1
|
Gao Y, Tan R, Wang Z, Qiang L, Yao H. The effects of Bacillus subtilis on the immunity, mucosal tissue morphology, immune-related gene transcriptions, and intestinal microbiota in flounder (Paralichthys olivaceus) with two feeding methods: Continuous versus discontinuous feeding. Vet Immunol Immunopathol 2024; 271:110742. [PMID: 38547603 DOI: 10.1016/j.vetimm.2024.110742] [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: 11/29/2023] [Revised: 02/28/2024] [Accepted: 03/12/2024] [Indexed: 04/29/2024]
Abstract
Probiotics as dietary additives can improve weight gain, feed efficiency, and disease resistance in cultured fish. In this research, we evaluated and compared the effects of Bacillus subtilis on immunity, mucosal tissue morphology, immune-related gene transcriptions, and intestinal microbiota in flounder (Paralichthys olivaceus) by a 30-day feeding experiment based on a continuous feeding schedule (E1) and a discontinuous feeding schedule (E2). As a result, the use of B. subtilis exerted the best positive effects on survival rate, enzyme activity, mucosal tissue morphology, immune-related gene transcriptions, and intestinal microbiota in flounders. Alkaline phosphatase (AKP), lysozyme (LZM), and superoxide dismutase (SOD) activities in the liver of E2 were higher than those of E1 (P < 0.05). Furthermore, the villi length in the intestinal tract and the fold length in the stomach of E2 were also higher than in E1 (P < 0.05). The il-1 expression levels in the spleen were significantly increased in E2 (P < 0.05) compared to E1. We performed 16 S rRNA sequencing analysis to find that Bacillus in E1 (1.06%) and E2 (1.01%) had higher relative abundances than in E0 (0.053%) at the end of the experiments, indicating that short-term application of B. subtilis with the continuous or discontinuous feeding method can allow both the adaptation of the ecosystem to the presence of probiotics by the establishment of new species in the gut microbiota and the ability these new probiotic species to perform corresponding functions. No significant differences in the ability of probiotic establishment were observed between E1 and E2. Our findings provided a unique perspective to explore the mechanism of immune enhancement with probiotics and to screen the optimal administration strategy in aquaculture application for probiotic use. Together, these results point to some level of enhancement in immune status by continuous and discontinuous feeding after a short-term feeding period, which could be used as a prophylactic strategy for flounder health management.
Collapse
Affiliation(s)
- Yingli Gao
- Laboratory of Pathology and Immunology of Aquatic Animals, School of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China; Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang 222005, China; Marine Resources Development and Research Institute, Lianyungang 222005, China.
| | - Ruiming Tan
- Laboratory of Pathology and Immunology of Aquatic Animals, School of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China
| | - Zicheng Wang
- Laboratory of Pathology and Immunology of Aquatic Animals, School of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China
| | - Lu Qiang
- Laboratory of Pathology and Immunology of Aquatic Animals, School of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China
| | - Haijing Yao
- Laboratory of Pathology and Immunology of Aquatic Animals, School of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang 222005, China
| |
Collapse
|
2
|
Sayyaf Dezfuli B, Lorenzoni M, Carosi A, Giari L, Bosi G. Teleost innate immunity, an intricate game between immune cells and parasites of fish organs: who wins, who loses. Front Immunol 2023; 14:1250835. [PMID: 37908358 PMCID: PMC10613888 DOI: 10.3389/fimmu.2023.1250835] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/06/2023] [Indexed: 11/02/2023] Open
Abstract
Fish, comprising over 27,000 species, represent the oldest vertebrate group and possess both innate and adaptive immune systems. The susceptibility of most wild fish to parasitic infections and related diseases is well-established. Among all vertebrates, the digestive tract creates a remarkably favorable and nutrient-rich environment, which, in turn, renders it susceptible to microparasites and macroparasites. Consequently, metazoan parasites emerge as important disease agents, impacting both wild and farmed fish and resulting in substantial economic losses. Given their status as pathogenic organisms, these parasites warrant considerable attention. Helminths, a general term encompassing worms, constitute one of the most important groups of metazoan parasites in fish. This group includes various species of platyhelminthes (digeneans, cestodes), nematodes, and acanthocephalans. In addition, myxozoans, microscopic metazoan endoparasites, are found in water-dwelling invertebrates and vertebrate hosts. It is worth noting that several innate immune cells within the fish alimentary canal and certain visceral organs (e.g., liver, spleen, and gonads) play active roles in the immune response against parasites. These immune cells include macrophages, neutrophils, rodlet cells, and mast cells also known as eosinophilic granular cells. At the site of intestinal infection, helminths often impact mucous cells number and alter mucus composition. This paper presents an overview of the state of the art on the occurrence and characteristics of innate immune cells in the digestive tract and other visceral organs in different fish-parasite systems. The data, coming especially from studies employed immunohistochemical, histopathological, and ultrastructural analyses, provide evidence supporting the involvement of teleost innate immune cells in modulating inflammatory responses to metazoan and protozoan parasitic infections.
