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Skedsmo FS, Løkka G, Chikwati E, Jacobsen JV, Espenes A, Kortner TM. Intestinal strangulation in farmed Atlantic cod (Gadus morhua): Pathological changes and possible predisposing anatomical features. J Fish Dis 2024:e13955. [PMID: 38587083 DOI: 10.1111/jfd.13955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 04/09/2024]
Abstract
During recent years, there has been a renewed interest in establishing farming of Atlantic cod (Gadus morhua) in Norway. However, a fatal abdominal disorder compromises animal welfare and causes economic losses. A similar problem was present during a previous attempt to establish Atlantic cod farming more than a decade ago. In this paper, we provide the first in-depth description of this intestinal disorder, which is correctly denoted 'strangulating obstruction'. In affected fish, part of the intestine is permanently entrapped (incarcerated) under fibrous strands in the mesentery. The entrapment interferes with blood flow and physically blocks the intestine, causing a strangulating obstruction with severe venous congestion and ischemia of the intestinal wall. Furthermore, comparison of macroscopical and histological anatomy of farmed and wild Atlantic cod is presented and risk factors associated with the anatomical differences are discussed.
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Affiliation(s)
- Fredrik Strebel Skedsmo
- Pathology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), As, Norway
| | - Guro Løkka
- Nutrition and Health Unit, Faculty of Veterinary Medicine, NMBU, As, Norway
| | - Elvis Chikwati
- Nutrition and Health Unit, Faculty of Veterinary Medicine, NMBU, As, Norway
| | | | - Arild Espenes
- Pathology Unit, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), As, Norway
| | - Trond M Kortner
- Nutrition and Health Unit, Faculty of Veterinary Medicine, NMBU, As, Norway
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2
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Zhou W, Lie KK, Chikwati E, Kousoulaki K, Lein I, Sæle Ø, Krogdahl Å, Kortner TM. Soya saponins and prebiotics alter intestinal functions in Ballan wrasse ( Labrus bergylta). Br J Nutr 2023; 130:765-782. [PMID: 36632013 PMCID: PMC10404481 DOI: 10.1017/s000711452200383x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 11/05/2022] [Accepted: 11/21/2022] [Indexed: 01/13/2023]
Abstract
A 5-week feeding trial was conducted in the cleaner fish Ballan wrasse (Labrus bergylta) for a better understanding of the basic biology of the intestinal functions and health in this stomach less species. During the trial, Ballan wrasse was fed either a reference diet, the reference diet supplemented with (i) a commercial prebiotic (Aquate™ SG, 0·4 %) expected to have beneficial effects, (ii) soya saponins (0·7 %) expected to induce inflammation or (iii) a combination of the prebiotics and the soya saponins to find a remedy for gut inflammation. Blood, intestinal tissue and gut content from four consecutive intestinal segments (IN1 - IN4) were collected. No significant differences in fish growth were observed between the four dietary groups. Saponin supplementation, both alone and in combination with prebiotics, increased weight index of IN2 and IN3 and decreased blood plasma glucose, cholesterol and total protein. Dry matter of intestinal content and activity of digestive enzymes were not affected by diet. Histomorphological analyses revealed a progressing inflammation with increased infiltration by immune cells particularly into the distal parts of the intestine in fish fed diets with saponins, both alone and in combination with prebiotics. Gene expression profiles obtained by RNA sequencing and quantitative PCR mirrored the histological and biochemical changes induced by the saponin load. The study demonstrated that Ballan wrasse gut health and digestive function may be markedly affected by feed ingredients containing antinutrients.
