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Changing subcellular distribution and activity-dependent utilization of a dendritically localized mRNA in developing
I Wanner1, S L Baader, J Oberdick
1Abteilung Anatomie und Zellbiologie, Universität Ulm, Ulm, Germany.
Insights
Neuronal activity influences the localization and expression of L7/pcp-2 mRNA in cerebellar Purkinje neurons. This activity-driven process impacts neuronal development and synaptic plasticity.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Dendritic segregation of L7/pcp-2 mRNA in Purkinje neurons correlates with development and synaptic connections.
- This developmental pattern is reproducible in cultured Purkinje cells.
Purpose of the Study:
- To investigate the impact of neuronal activity on L7/pcp-2 mRNA localization and expression in Purkinje cells.
- To determine if activity-dependent changes affect other neuronal components like calbindin D28k.
Main Methods:
- Primary dissociated cultures of Purkinje cells were used.
- Stimulation involved potassium-induced depolarization and GABAergic input blockade.
- Analysis focused on L7/pcp-2 mRNA and protein levels, and calbindin D28k mRNA and protein.
Main Results:
- Short-term stimulation increased L7/pcp-2 mRNA-positive dendrites and L7 protein levels via posttranscriptional mechanisms.
- Calbindin D28k mRNA localization and protein levels remained unaffected by treatments.
- Prolonged stimulation led to significant changes in Purkinje cell dendritic morphology.
Conclusions:
- Activity-driven translation of segregated mRNAs contributes to neuronal plasticity.
- This mechanism plays a role in the developmental and functional adaptability of nerve cells.
Abstract:
In cerebellar Purkinje neurons, the degree of dendritic segregation of the Purkinje cell-specific mRNA L7/pcp-2 is correlated with their development and synaptic investment. This developmental pattern is also observed in Purkinje cells in primary dissociated culture. Short-term (12-48 h) stimulation of cultured Purkinje cells by potassium-induced depolarization or blockade of their inhibitory GABAergic input results in an increased incidence of Purkinje cells with L7/pcp-2 mRNA-positive dendrites and increased levels of L7 protein expression, the latter by a posttranscriptional mechanism. None of these treatments affected the localization of the mRNA encoding calbindin D28k nor the level of this protein in Purkinje neurons. Protracted exposure to depolarizing levels of potassium or elimination of GABAergic transmission resulted in conspicuous changes of Purkinje cell dendritic morphology. These data suggest a scenario in which activity-driven translation of subcellularly segregated mRNAs may contribute to the developmental and functional plasticity of nerve cells.