotes in the maintenance of fish populations and of their diversity represents an inherent barrier to aquatic conservation and food security. Among recent emerging infectious diseases responsible for severe population declines in plant and animal taxa, fungal and fungal-like microbes have emerged as significant contributors. Here, we review the current knowledge gaps of fungal and fungal-like parasites and pathogens in fish and put them into an ecological perspective with direct implications for the monitoring of fungal fish pathogens in the wild, their phylogeography as well as their associated ecological impact on fish populations. With increasing fish movement around the world for farming, releases into the wild for sport fishing and human-driven habitat changes, it is expected, along with improved environmental monitoring of fungal and fungal-like infections, that the full extent of the impact of these pathogens on wild fish populations will soon emerge as a major threat to freshwater biodiversity.
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Affiliation(s)
- Rodolphe E. Gozlan
- Unité Mixte de Recherche Biologie des Organismes et Écosystèmes Aquatiques (IRD 207, CNRS 7208, MNHN, UPMC), Muséum National d'Histoire NaturelleParis Cedex, France
- Centre for Conservation Ecology and Environmental Sciences, School of Applied Sciences, Bournemouth UniversityPoole, Dorset, UK
| | | | - Osu Lilje
- School of Biological Sciences, University of SydneySydney, NSW, Australia
| | - Casey N. Jessop
- School of Biological Sciences, University of SydneySydney, NSW, Australia
| | - Frank H. Gleason
- School of Biological Sciences, University of SydneySydney, NSW, Australia
| | - Demetra Andreou
- Centre for Conservation Ecology and Environmental Sciences, School of Applied Sciences, Bournemouth UniversityPoole, Dorset, UK
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