Summary
Amino acid transport at the luminal side of brain capillary endothelium and the basal side of salivary epithelium were compared using a nondestructive, first-circulation, paired-tracer dilution method. In the brain, the reference molecule was an intravascular marker (Crone’s method) whereas in the salivary gland the reference was an extracellular marker of similar size to the test molecule. The unidirectional flux was related to a maximal uptake, U:
Uptake and cross-inhibition experiments in brain suggest the presence of only a long-chain neutral L-amino acid transport system (leucine, phenylalanine, tryptophan, tyrosine, valine, methionine). In contrast, results in the salivary gland suggest 4 transport systems: 1. large neutral, 2. small neutral (alanine, serine), 3. basic (lysine) and 4. acidic (aspartic, glutamic). The same method was applied to localize binding sites. Ouabain bound very significantly to the salivary epithelium but not at all to the brain endothelium. The method described is of interest since it can be extended to any organ and possibly to man.
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Yudilevich, D.L., Sepúlveda, F.V., Bustamante, J.C., Mann, G.E. (1979). A Comparison of Amino Acid Transport and Ouabain Binding in Brain Endothelium and Salivary Epithelium Studied in vivo by Rapid Paired-Tracer Dilution. In: Baumann, P. (eds) Transport Mechanisms of Tryptophan in Blood Cells, Nerve Cells, and at the Blood-Brain Barrier. Journal of Neural Transmission, vol 15. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2243-3_2
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DOI: https://doi.org/10.1007/978-3-7091-2243-3_2
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