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August 27, 2003Journal of NeuroscienceOpen Access

Ephrin-B2 and EphB2 Regulation of Astrocyte-Meningeal Fibroblast Interactions in Response to Spinal Cord Lesions in Adult Rats

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Authors

LBLiza Q. BundesenGeorgetown UniversityTST. ScheelGeorgetown UniversityBBBarbara S. BregmanMedStar National Rehabilitation Hospital

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Implication

Experimental study reveals bidirectional ephrin-B2 and EphB2 signaling regulates astrocyte-fibroblast segregation in adult rats, indicating a key mechanism driving glial scar formation.

Key Points

  • To examine whether contact-mediated signaling between ephrin-B2 and EphB2 regulates interactions between astrocytes and meningeal fibroblasts following spinal cord injury in the adult central nervous system.
  • Adult rats received thoracic spinal cord transection lesions.
  • Histological, biochemical, and immunohistochemical analyses evaluated ephrin-B2 and EphB2 expression and phosphorylation across days 1, 3, 7, and 14 post-lesion.
  • Ephrin-B2 was expressed by reactive astrocytes and EphB2 by invading meningeal fibroblasts, with both protein levels decreasing at day 1 before significantly increasing by day 14.
  • Cell intermingling and bidirectional phosphorylation of ephrin-B2 and EphB2 occurred during the first 3 days after spinal cord injury.
  • By day 14, astrocytes and meningeal fibroblasts formed segregated cellular domains to complete glial scar maturation, concurrent with diminished ephrin-B2 and EphB2 phosphorylation.

Cite This Study

Bundesen et al. (2003) studied this question.

synapsesocial.com/papers/69d8939018b0ca7f91d18396https://doi.org/10.1523/jneurosci.23-21-07789.2003
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Also Consider

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