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Rac1 Guides Porf-2 to Wnt Pathway to Mediate Neural Stem Cell Proliferation

Xi-Tao Yang1,2,3, Guo-Hui Huang1,2, Hong-Jiang Li1,2

  • 1Department of Neurosurgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of MedicineShanghai, China.

Frontiers in Molecular Neuroscience
|June 20, 2017
PubMed

Insights

Preoptic regulator factor 2 (Porf-2) inhibits neural stem cell (NSC) proliferation by blocking the Rac1-Wnt/β-catenin pathway. Targeting Porf-2 may aid recovery from optic nerve injury.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Regenerative Medicine

Background:

  • The anti-proliferative mechanisms of preoptic regulator factor 2 (Porf-2) on neural stem cells (NSCs) are not well understood.
  • Understanding these mechanisms is crucial for developing therapeutic strategies for neural repair.

Purpose of the Study:

  • To elucidate the molecular and cellular pathways through which Porf-2 regulates NSC proliferation.
  • To investigate the potential of targeting Porf-2 for optic nerve injury recovery.

Main Methods:

  • Investigated Porf-2's effect on ras-related C3 botulinum toxin substrate 1 (Rac1) activity in rat NSCs.
  • Assessed the impact of Rac1 and Wnt signaling modulation on NSC proliferation.
  • Utilized a rat optic nerve crush model to evaluate functional recovery and NSC proliferation.

Main Results:

  • Porf-2 inhibits NSC proliferation by suppressing Rac1 activity, which impairs β-catenin nuclear translocation.
  • Porf-2 knockdown increased NSC proliferation, while its overexpression decreased it, effects modulated by Rac1 and Wnt signaling.
  • Porf-2 knockdown improved visual function recovery in an optic nerve crush model, associated with increased Wnt3a expression.

Conclusions:

  • Porf-2 inhibits NSC proliferation through the Rac1-Wnt/β-catenin signaling pathway.
  • Porf-2 represents a potential therapeutic target for promoting recovery after optic nerve injury.
Keywords:
Porf-2RhoGAPsWnt/β-catenin pathwayneural stem cellsoptic nerve injury

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