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Activation of skeletal carbohydrate-response element binding protein(ChREBP)-mediated de novo lipogenesis increases intramuscular fat content in chickens

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animal Nutrition 2024年第3期18卷 107-118页

作者： Peng Wang Haihan Xiao Tian Wu Qinghua Fu Xudong Song Yameng Zhao Yan Li Jieping Huang Ziyi Song Guangxi Key laboratory of animal Breeding Disease Control and PreventionCollege of Animal Science and TechnologyGuangxi UniversityNanningGuangxi 530004China

The intracellular lipids in muscle cells of farm animals play a crucial role in determining the overall intramuscular fat(IMF)content,which has a positive impact on meat ***,the mechanisms underlying the deposition of lipids in muscle cells of farm animals are not yet fully *** purpose of this study was to determine the roles of carbohydrate-response element binding protein(ChREBP)and fructose in IMF deposition of *** virus-mediated ChREBP overexpression in tibialis anterior(TA)muscle of chickens,seven 5-d-old male yellow-feather chickens were *** 10 d after virus injection,the chickens were slaughtered to obtain TA muscles for *** fructose administration trial,sixty 9-wk-old male yellow-feather chickens were randomly divided into 2 groups,with 6 replicates per group and 5 chickens per *** chickens were fed either a basal diet or a basal diet supplemented with 10%fructose(purity≥99%).At 4 wk later,the chickens were slaughtered,and breast and thigh muscles were collected for *** results showed that the skeletal ChREBP mRNA levels were positively associated with IMF content in multiple species,including the chickens,pigs,and mice(P<0.05).ChREBP overexpression increased lipid accumulation in both muscle cells in vitro and the TA muscles of mice and chickens in vivo(P<0.05),by activation of the de novo lipogenesis(DNL)***,activation of ChREBP by dietary fructose administration also resulted in increased IMF content in mice and notably chickens(P<0.05).Furthermore,the lipidomics analysis revealed that ChREBP activation altered the lipid composition of chicken IMF and tented to improve the flavor profile of the *** conclusion,this study found that ChREBP plays a pivotal role in mediating the deposition of fat in chicken muscles in response to fructose-rich diets,which provides a novel strategy for improving meat quality in the livestock industry.

关键词： Chicken Meat quality Intramuscular fat Carbohydrate-response element binding protein Fructose

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Nutrition, gastrointestinal microorganisms and metabolites in mastitis occurrence and control

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animal Nutrition 2024年第2期17卷 220-231页

作者： Yue Wang Yiguang Zhao Xiangfang Tang Xuemei Nan Linshu Jiang Hui Wang Jun Liu Liang Yang Junhu Yao Benhai Xiong State Key laboratory of animal Nutrition and Feeding Institute of Animal Science Chinese Academy of Agricultural Sciences College of animal Science and Technology Northwest A&F University Beijing Key laboratory for Dairy Cow Nutrition Beijing University of Agriculture Langfang Academy of Agriculture and Forestry

Mastitis affects almost all mammals including humans and dairy cows. In the dairy industry, bovine mastitis is a disease with a persistently high incidence, causing serious losses to the health of cows, the quality of dairy products, and the economy of dairy farms. Although local udder infection caused by the invasion of exogenous pathogens into the mammary gland was considered the main cause of mastitis,evidence has been established and continues to grow, showing that nutrition factors and gastrointestinal microbiome(GM) as well as their metabolites are also involved in the development of mammary inflammatory response. Suboptimal nutrition is recognized as a risk factor for increased susceptibility to mastitis in cattle, in particular the negative energy balance. The majority of data regarding nutrition and bovine mastitis involves micronutrients. In addition, the dysbiotic GM can directly trigger or aggravate mastitis through entero-mammary gland pathway. The decreased beneficial commensal bacteria, lowered bacterial diversity, and increased pathogens as well as proinflammatory metabolites are found in both the milk and gastrointestinal tract of mastitic dairy cows. This review discussed the relationship between the nutrition(energy and micronutrient levels) and mastitis, summarized the role of GM and metabolites in regulating mastitis. Meanwhile, several non-antibiotics strategies were provided for the prevention and alleviation of mastitis, including micronutrients, probiotics, short-chain fatty acids, highfiber diet, inulin, and aryl hydrocarbon receptor.