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Affiliation(s)
- Weiwen Zhou
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Kai K. Lie
- Feed and Nutrition, Institute of Marine Research, Bergen, Norway
| | - Elvis Chikwati
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway
| | | | | | - Øystein Sæle
- Feed and Nutrition, Institute of Marine Research, Bergen, Norway
| | - Åshild Krogdahl
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Trond M. Kortner
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences (NMBU), Ås, Norway
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Askarian F, Tsai CM, Cordara G, Zurich RH, Bjånes E, Golten O, Vinther Sørensen H, Kousha A, Meier A, Chikwati E, Bruun JA, Ludviksen JA, Choudhury B, Trieu D, Davis S, Edvardsen PKT, Mollnes TE, Liu GY, Krengel U, Conrad DJ, Vaaje-Kolstad G, Nizet V. Immunization with lytic polysaccharide monooxygenase CbpD induces protective immunity against Pseudomonas aeruginosa pneumonia. Proc Natl Acad Sci U S A 2023; 120:e2301538120. [PMID: 37459522 PMCID: PMC10372616 DOI: 10.1073/pnas.2301538120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 05/30/2023] [Indexed: 07/20/2023] Open
Abstract
Pseudomonas aeruginosa (PA) CbpD belongs to the lytic polysaccharide monooxygenases (LPMOs), a family of enzymes that cleave chitin or related polysaccharides. Here, we demonstrate a virulence role of CbpD in PA pneumonia linked to impairment of host complement function and opsonophagocytic clearance. Following intratracheal challenge, a PA ΔCbpD mutant was more easily cleared and produced less mortality than the wild-type parent strain. The x-ray crystal structure of the CbpD LPMO domain was solved to subatomic resolution (0.75Å) and its two additional domains modeled by small-angle X-ray scattering and Alphafold2 machine-learning algorithms, allowing structure-based immune epitope mapping. Immunization of naive mice with recombinant CbpD generated high IgG antibody titers that promoted human neutrophil opsonophagocytic killing, neutralized enzymatic activity, and protected against lethal PA pneumonia and sepsis. IgG antibodies generated against full-length CbpD or its noncatalytic M2+CBM73 domains were opsonic and protective, even in previously PA-exposed mice, while antibodies targeting the AA10 domain were not. Preexisting antibodies in PA-colonized cystic fibrosis patients primarily target the CbpD AA10 catalytic domain. Further exploration of LPMO family proteins, present across many clinically important and antibiotic-resistant human pathogens, may yield novel and effective vaccine antigens.
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Affiliation(s)
- Fatemeh Askarian
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Chih-Ming Tsai
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Gabriele Cordara
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway
| | - Raymond H Zurich
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Elisabet Bjånes
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Ole Golten
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, N-1432 Ås, Norway
| | | | - Armin Kousha
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Angela Meier
- Division of Critical Care, Department of Anesthesiology, University of California San Diego, La Jolla, CA 92037
| | - Elvis Chikwati
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, N-1432 Ås, Norway
| | - Jack-Ansgar Bruun
- Proteomics and Metabolomics Core Facility, Department of Medical Biology, The Arctic University of Norway, N-9037 Tromsø, Norway
| | | | - Biswa Choudhury
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
| | - Desmond Trieu
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
- School of Pharmacy, University of California San Francisco, San Francisco, CA 94143
| | - Stanley Davis
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | | | - Tom Eirik Mollnes
- Research Laboratory, Nordland Hospital, N-8005 Bodø, Norway
- Department of Immunology, University of Oslo Hospital, N-0424 Oslo, Norway
- Center of Molecular Inflammation Research, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
| | - George Y Liu
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
| | - Ute Krengel
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway
| | - Douglas J Conrad
- Division of Pulmonary, Critical Care and Sleep Medicine, University of California San Diego, La Jolla, CA 92037
| | - Gustav Vaaje-Kolstad
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, N-1432 Ås, Norway
| | - Victor Nizet
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, University of California San Diego, La Jolla, CA 92093
- Glycobiology Research and Training Center, University of California San Diego, La Jolla, CA 92093
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA 92093
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Sveen LR, Chikwati E, Dalum A, Kortner TM, Ravndal J, Einen O, Mørkøre T. Lesions of the biliary system in Atlantic salmon (Salmo salar L.). J Fish Dis 2023; 46:281-285. [PMID: 36308766 PMCID: PMC10092841 DOI: 10.1111/jfd.13724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Affiliation(s)
- Lene R. Sveen
- Norwegian Institute of Food Fisheries and Aquaculture Research (Nofima)TromsøNorway
| | - Elvis Chikwati
