Role of glutamate δ-2 receptors in activity-dependent competition between heterologous afferent fibers
| Autor: | Roberta Rasetti, Piergiorgio Strata, Robin J. Harvey, Laura Morando, Roberta Cesa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
musculoskeletal diseases
Cerebellum Dendritic spine Models Neurological Cerebellar Purkinje cell Nerve Tissue Proteins Tetrodotoxin Biology Neurotransmission Synaptic Transmission Synapse Purkinje Cells medicine Animals Neurons Afferent Rats Wistar Long-term depression Nerve Endings Multidisciplinary Glutamate receptor Nerve Block Anatomy Dendrites Biological Sciences Rats Microscopy Electron medicine.anatomical_structure Receptors Glutamate Excitatory postsynaptic potential Neuroscience |
| Popis: | A principle that regulates detailed architecture in the brain is that active terminals have a competitive advantage over less active terminals in establishing synaptic connections. This principle is known to apply to fibers within a single neuronal population competing for a common target domain. Here we uncover an additional rule that applies when two neuronal populations compete for two contiguous territories. The cerebellar Purkinje cell dendrites have two different synaptic domains with spines innervated by two separate excitatory inputs, parallel fibers (PFs) and climbing fibers (CFs). Glutamate δ-2 receptors are normally present only on the PF spines where they are important for their innervation. After block of activity by tetrodotoxin, numerous new spines form in the CF domain and become innervated mainly by PFs; all spines, including those still innervated by the CFs, bear δ-2 receptors. Thus, in the absence of activity, PFs gain a competitive advantage over CFs. The entire dendritic arbor becomes a uniform territory with the molecular cues associated with the PFs. To access their proper territory and maintain synaptic contacts, CFs must be active and locally repress the cues of the competitor afferents. |
| Databáze: | OpenAIRE |
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