title: Transport of L-proline by rat brain slices.
abstract: L-Proline is taken up into slices of rat cerebral cortex by a structurally specific 'high affinity' system which is absolutely dependent on sodium ions. The system mediating L-proline uptake in homogenates of cerebral cortex is associated with osmotically sensitive particles of the same equilibrium density as synaptosomes. Based on tissue-medium ratios, the uptake of L-proline is most efficient in slices of cerebral cortex and of hypothalamus, and least efficient in slices of cerebellum. L-Proline taken up into slices of cerebral cortex can be released from these slices by an increased potassium ioort into and out of brain slices are consistent with L-proline functioning as a synaptic transmitter in that they are analogous to observations on the transport of transmitter amino acids such as GABA.
mesh_terms: D000596:Amino Acids / Q000494:pharmacology; D000818:Animals; D001692:Biological Transport; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002531:Cerebellum / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism; D003342:Corpus Striatum / Q000378:metabolism; D007031:Hypothalamus / Q000378:metabolism; D066298:In Vitro Techniques; D008526:Medulla Oblongata / Q000378:metabolism; D008636:Mesencephalon / Q000378:metabolism; D011392:Proline / Q000378:metabolism*; D051381:Rats; D012964:Sodium / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D011392:Proline; D012964:Sodium