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A Na+-DEPENDENT SYSTEM A AND ASC-INDEPENDENT AMINO ACID TRANSPORT SYSTEM STIMULATED BY GLUCAGON IN RAT HEPATOCYTES

✍ Scribed by Soo Kyung Lim; Luc Cynober; Jean-Pascal De Bandt; Christian Aussel

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
202 KB
Volume
23
Category
Article
ISSN
1065-6995

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✦ Synopsis

The effects of glucagon on amino acid transport in rat hepatocytes are not fully understood. We examined the effect of this hormone on alanine, serine and cysteine preferring system (system ASC)‐mediated amino acid transport in rat hepatocyte monolayers using 2‐aminoisobutyric acid (AIB) and L ‐cysteine. Glucagon induced a time and protein synthesis‐dependent stimulation of Na^+^‐dependent alanine preferring system (system A)‐independent AIB transport. The glucagon‐induced increase in transport activity was not modified by substrate starvation and not related to changes in the intracellular pool of amino acids. Glucagon did not modify system ASC activity measured by L ‐cysteine. Therefore the transport activity of AIB independent of system A stimulated by glucagon cannot be attributed to system ASC. This suggests a Na^+^‐dependent transport system in rat hepatocytes not identified until now.

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✍ Thomas L. Freeman; Hao Q. Ngo; Mark E. Mailliard 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 119 KB 👁 1 views

System A, the sodium-dependent neutral amino acid transport activity, has a 3-fold increase in its initial uptake velocity into hepatocytes following partial hepatectomy (PH) in the rat. The purpose of this study was to examine the effect of inhibition of System A-mediated amino acid transport on he