- Department of Paraclinical Sciences, Faculty of Veterinary MedicineNorwegian University of Life SciencesÅsNorway
| | - Alf Dalum
- Norwegian Institute of Food Fisheries and Aquaculture Research (Nofima)TromsøNorway
| | - Trond M. Kortner
- Department of Paraclinical Sciences, Faculty of Veterinary MedicineNorwegian University of Life SciencesÅsNorway
| | | | | | - Turid Mørkøre
- Department of Animal and Aquacultural Sciences, Faculty of BiosciencesNorwegian University of Life SciencesÅsNorway
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Zhou W, Krogdahl Å, Sæle Ø, Chikwati E, Løkka G, Kortner TM. Digestive and immune functions in the intestine of wild Ballan wrasse (Labrus bergylta). Comp Biochem Physiol A Mol Integr Physiol 2021; 260:111011. [PMID: 34174428 DOI: 10.1016/j.cbpa.2021.111011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 05/31/2021] [Accepted: 06/02/2021] [Indexed: 11/25/2022]
Abstract
This study was carried out to profile key characteristics of intestinal functions and health in wild-caught Ballan wrasse. To describe functional variation along the intestine, samples were collected from four intestinal segments, named from the proximal to the distal segment: IN1, IN2, IN3 and IN4. The sections showed quite similar structure, i.e. regarding mucosal fold height and branching, lamina propria and submucosal width and cellular composition and thickness of the muscle layers. Leucine aminopeptidase and maltase capacity decreased from IN1 to IN4, suggesting a predominant role of IN1 in digestion. Gene expression levels of vitamin C transporter (slc23a1) and fatty acid transporters (cd36 and fabp2) were higher in IN1 than in IN4, indicating a more important role of the proximal intestine regarding transport of vitamins and fatty acids. Higher expression of the gene coding for IgM heavy chain constant region (ighm) was found in IN4 than in IN1, suggesting an important immune function of the distal intestine. Other immune related genes il1b, il6, cd40, showed similar expression in the proximal and the distal part of the intestine. Parasite infection, especially the myxozoan parasite Enteromyxum leei, coincided with infiltration of lymphocytic and eosinophilic granular cells in the submucosa and lamina propria. The present study established reference information necessary for interpretation of results of studies of intestinal functions and health in cultured Ballan wrasse.
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Affiliation(s)
- Weiwen Zhou
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
| | - Åshild Krogdahl
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
| | - Øystein Sæle
- Feed and Nutrition, Institute of Marine Research, Bergen, Norway.
| | - Elvis Chikwati
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
| | - Guro Løkka
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
| | - Trond M Kortner
- Department of Paraclinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway.
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Krogdahl Å, Jaramillo-Torres A, Ahlstrøm Ø, Chikwati E, Aasen IM, Kortner TM. Protein value and health aspects of the seaweeds Saccharina latissima and Palmaria palmata evaluated with mink as model for monogastric animals. Anim Feed Sci Technol 2021. [DOI: 10.1016/j.anifeedsci.2021.114902] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Goverwa-Sibanda TP, Mupanguri C, Timire C, Harries AD, Ngwenya S, Chikwati E, Mapfuma C, Mushambi F, Tweya H, Ndlovu M. Hepatitis B infection in people living with HIV who initiate antiretroviral therapy in Zimbabwe. Public Health Action 2020; 10:97-103. [PMID: 33134123 DOI: 10.5588/pha.20.0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 07/18/2020] [Indexed: 11/10/2022] Open
Abstract
Setting There is little information about the diagnosis and treatment of hepatitis B virus (HBV) infection in people living with HIV (PLHIV) in Zimbabwe despite recommendations that tenofovir (TDF) + lamivudine (3TC) is the most effective nucleoside/nucleotide reverse transcriptase inhibitor (NRTI) backbone of antiretroviral therapy (ART) in those with dual infection. Objective To determine 1) numbers screened for hepatitis B surface antigen (HBsAg); 2) numbers diagnosed HBsAg-positive along with baseline characteristics; and 3) NRTI backbones used among PLHIV initiating first-line ART at Mpilo Opportunistic Infections Clinic, Bulawayo, Zimbabwe, between October 2017 and April 2019. Design This was a cross-sectional study using routinely collected data. Results Of the 422 PLHIV initiating first-line ART (median age 34 years, IQR 25-43), 361 (85%) were screened for HBV, with 10% being HBsAg-positive. HBsAg positivity was significantly associated with anaemia (adjusted prevalence ratio [aPR] 2.3, 95%CI 1.1-4.7) and elevated ala-nine transaminase levels (aPR 2.9, 95%CI 1.5-5.8). Of 38 PLHIV who were diagnosed HBsAg-positive, 30 (79%) were started on ART based on tenofovir (TDF) and lamivudine (3TC), seven were given abacavir (ABC) + 3TC-based ART and one was given zido vudine (ZDV) + 3TC-based ART. Conclusion In PLHIV, HBV screening worked well, the prevalence of HIV-HBV co-infection was high and most patients received appropriate treatment for both conditions. Recommendations to improve screening, diagnosis and treatment of HIV-HBV co-infection are discussed.
