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Brain Structure and Function

, Volume 223, Issue 8, pp 3689–3709 | Cite as

Cell type-specific effects of BDNF in modulating dendritic architecture of hippocampal neurons

  • Marta ZagrebelskyEmail author
  • N. Gödecke
  • A. Remus
  • Martin KorteEmail author
Original Article

Abstract

Brain-derived neurotrophin factor (BDNF) has been implicated in neuronal survival, differentiation and activity-dependent synaptic plasticity in the central nervous system. It was suggested that during postnatal development BDNF regulates neuronal architecture and spine morphology of neurons within certain brain areas but not others. Particularly striking are the differences between striatum, cortex and hippocampus. Whether this is due to region- or cell type-specific effects is so far not known. We address this question using conditional bdnf knock-out mice to analyze neuronal architecture and spine morphology of pyramidal cortical and hippocampal neurons as well as inhibitory neurons from these brain areas and excitatory granule neurons from the dentate gyrus. While hippocampal and cortical inhibitory neurons and granule cells of the dentate gyrus are strongly impaired in their architecture, pyramidal neurons within the same brain regions only show a mild phenotype. We found a reduced TrkB phosphorylation within hippocampal interneurons and granule cells of the dentate gyrus, accompanied by a significant decrease in dendritic complexity. In contrast, in pyramidal neurons both TrkB phosphorylation and neuronal architecture are not altered. The results suggest diverse levels of responsiveness to BDNF for different hippocampal and cortical neuronal populations within the same brain area. Among the possible mechanisms mediating these differences in BDNF function, we tested whether zinc might be involved in TrkB transactivation specifically in pyramidal neurons. We propose that a BDNF-independent transactivation of TrkB receptor may be able to compensate the lack of BDNF signaling to modulate neuronal morphology in a cell type-specific manner.

Keywords

Dendrites Spines Structural plasticity Hippocampus TrkB Zinc 

Notes

Acknowledgements

We are grateful to Diane Mundil, Tania Meßerschmidt and Heike Kessler for their excellent technical assistance and to Martin Rothkegel for experimental advice. This work was supported by the DFG Grant KO 1674/5-1 (to M.K. and M.Z.).

Supplementary material

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Supplementary material 1 (EPS 1521 KB)
429_2018_1715_MOESM2_ESM.eps (1 mb)
Supplementary material 2 (EPS 1026 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Cellular Neurobiology, Zoological InstituteTU BraunschweigBrunswickGermany
  2. 2.Helmholtz Centre for Infection ResearchAG NINDBrunswickGermany

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