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Updated: Apr 30, 2026

Three-dimensional Tissue Engineered Aligned Astrocyte Networks to Recapitulate Developmental Mechanisms and Facilitate Nervous System Regeneration
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Astrocyte-encoded positional cues maintain sensorimotor circuit integrity.

Anna V Molofsky1, Kevin W Kelley2, Hui-Hsin Tsai3

  • 11] Howard Hughes Medical Institute, University of California San Francisco, San Francisco, California 94143, USA [2] Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California San Francisco, San Francisco, California 94143, USA [3] Department of Psychiatry, University of California San Francisco, San Francisco, California 94143, USA.

Nature
|April 30, 2014
PubMed
Summary
This summary is machine-generated.

Region-specific astrocytes in the spinal cord provide crucial positional cues. Ventral astrocyte-secreted semaphorin 3a (Sema3a) is vital for motor and sensory neuron circuit organization during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Biology

Background:

  • Astrocytes are the most abundant glial cells in the central nervous system (CNS).
  • Astrocytes play roles in synapse formation and neural circuit refinement.
  • Functional heterogeneity of region-restricted astrocytes during development remains largely unknown.

Purpose of the Study:

  • To investigate functional heterogeneity in postnatal spinal cord astrocytes.
  • To determine the role of region-specific astrocyte-derived factors in sensorimotor circuit organization.

Main Methods:

  • Analysis of region-specific gene expression in postnatal spinal cord astrocytes.
  • Investigation of the role of semaphorin 3a (Sema3a) in sensorimotor circuit development.
  • Assessment of motor neuron and sensory neuron circuit organization following Sema3a loss.

Main Results:

  • Postnatal spinal cord astrocytes exhibit region-specific gene expression.
  • Ventral astrocyte-derived Sema3a is essential for correct motor neuron and sensory neuron circuit organization.
  • Loss of astrocyte Sema3a results in abnormal motor neuron axon guidance, synaptic inputs, and selective motor neuron death, alongside ectopic sensory afferent projections.

Conclusions:

  • Developing astrocytes provide stable positional cues that influence sensorimotor circuit formation.
  • Regional astrocyte heterogeneity contributes to the coordination of postnatal neural circuit refinement.
  • Astrocyte-encoded semaphorin 3a is a critical factor in establishing precise sensorimotor circuitry.