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21 pages, 3847 KB  
Article
Individual and Combined Effects of Medium- and Long-Chain Triacylglycerol and 2′-Fucosyllactose on Small Intestinal Morphology, Barrier Function, and Gut Microbiota in Growing C57BL/6 Mice
by Xinyuan Jin, Mengfan Shen, Mengdi Zhang, Haoqi Chen, Yufeng Jin, Yupeng Zeng, Zhijun Pan, Ziling Wang, Pan Wang, Yuting Yang, Zhiyuan Yan, Huilian Zhu and Dan Li
Nutrients 2025, 17(17), 2837; https://doi.org/10.3390/nu17172837 - 31 Aug 2025
Viewed by 464
Abstract
Background/Objectives: Medium- and long-chain triacylglycerol (MLCT) and 2′-fucosyllactose (2′-FL) are functional ingredients abundant in human milk; however, their effects on small intestinal development and health remain largely unknown, and no research has explored their potential combined effects. Methods: In this study, growing C57BL/6 [...] Read more.
Background/Objectives: Medium- and long-chain triacylglycerol (MLCT) and 2′-fucosyllactose (2′-FL) are functional ingredients abundant in human milk; however, their effects on small intestinal development and health remain largely unknown, and no research has explored their potential combined effects. Methods: In this study, growing C57BL/6 mice (3 weeks old) were fed diets without or with 2.5 g/100 g of MLCT, 2′-FL, or the combination (MLCT + 2′-FL; 5:1) for 21 days. Body weight, major organ indices, small intestinal morphology-related indicators (small intestinal length, villus height, crypt depth, villus height/crypt depth (V/C) ratio, and epithelial cell proliferation), and intestinal barrier function markers (goblet cell and Paneth cell count, protein expression of ZO-1 and occludin, and levels of sIgA and LPS) were measured. Results: In addition to the shared promotion of epithelial cell proliferation, MLCT intervention raised villus height and crypt depth, while 2′-FL intervention elevated Paneth cell count and sIgA levels. Notably, MLCT + 2′-FL intervention offered additional advantages (increasing the V/C ratio, goblet cell count, and expression of ZO-1 and occludin) without affecting crypt depth. 16S rRNA sequencing analysis of cecal contents revealed that all three interventions mainly affected beta diversity rather than alpha diversity, and enriched differentially abundant bacterial taxa: Erysipelotrichaceae, Faecalibaculum, UBA1819, and Faecalitalea in the MLCT group; Enterobacteriaceae, Escherichia, and Allobaculum in the 2′-FL group; Bifidobacterium, Romboutsia, Clostridia, and several other bacterial taxa in the MLCT + 2′-FL group. Conclusions: These results indicate that MLCT and 2′-FL interventions alone appear to provide different benefits for small intestinal development, and their combination may confer more comprehensive advantages. Full article
(This article belongs to the Section Prebiotics and Probiotics)
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28 pages, 17610 KB  
Article
Histological Assessment of Intestinal Changes Induced by Liquid Whey-Enriched Diets in Pigs
by Kamel Mhalhel, Mauro Cavallaro, Lidia Pansera, Leyanis Herrera Ledesma, Maria Levanti, Antonino Germanà, Anna Maria Sutera, Giuseppe Tardiolo, Alessandro Zumbo, Marialuisa Aragona and Giuseppe Montalbano
Vet. Sci. 2025, 12(8), 716; https://doi.org/10.3390/vetsci12080716 - 30 Jul 2025
Viewed by 1125
Abstract
Liquid whey (LW) is a nutrient-rich dairy by-product and a promising resource for animal nutrition. However, data regarding its impact on intestinal morphology and endocrine signaling are limited. Therefore, the current study aims to dissect those aspects. An experiment was conducted on 14 [...] Read more.
Liquid whey (LW) is a nutrient-rich dairy by-product and a promising resource for animal nutrition. However, data regarding its impact on intestinal morphology and endocrine signaling are limited. Therefore, the current study aims to dissect those aspects. An experiment was conducted on 14 crossbred pigs divided into control (fed 3% of their body weight pelleted feed) and LW (fed 3% of their body weight supplemented with 1.5 L of LW) groups. The results show a significantly increased body weight gain in LW pigs during the second half of the experiment. Moreover, an increased ileal villus height, deeper crypts, and a thicker muscularis externa in the duodenum and jejunum have been reported in LW-fed pigs. Goblet cell count revealed a significant abundance of these cells in duodenal villi and jejunal crypts of the LW group, suggesting enhanced mucosal defense in all segments of LW-fed pigs. While Cholecystokinin8 and Galanin showed the same expression pattern among both groups and SI segments, the leptin expression was significantly higher in LW swine. These findings indicate that LW promotes growth, gut mucosa remodeling, and neuroendocrine signaling, thus supporting LW use as a functional dietary strategy with attention to the adaptation period. Full article
(This article belongs to the Section Anatomy, Histology and Pathology)
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13 pages, 652 KB  
Article
Evaluation of Alterations in Nutrient Utilization and Intestinal Health in Response to Heat Stress in Pekin Ducks Based on a Pair-Feeding Experimental Design
by Xiangyi Zeng, Arshad Javid, Gregory S. Fraley, Gang Tian, Keying Zhang, Shiping Bai, Xuemei Ding, Jianping Wang, Yan Liu, Yue Xuan, Shanshan Li and Qiufeng Zeng
Animals 2025, 15(15), 2213; https://doi.org/10.3390/ani15152213 - 28 Jul 2025
Viewed by 410
Abstract
The objective of this study was to investigate alterations in nutrient utilization, standardized ileal digestibility of amino acids (SIDAA), and intestinal health in response to heat stress (HS) in Pekin ducks. A total of 240 healthy 28-day-old male Pekin ducks were randomly allocated [...] Read more.