关键词： Mastitis Nutrition Gastrointestinal microbiota Metabolite Dairy cow

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Effects of electrolyte balance on intestinal barrier, amino acid metabolism, and mTORC1 signaling pathway in piglets fed lowprotein diets

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animal Nutrition 2024年第2期17卷 408-417页

作者： Qian Lin Xiaodian Tu Xin Li Feiyang Gou Lin Ding Zeqing Lu Jie Feng Yongfei Ying Caihong Hu College of animal Sciences Zhejiang University Key Laboratory of Molecular Animal Nutrition (Zhejiang University) Ministry of Education animal Husbandry Technology Promotion and Breeding Livestock and Poultry Monitoring Station of Zhejiang Province

A proper dietary electrolyte balance(dEB) is essential to ensure optimal growth performance of piglets. In the low-protein diet, this balance may be affected by the reduction of soybean meal and the inclusion of high levels of synthetic amino acids. The objective of this experiment was to evaluate the optimal dEB of low-protein diets and its impact on the growth performance of piglets. A total of 108 piglets(initial age of35 d) were randomly divided into 3 groups with 6 replicates of 6 pigs each as follows: low electrolyte diet(LE group; dEB = 150 milliequivalents [mEq]/kg); medium electrolyte diet(ME group; dEB = 250 m Eq/kg);high electrolyte diet(HE group; d EB = 350 mEq/kg). Results indicated that the LE and HE diet significantly decreased the average daily gain, average daily feed intake, and crude protein digestibility(P < 0.05) in piglets. Meanwhile, LE diets disrupted the structural integrity of the piglets' intestines and decreased jejunal tight junction protein(occludin and claudin-1) expression(P < 0.05). Additionally, the pH and HCO3 in the arterial blood of piglets in the LE group were lower than those in the ME and HE groups(P < 0.05).Interestingly, the LE diet significantly increased lysine content in piglet serum(P < 0.05), decreased the levels of arginine, leucine, glutamic acid, and alanine(P < 0.05), and inhibited the mammalian target of rapamycin complex 1(mTORC1) pathway by decreasing the phosphorylation abundance of key proteins. In summary, the dietary electrolyte imbalance could inhibit the activation of the mTORC1 signaling pathway,which might be a key factor in the influence of the dEB on piglet growth performance and intestinal ***, second-order polynomial(quadratic) regression analysis showed that the optimal dEB of piglets in the low-protein diet was 250 to 265 mEq/kg.

关键词： Low-protein Dietary electrolyte balance Piglet Mammalian target of rapamycin complex 1

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Single‑cell sequencing reveals the reproductive variations between primiparous and multiparous Hu ewes

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Journal of animal Science and Biotechnology 2024年第2期15卷 614-631页

作者： Ting Ge Yifan Wen Bo Li Xiaoyu Huang Shaohua Jiang Enping Zhang Key laboratory of animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100China

Background In the modern sheep production systems,the reproductive performance of ewes determines the economic profitability of *** the genetic mechanisms underlying differences in the litter size is important for the selection and breeding of highly prolific *** sheep,a high-quality Chinese sheep breed,is known for its high fecundity and is often used as a model to study prolificacy *** the current study,animals were divided into two groups according to their delivery rates in three consecutive lambing seasons(namely,the high and low reproductive groups with≥3 lambs and one lamb per season,n=3,respectively).The ewes were slaughtered within 12 h of estrus,and unilateral ovarian tissues were collected and analyzed by 10×Genomics single-cell RNA *** A total of 5 types of somatic cells were identified and corresponding expression profiles were mapped in the ovaries of each ***,the differences in the ovary somatic cell expression profiles between the high and low reproductive groups were mainly clustered in the granulosa ***,four granulosa cell subtypes were *** analysis revealed that the abundance of JPH1 expression and the reduction of LOC101112291 expression could lead to different evolutionary directions of the granulosa ***,the expression levels of FTH1 and FTL in mural granulosa cells of the highly reproductive group were significantly *** genes inhibit necroptosis and ferroptosis of mural granulosa cells,which helps prevent follicular *** This study provides insights into the molecular mechanisms underlying the high fecundity of Hu *** differences in gene expression profiles,particularly in the granulosa cells,suggest that these cells play a critical role in female *** findings also highlight the importance of genes such as JPH1,LOC101112291,FTH1,and FTL in regulating granulosa cell function and follicular development.

