László Héja

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Glutamate and γ-aminobutyric acid (GABA) transporters play important roles in balancing excitatory and inhibitory signals in the brain. Increasing evidence suggest that they may act concertedly to regulate extracellular levels of the neurotransmitters. Here we present evidence that glutamate uptake-induced release of GABA from astrocytes has a direct impact(More)
Neurotransmitter plasma membrane transporters do have much more to perform than simply terminating synaptic transmission and replenishing neurotransmitter pools. Findings in the past decade have evidenced their function in maintaining physiological synaptic excitability, and their actions in critical or pathological conditions, also. Conclusively these(More)
BACKGROUND Glutamate (Glu) and gamma-aminobutyric acid (GABA) transporters play important roles in regulating neuronal activity. Glu is removed from the extracellular space dominantly by glial transporters. In contrast, GABA is mainly taken up by neurons. However, the glial GABA transporter subtypes share their localization with the Glu transporters and(More)
Here we address how dynamics of glutamatergic and GABAergic synaptic input to CA3 pyramidal cells contribute to spontaneous emergence and evolution of recurrent seizure-like events (SLEs) in juvenile (P10-13) rat hippocampal slices bathed in low-[Mg(2+)] artificial cerebrospinal fluid. In field potential recordings from the CA3 pyramidal layer, a short(More)
Hippocampal sharp wave-ripples (SPW-Rs) occur during slow wave sleep and behavioral immobility and are thought to play an important role in memory formation. We investigated the cellular and network properties of SPW-Rs with simultaneous laminar multielectrode and intracellular recordings in a rat hippocampal slice model, using physiological bathing medium.(More)
  • L Héja
  • Current medicinal chemistry
  • 2014
Although glial proliferation of the epileptic loci is recognized for more than a century in certain focal epilepsies, the role of astrocytes in epileptic conditions is receiving significant attention only in recent years. The present review will highlight current knowledge about the various ways astrocytes control neuronal excitability and contribute to(More)
The transmembrane Na(+) concentration gradient is an important source of energy required not only to enable the generation of action potentials in excitable cells, but also for various transmembrane transporters both in excitable and non-excitable cells, like astrocytes. One of the vital functions of astrocytes in the central nervous system (CNS) is to(More)
The inhibitory gamma-aminobutyric acid transporter subtype 1 (GAT1) maintains low resting synaptic GABA level, and is a potential target for antiepileptic drugs. Here we report a high scored binding mode that associates GABA with gating in a homology model of the human GAT1. Docking and molecular dynamics calculations recognize the amino function of GABA in(More)
Crystal structures of transmembrane transport proteins belonging to the important families of neurotransmitter-sodium symporters reveal how they transport neurotransmitters across membranes. Substrate-induced structural conformations of gated neurotransmitter-sodium symporters have been in the focus of research, however, a key question concerning the(More)
25 Here we address how dynamics of glutamatergic and GABAergic synaptic input to CA3 26 pyramidal cells contribute to spontaneous emergence and evolution of recurrent seizure-like 27 events (SLEs) in juvenile (P10-13) rat hippocampal slices bathed in low-[Mg] artificial 28 cerebrospinal fluid. In field potential recordings from CA3 pyramidal layer a short(More)