Different Mechanisms Exist for the Plasticity of Glutamate Reuptake During Early Long-term Potentiation (Ltp) and Late Ltp.
From: Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204-5001, USA.
The Journal of neuroscience : the official journal of the Society for Neuroscience
- Publish Date: Oct 2006
- ISSN: 1529-2401
- Volume: 26
- Issue: 41
- Pages: 10461-71
- Medium: Internet
- Language: English
- Citation (JAMA): Pita-Almenar Juan D, Collado Maria Sol, Colbert Costa M, et al. Different Mechanisms Exist for the Plasticity of Glutamate Reuptake During Early Long-term Potentiation (Ltp) and Late Ltp.. J. Neurosci. Oct 2006;26:10461-71
Abstract
Regulation of glutamate reuptake occurs along with several forms of synaptic plasticity. These associations led to the hypothesis that regulation of glutamate uptake is a general component of plasticity at glutamatergic synapses. We tested this hypothesis by determining whether glutamate uptake is regulated during both the early phases (E-LTP) and late phases (L-LTP) of long-term potentiation (LTP). We found that glutamate uptake was rapidly increased within minutes after induction of LTP and that the increase in glutamate uptake persisted for at least 3 h in CA1 of the hippocampus. NMDA receptor activation and Na+-dependent high-affinity glutamate transporters were responsible for the regulation of glutamate uptake during all phases of LTP. However, different mechanisms appear to be responsible for the increase in glutamate uptake during E-LTP and L-LTP. The increase in glutamate uptake observed during E-LTP did not require new protein synthesis, was mediated by PKC but not cAMP, and as previously shown was attributable to EAAC1 (excitatory amino acid carrier-1), a neuronal glutamate transporter. On the other hand, the increase in glutamate uptake during L-LTP required new protein synthesis and was mediated by the cAMP-PKA (protein kinase A) pathway, and it involved a different glutamate transporter, GLT1a (glutamate transporter subtype 1a). The switch in mechanisms regulating glutamate uptake between E-LTP and L-LTP paralleled the differences in the mechanisms responsible for the induction of E-LTP and L-LTP. Moreover, the differences in signaling pathways and transporters involved in regulating glutamate uptake during E-LTP and L-LTP indicate that different functions and/or sites may exist for the changes in glutamate uptake during E-LTP and L-LTP.
Mesh Headings (Keywords): Animals, Glutamic Acid, Hippocampus, Long-Term Potentiation, Male, Neuronal Plasticity, Rats, Rats, Sprague-Dawley, Time Factors
Check for Full Text / PubMed Unique Identifier (PMID): 17035530
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