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kalbant apie BCAA
Leucine Regulates Translation Initiation of Protein Synthesis in Skeletal Muscle after Exercise
Layne E. Norton and Donald K. Layman

High-performance physical activity and postexercise recovery lead to significant changes in amino acid and protein metabolism in skeletal muscle. Central to these changes is an increase in the metabolism of the BCAA leucine.

During exercise, muscle protein synthesis decreases together with a net increase in protein degradation and stimulation of BCAA oxidation. The decrease in protein synthesis is associated with inhibition of translation initiation factors 4E and 4G and ribosomal protein S6 under regulatory controls of intracellular insulin signaling and leucine concentrations.

BCAA oxidation increases through activation of the branched-chain {alpha}-keto acid dehydrogenase (BCKDH). BCKDH activity increases with exercise, reducing plasma and intracellular leucine concentrations. After exercise, recovery of muscle protein synthesis requires dietary protein or BCAA to increase tissue levels of leucine in order to release the inhibition of the initiation factor 4 complex through activation of the protein kinase mammalian target of rapamycin (mTOR).

Leucine's effect on mTOR is synergistic with insulin via the phosphoinositol 3-kinase signaling pathway. Together, insulin and leucine allow skeletal muscle to coordinate protein synthesis with physiological state and dietary intake.

Orally Administered Leucine Enhances Protein Synthesis in Skeletal Muscle of Diabetic Rats in the Absence of Increases in 4E-BP1 or S6K1 Phosphorylation

Joshua C. Anthony, Ali K. Reiter, Tracy G. Anthony, Stephen J. Crozier, Charles H. Lang, David A. MacLean, Scot R. Kimball, and Leonard S. Jefferson


In this study, food-deprived (18 h) control rats and rats with alloxan-induced diabetes were orally administered saline or the amino acid leucine to assess whether it regulates protein synthesis independently of a change in serum insulin concentrations. Immediately after leucine administration, diabetic rats were infused with insulin (0.0, 4.0, or 20 pmol · min-1 · kg-1) for 1 h to examine the role of the hormone in the protein synthetic response to leucine.

In control rats, leucine stimulated protein synthesis by 58% and increased phosphorylation of the translational repressor, eukaryotic initiation factor (eIF) 4E-binding protein (BP)-1, 4E-BP1, fivefold. Consequently, association of the mRNA cap-binding protein eukaryotic initiation factor (eIF)4E with 4E-BP1 was reduced to 50% of control values, and eIF4G•eIF4E complex assembly was increased 80%.

Furthermore, leucine increased the phosphorylation of the 70-kDa ribosomal protein S6 (rp S6) and the ribosomal protein S6 kinase (S6K1). Diabetes attenuated protein synthesis compared with control rats.

Nonetheless, in diabetic rats, leucine increased protein synthesis by 53% without concomitant changes in the phosphorylation of 4E-BP1 or S6K1. Skeletal muscle protein synthesis was stimulated in diabetic rats infused with insulin, but rates of synthesis remained less than values in nondiabetic controls that were administered leucine.

Phosphorylation of 4E-BP1 and S6K1 was increased in diabetic rats infused with insulin in a dose-dependent manner, and the response was enhanced by leucine. The results suggest that leucine enhances protein synthesis in skeletal muscle through both insulin-dependent and -independent mechanisms.

The insulin-dependent mechanism is associated with increased phosphorylation of 4E-BP1 and S6K1. In contrast, the insulin-independent effect on protein synthesis is mediated by an unknown mechanism.

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Sveiki, nutariau nupirkti amino rugsciu, bet nezinau ka cia paemus, cia is dyleriu radau toki Trec Nutrition BCAA G-Force , gal kas vartojot? verta imti, ar gal kita koki pasiulytumet?

gedemas rašė:

jei nebijei slykstaus skonio pasiimk grynu bcaa, pinigu sutaupysi ir nauda geresne bus

na esu moksleivis tai zinoma noreciau, kuo daugiau sutaupyt, o tai cia grynas bcaa kokiu cia pavadinimu jis bus?

gedemas rašė:

tokiu ir yra pavadinimu BCAA paziurek pas dylerius visi turi baltos spalvos milteliai...

ajsq, sakai, kad cia bus milteliai, o su kuo juos geriausiai maisyt? ir kokiu kiekiu?

.

tiksliau sauktelis arbatinis bet ne pats maziausias

Pridurciau, kad tas arbatinis su geru kaupu turetu buti, nes jos tikrai lengvos.

na pokolkas jau menuo kaip geriu ir visiskai tuom nesiskundziu.

Valdas rašė:

Paskui idomu kiek dienu iskentes grynas gerti....

Aga , idomu .. Pats neskaniausias dalykas, kaip kokia pelynu arbata gertum

Redas rašė:

kaip geriau aminkes vartot? maisant su vandeniu ar iskart i burna?

dėk į burną ir užgerk vandeniu

tik pasakau kad vandenyje jos nenori tirpt ir burnoj ilgai siulyciau nelaikyt ysidejei sauktely uzpylei vndeniu ir ryk , dar karta vandens ir dar ir dar

Jigis rašė:

http://www.olimp-papildai.lt/index2.php?page=l_pro2&id_pr=109&ids=50&str=2&sh=1
nuomonės?

gaunasi 356g uz 92lt kazkur