Journal
BRAIN RESEARCH
Volume 1391, Issue -, Pages 14-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2011.03.061
Keywords
Nitric oxide; TrkB; Neurotrophins; Synaptic plasticity; Retrograde messenger
Categories
Funding
- DFG [SFB 553, SFB 779]
- Stiftung Rheinland-Pfalz [706]
- Schram Stiftung
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BDNF and nitric oxide signaling both contribute to long-term potentiation (LTP) at glutamatergic synapses, but to date, few studies analyzed the interaction of both signaling cascades in the same synaptic pathway. Here we addressed the question whether the residual LTP in the CA1 region of hippocampal slices from heterozygous BDNF knockout mice (BDNF(+/-)) is dependent on nitric oxide (NO) signaling. Extracellular recording of synaptic field potentials elicited by presynaptic Schaffer collateral stimulation was performed in the CA1 region of hippocampal slices of 4- to 6-week-old mice, and LTP was induced by a theta burst stimulation protocol. Application of the nitric oxide inhibitor L-NAME (200 mu M) strongly inhibited LTP by 70% in wildtype animals. This inhibition of LTP was not a consequence of altered basal synaptic properties. In CA1 of BDNF(+/-) mice, stimulated with the same theta burst protocol, LTP was reduced by 50% as compared to wildtype animals. This impairment in the expression of LTP in BDNF(+/-) mice did not result from an increased synaptic fatigue. The residual LTP in BDNF(+/-) was not further reduced by preincubation of slices with L-NAME. These results suggest that BDNF and NO share overlapping intracellular signaling cascades to mediate LTP in CA1, and part of their signaling cascades are most likely arranged consecutively in the signaling pathway mediating LTP. (C) 2011 Elsevier B.V. All rights reserved.
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