The objective of this study was to investigate alterations in nutrient utilization, standardized ileal digestibility of amino acids (SIDAA), and intestinal health in response to heat stress (HS) in Pekin ducks. A total of 240 healthy 28-day-old male Pekin ducks were randomly allocated to three groups: a normal control (NC) group, an HS group, and a pair-fed (PF; provided an amount of feed equal to that consumed by the HS group to eliminate the effects of feed intake) group, each with eight replicate cages of ten birds. The results showed that HS significantly reduced the apparent utilization of dietary energy, ether extract, and crude protein compared to both the NC and PF groups (p < 0.05), but yielded comparable SIDAA to the PF group. The HS group exhibited reduced mRNA levels of EAAT3 and PepT1, along with elevated mRNA levels of CAT1, GLUT5, and FATP6 in the jejunum compared to the NC or PF groups, respectively (p < 0.05). Furthermore, HS resulted in a significant deterioration of jejunal morphology and goblet cell count compared to the NC and PF groups (p < 0.05). Serum fluorescein isothiocyanate-dextran levels were significantly higher in HS ducks than in NC ducks (p < 0.05), but did not differ from PF ducks. At order-level classification of ileal mucosal microbiota, HS markedly increased the relative abundance of Bacillales, Deferribacterales, and Actinomycetales versus NC (p < 0.05), while significantly decreasing Bifidobacteriales abundance relative to PF (p < 0.05). Collectively, HS induces a leaky gut and microbiota dysbiosis that compromises gut health, thereby reducing dietary nutrient utilization in Pekin ducks. The observed reduction in feed intake constitutes a primary driver of intestinal health deterioration in heat-stressed Pekin ducks. Full article
(This article belongs to the Section Poultry)
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22 pages, 3902 KB  
Article
Comparative Immunomodulatory Efficacy of Secukinumab and Honokiol in Experimental Asthma and Acute Lung Injury
by Andrei Gheorghe Vicovan, Diana Cezarina Petrescu, Lacramioara Ochiuz, Petru Cianga, Daniela Constantinescu, Elena Iftimi, Mariana Pavel-Tanasa, Codrina Mihaela Ancuta, Cezar-Cătălin Caratașu, Mihai Glod, Carmen Solcan and Cristina Mihaela Ghiciuc
Pharmaceuticals 2025, 18(8), 1108; https://doi.org/10.3390/ph18081108 - 25 Jul 2025
Viewed by 357
Abstract
Background: The study evaluates the immunomodulatory potential of secukinumab (SECU) and honokiol (HONK) in a murine model of allergic asthma complicated by acute lung injury (ALI), with an emphasis on modulating key inflammatory pathways. The rationale is driven by the necessity to attenuate [...] Read more.
Background: The study evaluates the immunomodulatory potential of secukinumab (SECU) and honokiol (HONK) in a murine model of allergic asthma complicated by acute lung injury (ALI), with an emphasis on modulating key inflammatory pathways. The rationale is driven by the necessity to attenuate Th17-mediated cytokine cascades, wherein IL-17 plays a critical role, as well as to explore the adjunctive anti-inflammatory effects of HONK on Th1 cytokine production, including IL-6, TNF-α, and Th2 cytokines. Methods: Mice were sensitized and challenged with ovalbumin (OVA) and lipopolysaccharide (LPS) was administrated to exacerbate pulmonary pathology, followed by administration of SECU, HONK (98% purity, C18H18O2), or their combination. Quantitative analyses incorporated OVA-specific IgE measurements, differential cell counts in bronchoalveolar lavage fluid (BALF), and extensive cytokine profiling in both BALF and lung tissue homogenates, utilizing precise immunoassays and histopathological scoring systems. Results: Both SECU and HONK, when used alone or in combination, display significant immunomodulatory effects in a murine model of allergic asthma concomitant with ALI. The combined therapy synergistically reduced pro-inflammatory mediators, notably Th1 cytokines, such as TNF-α and IL-6, as measured in both BALF and lung tissue homogenates. Conclusions: The combined therapy showed a synergistic attenuation of pro-inflammatory mediators, a reduction in goblet cell hyperplasia, and an overall improvement in lung histoarchitecture. While the data robustly support the merit of a combinatorial approach targeting multiple inflammatory mediators, the study acknowledges limitations in cytokine diffusion and the murine model’s translational fidelity, thereby underscoring the need for further research to optimize clinical protocols for severe respiratory inflammatory disorders. Full article
(This article belongs to the Section Pharmacology)
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11 pages, 217 KB  
Article
Dietary Fermented Rapeseed Meal During the Grower Period Affects Growth Performance, Intestinal Health, and Antioxidant Status in Sansui Ducks
by Yulong Feng, Meijuan Li, Yuxi Lu, Chengcheng Tian, Yu Zhao, Jianwei Li, Zhiguo Wen and Yongwen Zhu
Animals 2025, 15(14), 2078; https://doi.org/10.3390/ani15142078 - 14 Jul 2025
Viewed by 294
Abstract
The aim was to investigate effects of various proportions (0 to 20%) of fermented rapeseed meal (FRSM) on performance, intestinal health, and antioxidant status in Sansui ducks (Sansui Sheldrake ducks). A total of 350 male ducklings, 15 d old, were allocated into [...] Read more.
