Shh Protects the Injured Spinal Cord in Mice by Promoting the Proliferation and Inhibiting the Apoptosis of Nerve Cells via the Gli1-TGF-β1/ERK Axis

Cell Biochem Funct. 2025 Jan;43(1):e70038. doi: 10.1002/cbf.70038.

Abstract

Spinal cord injury (SCI) is a common neurological trauma that cannot be completely cured with surgical techniques and medications. In this study, we established a mouse SCI model and used an adeno-associated virus (AAV) to achieve the high expression of sonic hedgehog (Shh) at the injury site to further investigate the therapeutic effect and mechanism of Shh on SCI. The results of the present study show that Shh may promote motor function recovery. The present findings demonstrate the protective effect of Shh overexpression in SCI by regulating the proliferation and apoptosis of nerve cells at the site of SCI. Shh promotes the proliferation of early microglia, inhibits the proliferation of early astrocytes, and promotes the formation of neurons at the site of injury. In addition, Shh may inhibit apoptosis at the SCI site. The mechanism by which Shh regulates nerve cells at the site of SCI may involve glioma-associated oncogene 1 (Gli1). The present research indicates that Gli1 regulates the transforming growth factor-β (TGF-β) signaling pathway, inhibiting the classic TGF-β1/Smad signaling pathway and activating the TGF-β1/extracellular regulated protein kinase (ERK) signaling pathway. Collectively, these findings suggest that Shh is a regulatory molecule involved in nerve cell proliferation and apoptosis. High Shh expression can accelerate motor function recovery after SCI, indicating that it may be a promising therapeutic approach for SCI.

Keywords: ERK; Gli1; Shh; TGF‐β1; spinal cord injury.

MeSH terms

  • Animals
  • Apoptosis*
  • Cell Proliferation*
  • Disease Models, Animal
  • Extracellular Signal-Regulated MAP Kinases / metabolism
  • Hedgehog Proteins* / metabolism
  • MAP Kinase Signaling System
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Neurons / metabolism
  • Neurons / pathology
  • Signal Transduction
  • Spinal Cord Injuries* / metabolism
  • Spinal Cord Injuries* / pathology
  • Transforming Growth Factor beta1* / metabolism
  • Zinc Finger Protein GLI1* / metabolism

Substances

  • Hedgehog Proteins
  • Zinc Finger Protein GLI1
  • Shh protein, mouse
  • Transforming Growth Factor beta1
  • Gli1 protein, mouse
  • Extracellular Signal-Regulated MAP Kinases