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Variable impacts of L-arginine or L-NAME during early life on molecular and cellular markers of muscle growth mechanisms in rainbow trout.
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.1 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.cbpa.2020.110652
Hélène Alami-Durante 1 , Marianne Cluzeaud 1 , Didier Bazin 1 , Christiane Vachot 1 , Sadasivam Kaushik 1
Affiliation  

Two experiments were conducted to test if manipulations of the Arginine-Nitric oxide pathway during the early life of rainbow trout would act on its early myogenic process. In experiment 1, trout embryos were immersed at 72° days post-fertilization (°dpf) or 104°dpf in water alone (control treatment, C) or containing 2 mM/L L-Arg (treatment A) or 1 mM/L of L-NAME, a NOS inhibitor (treatment N). We observed the beginning of expression of myf5 and fmhc genes at 72°dpf and 96°dpf, respectively. "A" treatment doubled the free Arg content of eggs but did not affect either the pattern of expression of myf5 and fmhc, nor white muscle cross-sectional area and number of white muscle fibres at hatching, nor embryo survival and fry growth. "N" treatment also did not affect these markers. In experiment 2, trout fry were fed from first feeding onwards and during 20 days either a control diet (C) or the same diet supplemented with L-NAME (0.1 g/100 g diet, N-diet). In C-fed fry, distribution of a single meal after overnight fasting induced changes in pcna, myod1, myog, fmhc, inos, nnos and ctsd gene expressions. N-feeding decreased fry growth but did not change their growth trajectory or survival. Twenty days of N-feeding led, compared to C-feeding, to changes in kinetics of transcription of pcna, myod1, myog, fmhc, inos, nnos, ctsd genes and to decreased white muscle cross-sectional area, total number of white muscle fibres, and number of large muscle fibres. L-NAME feeding thus decreased fry muscle growth by altering both hyperplasia and hypertrophy.

中文翻译:

生命早期L-精氨酸或L-NAME对虹鳟肌肉生长机制的分子和细胞标志物的影响不同。

进行了两个实验,以测试虹鳟生命早期对精氨酸一氧化氮途径的操纵是否会影响其早期成肌过程。在实验1中,将鳟鱼胚在受精后(°dpf)或104°dpf浸入水中(对照处理,C)或含有2 mM / L L-Arg(处理A)或1 mM / L的水中浸泡(°dpf)或104°dpf NOS抑制剂L-NAME(治疗N)。我们观察到myf5和fmhc基因分别在72°dpf和96°dpf处开始表达。“ A”处理使卵中的游离Arg含量增加了一倍,但既不影响myf5和fmhc的表达模式,也不影响孵化时白肌的横截面积和白肌纤维的数量,也不影响胚胎存活和鱼苗的生长。“ N”处理也不影响这些标记。在实验2中,鳟鱼鱼苗从第一次喂养开始就进行喂养,在20天之内以对照饮食(C)或补充L-NAME的相同饮食(0.1 g / 100 g饮食,N-饮食)进行喂养。在以C喂食的鱼苗中,禁食过夜后分发一顿饭会引起pcna,myod1,myog,fmhc,inos,nnos和ctsd基因表达的变化。氮喂养减少了鱼苗的生长,但没有改变鱼苗的生长轨迹或存活率。与C饲喂相比,N饲喂20天导致pcna,myod1,myog,fmhc,inos,nnos,ctsd基因的转录动力学改变,并且白肌截面积减少,白肌总数纤维和大量的大肌纤维。因此,L-NAME喂养通过改变增生和肥大来减少鱼苗肌肉的生长。
更新日期:2020-01-08
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