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Feng J, Yuan X, Liu S, Liu X, Cui W, Feng S, Zhang J. Effects of dietary Lactococcus lactis Z-2 on growth, host health and resistance to Aeromonas hydrophila in juvenile common carp (Cyprinus carpio L.). JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2025. [PMID: 39831325 DOI: 10.1002/jsfa.14136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2024] [Revised: 11/24/2024] [Accepted: 01/07/2025] [Indexed: 01/22/2025]
Abstract
BACKGROUND Lactococcus lactis Z-2 was previously isolated from common carp intestine. In order to investigate the effects of optimal dose of L. lactis Z-2 on growth, host health and disease resistance to Aeromonas hydrophila in common carp, five experimental diets, including without (CK and CK+ groups) or with 5 × 107 (group A), 5 × 108 (group B) and 5 × 109 CFU g-1 (group C) L. lactis Z-2, were evaluated for 8 weeks. RESULTS Supplementation of L. lactis Z-2 increased final weights, weight gain, specific growth rate, condition factor and muscle crude protein content, while feed conversion ratio, muscle crude lipid and ash contents were lower than in the CK group (P < 0.05). Furthermore, L. lactis Z-2 also promoted intestinal digestive enzyme (lipase, amylase, protease) activities, improved intestinal morphology and upregulated gene (ZO-1, Occludin, Claudin) expression of intestinal barrier; stimulated secretion of proinflammatory (IL-6, IL-1β, TNF-α) and anti-inflammatory cytokines (TGF-β, IL-10) in serum; and boosted AKP, ACP, LZM and antioxidant enzyme (T-AOC, GSH-Px, T-SOD, CAT) activities of hepatopancreas (P < 0.05). Among them, the effect of group B was more prominent. After A. hydrophila infection, the CK+ group showed overexpression of immune indicators and decreased antioxidant capacity. Whereas dietary intervention with L. lactis Z-2 significantly reversed these changes. Moreover, the survival rate was significantly higher (100%) in group B than in the CK+ group (36.36%) after A. hydrophila infection (P < 0.05). CONCLUSION Dietary L. lactis Z-2 improved the growth performance, immune response, antioxidant capacity, intestinal health and disease resistance of juvenile common carp. Ultimately, 5 × 108 CFU g-1 dietary L lactis Z-2 is recommended for the formulation of feed. © 2025 Society of Chemical Industry.
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Affiliation(s)
- Junchang Feng
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Xiao Yuan
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Shasha Liu
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Xiaobei Liu
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Wenshan Cui
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Shikun Feng
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
| | - Jianxin Zhang
- College of Fisheries, Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, China
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Li X, Lin Y, Li W, Cheng Y, Zhang J, Qiu J, Fu Y. Comparative Analysis of mRNA, microRNA of Transcriptome, and Proteomics on CIK Cells Responses to GCRV and Aeromonas hydrophila. Int J Mol Sci 2024; 25:6438. [PMID: 38928143 PMCID: PMC11204273 DOI: 10.3390/ijms25126438] [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: 03/07/2024] [Revised: 06/05/2024] [Accepted: 06/05/2024] [Indexed: 06/28/2024] Open
Abstract
Grass Carp Reovirus (GCRV) and Aeromonas hydrophila (Ah) are the causative agents of haemorrhagic disease in grass carp. This study aimed to investigate the molecular mechanisms and immune responses at the miRNA, mRNA, and protein levels in grass carp kidney cells (CIK) infected by Grass Carp Reovirus (GCRV, NV) and Aeromonas hydrophilus (Bacteria, NB) to gain insight into their pathogenesis. Within 48 h of infection with Grass Carp Reovirus (GCRV), 99 differentially expressed microRNA (DEMs), 2132 differentially expressed genes (DEGs), and 627 differentially expressed proteins (DEPs) were identified by sequencing; a total of 92 DEMs, 3162 DEGs, and 712 DEPs were identified within 48 h of infection with Aeromonas hydrophila. It is worth noting that most of the DEGs in the NV group were primarily involved in cellular processes, while most of the DEGs in the NB group were associated with metabolic pathways based on KEGG enrichment analysis. This study revealed that the mechanism of a grass carp haemorrhage caused by GCRV infection differs from that caused by the Aeromonas hydrophila infection. An important miRNA-mRNA-protein regulatory network was established based on comprehensive transcriptome and proteome analysis. Furthermore, 14 DEGs and 6 DEMs were randomly selected for the verification of RNA/small RNA-seq data by RT-qPCR. Our study not only contributes to the understanding of the pathogenesis of grass carp CIK cells infected with GCRV and Aeromonas hydrophila, but also serves as a significant reference value for other aquatic animal haemorrhagic diseases.