The aim was to investigate effects of various proportions (0 to 20%) of fermented rapeseed meal (FRSM) on performance, intestinal health, and antioxidant status in Sansui ducks (Sansui Sheldrake ducks). A total of 350 male ducklings, 15 d old, were allocated into five dietary treatments with seven replicate pens of 10 birds per pen. The starter diets had 0, 5, 10, 15, or 20% FRSM that contained 0, 1.08, 2.17, 3.25, or 4.34 µmol glucosinolates (GLS/g of complete feed, respectively, fed from d 15 to d 35. The average daily feed intake (ADFI) and feed conversion ratio (FCR) from d 15 to 35 increased linearly with the dietary FRSM inclusion, with the ducks fed 15 or 20% FRSM diets having higher (p < 0.05) ADFIs and FCRs than the ducks fed 0% FRSM. The dietary FRSM inclusion levels of up to 15% were accompanied by decreased catalase (CAT) and antioxidant capacity (AOC) activities in the livers and jejunum of the ducks at d 35. In addition, the 20% FRSM (4.34 µmol GLS/g diet) decreased the villus height, crypt depth, muscular thickness, and goblet cell counts in the jejunum and ileum. In conclusion, 15 or 20% dietary FRSM (3.25 or 4.34 µmol GLS/g diet) during the grower period in Sansui ducks decreased feed efficiency, disrupted hepatic antioxidant balance, and impaired intestinal morphology and structure. The FRSM inclusion of ≥15% (3.25 µmol glucosinolates/g) impaired feed efficiency and antioxidant activity, while the 20% FRSM (4.34 µmol glucosinolates/g) induced intestinal damage in the growing Sansui ducks. Full article
(This article belongs to the Special Issue Alternative Protein Sources for Animal Feeds)
20 pages, 2936 KB  
Article
Effects of Lactobacillus plantarum-81-Fermented Feed on Growth and Intestinal Health of Muscovy Ducks
by Zhaolong Li, Song Peng, Mengshi Zhao, Xiaodong Zhuang, Huini Wu, Tiecheng Sun and Fengqiang Lin
Fermentation 2025, 11(6), 311; https://doi.org/10.3390/fermentation11060311 - 29 May 2025
Viewed by 852
Abstract
Feed fermented by various strains of Lactobacillus plantarum (LP) produces distinct biologically active substances. This study systematically evaluates the growth performance, gut microbiota modulation, and immune response parameters in Muscovy ducks fed with LP81-fermented diets (LP81-FF) compared to conventional regimens. Our findings demonstrate [...] Read more.
