Welcome to LookChem.com Sign In | Join Free

Science Details

Home > Chemical Encyclopedia > Science List > Details
  • Neutral amino acid transport into rat skeletal muscle: Competition, adaptive regulation, and effects of insulin

  • Add time:07/28/2019    Source:sciencedirect.com

    Amino acid (AA) transport systems A and L, which transfer preferentially small neutral AA (SNAA) and large neutral AA (LNAA), respectively, were studied in the isolated soleus muscle with the specific models, 2-(methylamino)isobutyrate (MeAIB) and 2-aminobicyclo[2,2,1]heptane-2-carboxylate (BCH). Affinity for MeAIB was greater than for BCH (Km = 3.2 ± 0.2 and 8.7 ± 0.2 mm, respectively). Rate of transport of MeAIB (Vmax = 104 ± 3 pmol/μL/min) was slower than for BCH (970 ± 12 pmol/μL/min), but accumulation was far more concentrative; transport of BCH, but not MeAIB, rapidly reached a steady-state level. MeAIB transport was reduced in the presence of SNAA; BCH transport was reduced to a lesser extent only by LNAA. Mixtures of AA at concentrations resembling those in plasmas of rats fed either a 6% or 50% casein diet reduced transport of MeAIB, whereas BCH transport was low only with the latter mixture. Only MeAIB transport was stimulated by insulin. Preincubation of muscles for 5 hours in a AA-free medium stimulated subsequent MeAIB uptake by about twofold to fourfold; this effect was suppressed by inhibitors of protein synthesis. Selective differences were thus observed in transport by skeletal muscle of model AA for the A and L systems: increased transport resulting from various stimuli was limited to the model for the A system, and transport of either model was depressed with mixtures containing physiological levels of AA. Changes in dietary protein or AA intake may thus alter transport of certain neutral AA into skeletal muscle via changes in plasma AA pools.

    We also recommend Trading Suppliers and Manufacturers of insulin, N-Me-Ile(2A)- (cas 112659-21-9). Pls Click Website Link as below: cas 112659-21-9 suppliers

    Prev:ERKs: A family of protein-serine/threonine kinases that are activated and tyrosine phosphorylated in response to insulin and NGF
    Next:Expression of insulin-like growth factor II (IGF-II) in human primary liver cancer: mRNA and protein analysis)

  • Back】【Close 】【Print】【Add to favorite
Periodic Table
    Related Products