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Regulation of synaptic responses to high-frequency stimulation and LTP by neurotrophins in the hippocampus

NEUROTROPHINS promote neuronal survival and differentiation, but the fact that their expression is modified by neuronal activity, suggests a role in regulating synapse development and plasticity 1–3 . In developing hippocampus, the expression of brain-derived neurotrophic factor (BDNF) and its recep...

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Published in:Nature (London) 1996-06, Vol.381 (6584), p.706-709
Main Authors: Figurov, Alexander, Pozzo-Miller, Lucas D., Olafsson, Petur, Wang, Ti, Lu, Bai
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Language:English
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description NEUROTROPHINS promote neuronal survival and differentiation, but the fact that their expression is modified by neuronal activity, suggests a role in regulating synapse development and plasticity 1–3 . In developing hippocampus, the expression of brain-derived neurotrophic factor (BDNF) and its receptor TrkB 4–7 increases in parallel with the ability to undergo long-term potentiation (LTP) 8–10 . Here we report a mechanism by which BDNF modulates hippocampal LTP. Exogenous BDNF promoted the induction of LTP by tetanic stimulation in young (postnatal day 12–13) hippocampal slices, which in the absence of BDNF show only short-term potentiation (STP). This effect was due to an enhanced ability of hippocampal synapses to respond to tetanic stimulation, rather than to a direct modulation of the LTP-triggering mechanism. A TrkB–IgG fusion protein, which scavenges endogenous BDNF 11 , reduced the synaptic responses to tetanus as well as the magnitude of LTP in adult hippocampus. Our results suggest that BDNF may regulate LTP in developing and adult hippocampus by enhancing synaptic responses to tetanic stimulation.
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subjects Animals
Biological and medical sciences
Brain
Brain-Derived Neurotrophic Factor
Central nervous system
Central neurotransmission. Neuromudulation. Pathways and receptors
Evoked Potentials
Fundamental and applied biological sciences. Psychology
Hippocampus - physiology
Humanities and Social Sciences
Humans
Immunoglobulin G - immunology
In Vitro Techniques
letter
Long-Term Potentiation - physiology
Male
Molecular biology
multidisciplinary
Nerve Growth Factors - antagonists & inhibitors
Nerve Growth Factors - physiology
Nerve Tissue Proteins - antagonists & inhibitors
Nerve Tissue Proteins - physiology
Neurons
Plasticity
Rats
Rats, Sprague-Dawley
Receptor, Ciliary Neurotrophic Factor
Receptors, Nerve Growth Factor - physiology
Recombinant Proteins - pharmacology
Science
Science (multidisciplinary)
Synapses - physiology
Vertebrates: nervous system and sense organs
title Regulation of synaptic responses to high-frequency stimulation and LTP by neurotrophins in the hippocampus
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