Feed fermented by various strains of Lactobacillus plantarum (LP) produces distinct biologically active substances. This study systematically evaluates the growth performance, gut microbiota modulation, and immune response parameters in Muscovy ducks fed with LP81-fermented diets (LP81-FF) compared to conventional regimens. Our findings demonstrate that LP81-FF elicits dose-dependent improvements in Muscovy duck production parameters. Through a 70-day feeding trial, LP81-FF administration reduced feed intake by 3.1% and improved the average daily gain (ADG) and feed conversion ratio (FCR) by 9.18% and 6.65% (p < 0.05) compared to conventional feed. Systemic antioxidant capacity analysis revealed 25.99% elevation in total antioxidant capacity (T-AOC) (p < 0.05), accompanied by 14.37% and 30.79% increases in serum IgG and IgM levels, respectively. Immune organ indices showed dose-responsive enhancement, with the high-dose group (HD) achieving 47.27% and 28.92% increases in thymus and bursa of Fabricius indices (p < 0.05). Additionally, 16S rRNA sequencing revealed that LP81-FF optimized the intestinal microbial community structure of Muscovy ducks by promoting the abundance of Bacteroides, Butyricicoccus, and Ruminococcus (beneficial bacteria) (p < 0.05), while inhibiting the increase of Escherichia-Shigella and Rothia (harmful bacteria). It also promoted the secretion of beneficial metabolites such as Glutaric acid and 2,6-Diaminohexanoic acid in the intestine, inhibited the production of harmful substances dominated by Fexofenadine, and enhanced the strength of physical barrier-related factors such as intestinal mucosa villi and goblet cell count. These multi-omics insights establish that LP81-FF enhances growth performance through coordinated modulation of gut–liver axis homeostasis, mucosal immunity activation, and microbial-metabolic network optimization. Our results position LP81-FF as a sustainable alternative to antibiotic growth promoters in waterfowl production systems. Full article
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25 pages, 2707 KB  
Article
Beneficial Effects of Traditional Fermented Soybean Sauce (Kanjang) on Memory Function, Body Water, and Glucose Metabolism: Roles of Gut Microbiota and Neuroinflammation
by Yu Yue, Hee-Jong Yang, Chen Li, Myeong-Seon Ryu, Ji-Won Seo, Do Youn Jeong and Sunmin Park
Nutrients 2025, 17(10), 1617; https://doi.org/10.3390/nu17101617 - 8 May 2025
Cited by 1 | Viewed by 1032
Abstract
Background: Traditional fermented soybean foods, acting as potential synbiotics, may help mitigate cognitive impairment associated with amnesia. This study investigated the neuroprotective effects of four kanjang (Korean fermented soy sauce) varieties and their underlying mechanisms. Methods: Male Sprague Dawley rats (n = 70) [...] Read more.
Background: Traditional fermented soybean foods, acting as potential synbiotics, may help mitigate cognitive impairment associated with amnesia. This study investigated the neuroprotective effects of four kanjang (Korean fermented soy sauce) varieties and their underlying mechanisms. Methods: Male Sprague Dawley rats (n = 70) were divided into seven groups: normal control, scopolamine control, positive control (1 mg/kg bw/day of donepezil), and four scopolamine-treated groups receiving different kanjang varieties (0.5% in high-fat diet). Based on their Bacillus content, the kanjang samples were categorized as traditionally made kanjang (TMK) with high Bacillus (SS-HB), TMK with medium Bacillus (SS-MB), TMK with low Bacillus (SS-LB), and factory-made kanjang (SS-FM). Results: Scopolamine administration disrupted energy, glucose, and water metabolism and impaired memory function (p < 0.05). All kanjang treatments improved insulin sensitivity, reduced inflammation, enhanced glucose tolerance, and decreased visceral fat. SS-MB, SS-HB, and SS-FM increased skeletal muscle mass. They maintained body water homeostasis by suppressing the renin–angiotensin–aldosterone system. Kanjang treatments improved memory function, with SS-FM showing the least significant effects. The treatments reduced neuronal cell death in the hippocampal CA1 region, decreased acetylcholinesterase activity, and increased brain-derived neurotrophic factor mRNA expression. Gut microbiota analysis revealed that kanjang treatments increased Lactobacillaceae and decreased Lachnospiraceae, with SS-HB and SS-LB specifically elevating Ligilactobacillus. Metagenomic analysis demonstrated enhanced glycolysis/gluconeogenesis pathways and enhanced butanoate metabolism while reducing lipopolysaccharide biosynthesis and pro-inflammatory signaling. SS-MB and SS-LB increased intestinal goblet cell counts and the serum butyrate concentration. Conclusions: These findings suggest that kanjang consumption, particularly SS-HB and SS-LB varieties, can ameliorate memory impairment in this murine model through multiple mechanisms: metabolic improvements, enhanced neurotrophic signaling, gut microbiota modulation, and reduced neuroinflammation via gut–brain axis activation. Human clinical trials are warranted to determine if these promising neuroprotective effects translate to clinical applications. Full article
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17 pages, 2037 KB  
Article
Effects of Fermented Soybean Meal Replacing Fishmeal and Adding Lentinus edodes Fermentation Supplementation on Japanese Eel (Anguilla japonica) Cultivated in Pond Cage
by Jie Yu, Fei Xiao, Qian Xiao, Dongming Chen, Guoyong Zhou, Huanbin Jiang, Xiaoya Fan, Herong Shi and Huihong Zhao
Fishes 2025, 10(4), 180; https://doi.org/10.3390/fishes10040180 - 16 Apr 2025
Viewed by 901
Abstract
Replacing fishmeal (FM) with plant-based protein sources remains a significant challenge, particularly for carnivorous fish. This study investigates the effect of dietary Lentinus edodes fermentation (LEF) supplementation on Japanese eel (Anguilla japonica) fed with fermented soybean meal (FSM) as a partial [...] Read more.
