Journal
JOURNAL OF NEUROSCIENCE
Volume 34, Issue 2, Pages 392-407Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1328-13.2014
Keywords
activity-regulated; dendrite; Rem2
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Funding
- Alfred P. Sloan Foundation
- Richard and Susan Smith Family Foundation
- National Institutes of Health (NIH) [R01NS065856, F31DA032181, T32NS07292, R01DA033610, P30NS069339, P30NS45713]
- Searle Scholar Foundation
- Massachusetts Life Sciences Center
- Charles H. Hood Foundation
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A key feature of the CNS is structural plasticity, the ability of neurons to alter their morphology and connectivity in response to sensory experience and other changes in the environment. How this structural plasticity is achieved at the molecular level is not well understood. We provide evidence that changes in sensory experience simultaneously trigger multiple signaling pathways that either promote or restrict growth of the dendritic arbor; structural plasticity is achieved through a balance of these opposing signals. Specifically, we have uncovered a novel, activity-dependent signaling pathway that restricts dendritic arborization. We demonstrate that the GTPase Rem2 is regulated at the transcriptional level by calcium influx through L-VGCCs and inhibits dendritic arborization in cultured rat cortical neurons and in the Xenopus laevis tadpole visual system. Thus, our results demonstrate that changes in neuronal activity initiate competing signaling pathways that positively and negatively regulate the growth of the dendritic arbor. It is the balance of these opposing signals that leads to proper dendritic morphology.
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