Deletion of TrkB in adult progenitors alters newborn neuron integration into hippocampal circuits and increases anxiety-like behavior
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New neurons in the adult dentate gyrus are widely held to incorporate into hippocampal circuitry via a stereotypical sequence of morphological and physiological transitions, yet the molecular control over this process remains unclear. We studied the role of brain-derived neurotrophic factor (BDNF)/TrkB signaling in adult neurogenesis by deleting the full-length TrkB via Cre expression within adult progenitors in TrkB(lox/lox) mice. By 4 weeks after deletion, the growth of dendrites and spines is reduced in adult-born neurons demonstrating that TrkB is required to create the basic organization of synaptic connections. Later, when new neurons normally display facilitated synaptic plasticity and become preferentially recruited into functional networks, lack of TrkB results in impaired neurogenesis-dependent long-term potentiation and cell survival becomes compromised. Because of the specific lack of TrkB signaling in recently generated neurons a remarkably increased anxiety-like behavior was observed in mice carrying the mutation, emphasizing the contribution of adult neurogenesis in regulating mood-related behavior.
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Removal of TrkB stunted dendritic growth and adult progenitor integration into the hippocampus in adult mice, leading to more pronounced anxious behavior.
“Removal of TrkB also stunted dendritic growth and adult progenitor integration into the hippocampus in adult mice, which led to more pronounced anxious behavior (Bergami et al., 2008).”
From Exercise-Mediated Neurogenesis in the Hippocampus via BDNF (2018) · cites this paper as Bergami et al., 2008
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“of hippocampal neurogenesis may result in increased anxiety [11,12,13], suggesting that intermediate levels of neurogenesis are”
BackgroundMultiplex quantitative assays indicate a need for reevaluating reported small-molecule TrkB agonists
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Self-citation
- Authors
- Bergami, M., Rimondini, R., Santi, S., Blum, R., Götz, M., & Canossa, M.
- Affiliations
- University of Bologna (IT)
- Istituto Ortopedico Rizzoli (IT)
- Physiologisches Institut (DE)
- Helmholtz Munich (DE)
- Italian Institute of Technology (IT)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2008-10-07
- Volume
- 105
- Issue
- 40
- Pages
- 15570-15575
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC2557028
- OpenAlex
- W2015445474
- Cited by
- 415
- References
- 5
- Citations by year
- 2026: 11 · 2025: 15 · 2024: 12 · 2023: 17 · 2022: 13 · 2021: 18 · 2020: 24 · 2019: 19 · 2018: 16 · 2017: 31 · 2016: 24 · 2015: 26 · 2014: 34 · 2013: 35 · 2012: 34
- FWCI
- 8.75
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
- Iris (University of Trento) (submittedVersion)
- Site cant be reached (submittedVersion)
- Topics
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Keywords
- TrkB, BDNF signaling, adult neurogenesis, dentate gyrus, hippocampal circuitry, synaptic plasticity, long-term potentiation, neuronal survival, anxiety-like behavior, mood regulation
- MeSH terms
- Animals, Anxiety, Dendrites, Hippocampus, Mice, Transgenic, Mutation, Neuronal Plasticity, Neurons, Stem Cells, Dentate Gyrus, Brain-Derived Neurotrophic Factor, Receptor, trkB, Mice
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