Replacing fishmeal (FM) with plant-based protein sources remains a significant challenge, particularly for carnivorous fish. This study investigates the effect of dietary Lentinus edodes fermentation (LEF) supplementation on Japanese eel (Anguilla japonica) fed with fermented soybean meal (FSM) as a partial FM replacement. The positive control consisted of 64% FM (Con), and the negative control (FSM group) included 52% FM plus 12% FSM. Two experimental diets were formulated by adding 2% LEF (LEF2 group) and 3% LEF (LEF3 group) to the negative control diet. The experimental diet was administered to Japanese eels weighing 62.50 ± 2.14 g for 12 weeks. The experimental fish were randomly assigned to four groups, with three replicates of 100 fish per group. The results indicated that growth performance and feed efficiency were significantly reduced in the FSM group, but were significantly improved by LEF supplementation (p < 0.05). LEF supplementation did not significantly affect muscle crude fat and protein content compared to the FSM group (p > 0.05), but significantly increased muscle amino acid content and levels of certain fatty acids (linoleic acid, γ-linolenic acid, eicosatrienoic acid, DHA) (p < 0.05). LEF supplementation reduced serum TC and LDL-C levels, increased HDL-C levels, significantly increased CAT and T-SOD activities, and reduced MDA levels in both serum and liver (p < 0.05). ALT and AST activities were significantly elevated in the FSM group, accompanied by liver histological abnormalities, which were improved by LEF supplementation. LEF supplementation increased the thickness of the muscularis, villus height, and goblet cell count in the intestine (p < 0.05). Compared to the control, the FSM group significantly upregulated spleen tnf-α gene expression and downregulated the expression of anti-inflammatory factors (ifn-α, ifn-γ, socs1, mavs). LEF supplementation ameliorated the reduced immunocompetence induced by FM replacement with FSM by enhancing the expression of immune-related genes (irak4, ifn-α, ifn-γ, irf3, irf11, socs1, mavs, traf3) in the spleen. These results suggest that the beneficial effects of LEF supplementation on growth performance and feed efficiency may be attributed to its improvement of liver damage and intestinal histology, as well as its enhancement of antioxidant capacity and immunity. Full article
(This article belongs to the Special Issue Pivotal Roles of Feed Additives for Fish)
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15 pages, 1153 KB  
Article
Dietary Glyceryl Polyethylene Glycol Ricinoleate as an Additive to Improve Intestinal Health in Post-Weaning Piglets
by Julieta M. Decundo, Susana N. Dieguez, Guadalupe Martínez, Fabián A. Amanto, María L. Maté, Juan P. Lirón, Denisa S. Pérez Gaudio, Carolina P. Bianchi, Aurélie Montagnon and Alejandro L. Soraci
Animals 2025, 15(7), 983; https://doi.org/10.3390/ani15070983 - 29 Mar 2025
Viewed by 925
Abstract
Early weaning in intensive pig production induces stress, compromising gastrointestinal health. Poor fat digestion results from the piglets’ underdeveloped digestive system. Dietary emulsifiers can enhance fat utilization, and glyceryl polyethylene glycol ricinoleate (GPGR) has been shown to improve pig performance. This study evaluated [...] Read more.
Early weaning in intensive pig production induces stress, compromising gastrointestinal health. Poor fat digestion results from the piglets’ underdeveloped digestive system. Dietary emulsifiers can enhance fat utilization, and glyceryl polyethylene glycol ricinoleate (GPGR) has been shown to improve pig performance. This study evaluated GPGR’s effects on intestinal health in weaned piglets in a commercial production farm. A total of 380 just weaned (21 days old) piglets were divided in two groups of 190 animals each (in four replicates) that received either a basal diet (control) or a basal diet + 350 g/ton GPGR pharmaceutical formulation as top dress. Blood samples were collected at pre-established days, and intestinal sampling occurred 15 days post-weaning. Plasma cortisol, citrulline, intestinal morphology, mucus quality, enzymatic activity, volatile fatty acids (VFAs), and cecal microbiota were analyzed. GPGR did not alter plasma cortisol but increased citrullinemia (P: 0.024), suggesting greater enterocyte functional mass. GPGR piglets showed improved intestinal morphology (greater villus height, villus height:crypt depth ratio, and intestinal absorption area, p < 0.05) and higher enzymatic maltase activity (p ≤ 0.014). VFAs, bacterial adherence to mucus, and goblet cell counts were unaffected. Dietary GPGR increased Firmicutes and Actinobacteria (P: 0.014 and P: 0.045, respectively) while reducing Proteobacteria (p < 0.001). In conclusion, dietary GPGR promotes intestinal health in weaned piglets by improving epithelial structure, digestive function, and microbiota balance, representing a promising strategy to support piglets in overcoming the early nursery phase. Full article
(This article belongs to the Special Issue Gastrointestinal Tract Health in Pigs—2nd Edition)
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20 pages, 3877 KB  
Article
An Evaluation of Soybean Protein Concentrate as a Replacement for Fish Meal with Methionine Supplementation in Diets for Hybrid Sturgeon (Acipenser baerii ♀ × A. schrenckii ♂)
by Zhaolin Li, Kai Xie, Jiufeng Gu, Xinyu Li, Yong Shi, Junzhi Zhang, Yi Hu and Xuezhi Zhu
Animals 2025, 15(6), 787; https://doi.org/10.3390/ani15060787 - 10 Mar 2025
Viewed by 1057
Abstract
Soy protein concentrate (SPC) is a cost-effective alternative to fish meal (FM) in aquaculture, but its deficiency in essential amino acids, particularly methionine, limits its application. This study evaluated the effects of methionine supplementation on growth, liver and intestinal health, and muscle quality [...] Read more.
