Cited by 246Axon Guidance and Neuronal SignalingStroke Rehabilitation and RecoveryNerve injury and regeneration

A role for ephrin-A5 in axonal sprouting, recovery, and activity-dependent plasticity after stroke

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Overman, Justine J., Clarkson, Andrew N., Wanner, Ina B., Overman, William T., Eckstein, Ilya, Maguire, Jaime L., Dinov, Ivo D., Toga, Arthur W. +1 more·2012·Proceedings of the National Academy of Sciences

Abstract

Stroke causes loss of neurological function. Recovery after stroke is facilitated by forced use of the affected limb and is associated with sprouting of new connections, a process that is sharply confined in the adult brain. We show that ephrin-A5 is induced in reactive astrocytes in periinfarct cortex and is an inhibitor of axonal sprouting and motor recovery in stroke. Blockade of ephrin-A5 signaling using a unique tissue delivery system induces the formation of a new pattern of axonal projections in motor, premotor, and prefrontal circuits and mediates recovery after stroke in the mouse through these new projections. Combined blockade of ephrin-A5 and forced use of the affected limb promote new and surprisingly widespread axonal projections within the entire cortical hemisphere ipsilateral to the stroke. These data indicate that stroke activates a newly described membrane-bound astrocyte growth inhibitor to limit neuroplasticity, activity-dependent axonal sprouting, and recovery in the adult.

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Registry

Crossref · 10.1073/pnas.1204386109

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  • These new connections are causally associated with functional recovery.

    “These new connections are causally associated with functional recovery4.”
  • Stroke induces axonal sprouting and the formation of new connections in peri-infarct cortex that link premotor, motor, somatosensory and association areas.

    “Stroke induces axonal sprouting and the formation of new connections in peri-infarct cortex that link premotor, motor, somatosensory and association areas1–4.”
  • In rodent and primate models of stroke, axonal sprouting and the formation of new connections occurs in motor, somatosensory and premotor areas.

    “In rodent and primate models of stroke, axonal sprouting and the formation of new connections occurs in motor, somatosensory and premotor areas1–4.”
  • GDF10 gain and loss of function was produced directly from the stroke through sustained release via biopolymer hydrogel, which produces release over 2-3 weeks from the stroke site without altering local inflammation, gliosis, neuronal or vascular structure.

    “To test this hypothesis, GDF10 gain and loss of function was produced directly from the stroke through sustained release via biopolymer hydrogel, which produces release over 2–3 weeks from the stroke site3,4,28 without altering local inflammation, gliosis, neuronal or vascular structure4.”
  • Stroke alone modestly but significantly induces axonal sprouting in the motor cortex adjacent to the stroke site compared to normal motor system connections.

    “As reported previously3,4,28,29, stroke alone modestly but significantly induces axonal sprouting in the motor cortex adjacent to the stroke site compared to normal motor system connections (Supplementary Fig. 6b).”

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Authors
Overman, J. J., Clarkson, A. N., Wanner, I. B., Overman, W. T., Eckstein, I., Maguire, J. L., Dinov, I. D., Toga, A. W., & Carmichael, S. T.
Affiliations
  • Department of Neurology, David Geffen School of Medicine, and
  • University of Otago (NZ)
  • University of California, Los Angeles (US)
  • Tufts University (US)
Venue
Proceedings of the National Academy of Sciences
Published
2012-07-25
Volume
109
Issue
33
Pages
E2230-9
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2134115573
Cited by
245
References
51
Citations by year
2026: 6 · 2025: 9 · 2024: 11 · 2023: 24 · 2022: 17 · 2021: 22 · 2020: 23 · 2019: 23 · 2018: 17 · 2017: 19 · 2016: 17 · 2015: 19 · 2014: 17 · 2013: 18 · 2012: 3
FWCI
7.51
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1f31ns061530-01)
  • National Institute of Nursing Research (K99NR010797)
  • National Institute of Neurological Disorders and Stroke (NS049041, R01NS045729, NS045729, NS061530-02, R01NS049041)
  • National Center for Research Resources (RR021813, U54RR021813)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Axon Guidance and Neuronal Signaling
  • Health Sciences › Medicine › Rehabilitation › Stroke Rehabilitation and Recovery
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nerve injury and regeneration
Keywords
ephrin-A5, axonal sprouting, stroke recovery, motor recovery, reactive astrocytes, activity-dependent plasticity, neuroplasticity, prefrontal cortex, premotor cortex
MeSH terms
Animals, Astrocytes, Axons, Behavior, Animal, Cerebral Cortex, Mice, Inbred C57BL, Motor Activity, Nerve Net, Neuronal Plasticity, Phosphorylation, Staining and Labeling, Signal Transduction, Recovery of Function, Stroke, Ephrin-A5, Mice

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