关键词： Granulosa cells Hu sheep Lambing number Ovarian somatic cells Single-cell RNA sequencing

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Zinc glycine chelate ameliorates DSS‑induced intestinal barrier dysfunction via attenuating TLR4/NF‑κB pathway in meat ducks

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Journal of animal Science and Biotechnology 2024年第2期15卷 765-778页

作者： Yaqi Chang Ke Wang Guangmang Liu Hua Zhao Xiaoling Chen Jingyi Cai Gang Jia Institute of animal Nutrition Key Laboratory for Animal Disease‑Resistance Nutrition of ChinaMinistry of EducationSichuan Agricultural UniversityChengdu 611130SichuanChina

Background Zinc glycine chelate(Zn-Gly)has anti-inflammation and growth-promoting properties;however,the mechanism of Zn-Gly contribution to gut barrier function in Cherry Valley ducks during intestinal inflammation is ***-hundred 1-day-old ducks were divided into 5 groups(6 replicates and 10 ducks per replicate)in a completely randomized design:the control and dextran sulfate sodium(DSS)groups were fed a corn-soybean meal basal diet,and experimental groups received supplements of 70,120 or 170 mg/kg Zn in form of *** DSS and treatment groups were given 2 mL of 0.45 g/mL DSS daily during d 15–21,and the control group received normal *** experiment lasted 21 *** Compared with DSS group,70,120 and 170 mg/kg Zn significantly increased body weight(BW),villus height and the ratio of villus to crypt,and significantly decreased the crypt depth of jejunum at 21 *** number of goblet cells in jejunal villi in the Zn-Gly group was significantly increased by periodic acid-Schiff *** with control,the content of intestinal permeability marker D-lactic acid(D-LA)and fluxes of fluorescein isothiocyanate(FITC-D)in plasma of DSS group significantly increased,and 170 mg/kg Zn supplementation significantly decreased the D-LA content and FITC-D *** with control,contents of plasma,jejunum endotoxin and jejunum pro-inflammatory factors IL-1β,IL-6 and TNF-αwere significantly increased in DSS group,and were significantly decreased by 170 mg/kg Zn *** Zn significantly increased the contents of anti-inflammatory factors IL-10,IL-22 and sIgA and IgG in ***-time PCR and Western blot results showed that 170 mg/kg Zn supplementation significantly increased mRNA expression levels of CLDN-1 and expression of OCLN protein in jejunum,and decreased gene and protein expression of CLDN-2 compared with DSS *** 120 mg/kg Zn significantly promoted the expressions of IL-22 and *** Zn-Gly supplementation sign

关键词： Cherry Valley ducks Growth performance Gut inflammation Intestinal barrier Zn-Gly

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Multi-omics revealed the mechanism of feed efficiency in sheep by the combined action of the host and rumen microbiota

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animal Nutrition 2024年第3期18卷 367-379页

作者： Guangchen Zhou Junda Li Xuhui Liang Bohua Yang Ximeng He Hongyu Tang Hongran Guo Gongwei Liu Wenyuan Cui Yulin Chen Yuxin Yang Key laboratory of animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100China