Collapse
Affiliation(s)
- Bahram Sayyaf Dezfuli
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Massimo Lorenzoni
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - Antonella Carosi
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Perugia, Italy
| | - Luisa Giari
- Department of Environmental and Prevention Sciences, University of Ferrara, Ferrara, Italy
| | - Giampaolo Bosi
- Department of Veterinary Medicine and Animal Science, University of Milan, Lodi, Italy
| |
Collapse
|
3
|
Cohen S, Diaz MV, Díaz AO. Development of the digestive system of Argentine hake, Merluccius hubbsi, larvae. J Morphol 2020; 281:578-590. [PMID: 32271483 DOI: 10.1002/jmor.21122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/19/2020] [Accepted: 03/20/2020] [Indexed: 11/12/2022]
Abstract
The Argentine hake Merluccius hubbsi is an important fishery resource of the Southwestern Atlantic Ocean and it is also a potential species for cultivation. In this work, the digestive system development in field-caught hake larvae was studied using histological and histochemical approaches. The digestive tract of larvae was divided into: oropharyngeal cavity (OPC), esophagus, stomach (that develops in the preflexion stage), and intestine. The annexed digestive glands consisted of the liver and the exocrine pancreas. At the beginning of the preflexion stage, teeth were developed in the OPC. There were mucous cells in the esophagus secreting different glycoconjugates from hatching. The enterocytes in the posterior intestine exhibited supranuclear vesicles associated with protein absorption. Mucous cells were observed in the posterior intestine in the preflexion stage and, in the anterior region, ending the flexion stage. Each type of glycoconjugates has a specific role. Acidic mucins lubricate and protect from mechanical damage, sialomucines protect from bacterial infections and neutral mucins regulate the acidity of mucus secretion, protect against abrasion and participate in the formation of the chyme, indicating a pregastric digestion. The liver was present since hatching with pancreatic tissue inside and increased in size acquiring the typical structure with hepatocyte cords, sinusoids, vacuoles, and hepatic duct. The hepatocytes vacuolization increased with larval development. The pancreas became extra-hepatic, with basophilic acinar cells and acidophilic zymogen granules. Throughout the ontogeny, the increased structural and functional complexity of the digestive system reflected the transition to exogenous feeding and nutritional increasing needs.
Collapse
Affiliation(s)
- Stefania Cohen
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Argentina.,Instituto de Investigaciones Marinas y Costeras (IIMyC), FCEyN, UNMdP-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina
| | - Marina V Diaz
- Instituto de Investigaciones Marinas y Costeras (IIMyC), FCEyN, UNMdP-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina.,Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
| | - Alcira O Díaz
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, Argentina.,Instituto de Investigaciones Marinas y Costeras (IIMyC), FCEyN, UNMdP-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina
| |
Collapse
|
4
|
Miranda V, Cohen S, Díaz AO, Diaz MV. Development of the visual system of anchovy larvae, Engraulis anchoita: A microanatomical description. J Morphol 2020; 281:465-475. [PMID: 32092182 DOI: 10.1002/jmor.21113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 02/03/2020] [Accepted: 02/11/2020] [Indexed: 11/11/2022]
Abstract
During the early ontogeny of fish larvae, the accurate development of the visual system plays a key role, because it is involved in locating food, orientation, selection of favorable habitat, and evasion of predators. The structure of the eye of the fish is typical of vertebrates, with some modifications related to the aquatic environment. In the present work, we describe the development of the larval eye of Engraulis anchoita for the first time. Larvae were collected at the Permanent Station of Environmental Studies (EPEA) in coastal waters of the Southwestern Atlantic Ocean during research cruises in 2015 and 2016. We describe the histology of the retina layers, determine the beginning of the functionality of the eye, and discuss a possible synchronization with the development of the digestive tract. This study provides information about the biology of E. anchoita, the most abundant fish species in the southwestern Atlantic Ocean. Also, recent studies have shown responses of the retina and other tissues to the increase in environmental acidity. Therefore, results of this study are also discussed with respect to the possible effect of acidification on the larvae of this species. The continuity of the time series developed at the EPEA will allow monitoring the effect of long-term environmental and biological variables on the early ontogeny of anchovy in the context of climate change. The high commercial fishing potential of E. anchoita due to its high abundance, as well as its essential role in the trophic web of other commercially valuable fishing resources of Argentina, reinforce the need to continue deepening knowledge about this species. Research highlights: Eyes of Engraulis anchoita larvae are functional from early larval stages. At hatching, the retina is formed by only few layers from which the other layers differentiates during ontogeny. Focal distance increases with larval growth.
