Abstract
Piperidine is actively transported into the synaptosomal fraction of adult mouse brain. The transport mechanism appears to be Na+ independent but is temperature dependent and sensitive to ouabain. Analysis of kinetic experiments indicates only a “low-affinity” transport system to be present. By contrast the uptake ofD,L-[3H]pipecolic acid at a concentration of 4×10−7 M was temperature and Na+ dependent, ouabain sensitive, and revealed a two-component system with aK m =3.9±0.17×10−6 M,V max=129±6 pmol/mg protein/3 min for the “high-affinity” system and aK m =90.2±4.3×10−6 M,V max=2.45±0.19 nmol/mg protein/3 min for the “low-affinity” system. Compounds structurally related to pipecolic acid such as glycine,l-proline, 4-amino-n-butyric acid, and 5-amino-n-valeric acid showed an inhibitory effect on uptake at a concentration of 10−4 M. The demonstration of biosynthesis of pipecolic acid in mouse brain and the presence of a “high-affinity” sodium-dependent uptake system suggest a physiological role of this substance in the central nervous system.
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Nomura, Y., Schmidt-Glenewinkel, T. & Giacobini, E. Uptake of piperidine and pipecolic acid by synaptosomes from mouse brain. Neurochem Res 5, 1163–1173 (1980). https://doi.org/10.1007/BF00964896
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DOI: https://doi.org/10.1007/BF00964896