Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 40, Pages 16336-16341Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1202818109
Keywords
calcium signaling; spinal interneuron; mitogen-activated protein kinase; noggin; activity-dependent neuronal specification
Categories
Funding
- Klingenstein Foundation Award in Neuroscience
- Basil O'Connor Award [5-FY09-131]
- March of Dimes
- National Science Foundation [1120796]
- National Institutes of Health-National Institute of Neurological Disorders and Stroke [R01NS073055]
- Shriners Hospital for Children [86500-NCA]
- Shriners Hospital for Children Postdoctoral Fellowship
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1120796] Funding Source: National Science Foundation
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A gradient of bone morphogenetic proteins (BMPs) along the dorsoventral axis of the spinal cord is necessary for the specification of dorsal neurons. Concurrently, a gradient of calcium-mediated electrical activity is present in the developing spinal cord but in an opposing ventrodorsal direction. Whether BMPs and electrical activity interact in embryonic spinal neurons remains unknown. We show that BMP decreases electrical activity by enhancing p38 MAPK-mediated negative modulation of voltage-gated sodium channels. In turn, electrical activity affects the phosphorylation status and nuclear level of activated Smads, the canonical components of BMP signaling. This interaction between calcium spike activity and BMP signaling regulates the specification of the dorsal commissural spinal neuron phenotype. The present study identifies an unexpected interplay between BMPs and electrical activity that is critical for decoding the morphogen gradient during spinal neuron differentiation.
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