Dietary isoleucine improved flesh quality,muscle antioxidant capacity,and muscle growth associated with AKT/TOR/S6K1 and AKT/FOXO3a signaling in hybrid bagrid catfish(Pelteobagrus vachelli♀×Leiocassis longirostris♂)  

作　　者：Qin Jiang Mingyao Yan Ye Zhao Xiaoqiu Zhou Long Yin Lin Feng Yang Liu Weidan Jiang Pei Wu Yan Wang Defang Chen Shiyong Yang Xiaoli Huang Jun Jiang 

机构地区：[1]College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China [2]Animal Nutrition Institute,Sichuan Agricultural University,Chengdu 611130,China [3]Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province,Sichuan Agricultural University,Ya’an 625014,China

出　　处：《Journal of Animal Science and Biotechnology》2021年第4期1384-1398,共15页畜牧与生物技术杂志（英文版）

基　　金：supported by National Key R&D Program of China(2019YFD0900200);the Applied Basic Research Programs of Science;Technology Commission Foundation of Sichuan Province,China(2015JY0067).

摘　　要：Background:Muscle is the complex and heterogeneous tissue,which comprises the primary edible part of the trunk of fish and mammals.Previous studies have shown that dietary isoleucine(Ile)exerts beneficial effects on growth in aquatic animals.However,there were limited studies regarding the benefits of Ile on fish muscle and their effects on flesh quality and muscle growth.Thus,this study was conducted to explore whether dietary Ile had affected flesh quality and muscle growth in hybrid bagrid catfish(Pelteobagrus vachelli♀×Leiocassis longirostris♂).Methods:A total of 630 hybrid fish,with an initial average body weight of 33.11±0.09 g,were randomly allotted into seven experimental groups with three replicates each,and respectively fed seven diets with 5.0,7.5,10.0,12.5,15.0,17.5,and 20.0 g Ile/kg diets for 8 weeks.Results:In the present study,we demonstrated that Ile significantly:(1)increased muscle protein and lipid contents and the frequency distribution of myofibers with≤20μm and≥50μm of diameter;(2)improved pH value,shear force,cathepsin B and L activities,hydroxyproline content,resilience,cohesiveness,and decreased cooking loss,lactate content,hardness,springiness,gumminess,and chewiness;(3)decreased reactive oxygen species(ROS),malondialdehyde(MDA),and protein carbonyl(PC)contents,GCLC and Keap1 mRNA levels,and up-regulated CuZnSOD,CAT,GPX1a,GST,and Nrf2 mRNA levels;(4)up-regulated the insulin-like growth factor 1,2(IGF-1,IGF-2),insulin-like growth factor 1 receptor(IGF-1R),proliferating cell nuclear antigen(PCNA),Myf5,Myod,Myog,Mrf4,and MyHC mRNA levels,and decreased MSTN mRNAlevel;(5)increased muscle protein deposition by activating AKT-TOR-S6K1 and AKT-FOXO3a signaling pathways.Conclusion:These results revealed that dietary Ile improved flesh quality,which might be due to increasing nutritional content,physicochemical,texture parameters,and antioxidant ability;promoting muscle growth by affecting myocytes hyperplasia and hypertrophy,and muscle protein deposition associated with protein synthe

关 键 词：Antioxidant capacity Flesh quality Hybrid bagrid catfish ISOLEUCINE MYOGENESIS Protein deposition 

分 类 号：S965.128[农业科学—水产养殖]