NDLI: L-leucine and L-alanine uptake by trout (Salmo trutta) cardiomyocytes: the effect of IGF-I and insulin

Content Provider	Springer Nature Link
Author	Gallardo, M.A. Castejón, C. Navarro, I. Blasco, J. Gutiérrez, J. Sánchez, J.
Copyright Year	2001
Abstract	The uptake of L-leucine and L-alanine by trout cardiomyocytes was analysed to identify the carriers involved in their incorporation into cells. The sodium independent systems L and asc, as well as the sodium dependent system ASC, were found to be present. The Vmax of these carriers was 33.0, 40.1 and 19.4 pmol amino acid mg−1 prot min−1 for L, asc and ASC, respectively, and the Km values obtained for these transport systems were 296, 269 and 349 μM amino acid. The L system had as its main substrates the large apolar branched-chain amino acids and showed stereospecificity. The asc and ASC systems carried the short-chain neutral amino acids and were not inhibited by Me-AIB. The ASC transporter also showed adaptive regulation. The effect of IGF-I and insulin on L-alanine uptake, as well as the incorporation of L-leucine into protein, were also studied. Low IGF-I concentrations (below 2.5 ng ml−1) stimulated the uptake of L-alanine and protein synthesis but this effect reverted at high IGF-I concentrations. Insulin depressed protein synthesis and did not affect L-alanine uptake.
Starting Page	239
Ending Page	248
Page Count	10
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	25
Issue Number	3
e-ISSN	15735168
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Animal Biochemistry Hydrobiology Zoology Animal Anatomy / Morphology / Histology Animal Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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