Effect of dietary immunostimulation in the portals of entry of rainbow trout after LPS challenge
Ontology highlight
ABSTRACT:
ORGANISM(S): Oncorhynchus mykiss
SUBMITTER: Carmen Doñate
PROVIDER: E-GEOD-12961 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:The effect of dietary immunostimulation in the portals of entry, intestine and gills, of rainbow trout (Oncorhynchus mykiss), was investigated using a salmonid-specific microarray platform enriched with immune-related genes. IS-diet feeding significantly changed transcriptomic expression profiles: larger reduction rather than induction was observed, with significant changes in genes and functional GO categories related to remodeling processes and antigen presentation. The results revealed that one of the main effects of IS-diets in trout is the increase of genes involved in antigen recognition in epithelial cells of gills. Adult rainbow trout (Oncorhynchus mykiss) were randomly distributed in four fibreglass tanks (25 fish per tank). During the feeding trial, trouts were hand-fed once a day with either the control diet or the immunodiet, in duplicate tanks, following manufacturer’s indication of 1 g food/fish for 4 weeks. After the 4 weeks, 4 fish of each tank (8 for each diet) were sampled for microarray analysis. Tissues removed for RNA extraction were frozen in liquid nitrogen and stored at -80 ºC. Total RNA was extracted from the organs using 1 ml of Tri Reagent (Sigma) per 100 mg of tissue, following the manufacturer’s instructions and quantity and integrity was analyzed by Experion RNA StdSens Analysis Kit (Bio-Rad). The design of the microarray posses 1818 genes printed in six replicates each, including random clones from common and subtracted cDNA libraries which were compared with known vertebrate proteins using blastx. The platform was enriched in immune-related genes. RNA was pooled within treatments (n=8), and 15 µg of control and test were labeled with Cy3- and Cy5-dCTP (Amersham Pharmacia) using SuperScript III reverse transcriptase (Invitrogen) and oligo(dT) primer (Promega), and cDNA was purified with Microcon YM30 (Millipore). Dye swap method was used, therefore each sample was hybridized to two microarrays. For the first slide, test and control cDNA were labeled with Cy5 and Cy3 respectively, and for the second array dye assignments were reversed. Scanning was performed with Axon scanner 4000B and images were processed with GenePix Pro 6.0. After subtraction of mean background, and LOWESS normalization was performed. To assess differential expression of genes, the normalized log intensity ratios were analyzed with Student’s t-test (p<0.01) and genes were ranked by log(p-level). The Bayesian modification to the false discovery rate (FDR) was used to correct for multiple comparison tests, estimating the q-value for the set of differentially expressed genes. The functional categories of Gene Ontology were compared with regulated genes (p<0.01) by the sums of ranks (Student’s t-test, p<0.05) and the statistical significance of over represented functional categories was assessed using the Yates correction to Chi square test (corrected p<0.05).
2008-03-31 | E-GEOD-10981 | biostudies-arrayexpress
Project description:The effect of dietary immunostimulation in the immune organs, head kidney and spleen, of rainbow trout (Oncorhynchus mykiss), was investigated using a salmonid-specific microarray platform enriched with immune-related genes. Immunostimulant-diet feeding significantly changed transcriptomic expression profiles: larger reduction rather than induction was observed, with significant regulation in genes and functional GO categories related to remodeling processes and immune and hematopoietic activities. The results revealed that Immunostimulant-diets hava effect in the transcriptome of cultured fish. Keywords: spleen, head kidney, immunostimulats, transcriptomic response, trout Adult rainbow trout (Oncorhynchus mykiss) were randomly distributed in four fibreglass tanks (25 fish per tank). During the feeding trial, trouts were hand-fed once a day with either the control diet or the immunodiet, in duplicate tanks, following manufacturer’s indication of 1 g food/fish for 4 weeks. After the 4 weeks, 4 fish of each tank (8 for each diet) were sampled for microarray analysis. Tissues removed for RNA extraction were frozen in liquid nitrogen and stored at -80 ºC. Total RNA was extracted from the organs using 1 ml of Tri Reagent (Sigma) per 100 mg of tissue, following the manufacturer’s instructions and quantity and integrity was analyzed by Experion RNA StdSens Analysis Kit (Bio-Rad). The design of the microarray posses 1818 genes printed in six replicates each, including random clones from common and subtracted cDNA libraries which were compared with known vertebrate proteins using blastx. The platform was enriched in immune-related genes. RNA was pooled within treatments (n=8), and 15 µg of control and test were labeled with Cy3- and Cy5-dCTP (Amersham Pharmacia) using SuperScript III reverse transcriptase (Invitrogen) and oligo(dT) primer (Promega), and cDNA was purified with Microcon YM30 (Millipore). Dye swap method was used, therefore each