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Affiliation(s)
- Xike Li
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Yue Lin
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Wenjuan Li
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Yuejuan Cheng
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Junling Zhang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Junqiang Qiu
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
| | - Yuanshuai Fu
- Key Laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China; (X.L.); (Y.L.); (W.L.); (Y.C.); (J.Z.)
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
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Rosa IA, Bianchini AE, Bressan CA, Ferrari FT, Ariotti K, Mori NC, Bandeira Junior G, Pinheiro CG, Pavanato MA, Cargnelutti JF, Baldisserotto B, Heinzmann BM. Redox profile of silver catfish challenged with Aeromonas hydrophila and treated with hexane extract of Hesperozygis ringens (Benth.) Epling through immersion bath. AN ACAD BRAS CIENC 2024; 96:e20230188. [PMID: 38597489 DOI: 10.1590/0001-3765202420230188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 12/19/2023] [Indexed: 04/11/2024] Open
Abstract
The growing increase in the fish farming sector has favored the establishment of bacterial outbreaks caused by Aeromonas hydrophila in several species. The hexane extract of Hesperozygis ringens (HEHR) (Lamiaceae) leaves increased the survival rate of silver catfish (Rhamdia quelen) experimentally infected by A. hydrophila. However, it is noteworthy that no reports have been found on the possible mechanisms of action of this extract in infected fish. This study aimed to evaluate the effect of the HEHR, administered through single immersion bath, on lipid peroxidation and antioxidant defenses in muscle and liver tissue of silver catfish challenged with A. hydrophila. The results showed that the oxidative status of silver catfish was altered, although oxidative stress was not triggered during the experiment. HEHR at 30 mg/L (HEHR30) was not characterized as a pro-oxidant agent in the presence of infection, unlike florfenicol and HEHR at 15 mg/L treatments in some cases. In short, HEHR30 provided an important increase in hepatic catalase activity, characterizing one of the possible mechanisms involved in the greater survival of fish experimentally infected by A. hydrophila. Additionally, HEHR30 did not induce lipid peroxidation, nor reduced antioxidant defenses of silver catfish infected or not by A. hydrophila.
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Affiliation(s)
- Isadora A Rosa
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Adriane E Bianchini
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Caroline A Bressan
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Fabíola T Ferrari
- Universidade Federal de Santa Maria, Curso de Farmácia, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Karine Ariotti
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Natacha C Mori
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
- Universidade de Cruz Alta (UNICRUZ), Curso de Farmácia, Rodovia Municipal Jacob Della Mea, s/n, km 5,6, 98020-290 Cruz Alta, RS, Brazil
| | - Guerino Bandeira Junior
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Carlos G Pinheiro
- Programa de Pós-Graduação em Engenharia Florestal, Universidade Federal de Santa Maria, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Maria Amália Pavanato
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
- Universidade Federal de Santa Maria, Departamento de Fisiologia e Farmacologia, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Juliana F Cargnelutti
- Universidade Federal de Santa Maria, Departamento de Medicina Veterinária Preventiva, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Bernardo Baldisserotto
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
- Universidade Federal de Santa Maria, Departamento de Fisiologia e Farmacologia, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
| | - Berta Maria Heinzmann
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria (UFSM), Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
- Universidade Federal de Santa Maria, Curso de Farmácia, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
- Universidade Federal de Santa Maria, Departamento de Farmácia Industrial, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil
