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J Physiol Volume 582, Number 2, 871-882, July 15, 2007 DOI: 10.1113/jphysiol.2007.130690
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INTEGRATIVE

Modification of fetal plasma amino acid composition by placental amino acid exchangers in vitro

 Jane K. Cleal1, Paul Brownbill2, Keith M. Godfrey1, John M. Jackson3, Alan A. Jackson3, Colin P. Sibley2, Mark A. Hanson1 and Rohan M. Lewis1

1 DOHaD Division, University of Southampton, UK
2 The Division of Human Development, The Medical School, University of Manchester, UK
3 The Institute of Human Nutrition, University of Southampton, UK

Fetal growth is dependent on both the quantity and relative composition of amino acids delivered to the fetal circulation, and impaired placental amino acid supply is associated with restricted fetal growth. Amino acid exchangers can alter the composition, but not the quantity, of amino acids in the intra- and extracellular amino acid pools. In the placenta, exchangers may be important determinants of the amino acid composition in the fetal circulation. This study investigates the substrate specificity of exchange between the placenta and the feto-placental circulation. Maternal–fetal transfer of radiolabelled amino acids and creatinine were measured in the isolated perfused human placental cotyledon. Transfer of L-[14C]serine or L-[14C]leucine, and [3H]glycine, were measured in the absence of amino acids in the fetal circulation (transfer by non-exchange mechanisms) and following 10–20 µmol boluses of unlabelled amino acids into the fetal circulation to provide substrates for exchange (transfer by exchange and non-exchange mechanisms). The ability of fetal arterial boluses of L-alanine and L-leucine to stimulate release of amino acids from the placenta was also determined using HPLC in order to demonstrate the overall pattern of amino acid release. Experiments with radiolabelled amino acids demonstrated increased maternal–fetal transfer of L-serine and L-leucine, but not glycine, following boluses of specific amino acids into the fetal circulation. L-[14C]Leucine, but not L-[14C]serine or [3H]glycine, was transferred from the maternal to the fetal circulation by non-exchange mechanisms also (P < 0.01). HPLC analysis demonstrated that fetal amino acid boluses stimulated increased transport of a range of different amino acids by 4–7 µmol l–1 (P < 0.05). Amino acid exchange provides a mechanism to supply the fetus with amino acids that it requires for fetal growth. This study demonstrates that these transporters have the capacity to exchange micromolar amounts of specific amino acids, and suggests that they play an important role in regulating fetal plasma amino acid composition.

(Received 19 February 2007; accepted after revision 30 April 2007; first published online 3 May 2007)
Corresponding author RM Lewis: DOHaD Division, University of Southampton, MP 887 Southampton General Hospital, Tremona Road, Southampton SO16 6YD, UK. Email: rml2{at}soton.ac.uk






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