sample was hybridized to two microarrays. For the first slide, test and control cDNA were labeled with Cy5 and Cy3 respectively, and for the second array dye assignments were reversed. Scanning was performed with Axon scanner 4000B and images were processed with GenePix Pro 6.0. After subtraction of mean background, and LOWESS normalization was performed. To assess differential expression of genes, the normalized log intensity ratios were analyzed with Student’s t-test (p<0.01) and genes were ranked by log(p-level). The Bayesian modification to the false discovery rate (FDR) was used to correct for multiple comparison tests, estimating the q-value for the set of differentially expressed genes. The functional categories of Gene Ontology were compared with regulated genes (p<0.01) by the sums of ranks (Student’s t-test, p<0.05) and the statistical significance of over represented functional categories was assessed using the Yates correction to Chi square test (corrected p<0.05).
2008-08-27 | E-GEOD-11949 | biostudies-arrayexpress
Project description:The response of the trout, O.mykiss, head kidney to bacterial lipopolysaccharide (LPS) or active and attenuated infectious hematopoietic necrosis virus (IHNV and attINHV respectively) intraperoniteal challenge, 24 and 72 hours post-injection, was investigated using a salmonid-specific cDNA microarray. The head kidney response to i.p. LPS-induced inflammation in the first instance displays an initial stress reaction involving suppression of major cellular processes, including immune function, followed by a proliferative hematopoietic-type/biogenesis response 3 days after administration. The viral response at the early stage of infection highlights a suppression of hematopoietic and protein biosynthetic function and a stimulation of immune response. In fish infected with IHNV a loss of cellular function including signal transduction, cell cycle and transcriptional activity 72 hours after infection reflects the tissue-specific pathology of IHNV infection. attIHNV treatment on the other hand shows a similar pattern to native IHNV infection at 24 hours however at 72hours a divergence from the viral response is seen and replace with a recovery response more similar to that observed for LPS is observed. Rainbow trout, Oncorhynchus mykiss were intraperitoneally injected with saline (control) and LPS (6mg/Kg), or with 100 μl of a 106 pfu/ml dilution of IHNV or attIHNV or culture medium (negative control). At defined time points, 24 and 72 hours post i.p. injection, animals (total n=6), control and experimental, were selected from each tank (n=2) and sacrificed. Head kidneys (HK) were immediately dissected out, pooled and processed for total RNA purification using Tri Reagent (Molecular Research Center, Cincinnati, OH, USA) according to the manufacturerâs protocol.The design of the microarray includes 1380 genes printed in six replicates each. Random clones from common and subtracted cDNA libraries (976) were compared with the known vertebrate proteins using blastx and 686 genes were identified; the functional annotations were transferred from the putative homologs. These clones were supplemented with 297 genes selected by the categories of Gene Ontology. Overall, each microarray was enriched in a number of functional classes, such as stress and defense response (145 and 105 genes, respectively), cell cycle (62 genes), signal transduction (114 genes), chaperone activity (41 genes), and apoptosis (79 genes). Total RNA obtained from head kidney tissue was verified for quantity and integrity by denaturing electrophoresis and labeling with Cy3- and Cy5-dCTP (Amersham Pharmacia) was completed using SuperScript III reverse transcriptase (Invitrogen) and oligo(dT) primer, and cDNA was purified with Microcon YM30 (Millipore). We used a dye swap experimental design and each sample was hybridized to two microarrays. For the first slide, test and control cDNA were labeled with Cy5 and Cy3 respectively, and for the second array dye assignment was reversed. All head kidney samples were analyses using the dye swap protocol. Scanning was performed with ScanArray 5000 and images were processed with QuantArray (GSI Luminomics. After subtraction of mean background, locally weighted non-linear regression (Lowess) normalization was performed separately for each slide. To assess differential expression of genes, the normalized log intensity ratios were analyzed with Studentâs t-test (p<0.01). The Bayesian modification to the false discovery rate (FDR) was used to correct for multiple comparison tests, estimating the q-value for the set of differentially expressed genes
2010-06-25 | E-GEOD-10272 | biostudies-arrayexpress