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Wang Q, Sun D, Wang D, Ye B, Wang S, Zhou A, Dong Z, Zou J. Effect of dietary koumine on the immune and antioxidant status of carp (Cyprinus carpio) after Aeromonas hydrophila infection. Microb Pathog 2024; 186:106464. [PMID: 38043626 DOI: 10.1016/j.micpath.2023.106464] [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: 09/17/2023] [Revised: 11/20/2023] [Accepted: 11/23/2023] [Indexed: 12/05/2023]
Abstract
Koumine (KM) has anxiolytic, anti-inflammatory and growth-promoting effects in pigs and sheep. Based on the growth-promoting and immunological effects of koumine, the present study was conducted on Cyprinus carpio (C. carpio) with four KM concentrations: 0 mg/kg, 0.2 mg/kg, 2 mg/kg, and 20 mg/kg for 10 weeks, followed by a 1-week Aeromonas hydrophila (A. hydrophila) infection experiment. The effect of KM on the immunity of A. hydrophila infected carp was analyzed by histopathology, biochemical assay, and qRT-PCR to assess the feasibility of KM in aquaculture. The results showed that the presence of KM alleviated pathogen damage to carp tissues. At 2 mg/kg and 20 mg/kg concentrations of KM successively and significantly elevated (p < 0.05) the SOD activities in the intestinal tract, hepatopancreas and kidney of carp. The expression levels of hepatopancreatic antioxidant genes Nrf2 and IGF-1 were significantly up-regulated in the same group (p < 0.05), while the expression levels of immune genes IL-8 and IL-10 were down-regulated. In summary, KM at concentrations of 2 mg/kg and 20 mg/kg could regulate the expression of antioxidant and immune genes in various tissues in an orderly and rapid manner, and significantly improve the antioxidant and immune abilities of carp, which is conducive to the improvement of the resilience of carp.
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Affiliation(s)
- Qiujie Wang
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Di Sun
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Dongjie Wang
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Bin Ye
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Shaodan Wang
- College of Marine Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Aiguo Zhou
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China
| | - Zaijie Dong
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, 214081, China.
| | - Jixing Zou
- Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, China.
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Long-Term Aspartame Administration Leads to Fibrosis, Inflammasome Activation, and Gluconeogenesis Impairment in the Liver of Mice. BIOLOGY 2021; 10:biology10020082. [PMID: 33499218 PMCID: PMC7911935 DOI: 10.3390/biology10020082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND Aspartame is an artificial sweetener used in foods and beverages worldwide. However, it is linked to oxidative stress, inflammation, and liver damage through mechanisms that are not fully elucidated yet. This work aimed to investigate the effects of long-term administration of aspartame on the oxidative and inflammatory mechanisms associated with liver fibrosis progression in mice. METHODS Mice were divided into two groups with six animals each: control and aspartame. Aspartame (80 mg/kg, via oral) or vehicle was administrated for 12 weeks. RESULTS Aspartame caused liver damage and elevated serum transaminase levels. Aspartame also generated liver fibrosis, as evidenced by histology analysis, and pro-fibrotic markers' upregulation, including transforming growth factor β 1, collagen type I alpha 1, and alpha-smooth muscle actin. Furthermore, aspartame reduced nuclear factor erythroid 2-related factor 2 (Nrf2) activation and enzymatic antioxidant activity and increased lipid peroxidation, which triggered NOD-like receptor containing protein 3 (NLRP3) inflammasome activation and p53 induction. Furthermore, aspartame reduced peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1α) levels, possibly through p53 activation. This PGC-1α deficiency could be responsible for the changes in lipid profile in serum, total lipid accumulation, and gluconeogenesis impairment in liver, evidenced by the gluconeogenic enzymes' downregulation, thus causing hypoglycemia. CONCLUSIONS This work provides new insights to understand the mechanisms related to the adverse effects of aspartame on liver tissue.