This study was conducted to investigate potential regulatory mechanisms of feed efficiency(FE)in sheep by linking rumen microbiota with its host by the multi-omics *** hundred and ninety-eight hybrid female sheep(initial body weight=30.88±4.57 kg;4-month-old)were selected as candidate *** test sheep was fed in an individual pen for 60 days,and the residual feed intake(RFI)was *** ten candidate sheep with the highest RFI were divided into the Low-FE group,and the ten with the lowest RFI were divided into the High-FE group,all selected for sample *** RFI,average daily gain and average daily feed intake were highly significantly different between the two experimental groups(P<0.05).Compared with Low-FE group,the insulin-like growth factor-1 and very low-density lipoprotein in serum and the propionate in rumen significantly increased in High-FE group(P<0.01),but the acetate:propionate ratio in rumen significantly decreased in High-FE group(P¼0.034).Metagenomics revealed Selenomonas ruminantium,Selenomonas *** Faecalibacterium prausnitzii were key bacteria,and increased abundance of the genes encoding the enzymes for cellulose degradation and production of propionate in High-FE *** results of proteomics and section showed the rumen papilla length and expression of carbonic anhydrase and Na^(+)/K^(+)-ATPase were significantly higher in High-FE group(P<0.05).On the other hand,the acetyl-CoA content significantly increased in the liver of High-FE group(P¼0.002).The relative expression levels of insulin-like growth factor-1 and apolipoprotein A4 genes were significantly up-regulated in the liver of High-FE group(P<0.05),but relative expression level of monoacylglycerol O-acyltransferase 3 gene was significantly down-regulated(P¼0.037).These findings provide the mechanism by which the collaborative interaction between rumen microbiota fermentation and host uptake and metabolism of fermentation products impacts feed efficiency tr

关键词： Residual feed intake Sheep Microbial composition Rumen proteome Liver transcriptome Metabolite

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Transcriptome analysis of adipose tissue and muscle of Laiwu and Duroc pigs

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animal Nutrition 2024年第2期17卷 134-143页

作者： Jie Wu Fangyuan Yu Zhaoyang Di Liwen Bian Jie Yang Lina Wang Qingyan Jiang Yulong Yin Lin Zhang National Engineering Research Center for Breeding Swine Industry State Key Laboratory of Swine and Poultry Breeding IndustryGuangdong Laboratory of Lingnan Modern AgricultureGuangdong Provincial Key Laboratory of Animal Nutrition ControlCollege of Animal ScienceSouth China Agricultural University Key laboratory of Agro-Ecological Processes in Subtropical Region Laboratory of Animal Nutritional Physiology and Metabolic ProcessInstitute of Subtropical AgricultureChinese Academy of Sciences

Fat content is an important trait in pig production. Adipose tissue and muscle are important sites for fat deposition and affect production efficiency and quality. To regulate the fat content in these tissues, we need to understand the mechanisms behind fat deposition. Laiwu pigs, a Chinese indigenous breed, have significantly higher fat content in both adipose tissue and muscle than commercial breeds such as *** this study, we analyzed the transcriptomes in adipose tissue and muscle of 21-d-old Laiwu and Duroc piglets. Results showed that there were 828 and 671 differentially expressed genes(DEG) in subcutaneous adipose tissue(SAT) and visceral adipose tissue(VAT), respectively. Functional enrichment analysis showed that these DEG were enriched in metabolic pathways, especially carbohydrate and lipid metabolism. Additionally, in the longissimus muscle(LM) and psoas muscle(PM), 312 and 335 DEG were identified, demonstrating enrichment in the cell cycle and metabolic pathways. The protein-protein interaction(PPI) networks of these DEG were analyzed and potential hub genes were identified, such as FBP1 and SCD in adipose tissues and RRM2 and GADL1 in muscles. Meanwhile, results showed that there were common DEG between adipose tissue and muscle, such as LDHB, THRSP, and DGAT2. These findings showed that there are significant differences in the transcriptomes of the adipose tissue and muscle between Laiwu and Duroc piglets(P < 0.05), especially in metabolic patterns. This insight serves to advance our comprehensive understanding of metabolic regulation in these tissues and provide targets for fat content regulation.

