Cited by 202Axon Guidance and Neuronal SignalingNeurogenesis and neuroplasticity mechanismsCellular Mechanics and Interactions

Reelin stabilizes the actin cytoskeleton of neuronal processes by inducing n-cofilin phosphorylation at serine3

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Chai, Xuejun, Förster, Eckart, Zhao, Shanting, Bock, Hans H., Frotscher, Michael·2009·The Journal of Neuroscience

Abstract

The extracellular matrix protein Reelin, secreted by Cajal-Retzius cells in the marginal zone of the cortex, controls the radial migration of cortical neurons. Reelin signaling involves the lipoprotein receptors apolipoprotein E receptor 2 (ApoER2) and very low density lipoprotein receptor (VLDLR), the adapter protein Disabled1 (Dab1), and phosphatidylinositol-3-kinase (PI3K). Eventually, Reelin signaling acts on the cytoskeleton; however, these effects on cytoskeletal organization have remained elusive. In Reelin-deficient mutant mice, most cortical neurons are unable to migrate to their destinations, suggesting a role for Reelin signaling in the dynamic cytoskeletal reorganization that is required for neurons to migrate. Here, we show that Reelin signaling leads to serine3 phosphorylation of n-cofilin, an actin-depolymerizing protein that promotes the disassembly of F-actin. Phosphorylation at serine3 renders n-cofilin unable to depolymerize F-actin, thereby stabilizing the cytoskeleton. We provide evidence for ApoER2, Dab1, Src family kinases (SFKs), and PI3K to be involved in n-cofilin serine3 phosphorylation. Phosphorylation of n-cofilin takes place in the leading processes of migrating neurons as they approach the Reelin-containing marginal zone. Immunostaining for phospho-cofilin in dissociated reeler neurons is significantly increased after incubation in Reelin-containing medium compared with control medium. In a stripe choice assay, neuronal processes are stable on Reelin-coated stripes but grow on control stripes by forming lamellipodia. These novel findings suggest that Reelin-induced stabilization of neuronal processes anchors them to the marginal zone which appears to be required for the directional migration process.

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Crossref · 10.1523/jneurosci.2934-08.2009

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  • Reelin binding to ApoER2 induces binding of Dab1 to its cytoplasmic NPxY motif, resulting in phosphorylation of specific tyrosines, PI3K activation, and n-cofilin phosphorylation in leading processes of migrating neurons.

    “Reelin binding to ApoER2 induces binding of the adaptor protein Dab1 to its cytoplasmic NPxY motif [10], [11], resulting in the phosphorylation of specific tyrosines [12], [13], PI3K activation, and n-cofilin phosphorylation in the leading processes of migrating neurons [9], [14].”

    From Sorting nexin 17 regulates ApoER2 recycling and reelin signaling (2014) · cites this paper as [14]

    The Abstract reports Reelin-induced n-cofilin phosphorylation in the leading processes of migrating neurons. The section ‘Reelin-induced n-cofilin serine3 phosphorylation is mediated by Dab1, SFKs and PI3K’ reports that PI3K inhibition reduces this phosphorylation, but does not establish the separately stated step of PI3K activation. The NPxY-motif and specific-tyrosine clauses have separate citations in the citing sentence and are not assessed against this source. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Activation of apoE receptor family member, LRP8/ApoER2, inhibits the function of n-cofilin and this subsequently leads to stabilization of actin filaments.

    “one study demonstrated that activation of apoE receptor family member, LRP8/ApoER2, inhibits the function of n-cofilin and this subsequently leads to stabilization of actin filaments (Chai et al., 2009) (Fig. 2).”
  • Actin polymerization and dendritic spine growth exhibit a net increase in the presence of Reelin, and mice that overexpress Reelin have higher spine density and increased spine complexity.

    “actin polymerization and dendritic spine growth exhibit a net increase in the presence of Reelin, and mice that overexpress Reelin have higher spine density and increased spine complexity [64, 65].”

    From ApoE, ApoE Receptors, and the Synapse in Alzheimer's Disease (2017) · cites this paper as [64]

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Authors
Chai, X., Förster, E., Zhao, S., Bock, H. H., & Frotscher, M.
Affiliations
  • University of Freiburg (DE)
  • Universität Hamburg (DE)
Corresponding author
Frotscher, Michael
Venue
The Journal of Neuroscience
Published
2009-01-07
Volume
29
Issue
1
Pages
288-299
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2117547988
Cited by
202
References
72
Citations by year
2026: 3 · 2025: 2 · 2024: 5 · 2023: 8 · 2022: 11 · 2021: 10 · 2020: 11 · 2019: 7 · 2018: 10 · 2017: 15 · 2016: 13 · 2015: 8 · 2014: 23 · 2013: 12 · 2012: 16
FWCI
8.84
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft (FO 223/6-1, SFB 592)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Axon Guidance and Neuronal Signaling
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
Keywords
reelin, neuronal migration, radial migration, cortical neurons, ApoER2, VLDLR, phosphatidylinositol 3-kinase, Src family kinases, F-actin depolymerization, lamellipodia, reeler mice
MeSH terms
Reelin Protein, Actins, Animals, Cell Movement, Cells, Cultured, Cerebral Cortex, Embryo, Mammalian, Enzyme Inhibitors, Humans, Mice, Neurologic Mutants, Mice, Transgenic, Mutation, Nerve Tissue Proteins, Neurons, Phosphorylation, Receptors, Cell Surface, Receptors, LDL, Serine, Serine Endopeptidases, Subcellular Fractions, Transfection, Down-Regulation, Cell Adhesion Molecules, Neuronal, Extracellular Matrix Proteins, Receptors, Lipoprotein, src-Family Kinases, Phosphatidylinositol 3-Kinases, LDL-Receptor Related Proteins, Cofilin 1, Mice, Lim Kinases

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