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Londero ÉP, Bressan CA, Pês TS, Saccol EMH, Baldisserotto B, Finamor IA, Pavanato MA. Rutin-added diet protects silver catfish liver against oxytetracycline-induced oxidative stress and apoptosis. Comp Biochem Physiol C Toxicol Pharmacol 2021; 239:108848. [PMID: 32777463 DOI: 10.1016/j.cbpc.2020.108848] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/30/2020] [Accepted: 07/14/2020] [Indexed: 12/17/2022]
Abstract
It is unknown whether the flavonoid rutin can protect the silver catfish liver in response to exposure to a known stressor, such as the prophylactic usage of the antimicrobial agent oxytetracycline. Thus, the current study aimed to assess the effect of rutin incorporation into the silver catfish diet formulation on oxytetracycline-induced liver oxidative stress and apoptosis. Fish were split into four groups as follows: control, rutin (1.5 g kg diet-1), oxytetracycline (0.1 g kg diet-1) and rutin+oxytetracycline (1.5 g kg diet-1 and 0.1 g kg diet-1, respectively). After two weeks of feeding with the different diets (standard, rutin-, oxytetracycline and rutin+oxytetracycline-added diets), fish were euthanized to collect the liver. Although the rutin-added diet was unable to recover glutathione peroxidase activity, ascorbic acid and reduced glutathione (GSH) levels, which were depleted due to oxytetracycline consumption, it markedly diminished the oxidized glutathione (GSSG) content, thus decreasing the GSSG to GSH ratio, an important index of oxidative stress. It also increased glutathione reductase and markedly augmented glucose-6-phosphate dehydrogenase activities, which were declined after oxytetracycline ingestion. Furthermore, the rutin-added diet reestablished superoxide dismutase and catalase activities and reduced lipid peroxidation, nitric oxide and superoxide anion levels as well, all changes resulting from oxytetracycline consumption. Finally, it also prevented oxytetracycline-induced apoptosis through increasing heat shock protein 70 and markedly decreasing high mobility group box 1 and, consequently, reducing cleaved caspase-3 protein levels. Therefore, in conclusion, the incorporation of this flavonoid to the silver catfish diet protected the liver against oxytetracycline-induced liver oxidative stress and apoptosis.
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Affiliation(s)
- Érika P Londero
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil
| | - Caroline A Bressan
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil
| | - Tanise S Pês
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil
| | - Etiane M H Saccol
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil
| | | | - Isabela A Finamor
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil.
| | - Maria A Pavanato
- Department of Physiology and Pharmacology, Universidade Federal de Santa Maria, Brazil.
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Bandeira Junior G, Baldisserotto B. Fish infections associated with the genus Aeromonas: a review of the effects on oxidative status. J Appl Microbiol 2021; 131:1083-1101. [PMID: 33382188 DOI: 10.1111/jam.14986] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 12/14/2020] [Accepted: 12/27/2020] [Indexed: 01/07/2023]
Abstract
The aim of this review was to summarize the current knowledge regarding the effects of aeromonosis on fish oxidative status. The bibliographic survey was carried out on the research platforms: Scopus and Science Direct. The keywords 'Aeromonas', 'fish' and 'oxidative status' (or 'oxidative stress', 'oxidative damage' and similar terms) were used. Scientific papers and short communications were considered. Studies involving fish aeromonosis and enzymatic or non-enzymatic markers of oxidative status were selected. The results of antioxidant enzymes activities/expressions after infection lack consistency, suggesting that these findings should be interpreted with caution. Most of the analysed studies pointed to an increase in reactive oxygen species, malondialdehyde and protein carbonylation levels, indicating possible oxidative damage caused by the infection. Thus, these three biomarkers are excellent indicators of oxidative stress during infection. Regarding respiratory burst activity, several studies have indicated increased activity, but other studies have indicated unchanged activity after infection. Nitric oxide levels also increased after infection in most studies. Therefore, it is suggested that the fish's immune system tries to fight a bacterial infection by releasing reactive oxygen and nitrogen species.
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Affiliation(s)
- G Bandeira Junior
- Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - B Baldisserotto
- Department of Physiology and Pharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
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