Project description:The aim of the current study was to investigate the response of in vitro differentiated trout macrophages, a primary cell culture system widely used in fish immunology research, to lipopolysaccharide (LPS) and to the analog viral ds(RNA) Poly I:C. To that end we have used a salmonid-specific microarray platform enriched with immune-related genes. The results clearly suggest that the molecular mechanisms involved in the response of macrophages to LPS and Poly (I:C) are specific in some signaling pathways related to cell communication, signal transduction and kinase cascades. Nevertheless, macrophages stimulated with bacterial or viral PAMPs also activate common transcription factors. Trout macrophages were isolated using the protocol previously described Head kidneys were dissected, placed in sterile 100 µm nylon mesh cell-strainers and homogenized in the presence of DMEM (PAA Laboratories) containing high glucose, 10% heat inactivated FCS (PAA Laboratories) and Primocin antibiotic (100 µg/ml, Invivogen). The homogenates were plated on 60 mm poly-D-lysine (Sigma) treated cell culture Petri plates, 3 ml per plate. The cultures were kept in an incubator at 16 º C and 5% CO2. Non-adhering cells were removed after 24 hours and new medium was added, then adherent cells were incubated for another 4 days. After 5 total days of culture, medium was removed and test cells were stimulated adding fresh medium containing 10 µg/ml of LPS from E. coli (serotype 026:B6, Sigma) or 10 µg/ml of Poly (I:C) (Invivogen), whereas medium free of stimulant was added in control plates. All culture plates were incubated for 12h. Six independent experiments (six different fish) were performed for each condition. Total RNA was extracted from the cultures using 1 ml of Tri Reagent (Sigma), following the manufacturerâ??s instructions and quantity and integrity was analyzed by Experion RNA StdSens Analysis Kit (Bio-Rad). The design of the microarray posses 1818 genes printed in six replicates each, including random clones from common and subtracted cDNA libraries which were compared with known vertebrate proteins using blastx. The platform was enriched in immune-related genes.
2010-06-25 | E-GEOD-13197 | biostudies-arrayexpress
Project description:In this project, effects of chronic temperature changes on the transcriptome of the rainbow trout heart (Oncorhynchus mykiss) were examined. Ectothermic animals of north-temperate latitudes experience large seasonal changes in temperature which strongly affect the rate of body functions. To compensate for the effects of temperature changes ectotherms can respond to chronic temperature changes by increasing the quantity of tissue or enzyme needed for different physiological tasks, or by expressing proteins isoforms which are more appropriate for the new thermal conditions. On the other hand, proteins which are needed in lesser amounts in the new thermal regime could be depressed or down-regulated. Although expression of proteins can be changed by multiple mechanisms during synthesis and degradation, temperature dependent changes in transcription of genes is probably the most important factor in modifying the proteome of the tissues. Rainbow trout are active throughout their thermal tolerance range (0-25°C). Maintenance of adequate cardiac function at different thermal conditions requires a thorough change of the cardiac phenotype which appears as compensatory changes in relative heart mass, energy metabolism, nervous and humoral control of cardiac contractility and in electrical and mechanical properties of the trout heart. Such an extensive structural and functional remodeling of the heart probably necessitates both qualitative and quantitative changes among the numerous macromolecules which constitute the cardiac phenotype and cannot, therefore, be solely based on posttranslational modification of proteins but is expected to require differential gene expression. As a power supply of the circulatory system, the heart is in the focal point of physiological plasticity and sets limits for the activity level of the animal in different thermal conditions. Although several aspects of heart function have been studied in thermally acclimated fish and a number of structural changes have been noticed on exposure to different temperatures, the cellular and molecular mechanisms involved in chronic thermal stress of the fish heart are only partially elucidated. An interesting and poorly examined feature of the cold-acclimated phenotype of the trout heart is the increased heart mass which attenuates the depressive effect of low temperature on cardiac pump function. The heart is a complex organ composed of multiple tissues which together provide the system all necessary qualifications for cardiac pump function. In addition to the contractile and metabolic machinery of the cardiac myocytes, the amount and quality of the extracellular matrix also contribute to the properties of the heart as a muscular pump. Due to the complexity of the heart an enormous amounts of research efforts are needed to find out and examine all crucial aspects of cardiac plasticity required for thermal acclimation. In this regard the screening of gene expression by cDNA micro arrays might provide a broader view to genomic basis of cardiac remodeling under changing temperatures and aid to reveal the candidate genes which are important for thermal acclimation and which might remain unnoticed by traditional biochemical and physiological methods. In the present study we the steady-state effects of temperature acclimation on gene expression of the rainbow trout heart were screened by micro array analysis.