Collapse
Affiliation(s)
- Valeria Miranda
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
| | - Stefanía Cohen
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina.,Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina
| | - Alcira O Díaz
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina.,Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina
| | - Marina V Diaz
- Laboratorio de Histología e Histoquímica, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina.,Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mar del Plata, Argentina.,Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
| |
Collapse
|
5
|
Bosi G, DePasquale JA, Rossetti E, Dezfuli BS. Differential mucins secretion by intestinal mucous cells of Chelon ramada in response to an enteric helminth Neoechinorhynchus agilis (Acanthocephala). Acta Histochem 2020; 122:151488. [PMID: 31862187 DOI: 10.1016/j.acthis.2019.151488] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 11/21/2019] [Accepted: 12/02/2019] [Indexed: 01/11/2023]
Abstract
Intestinal mucous cells produce and secrete mucins which hydrate, lubricate and protect the intestinal epithelium from mechanical injuries due to the transition of digesta or action of pathogens. Intestinal mucous cells are considered elements of the innate immune system as they secrete lectins, toxins, immunoglobulins, and anti-microbial peptides. Acid mucins can surround and eliminate many pathogenic microorganisms. We performed a quantitative analysis of the density and mucus composition of different intestinal mucous cell types from mullet (Chelon ramada) that were infected solely with Neoechinorhynchus agilis. Most N. agilis were encountered in the middle region of the intestine. Mucous cell types were identified with Alcian Blue (pH2.5) and Periodic acid-Schiff (PAS) histochemistry, and by staining with a panel of seven lectins. Mucus enriched for high viscosity acid mucins was accumulated near points of worm attachment. Parasites were surrounded by an adherent mucus layer or blanket. Ultrastructural examination showed intestinal mucous cells typically possessed an elongated, basally positioned nucleus and numerous electron dense and lucent vesicles in the cytoplasm. The results show both an increase in mucus production and changes in mucin composition in infected mullet in comparison with uninfected conspecifics.
Collapse
Affiliation(s)
- Giampaolo Bosi
- Department of Health, Animal Science and Food Safety, Università degli Studi di Milano, St. Trentacoste 2, 20134, Milan, Italy.
| | | | - Emanuele Rossetti
- Consortium of Fishing Cooperatives of the Polesine, Scardovari, St. Borsa 11, 45018 Rovigo, Italy
| | - Bahram Sayyaf Dezfuli
- Department of Life Sciences & Biotechnology, University of Ferrara, St. Borsari 46, 44121, Ferrara, Italy
| |
Collapse
|
6
|
Vidal MR, Ruiz TFR, Dos Santos DD, Gardinal MVB, de Jesus FL, Faccioli CK, Vicentini IBF, Vicentini CA. Morphological and histochemical characterisation of the mucosa of the digestive tract in matrinxã Brycon amazonicus (Teleostei: Characiformes). JOURNAL OF FISH BIOLOGY 2020; 96:251-260. [PMID: 31762020 DOI: 10.1111/jfb.14217] [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] [Received: 08/30/2019] [Accepted: 11/22/2019] [Indexed: 06/10/2023]
Abstract
This study describes anatomical, histological and histochemical features of the digestive tract mucosal layer of the matrinxã Brycon amazonicus, an omnivorous freshwater fish endemic from the Amazon basin. This species presents short thick oesophagus with longitudinal folds, that allow the passage of large food items. The mucosa is lined with a stratified secretory epithelium rich in goblet cells that secrete neutral and acid mucins. The two mucin types provide different viscosity in anterior and posterior oesophagus related to the protective and lubricant functions, respectively. The stomach is a highly distensible Y-shaped saccular organ. Here, it is proposed that this anatomical shape plays an essential role in food storage when food availability is abundant. The stomach mucosa is composed of epithelial cells with intense neutral mucin secretion to protects against gastric juice. The intestine is slightly coiled and presents internally a complex pattern of transversal folds that increases the absorption surface and the retention time of food. Goblet cells in the intestine secrete acid and neutral mucins that lubricate the epithelium and aid in the digestive processes. In the rectum, an increase in goblet cells population occurs that may be related to better lubrication.
Collapse
Affiliation(s)
- Mateus R Vidal
- School of Sciences, Department of Biological Sciences, São Paulo State University (Unesp), São Paulo, Brazil
- Institute of Biosciences, Department of Morphology, São Paulo State University (Unesp), Botucatu, Brazil
| | - Thalles F R Ruiz
- School of Sciences, Department of Biological Sciences, São Paulo State University (Unesp), São Paulo, Brazil
| | - Diego D Dos Santos
- School of Sciences, Department of Biological Sciences, São Paulo State University (Unesp), São Paulo, Brazil
| | - Mario V B Gardinal
- Institute of Biosciences, Department of Zoology, São Paulo State University (Unesp), Botucatu, Brazil
| | - Fernando L de Jesus
- Institute of Biomedical Sciences, Department of Human Anatomy, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Claudemir K Faccioli
- Institute of Biomedical Sciences, Department of Human Anatomy, Federal University of Uberlândia (UFU), Uberlândia, Brazil
| | - Irene B F Vicentini
- School of Sciences, Department of Biological Sciences, São Paulo State University (Unesp), São Paulo, Brazil
- Aquaculture Center of Unesp, São Paulo State University (Unesp), Jaboticabal, Brazil
| | - Carlos A Vicentini
- School of Sciences, Department of Biological Sciences, São Paulo State University (Unesp), São Paulo, Brazil
- Aquaculture Center of Unesp, São Paulo State University (Unesp), Jaboticabal, Brazil
| |
Collapse
|