Soy protein concentrate (SPC) is a cost-effective alternative to fish meal (FM) in aquaculture, but its deficiency in essential amino acids, particularly methionine, limits its application. This study evaluated the effects of methionine supplementation on growth, liver and intestinal health, and muscle quality in hybrid sturgeon (Acipenser baerii ♀ × A. schrenckii ♂) fed SPC-based diets. Four diets were formulated: an FM control diet, and SPC diets supplemented with 0% (M0), 0.25% (M2.5), and 0.50% (M5) methionine. Replacing FM with SPC without methionine (M0) significantly reduced weight gain and the protein efficiency ratio (PER) while increasing the feed conversion ratio (FCR) and hepatic lipid accumulation. Methionine supplementation (M5) restored growth performance, the PER, and muscle texture to levels comparable to the FM group. Intestinal enzyme activities (lipase and trypsin), villus height, and goblet cell counts significantly improved in the M5 group. Gene expression analysis showed that M5 upregulated tight junction genes (claudin1, occludin) and anti-inflammatory genes (tgfβ, lysozyme) while reducing pro-inflammatory cytokines (il1β, il8). In the liver, M5 reduced oxidative stress markers such as malondialdehyde (MDA) and improved antioxidant enzyme activities (SOD, CAT) while optimizing lipid metabolism, as evidenced by lower triglyceride (TG) and total cholesterol (TC) levels. Muscle quality analysis showed that M5 significantly increased muscle hardness, chewiness, and fiber density compared to M0. In conclusion, methionine supplementation at 0.50% effectively mitigates the negative effects of SPC, improving growth, liver and intestinal health, and muscle quality in hybrid sturgeon. Full article
(This article belongs to the Section Aquatic Animals)
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16 pages, 4008 KB  
Article
Amonabactin Synthetase G Regulates Aeromonas hydrophila Pathogenicity Through Modulation of Host Wnt/β-catenin Signaling
by Yiyang Tang, Xiaofeng Liu, Chuyi Zeng, Yujun Liu, Ye Yang, Jiayi Hu, Pingyuan Li and Zejun Zhou
Vaccines 2025, 13(2), 195; https://doi.org/10.3390/vaccines13020195 - 17 Feb 2025
Viewed by 887
Abstract
Background/Objectives: Aeromonas hydrophila is a significant opportunistic pathogen with a broad host range. It produces a catecholate siderophore, amonabactin, during iron starvation, but the in vivo infection mechanism that involves amonabactin is unclear. This study aims to elucidate the role of amonabactin synthetase [...] Read more.
Background/Objectives: Aeromonas hydrophila is a significant opportunistic pathogen with a broad host range. It produces a catecholate siderophore, amonabactin, during iron starvation, but the in vivo infection mechanism that involves amonabactin is unclear. This study aims to elucidate the role of amonabactin synthetase G (AmoG) in the pathogenicity of A. hydrophila and its impact on gut barrier function. Methods: ΔAmoG was generated by deleting the AMP-binding domain of AmoG in A. hydrophila CCL1. In vivo infection experiments were conducted to assess the mutant’s iron-chelating ability and pathogenicity. Complementation of ΔAmoG with AmoG (ΔAmoG-C) was performed to confirm the observed phenotypes. Transcriptomic and qRT-PCR analyses were used to investigate gene expression changes in infected fish. Goblet cell counts, tight junction expression, and D-lactic acid and LPS levels were measured to evaluate gut barrier function. Results: ΔAmoG exhibited impaired iron-chelating ability and reduced pathogenicity compared to wild-type CCL1. Complementation with AmoG restored virulence in ΔAmoG-C. Transcriptomic and qRT-PCR analyses revealed an elevated expression of Wnt/β-catenin pathway components and antimicrobial genes in ΔAmoG-infected fish. Further investigation indicated increased goblet cells and an enhanced expression of tight junctions, as well as lower D-lactic acid and LPS levels, in ΔAmoG-infected fish. However, gut permeability, bacterial load, and lethality did not significantly differ between CCL1, ΔAmoG, and ΔAmoG-C infections when the Wnt/β-catenin pathway was activated. Conclusions: AmoG plays a crucial role in A. hydrophila pathogenicity by modulating host Wnt/β-catenin signaling and gut mucosal barrier function. This study provides insights into the pathogenesis of A. hydrophila and potential therapeutic targets. Full article
(This article belongs to the Special Issue Fish Disease Occurrence and Immune Prevention and Control)
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22 pages, 1623 KB  
Article
Dietary Plant-Based Mixture Improves Feed Efficiency, Gross Profit, Physiological Performance, Gene Expression and Gut Health of Nile Tilapia (Oreochromis niloticus)
by Abdel-Fattah M. El-Sayed, Mahougnon Simeon Fagnon, Amira M. Hamdan, Thibaut Chabrillat, Sylvain Kerros and Salma M. S. Zeid
Biology 2025, 14(2), 186; https://doi.org/10.3390/biology14020186 - 11 Feb 2025
Viewed by 1811
Abstract
The goal of this study was to evaluate the effect of the supplemental plant-based blend Phyto AquaNity (PAN) on growth, profitability and health status of Nile tilapia (O. niloticus) cultured in hapas. Juvenile fish of average weight 73 g were stocked [...] Read more.