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Affiliation(s)
- T P Goverwa-Sibanda
- AIDS Healthcare Foundation, Zimbabwe, Harare.,Mpilo Hospital, Ministry of Health and Child Care, Bulawayo, Zimbabwe
| | - C Mupanguri
- National AIDS/TB Programme, Ministry of Health and Child Care, Harare, Zimbabwe
| | - C Timire
- National AIDS/TB Programme, Ministry of Health and Child Care, Harare, Zimbabwe.,National University of Science and Technology, Bulawayo, Zimbabwe.,International Union Against Tuberculosis and Lung Disease (The Union) Zimbabwe, Harare, Zimbabwe
| | - A D Harries
- The Union, Paris, France.,London School of Hygiene & Tropical Medicine, London, UK
| | - S Ngwenya
- Mpilo Hospital, Ministry of Health and Child Care, Bulawayo, Zimbabwe
| | - E Chikwati
- AIDS Healthcare Foundation, Zimbabwe, Harare
| | - C Mapfuma
- National University of Science and Technology, Bulawayo, Zimbabwe
| | - F Mushambi
- Parirenyatwa Group of Hospitals, Ministry of Health and Child Care, Harare, Zimbabwe
| | - H Tweya
- The Union, Paris, France.,The Lighthouse Clinic, Lilongwe, Malawi
| | - M Ndlovu
- Mpilo Hospital, Ministry of Health and Child Care, Bulawayo, Zimbabwe.,National University of Science and Technology, Bulawayo, Zimbabwe
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Hu H, Kortner TM, Gajardo K, Chikwati E, Tinsley J, Krogdahl Å. Intestinal Fluid Permeability in Atlantic Salmon (Salmo salar L.) Is Affected by Dietary Protein Source. PLoS One 2016; 11:e0167515. [PMID: 27907206 PMCID: PMC5132168 DOI: 10.1371/journal.pone.0167515] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 11/15/2016] [Indexed: 12/05/2022] Open
Abstract
In Atlantic salmon (Salmo salar L.), and also in other fish species, certain plant protein ingredients can increase fecal water content creating a diarrhea-like condition which may impair gut function and reduce fish growth. The present study aimed to strengthen understanding of the underlying mechanisms by observing effects of various alternative plant protein sources when replacing fish meal on expression of genes encoding proteins playing key roles in regulation of water transport across the mucosa of the distal intestine (DI). A 48-day feeding trial was conducted with five diets: A reference diet (FM) in which fish meal (72%) was the only protein source; Diet SBMWG with a mix of soybean meal (30%) and wheat gluten (22%); Diet SPCPM with a mix of soy protein concentrate (30%) and poultry meal (6%); Diet GMWG with guar meal (30%) and wheat gluten (14.5%); Diet PM with 58% poultry meal. Compared to fish fed the FM reference diet, fish fed the soybean meal containing diet (SBMWG) showed signs of enteritis in the DI, increased fecal water content of DI chyme and higher plasma osmolality. Altered DI expression of a battery of genes encoding aquaporins, ion transporters, tight junction and adherens junction proteins suggested reduced transcellular transport of water as well as a tightening of the junction barrier in fish fed the SBMWG diet, which may explain the observed higher fecal water content and plasma osmolality. DI structure was not altered for fish fed the other experimental diets but alterations in target gene expression and fecal water content were observed, indicating that alterations in water transport components may take place without clear effects on intestinal structure.
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Affiliation(s)
- Haibin Hu
- Department of Basic Sciences and Aquatic Medicine, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
- Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture) & Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, Qingdao, Shandong, P. R. China
| | - Trond M. Kortner
- Department of Basic Sciences and Aquatic Medicine, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Karina Gajardo
- Department of Basic Sciences and Aquatic Medicine, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - Elvis Chikwati
- Department of Basic Sciences and Aquatic Medicine, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
| | - John Tinsley
- BioMar Ltd., Grangemouth Docks, Grangemouth, United Kingdom
| | - Åshild Krogdahl
- Department of Basic Sciences and Aquatic Medicine, Faculty of Veterinary Medicine and Biosciences, Norwegian University of Life Sciences, Oslo, Norway
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