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Immunomodulatory effects of hydrolyzed Debaryomyces hansenii in Atlantic salmon (Salmo salar L): From the in vitro model to a natural pathogen challenge after seawater transfer

ABSTRACT: Non-Saccharomyces yeast such as Debaryomyces hansenii or its cell wall-components are emerging candidates for novel functional aquafeeds, as they contain several microbe-associated molecular patterns (MAMPs) that can activate and modulate the host’s physiological responses and improve fish health and welfare. RNAseq results showed an upregulation in pathways associated with humoral immunity and complement activation in the liver. Considering these data, LAN6 could be a promising functional candidate for aquafeeds to achieve a more resilient salmon during fish farming.

ORGANISM(S): Salmo salar

PROVIDER: GSE216714 | GEO | 2023/08/29

REPOSITORIES: GEO

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Dietary Inclusion of Hydrolyzed Debaryomyces hansenii Yeasts Modulates Physiological Responses in Plasma and Immune Organs of Atlantic Salmon (Salmo salar) Parr Exposed to Acute Hypoxia Stress

Project description:The present work studies the effect of Debaryomyces hansenii yeast-based products on physiological responses in Atlantic salmon exposed to a short-term stress. For this, a control fishmeal-based diet (CD) and experimental diets containing 0.1% of Debaryomyces hansenii were fed to fish for 8 weeks in fresh water. At the end of the feeding experiment, fish were exposed to 1-minute hypoxia stress and samples were collected post-stress

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The farmed Atlantic salmon (Salmo salar) skin-mucus proteome

Project description:Norway is the largest producer and exporter of farmed Atlantic salmon (Salmo salar) worldwide. Skin disorders correlated with bacterial infections represent an important challenge for fish farmers due to the economic losses caused. Little is known about this topic, thus studying the skin-mucus of Salmo salar and its bacterial community depict a step forward in understanding fish welfare in aquaculture. In this study, we used label free quantitative mass spectrometry to investigate the skin-mucus proteins associated with both Atlantic salmon and bacteria. In addition, the microbial temporal proteome dynamics during 9 days of mucus incubation with sterilized seawater was investigated, in order to evaluate their capacity to utilize mucus components for growth in this environment.

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Adaptative response of Debaryomyces hansenii in co-culture with Yarrowia lipolytica

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Absolute expression level of Debaryomyces hansenii genes

Project description:Total RNA versus genomic DNA hybridization on custom arrays designed for all Debaryomyces hansenii genes Total RNA was collected in mid-log phase from Debaryomyces hansenii cells grown in rich medium (abbreviated CM, in house recipe). RNA was then converted to cDNA, Cy3-labeled and hybridized competitively against Cy5 labeled genomic DNA from Debaryomyces hansenii.

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Absolute expression level of Debaryomyces hansenii genes

Project description:Total RNA versus genomic DNA hybridization on custom arrays designed for all Debaryomyces hansenii genes

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Seawater transfer alters the intestinal microbiota profiles of Atlantic salmon (Salmo salar L.).

Project description:Atlantic salmon undergo dramatic physiological changes as they migrate from freshwater to the marine environment. Osmoregulatory adaptation is the most crucial change, necessitating functional adaptations of the gills, kidney and intestine. Additionally, novel pathogens, microbes and dietary items are encountered in the saltwater environment, which suggests major changes in the intestinal microbiota following movement to saltwater. Here we compared the intestinal microbiota harboured in the distal digesta of Atlantic salmon freshwater fish (FW) kept in a commercial Scottish freshwater hatchery with that of their full-siblings after seawater acclimatisation (SW) by a 16S rRNA (V3-V4) high-throughput sequencing approach. Alpha- and beta-diversity were found significantly higher in FW compared to SW, both in terms of richness and diversity. Metastats analysis identified a higher number of Operational Taxonomic Units (OTUs) unique to FW compared to SW, with an additional 238 OTUs found at significantly different abundance. A core microbiota of 19 OTUs was identified in 100% of all fish, which indicates that certain microbes are maintained to fulfil minimal functions within the gut. Furthermore we show that the uniqueness of the respective microbial profiles can be correlated with significant differences in KEGG pathways including lipid and amino acid metabolism.

