Effects of whey protein and casein plus leucine on diaphragm the mTOR pathway of sedentary, trained rats

The whey proteins are rich sources of leucine and affect mTOR-mediated skeletal muscle protein synthesis. The present authors wished to investigate the dose–response effect of chronic supplementation of the whey proteins (WP) with leucine on the anabolic pathway proteins mTOR and p70S6K in the diaph...

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Published in:	Food research international Vol. 49; no. 1; pp. 416 - 424
Main Authors:	Lollo, P.C.B., Silva, L.B.C., Batista, T.M., Morato, P.N., Moura, C.S., Cruz, A.G., Faria, J.A.F., Carneiro, E.M., Amaya-Farfan, J.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-11-2012 Elsevier
Subjects:	Amino acid supplementation Biological and medical sciences Casein Diaphragm Diaphragms Diets Feeding. Feeding behavior Food industries Fundamental and applied biological sciences. Psychology Leucine Milk and cheese industries. Ice creams Pathways Proteins Rats Vertebrates: anatomy and physiology, studies on body, several organs or systems Whey Whey protein AST ALS CK ALT CMV LDH BCAAs CAS Casein WP Diaphragm Whey protein Amino acid supplementation Rat Rodentia Leucine Feeding Milk protein Vertebrata Mammalia Aminoacid Supplementation
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Summary:	The whey proteins are rich sources of leucine and affect mTOR-mediated skeletal muscle protein synthesis. The present authors wished to investigate the dose–response effect of chronic supplementation of the whey proteins (WP) with leucine on the anabolic pathway proteins mTOR and p70S6K in the diaphragm of sedentary and exercised Wistar rats. Ninety-six weanling male Wistar rats were divided into eight groups and fed for 30day diets containing either casein or WP, with increasing levels (0, 3, 4.5 and 6% of the diet) of leucine. A parallel set of eight groups was exercised for comparison. Serum uric acid, creatinine, glucose, AST, ALT, CK, LDH and cholesterol, were determined by standard methods, and mTOR and p70S6K, using the Western blot analysis. Leucine supplementation increased both, mTOR and p70S6K in the diaphragm in a dose-dependent way, independent of the type of dietary protein. These changes produced no significant increase in either diaphragm or protein mass. ► Activation of the mTOR pathway in sedentary, trained rats was stimulated by leucine. ► Milk proteins plus leucine can stimulate the diaphragm mTOR response in rats. ► Whey proteins supplemented with 6% of leucine did not affect the diaphragm weight.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0963-9969 1873-7145
DOI:	10.1016/j.foodres.2012.07.024