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Functional characterization of tyrosine transport in fibroblast cells from healthy controls
Department of Clinical Medicine, Biomedicine, Örebro University, SE-701 82 Örebro, Sweden.
Department of Neuroscience, Psychiatry, Ulleråker, SE-750 17 Uppsala, Sweden.
Department of Psychiatry, R and D Section, Danderyd's Hospital, SE-182 87 Danderyd, Sweden.
Linköping University, Faculty of Health Sciences. Linköping University, Department of Clinical and Experimental Medicine, Psychiatry .
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2008 (English)In: Neuroscience Letters, ISSN 0304-3940, Vol. 434, no 1, 56-60 p.Article in journal (Refereed) Published
Abstract [en]

Human fibroblast cells are an advantageous model to study the transport of amino acids across cell membranes, since one can control the environmental factors. A major problem in all earlier studies is the lack of precise and detailed knowledge regarding the expression and functionality of tyrosine transporters in human fibroblasts. This motivated us to perform a systematic functional characterization of the tyrosine transport in fibroblast cells with respect to the isoforms of system-L (LAT1, LAT2, LAT3, LAT4), which is the major transporter of tyrosine. Ten (n = 10) fibroblast cell lines from healthy volunteers were included in the study. Uptake of L-[U-14C] tyrosine in fibroblasts was measured using the cluster tray method in the presence and absence of excess concentrations of various combinations of inhibitors. This study demonstrated that LAT1 is involved in 90% of total uptake of tyrosine and also around 51% of alanine. Not more than 10% can be accounted for by LAT2, LAT3 and LAT4 isoforms. LAT2 seems to be functionally weak in uptake of tyrosine while LAT3 and LAT4 contributed around 7%. 10% could be contributed by system-A (ATA2 isoform). Alanine consequently inhibited the tyrosine transport by up to 60%. Tyrosine transport through the LAT1 isoform has a higher affinity compared to system-L. In conclusion, the LAT1 isoform is the major transporter of tyrosine in human fibroblast cells. Competition between tyrosine and alanine for transport is shown to exist, probably between LAT1 and LAT2 isoforms. This study established fibroblast cells as a suitable experimental model for studying amino acid transport defects in humans. © 2008 Elsevier Ireland Ltd. All rights reserved.

Place, publisher, year, edition, pages
2008. Vol. 434, no 1, 56-60 p.
Keyword [en]
Human fibroblasts, Tyrosine and alanine transport, LAT1, LAT2, LAT3, LAT4
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-46622DOI: 10.1016/j.neulet.2008.01.028OAI: diva2:267518
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-10

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