Abstract
The active uptake of [3H]pipecolic acid increased with incubation time and its uptake at 3 min was half of that at 20 min. [14C]GABA uptake rose earlier, and its uptake at 3 min was almost 80% of that at 20 min. On the other hand, a ratio (pellet/medium) of [3H]pipecolic acid uptake into glial cell-enriched fractions, was much less (0.4–0.6) than that of [14C]GABA (25.8–74.1). GABA, 10−4 M, and pipecolic acid, 10−4 M, produced a significant inhibition of [3H]pipecolic acid uptake into P2 fractions. Pipecolic acid, 10−4 M, significantly reduced the synaptosomal and glial uptake of [14C]GABA. GABA, 10−4 M, affected neither spontaneous nor high K+-induced release of [3H]pipecolic acid from brain slices. It is suggested that pipecolic acid is involved in either synaptic transmission or in its modulation at GABA synapses in the central nervous system.
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Nomura, Y., Okuma, Y., Segawa, T. et al. Comparison of synaptosomal and glial uptake of pipecolic acid and GABA in rat brain. Neurochem Res 6, 391–400 (1981). https://doi.org/10.1007/BF00963854
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DOI: https://doi.org/10.1007/BF00963854