The expression mechanism of the residual LTP in the CA1 region of BDNF k.o. mice is insensitive to NO synthase inhibition

6533b862fe1ef96bd12c6427

RESEARCH PRODUCT

The expression mechanism of the residual LTP in the CA1 region of BDNF k.o. mice is insensitive to NO synthase inhibition

Sigrid Stroh-kaffei Werner Kilb Elke Edelmann Tanja Brigadski Tanja Brigadski Violetta Steinbrecher Volkmar Leßmann Volkmar Leßmann Heiko J. Luhmann

subject

Long-Term Potentiation Biophysics Tropomyosin receptor kinase B In Vitro Techniques Biology Nitric oxide Mice chemistry.chemical_compound medicine Animals Enzyme Inhibitors CA1 Region Hippocampal Molecular Biology Mice Knockout Brain-derived neurotrophic factor Brain-Derived Neurotrophic Factor musculoskeletal neural and ocular physiology General Neuroscience Excitatory Postsynaptic Potentials Long-term potentiation Electric Stimulation Cell biology Mice Inbred C57BL NG-Nitroarginine Methyl Ester Synaptic fatigue medicine.anatomical_structure Animals Newborn nervous system chemistry Schaffer collateral Synaptic plasticity Retrograde signaling Neurology (clinical)Nitric Oxide Synthase Neuroscience Developmental Biology

description

Abstract 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 μM) 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.

year	journal	country	edition	language
2011-05-01	Brain Research

https://doi.org/10.1016/j.brainres.2011.03.061