Dietary supplementation with arginine and glutamic acid alters the expression of amino acid transporters in skeletal muscle of growing pigs.
Amino Acids
; 51(7): 1081-1092, 2019 Jul.
Article
in En
| MEDLINE
| ID: mdl-31175485
ABSTRACT
Sixty Duroc × Large White × Landrace pigs with an average initial body weight (BW) of 77.1 ± 1.3 kg were selected to investigate the effects of dietary supplementation with arginine (Arg) and/or glutamic acid (Glu) on free amino acid (FAA) profiles, expression of AA transporters, and growth-related genes in skeletal muscle. The animals were randomly assigned to one of five treatment groups (basic diet, iso-nitrogenous, Arg, Glu, and Arg + Glu groups). The results showed that plasma Glu concentration was lowest in the Arg + Glu group and highest in the Glu group (P < 0.05). In the longissimus dorsi (LD) muscle, the concentrations of histidine, Arg, and taurine in the Arg + Glu group were higher, and the concentrations of 3-methylhistidine was lower, than in the basic diet group (P < 0.05). The mRNA levels of ASC amino acid transporter-2 (ASCT2), L-type AA transporter 1, and sodium-coupled neutral amino acid transporter 2 in the LD muscle, as well as the mRNA levels of ASCT2 and proton-assisted amino acid transporter in the biceps femoris (BF) muscle, were higher in the Arg + Glu group compared to the basic diet group (P < 0.05). The mRNA levels of the muscle-specific RING finger-1 and muscle atrophy F-box genes in the LD muscle were downregulated in the Glu and Arg + Glu groups compared to the basic diet group (P < 0.05). Collectively, these findings suggest that dietary supplementation with both Arg and Glu increases intramuscular FAA concentrations and decreases the mRNA levels of genes involved in protein degradation in skeletal muscle.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Arginine
/
Swine
/
Muscle, Skeletal
/
Glutamic Acid
/
Amino Acid Transport Systems
Limits:
Animals
Language:
En
Journal:
Amino Acids
Journal subject:
BIOQUIMICA
Year:
2019
Document type:
Article