The goal of this study was to evaluate the effect of the supplemental plant-based blend Phyto AquaNity (PAN) on growth, profitability and health status of Nile tilapia (O. niloticus) cultured in hapas. Juvenile fish of average weight 73 g were stocked in 2-m3 hapas in triplicates at a density of 20 fish m−3 (40 fish hapa−1). Four extruded diets were formulated following isonitrogenous (30% CP), isoenergetic (17 MJ kg−1) standards, with incorporation levels of 0, 0.25, 0.50, or 1.00 g of PAN kg−1 diet. Fish were fed the experimental diets at a daily rate of 2–3% of their body weight (BW) over 80 days. From this study, results showed that growth performance and tissue composition were not significantly impacted by these treatments. Feed intake exhibited a significant reduction while feed efficiency was improved in the groups fed 0.5 g kg−1. Diets supplemented with PAN were also more profitable than the control diet, with 0.5 g kg−1 indicating the highest return (9.24% increase). Digestive enzyme activity and hepatic enzyme activity were significantly improved with an increase in the level of PAN up to 0.50 g kg−1. In addition, immune parameters (lysozyme activity, alternative complement and phagocytic cells) and antioxidant enzymes (superoxide dismutase, glutathione peroxidase and catalase) were significantly enhanced with increasing PAN level up to 0.5 g kg−1 (p < 0.05). Gene expression of cytokines was also upregulated in fish fed with PAN at levels of up to 0.5 g kg−1 (p < 0.05). Moreover, the results showed that higher levels of PAN promoted the growth of beneficial bacteria while reducing the load of pathogenic bacteria. Additionally, intestinal fold length and goblet cell count were significantly increased in the group fed PAN up to 0.5 g kg−1. A quadratic regression analyses performed on feed efficiency, profitability, hepatic enzyme activity and gut microbial load revealed that 0.60–0.65 g kg−1 of feed were the optimal dosages. Regarding immunological and antioxidant responses, the optimal dosages ranged between 0.75 and 0.85 g kg−1. Overall, about 0.60–0.85 g PAN kg−1 feed is suggested for optimum performance, profitability, gut health and overall health status of Nile tilapia, depending on the target objective for which this product is added. Full article
(This article belongs to the Special Issue Mechanisms of Immunity and Disease Resistance in Aquatic Animals)
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26 pages, 4136 KB  
Article
Impact of Autolysed Brewer’s Yeast and Soluble Dried Yeast Extract on Growth Performance and Mucosal Health of Atlantic Salmon (Salmo salar) Parr
by Sheu G. Odu-Onikosi, Taofik A. Momoh, Sherilyn T. Abarra, Noah E. Wood, Folasade D. Amulejoye, Matthew Emery, Glenn M. Harper, Benjamin Eynon, Victor Kuri, Holger Kühlwein and Daniel L. Merrifield
Animals 2025, 15(3), 323; https://doi.org/10.3390/ani15030323 - 23 Jan 2025
Cited by 1 | Viewed by 1505
Abstract
Yeast-based feed additives have emerged as promising functional feed additives (FFAs) to promote sustainable aquaculture development through enhanced gut health and immune modulation in fish. The present study evaluated the impact of autolysed brewer’s yeast (ABY) and soluble dried yeast extract (SDYE) in [...] Read more.