关键词： Laiwu Duroc Adipose Muscle Transcriptome Carbohydrate and lipid metabolism

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Maternal supplementation with mulberry-leaf flavonoids improves the development of skeletal muscle in the offspring of chickens

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animal Nutrition 2024年第3期18卷 72-83页

作者： Zhenwu Huang Hongjian Dai Simeng Li Zhe Wang Quanwei Wei Zhonghua Ning Yuming Guo Fangxiong Shi Zengpeng Lv State Key laboratory of animal Nutrition and Feeding College of Animal Science and TechnologyChina Agricultural UniversityBeijing100193China College of animal Science and Technology Nanjing Agricultural UniversityNanjing210095China State Key laboratory of animal Nutrition and Feeding Institute of Animal SciencesChinese Academy of Agricultural SciencesBeijing100193China School of Biotechnology Aksu Vocational and Technical CollegeAksu843000China

The development of skeletal muscle is a crucial factor in determining the meat yield and economic benefits of broiler *** research has shown that mulberry leaves and their extracts can be used to significantly improve the growth performance of livestock and *** present study aims to elucidate the mechanisms involved in the regulation of skeletal muscle development in broiler offspring by dietary mulberry-leaf flavonoids(MLF)supplementation from the perspective of maternal effect theory.A total of 270 Qiling broiler breeder hens were randomly assigned to 3 treatments with different doses of MLF(0,30,60 mg/kg)for 8 weeks before collecting their fertilized *** chicken offspring at 13 and 19 d of embryonic stage,and from 1 to 28 d old after hatching were included in this *** results showed that maternal supplementation increased the breast muscle weight and body weight of the offspring at the embryo and chick stages(P<0.05).This was followed by increased cross-sectional area of pectoral muscle fibres at 14 d(P<0.05).Further determination revealed a tendency towards increased serum levels of insulin-like growth factor 1(IGF-1)(P=0.092)and muscle fibre count(P=0.167)at 1 d post-hatching following maternal MLF treatment,while serum uric acid(UA)was decreased at 14 d after hatching(P<0.05).Moreover,maternal MLF supplementation significantly up-regulated the mRNA expression of the myogenic regulatory factor Myf5 in skeletal muscle at the both embryonic and growth stages(P<0.05).The relative abundance of the downstream protein of BMPR2,Smad1 and p-Smad1/5/9 in the TGFβsignalling pathway was significantly increased by maternal MLF ***,the increased expression of the target protein p-mTOR in the breast muscle of the offspring chicks is in accordance with the improved growth rate of the breast and the *** conclusion,maternal MLF supplementation can promote muscle protein metabolism and muscle fibre development of chick embryos

关键词： Broiler breeder hen Mulberry-leaf flavonoids Offspring Protein metabolism Skeletal muscle

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Identification of porcine fast/slow myogenic exosomes and their regulatory effects on lipid accumulation in intramuscular adipocytes

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Journal of animal Science and Biotechnology 2024年第4期15卷 1512-1527页

作者： Tiantian Zhao Tingting Tian He Yu Chaoyue Cao Ziyi Zhang Zhaozhao He Zeqiang Ma Rui Cai Fengna Li Weijun Pang laboratory of animal Fat Deposition&Muscle Development College of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100ShaanxiChina laboratory of animal Nutritional Physiology and Metabolic Process Key Laboratory of Agro‑ecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125HunanChina

