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TrkB dimerization during development of the prefrontal cortex of the macaque
K Ohira1, K Shimizu, M Hayashi
1Department of Cellular and Molecular Biology, Primate Research Institute, Kyoto University, Kanrin, Inuyama, Aichi, Japan.
Journal of Neuroscience Research
|September 6, 2001
Summary
Brain-derived neurotrophic factor (BDNF) receptor TrkB subtypes exhibit developmental changes in dimerization within the monkey prefrontal cortex. These dimerization patterns, influenced by BDNF concentration and specific neurotrophins, suggest a role in neural development.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Two subtypes of TrkB, a receptor for BDNF, exist: full-length (TK+) with a tyrosine kinase domain and truncated (TK-) lacking this domain.
- TrkB receptor function is crucial for neuronal development and plasticity, but its subtype-specific dimerization during development is not fully understood.
Purpose of the Study:
- To investigate the dimerization patterns of TrkB subtypes (TK+ and TK-) in the developing monkey prefrontal cortex.
- To determine the influence of BDNF concentration and other neurotrophins on TrkB dimerization.
Main Methods:
- Utilized cross-linking techniques to study TrkB subtype dimerization in monkey prefrontal cortex at different developmental stages (embryonic, newborn, adult).
- Stimulated TrkB receptors with BDNF and other neurotrophins (NT-4/5, NT-3, NGF) and assessed dimer formation.
- Investigated the role of BDNF by using anti-BDNF antibody and examined intercellular binding proteins.
Main Results:
- TrkB dimerization patterns changed significantly across developmental stages: TK+/TK+ and homodimers observed at embryonic and newborn stages, while TK-/TK- homodimers and TK+/TK- heterodimers formed in adults.
- Dimer formation was dose-dependent on BDNF concentration and rapid, occurring within 5 minutes of stimulation.
- BDNF and NT-4/5 effectively induced dimerization, NT-3 showed minimal induction, and NGF did not induce dimerization. Anti-BDNF antibody inhibited dimerization.
Conclusions:
- TrkB subtype dimerization undergoes dynamic changes during the development of the monkey prefrontal cortex.
- These developmental shifts in TrkB dimerization are regulated by BDNF and specific neurotrophins, suggesting a critical role in cortical development.