2010-06-10 | E-GEOD-2277 | biostudies-arrayexpress
Project description:The effect of dietary immunostimulation in the immune organs, head kidney and spleen, of rainbow trout (Oncorhynchus mykiss), was investigated using a salmonid-specific microarray platform enriched with immune-related genes. Immunostimulant-diet feeding significantly changed transcriptomic expression profiles: larger reduction rather than induction was observed, with significant regulation in genes and functional GO categories related to remodeling processes and immune and hematopoietic activities. The results revealed that Immunostimulant-diets hava effect in the transcriptome of cultured fish. Keywords: spleen, head kidney, immunostimulats, transcriptomic response, trout
2008-08-27 | GSE11949 | GEO
Project description:Metabolic processes and sexual maturation closely interact during the long-distance reproductive migration of many fish species to their spawning grounds. In the present study, we have for the first time used exercise experimentally to investigate the effects on sexual maturation in rainbow trout. Pubertal autumn-spawning seawater-raised female rainbow trout Oncorhynchus mykiss (n=26; 50-cm, 1.5-kg) were rested or swum at a near optimal speed of 0.75 body-lengths per second in a 6,000 L swim-flume under natural reproductive conditions (16 °C fresh-water, starvation, 8h-light:16h-dark photoperiod). Fish were sampled after arrival and subsequently after 10 days (resting or swimming 307 km) and 20 days (resting or swimming 636 km). Ovarian development was significantly reduced in the swimmers. Analysis of the expression of key factors in the reproductive axis included pituitary kiss1-receptor, lh and fsh and ovarian lh-receptor, fsh-receptor, aromatase and vitellogenin-receptor (vtgr). Swimmers had lower pituitary lh and ovarian vtgr expression than resters. Furthermore, the number of late vitellogenic oocytes was lower in swimmers than in resters, probably resulting from the lower vtgr expression, and vitellogenin plasma levels were higher. Therefore, swimming exercise suppresses oocyte development possibly by inhibiting vitellogenin uptake. Transcriptomic changes that occurred in the ovary of exercised fish were investigated using a salmonid cDNA microarray platform. Protein biosynthesis and energy provision were among the sixteen functional categories that were all down-regulated in the ovary. Down-regulation of the transcriptomic response in the ovary illustrates the priority of energy reallocation and will save energy to fuel exercise. A swimming-induced ovarian developmental suppression at the start of vitellogenesis during long-term reproductive migration may be a strategy to avoid precocious muscle atrophy. In order to simulate the natural reproductive conditions of anadromous salmonids, experiments were performed with sea water-raised rainbow trout, Oncorhynchus mykiss. Resters and swimmers were starved during the experiment, seawater was replaced by fresh water and photoperiod was changed. These changes were expected to affect reproductive parameters but as âbackgroundâ effect because both resters as swimmers were experiencing these conditions at the same time in the same set-up. Any additional effects in swimming fish would thus be caused by swimming only. Pubertal autumn spawning rainbow trout (n=26; ~50 cm, ~1.5 kg) were purchased from a Danish exporter (Frederiksvaerk Aleexport) where they had been raised for 2 years in freshwater followed by 4 months in sea water cages at 10 â°. They were transferred by truck within 