Background Pork quality is affected by the type of muscle fibers, which is closely related to meat color, tenderness and juiciness. Exosomes are tiny vesicles with a diameter of approximately 30–150 nm that are secreted by cells and taken up by recipient cells to mediate communication. Exosome-mediated muscle-fat tissue crosstalk is a newly discovered mechanism that may have an important effect on intramuscular fat deposition and with that on meat quality. Various of adipose tissue-derived exosomes have been discovered and identified, but the identification and function of muscle exosomes, especially porcine fast/slow myotube exosomes, remain unclear. Here, we first isolated and identified exosomes secreted from porcine extensor digitorum longus(EDL) and soleus(SOL), which represent fast and slow muscle, respectively, and further explored their effects on lipid accumulation in longissimus dorsi *** Porcine SOL-derived exosomes(SOL-EXO) and EDL-derived exosomes(EDL-EXO) were first identified and their average particle sizes were approximately 84 nm with double-membrane disc-shapes as observed via transmission electron microscopy and scanning electron microscopy. Moreover, the intramuscular fat content of the SOL was greater than that of the EDL at 180 days of age, because SOL intramuscular adipocytes had a stronger lipid-accumulating capacity than those of the EDL. Raman spectral analysis revealed that SOL-EXO protein content was much greater than that of EDL-EXO. Proteomic sequencing identified 72 proteins that were significantly differentially expressed between SOL-EXO and EDL-EXO, 31 of which were downregulated and 41 of which were upregulated in *** Our findings suggest that muscle-fat tissue interactions occur partly via SOL-EXO promoting adipogenic activity of intramuscular adipocytes.

关键词： Adipogenesis Exosome Extensor digitorum longus Intramuscular adipocyte Muscle-fat tissue interaction Pig Soleus

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Aflatoxin B1 decreased flesh flavor and inhibited muscle development in grass carp(Ctenopharyngodon idella)

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animal Nutrition 2024年第3期18卷 27-38页

作者： Xiang Ning He Zhen Zhen Zeng Wei Dan Jiang Pei Wu Yang Liu Sheng Yao Kuang Ling Tang Shu Wei Li Lin Feng Xiao Qiu Zhou animal Nutrition Institute Sichuan Agricultural UniversityChengdu 611130China Fish Nutrition and Safety Production University Key laboratory of Sichuan Province Sichuan Agricultural UniversityChengdu 611130China Key laboratory for animal Disease-Resistance Nutrition Ministry of EducationMinistry of Agriculture and Rural AffairsKey Laboratory of Sichuan ProvinceChengdu 611130China animal Nutrition Institute Sichuan Academy of Animal ScienceChengdu 610066China

In nature,aflatoxins,especially aflatoxin B1(AFB1),are the common mycotoxins,which cause serious health problems for humans and *** paper aimed to study the effects of AFB1 on flesh flavor and muscle development of grass carp(Ctenopharyngodon idella)and its *** were 1440 individual fish in total,with 6 treatments and each treatment replicated 3 *** 6 treatments were fed a control diet with different doses of AFB1(0.04,29.48,58.66,85.94,110.43 and 146.92μg/kg diet)for 60 ***1 increased myofiber diameter,as well as decreased myofiber density of grass carp muscle(P<0.05).The contents of free amino acid decreased gradually(P<0.05)as dietary AFB1 increased in the muscle of grass *** levels of reactive oxygen species,malonaldehyde and protein carbonyl(PC)were increased(P<0.05)with the dietary AFB1 *** levels of antioxidant enzyme(glutathione peroxidase,glutathione,glutathione reductase,total antioxidant capacity,anti-superoxide anion,and anti-hydroxyl radical)were decreased(P<0.05)with the dietary AFB1 *** addition,dietary AFB1 decreased the content of collagen,and downregulated the mRNA and protein levels of transforming growth factor-β(TGF-β)/Smads signaling pathway in grass carp muscle(P<0.05).The mRNA and protein levels of myogenic regulatory factors were downregulated in grass carp muscle(P<0.05).Furthermore,the activities of matrix metalloproteinase-2(MMP-2)and matrix metalloproteinase-9(MMP-9)were increased(P<0.05),and the protein levels of phosphorylate-38 mitogen-activated protein kinase(p-p38MAPK),phosphorylate-c-Jun N-terminal kinase,urokinase-type plasminogen activator(uPA),MMP-2 and MMP-9 were upregulated(P<0.05),but collagenⅠ,lamininβ1 and fibronectin were downregulated(P<0.05)with the dietary AFB1 increased in the muscle of grass *** on the results of this study,we can draw the following conclusion:dietary AFB1 might damage flesh flavor and inhibit the muscle development through MAPK/uPA/MMP/extrac

关键词： Aflatoxin B1 Flesh flavor Muscle development Grass carp

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