GABA neurotransmission is terminated by high affinity transport mediated by a number of carriers on neurons and astrocytes. So far four different carriers have been cloned and their cellular distribution has been partly worked out. It is generally believed that GAT-1 (mouse homologue GAT1) is the quantitatively most important of the transporters and it is primarily present on GABAergic neurons but also to some extent on astrocytes. The pharmacological properties of neuronal and astrocytic GABA uptake have been studied extensively and recently the GABA analogue N-methyl-Exo-THPO has been reported to act as a selective and potent (IC50 28 microM) astroglial GABA transport inhibitor with a 15-fold selectivity. It has moreover been reported to act as an anticonvulsant in animal models of epilepsy. This may underline the functional importance of astrocytic GABA uptake in relation to seizure activity.
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