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The effects of reduced dietary protein level on amino acid transporters and mTOR signaling pathway in pigs.

Abstract：

:Amino acid transporter plays an important role in regulating mTOR signaling pathway. This study investigated the effects of reduced dietary protein levels on amino acid transporters and mTOR signaling pathway. A total of 54 weaning pigs were randomly allocated into a 3 × 3 factorial design, followed by slaughtering the pigs separately after 10-, 25- and 45-day feeding, with 18 pigs from each feeding period divided into three subgroups for treatment with three different protein-level diets: 20% crude protein (CP) diet (normal recommended, high protein, HP), 17% CP diet (medium protein, MP) and 14% CP diet (low protein, LP). The results indicated that reduced dietary protein level decreased the weight of longissimus dorsi. Additionally, quantitative PCR chip analysis showed that mRNA expression of amino acid transporters SLC38A2, SLC1A7, SLC7A1, SLC7A5, SLC16A10 and SLC3A2 in the LP group were significantly (P < 0.05) higher than those in the MP or HP group, and the phosphorylation of mTOR and S6K1 decreased in the LP group after 25-day feeding. Furthermore, the vitro experimental results further confirmed that the mRNA levels for SLC7A1, SLC7A5, SLC3A2, SLC38A2 and SLC36A1 were increased and the phosphorylation of mTOR and S6K1 was decreased when the concentration of amino acids in C2C12 myoblasts was reduced. All these results indicated that the LP diet induced a high expression of amino acid transporters and the inhibition of the mTOR activity, which resulting in restriction on protein synthesis and longissimus dorsi growth.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Wang D,Wan X,Peng J,Xiong Q,Niu H,Li H,Chai J,Jiang S

doi

10.1016/j.bbrc.2017.02.084

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

319-327

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)30375-3

journal_volume

485

pub_type

杂志文章

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