16 h to Spakenburg (Spakenburg Paling, The Netherlands) and subsequently in the same water in a similar holding tank to the swim-flume at Leiden University (The Netherlands). The next day, 5 randomly chosen fish were sampled as âstartâ-group while others were randomly divided into a ârestâ-group (n=10) and a âswimâ-group (n=11). During the following 4 days, the brackish 10 â° water was stepwise replaced by freshwater at 16 °C and photoperiod was changed from 16L:8D to 8L:16D. Fish were then acclimatized for two days to their new conditions. Subsequently, swimmers were first swum at a speed of 0.33 body-lengths per second (BL/s) which was increased the next day to the final, near optimal speed of 0.75 BL/s (0.34 m/s or 29.4 km/day). Fish were sampled after 10 days (5 resters and 5 swimmers) and 20 days (5 resters and 6 swimmers). At sampling, fish were anesthetized using oil of cloves that was commercially purchased from a drugstore (diluted 1:10 in ethanol and used at a dosage of 1.5 ml/l). Fish were euthanized by decapitation and dissected for the ovary which was flash frozen in liquid nitrogen. RNA was isolated from pituitary and ovary samples according to the TRIZOL reagent protocol by Invitrogen (Baro, Spain). Isolated RNA was DNAse treated using RQ1 DNAse Promega (Madison, USA) and reverse transcribed using Superscript IIITM (Baro, Spain) according to the manufacturerâs protocol. Microarray analyses were performed on ovarian tissue for 20-days-swimmers vs. 20-days-resters. A rainbow trout cDNA microarray platform was used that was previously validated and described by Koskinen et al., 2004ab, Krasnov et al., 2005, MacKenzie et al., 2006ab, 2008 and Djordjevic et al., 2009, and deposited in GEO under accession number GPL1212, the original cDNA microarray (SFA2.0 chip), and GPL6154; the updated 1.8 K platform. This platform compromises 1818 genes representing 366 functional categories. Total RNA was extracted from flash frozen samples from experimental fish of the 20-days-swim group (n=5) and 20-days-rest group (n=5) like described before. Total RNA corresponding to pooled samples from the swim or rest groups was labeled with Cye3 and Cye5-dCTP (GE Healthcare, Barcelona, Spain) using SuperScript III reverse transcriptase (Invitrogen, Baro, Spain) and oligo(dT) primer. In our experience, reverse labeling combined with multiple replication of spots provide robust normalization and high statistical power of analyses. cDNA was purified with MicroconYM30 (Millipore). The slides were pretreated with 1% BSA(fraction V), 20 à SSC, 10% SDS (30 min at 50°C) and washed with 2 à SSC (3 min) and 0.2 à SSC (3 min) and hybridized overnight in cocktail containing 50 à Denhardt's, 20 à SSC, 10% SDS, 10μg/μl polyadenylate and 10 μg/μl yeast tRNA. All chemicals were from Sigma-Aldrich. Scanning was performed with ScanArray 5000 and images were processed with QuantArray (GSI Luminomics). The measurements in spots were filtered by criteria I/B ⥠3 and (I-B)/(SI + SB) ⥠0.6, where I and B are the mean signal and background intensities and SI, SB are the standard deviations. After subtraction of mean background, LOWESS normalization was performed. To assess differential expression of genes, the normalized log intensity ratios (expression ratio) were analyzed with Student's t-test (P <0.05). Validation of the microarray was performed by Q-PCR of 6 differentially expressed genes (DEGs) as described above. The used primers were either published (Alpha-globin I-1: Donate Jimeno, 2008) or designed, again by using the Genamics software.
