Abstract:
:The neurotrophin (NT) brain-derived neurotrophic factor (BDNF) plays an essential role in the formation of long-term potentiation (LTP). Here, we address whether this modulation by BDNF requires its continuous presence, or whether a local increase in BDNF is necessary during a specific time period of LTP initiation. Using electrical field stimulation of primary cultures of hippocampal neurons, we demonstrate that short high-frequency bursts of stimuli that induce LTP evoke also an instantaneous secretion of BDNF. In contrast, stimuli at low frequencies, inducing long-term depression, do not enhance BDNF secretion, suggesting that BDNF is specifically present, and thus required, at the time of LTP induction. The field-stimulation-mediated BDNF secretion depends on the formation of action potentials and is induced by IP(3)-mediated Ca(2+) release from intracellular stores. Experiments, aimed at determining the sites of NT secretion that use NT6, showed similar patterns of surface labeling by field stimulation to those shown previously by high potassium.
journal_name
Proc Natl Acad Sci U S Aauthors
Gärtner A,Staiger Vdoi
10.1073/pnas.092129699keywords:
subject
Has Abstractpub_date
2002-04-30 00:00:00pages
6386-91issue
9eissn
0027-8424issn
1091-6490pii
99/9/6386journal_volume
99pub_type
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