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Dietary Inclusion of Hydrolyzed <i>Debaryomyces hansenii</i> Yeasts Modulates Physiological Responses in Plasma and Immune Organs of Atlantic Salmon (<i>Salmo salar</i>) Parr Exposed to Acute Hypoxia Stress.

Project description:Stress related to salmon aquaculture practices (handling, sub-optimal nutrition, diseases, and environmental problems) may compromise fish welfare. This study describes the effects of two hydrolyzed Debaryomyces hansenii yeast-based products (LAN4 and LAN6) on physiological and immune responses of Atlantic salmon (Salmo salar) parr exposed to short hypoxia stress. A commercial-like diet (control diet: CD) and two experimental diets (CD supplemented with 0.1% of either component LAN4 or LAN6) were fed to fish for 8 weeks. At the end of the feeding experiment, fish were exposed to 1-min hypoxia and samples were collected at 0, 1, 3, 6, 12, and 24 h post-stress. Results showed that plasma cortisol reached a peak at 1 h post-stress in CD and LAN6 groups, whereas no significant increase in cortisol levels was detected in the LAN4 group. Moreover, the LAN6 group enhanced IL-10 responses to hypoxia, when compared to the control and LAN4 group. This suggests a regulation of immunosuppressive profiles in fish fed LAN4. Hypoxia stress increased TNFα in all groups, which indicates that fish may compensate for the short-term stress response, by modulating innate immune molecules. The apparent suppression of hypoxia responses in the LAN4 group coincided with the detection of differences in goblet cells size and Muc-like proteins production in DI; and upregulation (1 h post-stress) of pathways related to oxygen transport, hemoglobin complex, and glutathione transferase activity and the downregulation of fatty acid metabolism (6 h post-stress) in gills. To conclude, a 1-min hypoxia stress exposure affects the response to stress and immunity; and D. hansenii-based yeast products are promising components in functional aquafeeds for salmon due to their ability to counteract possible consequences of hypoxic stress.

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Effects of yeast species and processing on transcriptomic profile and intestinal health of Atlantic salmon (Salmo salar) fed soybean meal-based diets in seawater

Project description:The objective of the current study was to examine the effects of yeasts on intestinal health and transcriptomic profile of Atlantic salmon fed SBM-based diets in seawater. Cyberlindnera jadinii (CJ) and Wickerhamomyces anomalus (WA) yeasts were produced in-house and processed by direct heat-inactivation with spray-drying (ICJ and IWA) or autolyzed at 50 ºC for 16 h (ACJ and AWA), followed by spray-drying. Six diets were formulated, one based on fishmeal (FM), a challenging diet with 30% soybean meal (SBM) and four other diets containing 30% SBM and 10% of each of the four yeast fractions (i.e., ICJ, ACJ, IWA and AWA). The results showed that the inclusion of CJ yeasts reduced loss of supranuclear vacuolization, along with reduction in population of CD8α positive cells present in the lamina propria of fish fed the SBM diet. The CJ yeasts controlled the inflammatory profile of fish fed SBM through up-regulation of pathways related to wound healing and taurine metabolism. Additionally, the WA yeasts dampened the inflammatory profile of fish fed SBM through down-regulation of pathways related to toll-like receptor signaling, C-lectin receptor, cytokine receptor and signal transduction. The results suggest that yeasts could be used as protein ingredients with functional properties in diets for Atlantic salmon.

2022-01-15 | GSE193239 | GEO

A novel betaproteobacterial agent of gill epitheliocystis in seawater farmed Atlantic salmon (Salmo salar).

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RNA seq of mouse bone marrow derived macrophages treated with Debaryomyces hansenii against untreated controls

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2021-04-14 | E-MTAB-9806 | biostudies-arrayexpress

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