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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

Abstract : 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.
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https://hal.inrae.fr/hal-02862783
Déposant : Pascale Avril <>
Soumis le : mardi 9 juin 2020 - 16:35:00
Dernière modification le : lundi 29 juin 2020 - 15:16:56

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Helene Alami-Durante, Marianne Cluzeaud, Didier Bazin, Christiane Vachot, Sadasivam Kaushik. 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 Part A: Molecular & Integrative Physiology, 2020, 242, ⟨10.1016/j.cbpa.2020.110652⟩. ⟨hal-02862783⟩

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