Yeast-based feed additives have emerged as promising functional feed additives (FFAs) to promote sustainable aquaculture development through enhanced gut health and immune modulation in fish. The present study evaluated the impact of autolysed brewer’s yeast (ABY) and soluble dried yeast extract (SDYE) in improving the intestinal and skin histology, immune response, and intestinal microbiome of Atlantic salmon parr (Salmo salar) over a 9-week feeding trial. Three experimental diets were produced: a control diet, a diet supplemented with ABY at 2.5 g/kg, and a diet supplemented with SDYE at 2.5 g/kg. These diets were administered to triplicate tanks of Atlantic salmon. The yeast-supplemented diets, especially ABY, improved intestinal mucosal fold length, lamina propria width, microvilli density, and intestinal goblet cell counts, as well as skin goblet cell counts. The yeast additives had no detrimental effects on the fish haematology, with no significant differences in haemoglobin concentration, red blood cell counts, and white blood cell counts among the treatment groups. Gene expression analysis revealed upregulation of il-1β and muc-2 in fish fed the ABY diet, indicating enhanced immune function and potentially mucosal protection. Intestinal microbiota analysis revealed Firmicutes as the most dominant phylum in all groups, followed by Actinobacteriota. Distinct bacterial community shifts were observed between the treatment groups, with a significant increase in the relative abundance of taxa such as Staphylococcus in yeast-supplemented diets and a significant decrease in Streptococcus and Weissella. Collectively, these findings suggest that the yeast additives, especially ABY, enhance gut health and immune function without compromising growth performance. Full article
(This article belongs to the Special Issue Gut Microbiota in Aquatic Animals)
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21 pages, 4112 KB  
Article
Machine Learning-Based Classification of Malnutrition Using Histological Biomarkers of Fish Intestine: Preliminary Data
by Joana Oliveira, Marisa Barata, Florbela Soares, Pedro Pousão-Ferreira, Aires Oliva-Teles and Ana Couto
J. Mar. Sci. Eng. 2024, 12(12), 2177; https://doi.org/10.3390/jmse12122177 - 28 Nov 2024
Cited by 3 | Viewed by 1825
Abstract
The gut is the first organ to contact food, and it is often the target of nutrition studies performed on aquaculture fish. Histological analysis reveals morphological changes in fish intestines caused by ingredients in formulated feeds. However, this type of analysis is mainly [...] Read more.
The gut is the first organ to contact food, and it is often the target of nutrition studies performed on aquaculture fish. Histological analysis reveals morphological changes in fish intestines caused by ingredients in formulated feeds. However, this type of analysis is mainly based on a semi-quantitative approach, often restricted to specialized researchers, and may provide inconsistent results between studies. This study addresses these limitations by combining semi-quantitative and quantitative features to characterize the anterior, intermediate, and distal sections of the intestine of meagre (Argyrosomus regius) subjected to different nutritional status. Collected data were used to build machine learning models, select the most accurate ones, and identify key features for predicting malnutrition. Logistic regression, support vector machines, and ensemble stacking performed best across all intestinal sections. Combining semi-quantitative and quantitative features yielded the best predictions, with villi number, density and area, and goblet cell count being the most crucial for the classification task. When considering the distal intestine alone, semi-quantitative features outperformed quantitative ones. The intermediate section of the intestine showed the best model accuracy, indicating higher sensitivity to nutritional changes. These results demonstrate the potential of machine learning models to streamline histomorphological analyses to evaluate nutritional status, making them more accessible and standard across users. Full article
(This article belongs to the Special Issue New Challenges in Marine Aquaculture Research—2nd Edition)
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16 pages, 3549 KB  
Article
Isatidis Folium Represses Dextran Sulfate Sodium-Induced Colitis and Suppresses the Inflammatory Response by Inhibiting Inflammasome Activation
by You Chul Chung, Ami Lee, Chan Ho Jang, Jin Ah Ryuk, Hyunil Ha and Youn-Hwan Hwang
Nutrients 2024, 16(19), 3323; https://doi.org/10.3390/nu16193323 - 30 Sep 2024
Cited by 2 | Viewed by 1878
Abstract
Background/Objectives: Isatidis Folium (IF) has been used in traditional medicine for various ailments, and recent research highlights its anti-inflammatory, antiviral, and detoxifying properties. This study investigated the anti-inflammatory effects of a hydroethanolic extract of IF (EIF) on inflammasomes and colitis. Methods: Dextran sulfate [...] Read more.
Background/Objectives: Isatidis Folium (IF) has been used in traditional medicine for various ailments, and recent research highlights its anti-inflammatory, antiviral, and detoxifying properties. This study investigated the anti-inflammatory effects of a hydroethanolic extract of IF (EIF) on inflammasomes and colitis. Methods: Dextran sulfate sodium (DSS)-induced colitis model C57BL/6 mice were treated with DSS, mesalamine, or EIF (200 mg/kg). Parameters such as daily disease activity index (DAI), spleen weight, colon length, and histopathology were evaluated. Intestinal fibrosis, mucin, and tight junction proteins were assessed using Masson’s trichrome, periodic acid–Schiff, and immunohistochemistry staining. RAW264.7 and J774a.1 macrophages were treated with EIF and lipopolysaccharide, with cell viability assessed via the cell counting kit-8 assay, nitric oxide (NO) production with Griess reagent, and cytokine levels with the enzyme-linked immunosorbent assay. NF-κB inhibition was analyzed using the luciferase assay, and phytochemical analysis was performed using UPLC-MS/MS. Results: EIF mitigated weight loss, reduced DAI scores, prevented colon shortening, and attenuated mucosal damage, fibrosis, and goblet cell loss while enhancing the tight junction protein occludin. The anti-inflammatory effects of EIF in RAW264.7 cells included reduced NO production, pro-inflammatory cytokines, and NF-κB activity, along with inhibition of NLRP3 inflammasome responses in J774a.1 cells. The key constituents identified were tryptanthrin, indigo, and indirubin. Conclusions: Animal studies demonstrated the efficacy of EIF in alleviating colitis, suggesting its potential for treating inflammatory diseases. Full article
(This article belongs to the Section Nutritional Immunology)
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