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- Title
Firing Rate Homeostasis Can Occur in the Absence of Neuronal Activity-Regulated Transcription.
- Authors
Tyssowski, Kelsev M.; Letai, Katherine C.; Rendall, Samuel D.; Chao Tan; Nizhnik, Anastasia; Kaeser, Pascal S.; Gray, Jesse M.
- Abstract
Despite dynamic inputs, neuronal circuits maintain relatively stable firing rates over long periods. This maintenance of firing rate, or firing rate homeostasis, is likely mediated by homeostatic mechanisms such as synaptic scaling and regulation of intrinsic excitability. Because some of these homeostatic mechanisms depend on transcription of activity-regulated genes, including Arc and Homer la, we hypothesized that activity-regulated transcription would be required for firing rate homeostasis. Surprisingly, however, we found that cultured mouse cortical neurons from both sexes grown on multi-electrode arrays homeostatically adapt their firing rates to persistent pharmacological stimulation even when activity-regulated transcription is disrupted. Specifically, we observed firing rate homeostasis in Arc knock-out neurons, as well as knock-out neurons lacking the activity-regulated transcription factors API and SRF. Firing rate homeostasis also occurred normally during acute pharmacological blockade of transcription. Thus, firing rate homeostasis in response to increased neuronal activity can occur in the absence of neuronal-activity-regulated transcription.
- Subjects
HOMEOSTASIS; TRANSGENIC organisms; TRANSCRIPTION factors; RATES
- Publication
Journal of Neuroscience, 2019, Vol 39, Issue 50, p9885
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.1108-19.2019