2010-06-24 | E-GEOD-20131 | biostudies-arrayexpress
Project description:Background: The decreasing availability of fishmeal as a protein source in aquaculture diets will require aquaculture to develop an econmoical and sustainable protien replacement. Plant proteins are readily available and are being tested as a promising alternative to replace a substantial portion of fishmeal which currently provides most of the protein content in aquaculture diets. The types of plant protein feasible for incorporation into aquaculture diets will likely contain various anti-nutritional compounds, carbohydrates, fiber, and a different amino acid profile than what is found in fishmeal. Substantial genetic variation was previously observed for growth on plant based dits in rainbow trout Hence, it will be beneficial to identify metabolic and physiologic pathways related to enhanced plant protein utilization which will aid in identifying genes that contribute to this genetic variation. Results: Microarray analysis of liver samples from two families of rainbow trout that differed in their growth responses when compared between individuals grown on a fish meal or plant protein based diet. Differential expression relating to dietary utilization between the two families found significant changes in expression of 33 ESTs. Eight of the differntially expressed ESTs had identified mammalian homologs that had been previously researched with identified cellular interactions and functions. Conclusions: Utilizing pathway analysis software to analyze sequences annotated with known mammalian genes were were ablet o map gene pathway and process interactions. From this information we were able to infer that the metabolic changes associated with utilization of plant protein versus fishmeal were associated with differential reaulation of genes related to cell oxidative stress, proliferation, growth, and survival. Furthermore, we inferred from the changes we observed in immune response genes expression that ingestion of this plant based diet upregulated the expression of genes involved in immunoregulatroy processes. Genotyped samples linked to families that had 4 or more members sampled on each diet were identified and ranked according to average family weight on each diet. Size rankings corresponded to large (>750 g), medium (600-640 g), and small (<500 g). From these identified groups 2 families were chosen for microarray expression analysis that demonstrated individuals with growth differences between the two diets. Data for the two families used for analysis and slide arrangements are listed in table 3. The families compared for growth differences between diets used for this study only differed by one growth range, large fish on fish meal compared to medium fish on plant-based diet and medium sized fish on fishmeal diet compared to small fish on plant-based diet. This strategy to use size separation within family was an attempt to identify gene changes more specific to diet utilization than specific for growth differences.
2011-04-01 | E-GEOD-28310 | biostudies-arrayexpress
Project description:Rainbow trout (Oncorhynchus mykiss) were fed during 4 weeks with either a control diet or an immunostimulant diet and then injected with LPS to investigate the effect of dietary immunostimulation in the portals of entry, intestine and gills, using a salmonid-specific microarray platform enriched with immune-related genes. IS-diet feeding significantly changed transcriptomic expression profiles in response to LPS: significant changes in genes and functional GO categories related to remodeling processes and antigen presentation were different for both diets. The results revealed that one of the main effects of IS-diets in trout is the increase of genes involved in antigen recognition and in adaptive immunity. Keywords: gills, intestine, immunostimulats, transcriptomic response, trout
2008-10-02 | GSE12961 | GEO
Project description:The sustainable development of modern aquaculture must rely on a significant reduction of the fish meal (FM) used in aquafeed formulations. However, FM substitution with alternative ingredients in diets for carnivorous fish species often showed reduced nutrient absorption, significantly perturbed metabolisms and histological changes at both hepatic and intestinal level. In the present study, adult rainbow trout (Oncorhynchus mykiss) were fed three different experimental aquafeed formulations. A control diet with higher FM content (27.3%) than two test formulations in which fish meal was substituted with two more sustainable and promising alternatives: insect meal (Hermetia illucens larvae=10.1%, FM=11.6%) and poultry by-products meal (PBM=14.8%; FM=11.7%). Combined metabolomics and proteomics analyses of fish liver, together with histological examination of liver and intestine demonstrated that a well balanced formulation of nutrients in the three diets allowed high metabolic compatibility of either substitutions, paving the way for innovative and sustainable use of novel raw materials for the fish feed industry. Results show that the main metabolic pathways of nutrient absorption and catabolism were essentially unaltered by alternative feed ingredients, and also histological alterations were negligible. It is demonstrated that substitution of fish meal with sustainable alternatives does not impact on fish metabolism, given proper efforts are put in fulfilling nutritional requirements of rainbow trout.
2022-07-18 | PXD033201 | Pride